485BPOS

The Securities and Exchange Commission (the “SEC”) has not approved or disapproved these securities or determined if this Prospectus is truthful and complete. Any representation to the contrary is a criminal offense.

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Expense Example: This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 257% of the average value of its portfolio.

The Fund uses a growth style of investment in equity securities, including common and preferred stocks, American Depositary Receipts and Global Depositary Receipts, and under normal market conditions, invests substantially all (no less than 80%) of its net assets (plus the amount of borrowings for investment purposes) in emerging markets companies. There are no specific limitations on the percentage of assets that may be invested in securities of issuers located in any one country at a given time; the Fund may invest significant assets in any single emerging market country. The Fund may invest in companies with limited operating histories. The Fund will invest in a relatively low number of issuers, making it a nondiversified fund. The Fund frequently and actively trades its portfolio securities. Investment decisions for the Fund’s growth style of investing are based on the determination that a company’s revenue and earnings growth can materially exceed market expectations and that the security is at an attractive entry point. This decision involves evaluating fundamental factors, including the company’s business model, the competitive landscape, upcoming product introductions and recent and projected financial metrics. The decision is also based on the evaluation of technical or market factors, including price and volume trends, relative strength and institutional

interest. To a lesser extent, the Fund’s investment adviser also utilizes macroeconomic or country-specific analyses to evaluate the sustainability of a company’s growth rate. The Fund sells holdings for a variety of reasons, including the deterioration of the earnings profile, the violation of specific technical thresholds, to shift into securities with more compelling risk/reward characteristics or to alter sector or country exposure.

All investments, including those in mutual funds, have risks. No investment is suitable for all investors. The Fund is intended for long-term investors who can accept the risks involved in investing in foreign securities. Of course, there can be no assurance that the Fund will achieve its objective. You may lose money by investing in the Fund. Below are the main risks of investing in the Fund:

Market Risk. The Fund is subject to market risk, which is the possibility that stock prices overall will decline over short or long periods. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. These fluctuations are expected to have a substantial influence on the value of the Fund’s shares.

Growth Stock Risk. Growth stocks are typically priced higher than other stocks, in relation to earnings and other measures, because investors believe they have more growth potential. This potential may or may not be realized and, if it is not realized, may result in a loss to the Fund. Growth stock prices also tend to be more volatile than the overall market.

Foreign Securities and Currencies Risk. The Fund invests in foreign securities. Investing outside the U.S. involves different risks than domestic investments. The following risks may be associated with foreign investments: less liquidity; greater volatility; political instability; restrictions on foreign investment and repatriation of capital; less complete and reliable information about foreign companies; reduced government supervision of some foreign securities markets; lower responsiveness of foreign management to shareholder concerns; economic issues or developments in foreign countries; fluctuation in exchange rates of foreign currencies and risks of devaluation; imposition of foreign withholding and other taxes; dependence of emerging market companies upon commodities which may be subject to economic cycles; and emerging market risk such as limited trading volume, expropriation, devaluation or other adverse political or social developments.

To the extent portfolio securities are issued by foreign issuers or denominated in foreign currencies, the Fund’s investment performance is affected by the strength or weakness of the U.S. dollar against these currencies. Generally, an increase in the value of the U.S. dollar against a foreign currency will reduce the value of a security denominated in that foreign currency, thereby decreasing the Fund’s overall net asset value. Currency rates in foreign countries may fluctuate significantly over short or long periods of time for a number of reasons, including changes in interest rates, imposition of currency controls and economic or political developments in the U.S. or abroad.

Emerging Market Risk. The Fund invests primarily in emerging markets and therefore, the risks described above for foreign securities are typically increased. Investments in securities of issuers located in such countries are speculative and subject to certain special risks. The small size, limited trading volume and relative inexperience of the securities markets in these countries may make the Fund’s investments in such countries illiquid and more volatile than investments in more developed countries, and the Fund may be required to establish special custodial or other arrangements before making investments in these countries. There may be little financial or accounting information available with respect to issuers located in these countries, and it may be difficult as a result to assess the value or prospects of an investment in such issuers.

Small- and Medium-Sized Company Risk. The Fund invests in companies that are smaller, less established, with less liquid markets for their stock, and therefore may be riskier investments. While small- and medium-sized companies generally have the potential for rapid growth, the securities of these companies often involve greater risks than investments in larger, more established companies because small- and medium-sized companies may lack the management experience, financial resources, product diversification and competitive strengths of larger companies. In addition, in many instances the securities of small- and medium-sized companies are traded only over-the-counter or on a regional securities exchange, and the frequency and volume of their trading is substantially less than is typical of larger companies. The value of securities of smaller, less well known issuers can be more volatile than that of larger issuers.

Nondiversification. Because the Fund may invest a greater percentage of assets in a particular issuer or a small number of issuers, it may be subject to greater risks and larger losses than diversified funds. The value of the Fund may vary more as a result of changes in the financial condition or the market’s assessment of the issuers than a more diversified fund.

Allocation Risk. The Fund’s overall risk level will depend on the countries and market sectors in which the Fund is invested. Because the Fund may have significant weightings in a particular company, country, industry or market sector, the value of Fund shares may be affected by events that adversely affect that company, country, industry or market sector and may fluctuate more than that of a less focused fund.

Manager Risk. How the Fund’s investment adviser manages the Fund will impact the Fund’s performance. The Fund may lose money if the investment adviser’s investment strategy does not achieve the Fund’s objective or the investment adviser does not implement the strategy successfully.

The bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows the volatility — or variability — of the Fund’s annual total returns over time, and shows that Fund performance can change from year to year. The table shows the Fund’s average annual total returns for certain time periods compared to the returns of two broad-based securities indices. Of course, the Fund’s past performance (before and after taxes) is not necessarily an indication of its future performance. Updated performance information is available by visiting www.driehaus.com or by calling 1-800-560-6111.

During the periods shown in the bar chart, the highest return for a quarter was 31.39% (quarter ended 6/30/09) and the lowest return for a quarter was –30.71% (quarter ended 9/30/08).

The table shows returns on a before-tax and after-tax basis. After-tax returns are calculated using the highest historic marginal individual federal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown in the table. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).

In general, you can buy or sell shares of the Fund by mail at Driehaus Mutual Funds, P.O. Box 9817, Providence, RI 02940, for regular mail or Driehaus Mutual Funds, 4400 Computer Drive, Westborough, MA 01581-1722, for overnight delivery or by phone at 1-800-560-6111 on any business day. You may also buy and sell shares through a financial professional.

The Fund’s distributions may be taxable as ordinary income or capital gains, unless you are investing through a tax-advantaged arrangement, such as a 401(k) or an IRA. If you are investing through a 401(k) plan, assets held through such plan may be taxable upon withdrawal.

If you purchase the Fund through a broker-dealer or other financial intermediary (such as a bank), the Fund’s related companies may pay the intermediary for the sale of Fund shares and related services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your financial intermediary’s web site for more information.

Driehaus Emerging Markets Small Cap Growth Fund seeks to maximize capital appreciation.

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

The Fund uses a growth style of investment in equity securities, including common and preferred stocks, American Depositary Receipts and Global Depositary Receipts, and in equity-convertible securities, such as warrants, rights and options. Under normal market conditions, the Fund invests substantially all (no less than 80%) of its net assets (plus the amount of borrowings for investment purposes) in small capitalization emerging markets companies. For purposes of the Fund, the investment adviser currently considers a company to be a small capitalization company if it is within the same market capitalization range at the time of investment as those included in the MSCI Emerging Markets Small Cap Index. As of the date of this Prospectus, 100% of the MSCI Emerging Markets Small Cap Index consisted of companies with a market capitalization of less than $4 billion. The Fund will provide shareholders 60 days’ prior written notice of a change in the Fund’s non-fundamental policy of investing at least 80% of its net assets in small capitalization emerging markets companies. The Fund’s investments in options on emerging markets company stocks and emerging markets exchange-traded funds will be counted toward its policy to invest at least 80% of its net assets in small cap emerging markets companies under normal market conditions. There are no specific limitations on the

percentage of assets that may be invested in securities of issuers located in any one country at a given time; the Fund may invest significant assets in any single emerging market country. The Fund may invest in companies with limited operating histories. The Fund may purchase or write options on equity securities, exchange-traded funds and other similar securities as well as on futures and foreign currencies. The Fund may also engage in short sale transactions. The primary purpose of these activities is to hedge exposures within the Fund’s portfolio but the Fund may also do so speculatively for purposes of profiting from the movements of underlying securities. In seeking to achieve its desired investment objective, the Fund may invest in deliverable and non-deliverable foreign currency forwards, sovereign debt, credit default swaps, and interest rate swaps. The Fund will invest in a relatively low number of issuers, making it a nondiversified fund. The Fund frequently and actively trades its portfolio securities. Investment decisions for the Fund’s growth style of investing are based on the determination that a company’s revenue and earnings growth can materially exceed market expectations and that the security is at an attractive entry point. This decision involves evaluating fundamental factors, including the company’s business model, the competitive landscape, upcoming product introductions and recent and projected financial metrics. The decision is also based on the evaluation of technical or market factors, including price and volume trends, relative strength and institutional interest. To a lesser extent, the Fund’s investment adviser also utilizes macroeconomic or country-specific analyses to evaluate the sustainability of a company’s growth rate. The Fund sells holdings for a variety of reasons, including the deterioration of the earnings profile, the violation of specific technical thresholds, to shift into securities with more compelling risk/reward characteristics or to alter sector or country exposure.

Foreign Securities and Currencies Risk. The Fund invests in foreign securities. Investing outside the U.S. involves different risks than domestic investments. The following risks may be associated with foreign investments: less liquidity; greater volatility; political instability; restrictions on foreign investment and repatriation of capital; less complete and reliable information about foreign companies; reduced government supervision of some foreign securities markets; lower responsiveness of foreign management to shareholder concerns; economic issues or developments in foreign countries; fluctuation in exchange rates of foreign currencies and risks of devaluation; imposition of foreign withholding and other taxes; dependence of emerging market companies upon commodities which may be subject to economic cycles; and emerging market risk such as limited trading volume, illiquidity, expropriation, devaluation or other adverse political or social developments.

investments in more developed countries, and the Fund may be required to establish special custodial or other arrangements before making investments in these countries. There may be little financial or accounting information available with respect to issuers located in these countries, and it may be difficult as a result to assess the value or prospects of an investment in such issuers.

Short Sale Risk. Short sales expose the Fund to the risk that it will be required to buy the security sold short (also known as “covering” the short position) at a time when the security has appreciated in value, thus resulting in a loss to the Fund. The amount the Fund could lose on a short sale is theoretically unlimited (as compared to a long position, where the maximum loss is the amount invested). The use of short sales may also cause the Fund to have higher expenses than those of other funds.

Deliverable and Non-Deliverable Foreign Currency Forwards and Options Risk. Deliverable and non-deliverable foreign currency forward and options contracts involve the risk that anticipated currency movements will not be accurately predicted, which could result in losses on those contracts and additional transaction costs. The use of forward and options contracts could reduce performance if there are unanticipated changes in currency prices. Options on foreign currencies are affected by the factors that influence foreign exchange rates and investments generally. The Fund’s ability to establish and close out positions on foreign currency options is subject to the maintenance of a liquid secondary market, and there can be no assurance that a liquid secondary market will exist for a particular option at any specific time.

position at an advantageous time or price, which may result in significant losses. As a result of the Dodd-Frank Act, certain swap agreements may be cleared through a clearinghouse and traded on an exchange or swap execution facility. The regulation of swaps markets has increased over the last few years, and future regulation of the swaps markets may make swaps more costly, may limit the availability of swaps, or may otherwise adversely affect the value or performance of swaps. Any such adverse future developments could impair the effectiveness of the Fund’s swaps transactions and cause the Fund to lose value.

High Rates of Turnover. It is anticipated that the Fund will experience high rates of portfolio turnover, which may result in payment by the Fund of above-average transaction costs and could result in the payment by shareholders of taxes on above-average amounts of realized investment gains, including net short-term capital gains, which are taxed as ordinary income for federal income tax purposes. To the extent the Fund engages in short sales (which are not included in calculating the portfolio turnover rate), the transaction costs incurred by the Fund are likely to be greater than the transaction costs incurred by a mutual fund that does not take short positions and has a similar portfolio turnover rate.

The Fund’s performance shown below includes the performance of the Driehaus Emerging Markets Small Cap Growth Fund, L.P. (the “Predecessor Limited Partnership”), the Fund’s predecessor, for the periods before the Fund’s registration statement became effective. The Predecessor Limited Partnership was managed with substantially the same investment objective, policies and philosophies as are followed by the Fund. The Predecessor Limited Partnership was established on December 1, 2008, and the Fund succeeded to the Predecessor Limited Partnership’s assets on August 22, 2011. The Predecessor Limited Partnership was not registered under the Investment Company Act of 1940, as amended (“1940 Act”), and thus was not subject to certain investment and operational restrictions that are imposed by the 1940 Act. If the Predecessor Limited Partnership had been registered under the 1940 Act, its performance may have been adversely affected. The Predecessor Limited Partnership’s performance has been restated to reflect estimated expenses of the Fund. After-tax performance returns are not included for the Predecessor Limited Partnership. The Predecessor Limited Partnership was not a regulated investment company under Subchapter M of the Internal Revenue Code and therefore did not distribute current or accumulated earnings and profits and was not subject to the diversification and source of income requirements applicable to regulated investment companies.

During the periods shown in the bar chart, the highest return for a quarter was 35.39% (quarter ended 6/30/09) and the lowest return for a quarter was –17.13% (quarter ended 9/30/11).

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

* Driehaus Capital Management LLC, the Fund’s investment adviser, has entered into a contractual agreement to cap the Fund’s ordinary annual operating expenses (excluding interest, taxes, brokerage commissions and other investment-related costs and extraordinary expenses) at 2.00% of average daily net assets until the earlier of the termination of the investment advisory agreement, by the Board of Trustees or the Fund’s shareholders, or May 3, 2018. Pursuant to the agreement, and so long as the investment advisory agreement is in place, for a period of three years subsequent to the Fund’s commencement of operations on May 4, 2015, the investment adviser is entitled to reimbursement for previously waived fees and reimbursed expenses to the extent that the Fund’s expense ratio remains below the operating expense cap that was in place at the time of the waiver as well as the existing operating expense cap.

Expense Example: This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The expense reimbursement shown in the Annual Fund Operating Expenses table is reflected for the first two years in the Example. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the period from the Fund’s commencement of operations (May 4, 2015) through December 31, 2015, the Fund’s portfolio turnover was 66% of the average value of its portfolio.

The Fund uses a growth style of investment in equity securities, including common and preferred stocks, as well as American Depositary Receipts, European Depository Receipts and Global Depositary Receipts, and in equity-convertible securities, such as warrants, rights and options. The Fund may also invest in corporate and sovereign debt as well as futures, swaps, forward exchange contracts and non-deliverable forwards. Under normal market conditions, the Fund invests at least 80% of its net assets (plus the amount of borrowings for investment purposes) in frontier emerging market issuers. For purposes of the Fund’s investments, “frontier emerging market issuers” are those: (i) that have the principal exchange listing for their securities in a frontier emerging market; (ii) that conduct greater than fifty percent (50%) of their business, as measured by the location of their revenues, profits, assets, services rendered or production, in frontier emerging markets; (iii) that are linked to currencies of frontier emerging market countries; or (iv) that are legally domiciled in, organized under the laws of, or with principal offices in, frontier emerging market countries. “Frontier emerging markets” generally include all countries except the developed markets of Australia, Austria, Belgium, Canada, Denmark, Finland, France, Germany, Hong Kong, Ireland, Israel, Italy, Japan, the Netherlands, New Zealand, Norway, Portugal, Singapore, Spain, Sweden, Switzerland, the United Kingdom, and the United States and the larger traditionally–recognized emerging markets of Taiwan, Korea, Mexico, South Africa, Brazil, India, China and Russia. The Fund may invest in issuers across all market capitalizations, including micro-, small- and mid-capitalization issuers. The Fund may invest in companies with limited operating histories. The Fund is not an index fund that seeks to replicate the MSCI Frontier Markets Index (the “Index”), but the Fund’s performance is measured against the Index. The Index has significant concentrations in certain industries, and the investment adviser may position the Fund’s portfolio to concentrate in certain industries when the investment adviser deems appropriate and when the Index is concentrated in such industries. In addition, while the Fund will invest primarily in the securities of frontier emerging market issuers, the Fund may also from time to time invest up to a maximum of 20% of its assets in the securities of non-frontier emerging market issuers.

The Fund will invest in a relatively low number of issuers, making it a nondiversified fund. The Fund expects to frequently and actively trade its portfolio securities. Investment decisions for the Fund’s growth style of investing are based on the belief that fundamentally strong companies are more likely to generate superior earnings growth on a sustained basis and are more likely to experience positive earnings revisions. This decision involves evaluating a company’s competitive position, evaluating industry and country dynamics, identifying potential growth catalysts and assessing the financial position of the company. The decision is also based on the evaluation of relative valuation, macroeconomic and behavioral factors affecting the company and its stock price. The Fund sells holdings for a variety of reasons, including to take profits, changes to the fundamental investment thesis, changes in the risk/reward assessment of the holding, an assessment that the holding is efficiently priced, to make room for more attractive ideas or for other portfolio or risk management considerations.

securities markets; lower responsiveness of foreign management to shareholder concerns; economic issues or developments in foreign countries; fluctuation in exchange rates of foreign currencies and risks of devaluation; imposition of foreign withholding and other taxes; dependence of emerging market companies upon commodities which may be subject to economic cycles; and frontier emerging market risk such as limited trading volume, expropriation, devaluation or other adverse political or social developments.

Frontier Emerging Markets Risk. In addition to the risks associated with investing in foreign securities, investments in securities of issuers located in frontier emerging markets are speculative and subject to certain additional unique risks. There may be little financial or accounting information available with respect to issuers located in these countries, and it may be difficult as a result to assess the value or prospects of an investment in such issuers. Frontier emerging markets are characterized by, among other things, smaller and less diverse economies, less developed capital markets, greater market volatility, lower trading volume, less liquidity, trade barriers, political and economic instability, greater risk of a market shutdown and more governmental limitations on foreign investments than typically found in more developed markets, as well as new or unsettled securities laws. Many frontier emerging market countries may be dependent on commodities, foreign trade or foreign aid, resulting in more pronounced risks.

Concentration Risk. The Fund may invest up to 35% of its total assets in securities of companies in any one industry if, at the time of investment, that industry represents 20% or more of the Fund’s benchmark index, currently the MSCI Frontier Emerging Markets Index. Accordingly, at any time the Fund has such a concentration of investments in a single industry group, it will be particularly vulnerable to factors that adversely affect that industry group.

Micro-Cap Company Risk. The securities of micro-cap companies may be more volatile in price, have wider spreads between their bid and ask prices, and have significantly lower trading volumes than the securities of larger capitalization companies. As a result, the purchase or sale of more than a limited number of shares of the securities of a smaller company may affect its market price. The Fund may need a considerable amount of time to purchase or sell its positions in these securities. Some micro-cap companies are followed by few, if any, securities analysts, and there tends to be less publicly available information about such companies. Their securities generally have even more limited trading volumes and are subject to even more abrupt or erratic market price movements than are small-cap and mid-cap securities, and the Fund may be able to deal with only a few market-makers when purchasing and selling micro-cap securities. Such companies may also have limited markets, financial resources or product lines, may lack management depth, and may be more vulnerable to adverse business or market developments. These conditions, which create greater opportunities to find securities trading well below the Fund’s estimate of the company’s current worth, also involve increased risk.

Liquidity Risk. When there is little or no active trading market for specific types of securities, it can become more difficult to sell the securities at or near their perceived value. In such a market, the value of such securities and the Fund’s share price may fall dramatically. No active trading market may exist for some frontier emerging markets securities and certain frontier emerging markets securities may be subject to restrictions on resale. The inability to dispose of frontier emerging markets securities in a timely fashion could result in losses to the Fund. Investments in

most, but not all, frontier emerging markets securities tend to have greater exposure to liquidity risk than domestic securities.

The Fund’s returns will vary, and you could lose money. The bar chart and table showing the Fund’s annual return and average annual total returns are not included because the Fund does not have annual returns for a calendar year. When available, the bar chart will show the variability of the Fund’s return over time and the table will show how the Fund’s performance compares to a broad-based market index. Of course, the Fund’s past performance (before and after taxes) is not necessarily an indication of future performance. Updated performance information is available by visiting www.driehaus.com or by calling 1-800-560-6111.

If you purchase the Fund through a broker-dealer or other financial intermediary (such as a bank), the Fund and/or its related companies may pay the intermediary for the sale of Fund shares and/or related services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your financial intermediary’s website for more information.

Driehaus International Small Cap Growth Fund seeks to maximize capital appreciation.

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

The Fund uses a growth style of investment in equity securities, including common and preferred stocks, American Depositary Receipts and Global Depositary Receipts, and under normal market conditions, invests at least 80% of its net assets (plus the amount of borrowings for investment purposes) in the equity securities of non-U.S. small capitalization companies. The investment adviser currently considers non-U.S. small capitalization companies to be companies located in the same countries and within the same market capitalization range at the time of investment as those included in the MSCI All Country World ex USA Small Cap Growth Index. As of the date of this Prospectus, approximately 95% of the MSCI All Country World ex USA Small Cap Growth Index consisted of companies with a market capitalization of less than $5 billion. The Fund seeks to be opportunistic in pursuing companies that meet its criteria regardless of geographic location and, therefore, at certain times, the Fund could have sizeable positions in either developed countries or emerging markets. In addition, while the Fund will invest primarily in the equity securities of non-U.S. companies, the Fund may also from time to time invest up to a maximum of 20% of its assets in the equity securities of U.S. companies. The Fund may invest in companies with limited operating histories. The Fund will invest in a relatively low number of issuers, making it a nondiversified fund. The Fund frequently and

actively trades its portfolio securities. Investment decisions for the Fund’s growth style of investing are based on the determination that a company’s revenue and earnings growth can materially exceed market expectations and that the security is at an attractive entry point. This decision involves evaluating fundamental factors, including the company’s business model, the competitive landscape, upcoming product introductions and recent and projected financial metrics. The decision is also based on the evaluation of technical or market factors, including price and volume trends, relative strength and institutional interest. To a lesser extent, the Fund’s investment adviser also utilizes macroeconomic or country-specific analyses to evaluate the sustainability of a company’s growth rate. The Fund sells holdings for a variety of reasons, including the deterioration of the earnings profile, the violation of specific technical thresholds, to shift into securities with more compelling risk/reward characteristics or to alter sector or country exposure.

Emerging Market Risk. The Fund invests in emerging markets and therefore, the risks described above for foreign securities are typically increased. Investments in securities of issuers located in such countries are speculative and subject to certain special risks. The small size, limited trading volume and relative inexperience of the securities markets in these countries may make the Fund’s investments in such countries illiquid and more volatile than investments in more developed countries, and the Fund may be required to establish special custodial or other arrangements before making investments in these countries. There may be little financial or accounting information available with respect to issuers located in these countries, and it may be difficult as a result to assess the value or prospects of an investment in such issuers.

Small-Sized Company Risk. The Fund invests in companies that are smaller, less established, with less liquid markets for their stock, and therefore may be riskier investments. While small-sized companies generally have the potential for rapid growth, the securities of these companies often involve greater risks than investments in larger,

more established companies because small-sized companies may lack the management experience, financial resources, product diversification and competitive strengths of larger companies. In addition, in many instances the securities of small-sized companies are traded only over-the-counter or on a regional securities exchange, and the frequency and volume of their trading is substantially less than is typical of larger companies. The value of securities of smaller, less well known issuers can be more volatile than that of larger issuers.

The bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows the volatility — or variability — of the Fund’s annual total returns over time, and shows that Fund performance can change from year to year. The table shows the Fund’s average annual total returns for certain time periods compared to the returns of a broad-based securities index. Of course, the Fund’s past performance (before and after taxes) is not necessarily an indication of its future performance. Updated performance information is available by visiting www.driehaus.com or by calling 1-800-560-6111.

The Fund’s performance shown below includes the performance of the Driehaus International Opportunities Fund, L.P. (the “Predecessor Limited Partnership”), the Fund’s predecessor, for the periods before the Fund’s registration statement became effective. The Predecessor Limited Partnership was managed with substantially the same investment objective, policies and philosophies as are followed by the Fund. The Predecessor Limited Partnership was established on August 1, 2002 and the Fund succeeded to the Predecessor Limited Partnership’s assets on September 17, 2007. The Predecessor Limited Partnership was not registered under the Investment Company Act of 1940, as amended (“1940 Act”), and thus was not subject to certain investment and operational restrictions that are imposed by the 1940 Act. If the Predecessor Limited Partnership had been registered under the 1940 Act, its performance may have been adversely affected. The Predecessor Limited Partnership’s performance has been restated to reflect estimated expenses of the Fund. After-tax performance returns are not included for the Predecessor Limited Partnership. The Predecessor Limited Partnership was not a regulated investment company under Subchapter M of the Internal Revenue Code and therefore did not distribute current or accumulated earnings and profits and was not subject to the diversification and source of income requirements applicable to regulated investment companies.

During the periods shown in the bar chart, the highest return for a quarter was 24.89% (quarter ended 6/30/09) and the lowest return for a quarter was –29.85% (quarter ended 9/30/08).

The Fund is closed to new investors. For additional information, please see “Shareholder Information — General Purchase Information.” The following is applicable to eligible investors:

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

The Fund uses a growth style of investment in equity securities, including common and preferred stocks. Under normal market conditions, the Fund invests at least 80% of its net assets (plus the amount of borrowings for investment purposes) in the equity securities of U.S. micro-capitalization (“micro-cap”) companies. For purposes of the Fund, the investment adviser currently considers a company to be a micro-cap company if it is within the same market capitalization range at the time of investment as those included in the Russell Microcap^® Growth Index. As of the date of this Prospectus, 100% of the Russell Microcap^® Growth Index consisted of companies with a market capitalization of less than $1.5 billion. Securities of companies whose market capitalization no longer meets this definition after purchase may continue to be held by the Fund. In addition, while the Fund will invest primarily in the equity securities of U.S. micro-cap companies, the Fund may also from time to time invest up to a maximum of 20% of its assets in the equity securities of non-U.S. companies that trade in the U.S. or in securities of companies above the capitalization range of the Russell Microcap^® Growth Index. The Fund may invest in companies with limited operating histories. The Fund will invest in a relatively low number of issuers, making it a nondiversified fund. The Fund expects to frequently and actively trade its portfolio securities. Investment decisions for the Fund’s

growth style of investing are based on the belief that fundamentally strong companies are more likely to generate superior earnings growth on a sustained basis and are more likely to experience positive earnings revisions. This decision involves evaluating a company’s competitive position, evaluating industry dynamics, identifying potential growth catalysts and assessing the financial position of the company. The decision is also based on the evaluation of relative valuation, macroeconomic and behavioral factors affecting the company and its stock price. The Fund sells holdings for a variety of reasons, including to take profits, changes to the fundamental investment thesis, changes in the risk/reward assessment of the holding, an assessment that the holding is efficiently priced, to make room for more attractive ideas or for other portfolio or risk management considerations.

All investments, including those in mutual funds, have risks. No investment is suitable for all investors. The Fund is intended for long-term investors who can accept the risks involved in equity investing. Of course, there can be no assurance that the Fund will achieve its objective. You may lose money by investing in the Fund. Below are the main risks of investing in the Fund:

Micro-Cap Company Risk. The securities of micro-cap companies may be more volatile in price, have wider spreads between their bid and ask prices, and have significantly lower trading volumes than the securities of larger capitalization companies. As a result, the purchase or sale of more than a limited number of shares of the securities of a smaller company may affect its market price. The Fund may need a considerable amount of time to purchase or sell its positions in these securities. Some U.S. micro-cap companies are followed by few, if any, securities analysts, and there tends to be less publicly available information about such companies. Their securities generally have even more limited trading volumes and are subject to even more abrupt or erratic market price movements than are small-cap and mid-cap securities, and the Fund may be able to deal with only a few market-makers when purchasing and selling micro-cap securities. Such companies also may have limited markets, financial resources or product lines, may lack management depth, and may be more vulnerable to adverse business or market developments. These conditions, which create greater opportunities to find securities trading well below the investment adviser’s estimate of the company’s current worth, also involve increased risk.

Allocation Risk. The Fund’s overall risk level will depend on the market sectors in which the Fund is invested. Because the Fund may have significant weightings in a particular company, industry or market sector, the value of Fund shares may be affected by events that adversely affect that company, industry or market sector and may fluctuate more than that of a less focused fund.

The bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows the volatility — or variability — of the Fund’s annual total returns over time, and shows that Fund performance can change from year to year. The table shows the Fund’s average annual total returns for certain time periods compared to the returns of a broad-based securities index. Of course, the Fund’s past performance (before and after taxes) is not necessarily an indication of its future performance. Updated performance information is available by visiting www.driehaus.com or by calling 1-800-560-6111.

The Fund’s performance shown below includes the performance of the Driehaus Micro Cap Fund, L.P. (the “Predecessor Limited Partnership”), one of the Fund’s predecessors, for the periods before the Fund’s registration statement became effective. The Predecessor Limited Partnership, which was established on July 1, 1996, was managed with substantially the same investment objective, policies and philosophies as are followed by the Fund. The Fund succeeded to the Predecessor Limited Partnership’s assets together with the assets of the Driehaus Institutional Micro Cap Fund, L.P. (together, the “Limited Partnerships”) on November 18, 2013. The investment portfolios of the Limited Partnerships were identical and therefore had similar performance. The Fund is managed by Jeffrey James and Michael Buck, the same portfolio management team that managed the Predecessor Limited Partnership, with Mr. James as the portfolio manager since 1998 and Mr. Buck as the assistant portfolio manager since 2009, and Driehaus Institutional Micro Cap Fund, L.P, since its inception in 2011. The restated performance of the Predecessor Limited Partnership is shown here because it was in operation longer. The Limited Partnerships were not registered under the Investment Company Act of 1940, as amended (“1940 Act”), and thus were not subject to certain investment and operational restrictions that are imposed by the 1940 Act. If the Limited Partnerships had been registered under the 1940 Act, their performance may have been adversely affected. Accordingly, future Fund performance may be different than the Predecessor Limited Partnership’s restated past performance. The Predecessor Limited Partnership’s performance has been restated to reflect estimated expenses of the Fund. After-tax performance returns are not included for the Predecessor Limited Partnership. The Limited Partnerships were not regulated investment companies under Subchapter M of the Internal Revenue Code and therefore did not distribute current or accumulated earnings and profits and were not subject to the diversification and source of income requirements applicable to regulated investment companies.

During the periods shown in the bar chart, the highest return for a quarter was 25.77% (quarter ended 6/30/09) and the lowest return for a quarter was –29.14% (quarter ended 9/30/11).

If you purchase the Fund through a broker-dealer or other financial intermediary (such as a bank), the Fund’s related companies may pay the intermediary for the sale of Fund shares and/or related services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your financial intermediary’s web site for more information.

Driehaus Emerging Markets Growth Fund, Driehaus Emerging Markets Small Cap Growth Fund, Driehaus Frontier Emerging Markets Fund, Driehaus International Small Cap Growth Fund and Driehaus Micro Cap Growth Fund (each a “Fund” and together the “Funds”) strive to increase the value of your investment (capital appreciation). In other words, each Fund tries to buy equity securities with a potential to appreciate in price. Each Fund has its own strategy for achieving this goal with a related risk/return profile but employs common growth techniques. Because stock markets in general, and the individual securities purchased by the Funds, go down in price as well as up, you may lose money by investing in the Funds. The Funds are specialized investment vehicles and should be used as part of your overall investment strategy to diversify your holdings. The Funds are each a series of the Driehaus Mutual Funds (the “Trust”), an open-end management investment company. Please review all the disclosure information carefully.

Each Fund is managed by Driehaus Capital Management LLC (the “Adviser”), a registered investment adviser founded in 1982. As of March 31, 2016, the Adviser managed approximately $8.4 billion in assets.

The Adviser employs an active, growth equity investment philosophy that focuses on identifying company-specific growth inflection points and exploiting how stocks trade during subsequent periods. The Adviser believes markets tend to misprice stocks of companies following positive growth inflections and that these inefficiencies often follow predictable and exploitable patterns. Specifically, following a positive trend change in a company’s potential or expected earnings growth trajectory, the Adviser believes investors often underestimate the future magnitude, acceleration and/or duration of earnings growth as they anchor their views to past information. Additionally, the Adviser believes investors may underestimate the multiple expansions that follow growth inflections. The Adviser looks to exploit these inefficiencies by using fundamental and macro research to capitalize on the behavioral dynamics of the market. The Adviser will sell a holding based on a number of factors including to take profits, changes to the fundamental investment thesis, changes in the risk/reward assessment of the holding, an assessment that the holding is efficiently priced, to make room for more attractive ideas or for other portfolio or risk management considerations. This investment philosophy results in high portfolio turnover. High portfolio turnover in any year may result in payment by the Funds of above-average amounts of transaction costs and could result in the payment by shareholders of above-average amounts of taxes on realized investment gains.

The Funds intend to pay dividends, if any, at least annually. Such distributions can consist of both ordinary income and any realized capital gains. Unless you are purchasing Fund shares through a tax-advantaged account (such as an IRA), buying Fund shares at a time when the Fund has substantial undistributed income or gains can cost you money in taxes. Contact the Funds for information concerning when distributions will be paid. On a continuing basis, due to high portfolio turnover of the Funds, a greater percentage of capital gains may be paid each year by a Fund with a

significant percentage of those capital gains constituting short-term capital gains, which are taxed at ordinary income tax rates for federal income tax purposes. You should consult your tax advisor regarding your tax situation.

Driehaus Emerging Markets Growth Fund. The investment objective of the Driehaus Emerging Markets Growth Fund is to maximize capital appreciation. This investment objective is fundamental and cannot be changed without the approval of shareholders. The Fund pursues its objective by investing primarily in the equity securities of emerging market companies. Emerging market companies are (i) companies organized under the laws of an emerging market country or having securities which are traded principally on an exchange or over-the-counter in an emerging market country; or (ii) companies which, regardless of where organized or traded, have a significant amount of assets located in and/or derive a significant amount of their revenues from goods purchased or sold, investments made or services performed in or with emerging market countries. Currently, emerging markets include every country in the world other than the United States, Canada, Japan, Australia, New Zealand, Hong Kong, Singapore, Israel and most Western European countries. Under normal market conditions, at least 80% of the Fund’s net assets (plus the amount of borrowings for investment purposes) will be invested in the equity securities of emerging markets companies. The Fund will provide shareholders 60 days’ prior written notice of a change in the Fund’s non-fundamental policy of investing at least 80% of its net assets in emerging markets companies. There are also no specific limitations on the percentage of assets that may be invested in securities of issuers located in any one country at a given time; the Fund may invest significant assets in any single emerging market country. The Fund is a nondiversified fund. Current dividend income is not an investment consideration and dividend income is incidental to the Fund’s overall investment objective. The Fund may also invest in securities of issuers that have limited operating histories.

Equity securities include common and preferred stocks, bearer and registered shares, warrants or rights or options that are convertible into common stock, debt securities that are convertible into common stock, depositary receipts for those securities, and other classes of stock that may exist. The Fund may purchase foreign securities in the form of sponsored or unsponsored depositary receipts or other securities representing underlying shares of foreign issuers. The Fund may purchase depositary receipts, rather than invest directly in the underlying shares of a foreign issuer, for liquidity, timing or transaction cost reasons. The Fund may also invest in domestic and foreign investment companies which, in turn, invest primarily in securities which the Fund could hold directly.

The Adviser generally intends to remain fully invested. However, the Fund may, from time to time, take temporary defensive positions that are inconsistent with the Fund’s principal investment strategy in attempting to respond to adverse market, economic, political or other conditions. As a temporary defensive measure, the Fund may hold some or all of its assets in cash or cash equivalents in domestic and foreign currencies, invest in domestic and foreign money market securities (including repurchase agreements), purchase short-term debt securities of U.S. or foreign government or corporate issuers, or invest in money market funds which purchase one or more of the foregoing. The Fund may also purchase such securities if the Adviser believes they may be necessary to meet the Fund’s liquidity needs. During periods of time when the Fund is not fully invested, the Fund may not achieve its investment objective.

Driehaus Emerging Markets Small Cap Growth Fund. The investment objective of the Fund is to maximize capital appreciation. This investment objective is fundamental and cannot be changed without the approval of shareholders. The Fund pursues its objective by investing primarily in the equity securities of small capitalization emerging markets companies. Under normal market conditions, the Fund invests substantially all (no less than 80%) of its net assets (plus the amount of borrowings for investment purposes) in small capitalization emerging markets companies. For purposes of the Fund, the Adviser currently considers a company to be a small capitalization emerging markets company if it is within the same market capitalization range at the time of investment as those included in the MSCI Emerging Markets Small Cap Index. As of the date of this Prospectus, 100% of the MSCI Emerging Markets Small Cap Index consisted of companies with a market capitalization of less than $4 billion.

The Fund will provide shareholders 60 days’ prior written notice of a change in the Fund’s non-fundamental policy of investing at least 80% of its net assets in small capitalization emerging markets companies. The Fund’s investments in options on emerging markets company stocks and emerging markets exchange-traded funds will be counted toward its policy to invest at least 80% of its net assets in small capitalization emerging markets companies under normal market conditions. In addition, securities of companies whose market capitalization no longer meets this definition

after purchase many continue to be held by the Fund. The Fund may invest in companies with higher market capitalizations if market conditions suggest doing so will help the Fund achieve its objective. Emerging markets companies are (i) companies organized under the laws of an emerging market country or having securities which are traded principally on an exchange or over-the-counter in an emerging market country; or (ii) companies which, regardless of where organized or traded, have a significant amount of assets located in and/or derive a significant amount of their revenues from goods purchased or sold, investments made or services performed in or with emerging market countries. Currently, emerging markets include every country in the world other than the United States, Canada, Japan, Australia, New Zealand, Hong Kong, Singapore, Israel and most Western European countries. There are also no specific limitations on the percentage of assets that may be invested in securities of issuers located in any one country at a given time; the Fund may invest significant assets in any single emerging market country. The Fund will invest in a relatively low number of issuers, making it a nondiversified fund. Current dividend income is not an investment consideration and dividend income is incidental to the Fund’s overall investment objective. The Fund may also invest in securities of issuers that have limited operating histories.

Equity securities include common and preferred stocks, American Depositary Receipts (“ADR”), Global Depositary Receipts (“GDR”), equity-convertible securities such as warrants, rights, or options, and other classes of stock that may exist. The Fund may purchase foreign securities in the form of sponsored or unsponsored depositary receipts or other securities representing underlying shares of foreign issuers. The Fund may purchase ADRs or GDRs, rather than invest directly in the underlying shares of a foreign issuer, for liquidity, timing or transaction cost reasons.

The Fund may purchase or write options on equity securities, exchange traded funds and other similar securities as well as on futures. The Fund may also engage in short sale transactions. The primary purpose of these activities is to hedge exposures within the Fund’s portfolio but the Fund may also do so speculatively for purposes of profiting from the movements of underlying securities. In seeking to achieve its desired investment objective, the Fund may invest in currency forwards, sovereign debt, credit default swaps, and interest rate swaps.

Driehaus Frontier Emerging Markets Fund. The investment objective of the Fund is to maximize capital appreciation. This investment objective is fundamental and cannot be changed without the approval of shareholders. The Fund pursues its objective by investing primarily in securities of frontier emerging market companies. Under normal market conditions, the Fund invests at least 80% of its net assets (plus the amount of borrowings for investment purposes) in frontier emerging market issuers. For purposes of the Fund’s investments, “frontier emerging market issuers” are those: (i) that have the principal exchange listing for their securities in a frontier emerging market; (ii) that conduct greater than fifty percent (50%) of its business, as measured by the location of their revenues, profits, assets, services rendered or production, in frontier emerging markets; (iii) that are linked to currencies of frontier emerging market countries; or (iv) that are legally domiciled in, organized under the laws of, or with principal offices in, frontier emerging market countries. “Frontier emerging markets” generally include all countries except the developed markets of Australia, Austria, Belgium, Canada, Denmark, Finland, France, Germany, Hong Kong, Ireland, Israel, Italy, Japan, the Netherlands, New Zealand, Norway, Portugal, Singapore, Spain, Sweden, Switzerland, the United Kingdom, and the United States and the larger traditionally–recognized emerging markets of Taiwan, Korea, Mexico, South Africa, Brazil, India, China and Russia. The Fund may invest in issuers across all market capitalizations, including micro, small and mid-capitalization issuers. The Fund is not an index fund that seeks to replicate the MSCI Frontier Markets Index (the “Index”), but the Fund’s performance is measured against the Index. The Index has significant concentrations in certain industries, and the Adviser may position the Fund’s portfolio to concentrate in certain industries when the Adviser deems appropriate and when the Index is concentrated in such industries.

The Fund will provide shareholders 60 days’ prior written notice of a change in the Fund’s non-fundamental policy of investing under normal market conditions at least 80% of its net assets (plus the amount of borrowings for investment purposes) in frontier emerging market issuers. There are no specific limitations on the percentage of assets that may be invested in securities of issuers located in any one country or region at a given time; the Fund may invest significant assets in any single frontier emerging market country or region. In addition, while the Fund will invest primarily in the securities of frontier emerging market issuers, the Fund may also from time to time invest up to a maximum of 20% of its assets in the securities of non-frontier emerging market issuers. The Fund will invest in a relatively low number of issuers, making it a nondiversified fund. Current dividend income is not an investment consideration, and dividend income is incidental to the Fund’s overall investment objective. The Fund may also invest in securities of issuers with limited operating histories.

Equity securities include common and preferred stocks, American Depositary Receipts (“ADR”), European Depository Receipts (“EDR”), Global Depositary Receipts (“GDR”), equity-convertible securities such as warrants, rights, or options, and other classes of stock that may exist. The Fund may purchase foreign securities in the form of sponsored or unsponsored depositary receipts or other securities representing underlying shares of foreign issuers. The Fund may purchase ADRs, EDRs or GDRs, rather than invest directly in the underlying shares of a foreign issuer, for liquidity, timing or transaction cost reasons.

The Adviser generally intends to remain fully invested. However, the Fund may, from time to time take temporary defensive positions that are inconsistent with the Fund’s Principal Investment Strategies in attempting to respond to adverse market, economic, political or other conditions. As a temporary defensive measure, the Fund may hold some or all of its assets in cash or cash equivalents in domestic and foreign currencies, invest in domestic and foreign money market securities (including repurchase agreements), purchase short-term debt securities of U.S. or foreign government or corporate issuers, or invest in money market funds which purchase one or more of the foregoing. The Fund may also purchase such securities if the Adviser believes they may be necessary to meet the Fund’s liquidity needs. During periods of time when the Fund is not fully invested, the Fund may not achieve its investment objective.

Driehaus International Small Cap Growth Fund. The investment objective of the Driehaus International Small Cap Growth Fund is to maximize capital appreciation. This investment objective is fundamental and cannot be changed without the approval of shareholders. The Fund invests primarily in equity securities of smaller capitalization non-U.S. companies exhibiting strong growth characteristics. Under normal market conditions, the Fund invests at least 80% of its net assets (plus the amount of borrowings for investment purposes) in the equity securities of non-U.S. small capitalization companies. The Adviser currently considers non-U.S. small capitalization companies to be companies located in the same countries and within the same market capitalization range at the time of investment as those included in the MSCI All Country World ex USA Small Cap Growth Index. As of the date of this Prospectus, approximately 95% of the MSCI All Country World ex USA Small Cap Growth Index consisted of companies with a market capitalization of less than $5 billion. The Fund will provide shareholders 60 days’ prior written notice of a change in the Fund’s non-fundamental policy of investing at least 80% of its net assets in the equity securities of non-U.S. small cap companies. In some countries, a small company by U.S. standards might rank among the largest in that country in terms of capitalization. The capitalization parameter is subject to change as the relative market capitalization of small cap issuers change over time. There is no maximum limit on the number of companies in which the Adviser can invest at a given time. There is no specific limitation on the percentages of assets that may be invested in securities of issuers located in any one country at any given time. The Fund is a nondiversified fund. At certain times, the Fund could have sizeable positions in either developed countries or emerging markets. In addition, while the Fund will invest primarily in the equity securities of non-U.S. companies, the Fund may also from time to time invest up to a maximum of 20% of its assets in the equity securities of U.S. companies. Many, but not all, of these companies will be U.S. companies that have a significant amount of assets located in and/or derive a significant amount of their revenue from goods purchased or sold, investments made, or services performed in or with non-U.S. countries. The Fund may also invest in securities of issuers with limited operating histories.

The securities markets of many developing economies are sometimes referred to as “emerging markets.” The amount of the Fund’s assets invested in emerging markets will vary over time and could be substantial. Currently, emerging markets generally include every country in the world other than the United States, Canada, Japan, Australia, New Zealand, Hong Kong, Singapore, Israel and most Western European countries. The Fund is not limited to a

specific percentage of assets that may be invested in a single emerging market country, although at all times the Fund must be invested in at least three countries (not limited to emerging markets countries).

Equity securities include common and preferred stocks, bearer and registered shares, warrants or rights or options that are convertible into common stock, debt securities that are convertible into common stock, depositary receipts for those securities, and other classes of stock that may exist. The Fund may purchase foreign securities in the form of sponsored or un-sponsored depositary receipts or other securities representing underlying shares of foreign issuers. The Fund may purchase depositary receipts, rather than invest directly in the underlying shares of a foreign issuer, for liquidity, timing or transaction cost reasons. The Fund may also invest in domestic and foreign investment companies which, in turn, invest primarily in securities which the Fund could hold directly.

The Adviser generally intends to remain fully invested. However, the Fund may, from time to time, take temporary defensive positions that are inconsistent with the Fund’s principal investment strategy in attempting to respond to adverse market, economic, political or other conditions. As a temporary defensive measure, the Fund may hold some or all of its assets in cash or cash equivalents in domestic and foreign currencies, invest in domestic and foreign money market securities (including repurchase agreements), purchase short-term debt securities of U.S. or foreign government or corporate issuers, or invest in money market funds which purchase one or more of the foregoing. The Fund may also purchase such securities if the Adviser believes they may be necessary to meet the Fund’s liquidity needs. During periods of time when the Fund is invested defensively, the Fund may not achieve its investment objective.

Driehaus Micro Cap Growth Fund. The Driehaus Micro Cap Growth Fund seeks to maximize capital appreciation. This investment objective is fundamental and cannot be changed without the approval of shareholders. The Fund invests primarily in equity securities of micro-cap U.S. companies exhibiting strong growth characteristics. Under normal market conditions, the Fund invests at least 80% of its net assets (plus the amount of borrowings for investment purposes) in the equity securities of U.S. micro-cap companies. The Fund will provide shareholders 60 days’ prior written notice of a change in the Fund’s non-fundamental policy of investing at least 80% of its net assets in the equity securities of U.S. micro-cap companies. For purposes of the Fund, the Adviser currently considers a company to be a micro-cap company if it is within the same market capitalization range at the time of investment as those included in the Russell Microcap^® Growth Index. As of the date of this Prospectus, 100% of the Russell Microcap^® Growth Index consisted of companies with a market capitalization of less than $1.5 billion. Securities of companies whose market capitalization no longer meets this definition after purchase may continue to be held by the Fund. The Fund is a nondiversified fund. Current dividend income is not an investment consideration, and dividend income is incidental to the Fund’s overall investment objective. The Fund may also invest in securities of issuers with limited operating histories.

Equity securities include common and preferred stocks, bearer and registered shares, warrants or rights or options that are convertible into common stock, debt securities that are convertible into common stock, depositary receipts for those securities, and other classes of stock that may exist. The Fund may invest in cash, money market mutual funds or similar cash equivalents. While the Fund will invest primarily in the securities of U.S. companies, the Fund may also invest in American Depositary Receipts and American Depositary Shares, but generally in an amount no greater than 20% of the assets of the Fund (measured as of the date of investment).

The Adviser generally intends to remain fully invested. However, the Fund may, from time to time, take temporary defensive positions that are inconsistent with the Fund’s principal investment strategy in attempting to respond to adverse market, economic, political or other conditions. As a temporary defensive measure, the Fund may hold some or all of its assets in cash, money market mutual funds or similar cash equivalents. The Fund may also purchase such securities if the Adviser believes they may be necessary to meet the Fund’s liquidity needs. During periods of time when the Fund is invested defensively, the Fund may not achieve its investment objective.

This section contains greater detail on the risks an investor would face as a shareholder in the Funds based on the Funds’ investment objectives and strategies.

Market Risk. Each Fund is subject to market risk, which is the possibility that stock prices overall will decline over short or long periods. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. These fluctuations are expected to have a substantial influence on the value of each Fund’s shares.

Growth Stock Risk. Growth stocks are typically priced higher than other stocks, in relation to earnings and other measures, because investors believe they have more growth potential. This potential may or may not be realized and, if it is not realized, may result in a loss to a Fund. Growth stock prices also tend to be more volatile than the overall market.

Foreign Securities and Currencies Risk. The Driehaus Emerging Markets Growth Fund, Driehaus Emerging Markets Small Cap Growth Fund, Driehaus Frontier Emerging Markets Fund and Driehaus International Small Cap Growth Fund may invest in foreign securities. Investing outside the U.S. involves different risks than domestic investments. The Adviser believes that it may be possible to obtain significant returns from a Fund’s portfolio of foreign investments and to achieve increased diversification in comparison to a personal investment portfolio invested solely in U.S. securities. An investor may gain increased diversification by adding securities from various foreign countries (i) which offer different investment opportunities, (ii) that generally are affected by different economic trends, and (iii) whose stock markets do not generally move in a manner parallel to U.S. markets. At the same time, these opportunities and trends involve risks that may not be encountered in U.S. investments.

Investors should understand and consider carefully the greater risks involved in foreign investing. Investing in foreign securities — positions which are generally denominated in foreign currencies — and utilization of forward foreign currency exchange contracts involve certain considerations comprising both risks and opportunities not typically associated with investing in U.S. securities. These considerations include: fluctuations in exchange rates of foreign currencies; possible imposition of exchange control regulations or currency restrictions that would prevent cash from being brought back to the U.S.; less public information with respect to issuers of securities; less government supervision of stock exchanges, securities brokers, and issuers of securities; lack of uniform accounting, auditing and financial reporting standards; lack of uniform settlement periods and trading practices; less liquidity and frequently greater price volatility in foreign markets than in the U.S.; possible imposition of foreign taxes; possible investment in the securities of companies in developing as well as developed countries; the possibility of expropriation or confiscatory taxation, seizure or nationalization of foreign bank deposits or other assets, establishment of exchange controls, the adoption of foreign government restrictions and other adverse political, social or diplomatic developments that could affect investment in these nations; sometimes less advantageous legal, operational and financial protections applicable to foreign subcustodial arrangements; and the historical lower level of responsiveness of foreign management to shareholder concerns (such as dividends and return on investment).

The Driehaus Micro Cap Growth Fund may invest in U.S. dollar-denominated securities of foreign issuers traded in the U.S. Such investments increase a portfolio’s diversification and may enhance return, but they may also involve additional risk, including market, political and regulatory risk.

To the extent portfolio securities are issued by foreign issuers or denominated in foreign currencies, the Funds’ investment performance is affected by the strength or weakness of the U.S. dollar against these currencies. Generally, an increase in the value of the U.S. dollar against a foreign currency will reduce the value of a security denominated in that foreign currency, thereby decreasing a Fund’s overall net asset value. Currency rates in foreign countries may fluctuate significantly over short or long periods of time for a number of reasons, including changes in interest rates, imposition of currency controls and economic or political developments in the U.S. or abroad.

Emerging Market Risks. The Driehaus Emerging Markets Growth Fund and Driehaus Emerging Markets Small Cap Growth Fund invest primarily in emerging markets. The Driehaus International Small Cap Growth Fund may also invest a substantial portion of its assets in emerging market securities. The risks described above for foreign securities, including the risks of nationalization and expropriation of assets, are typically increased to the extent that a Fund invests in issuers located in less developed and developing nations. These securities markets are sometimes referred to as “emerging markets.” Investments in securities of issuers located in such countries are speculative and subject to certain special risks. The political and economic structures in many of these countries may be in their infancy and developing rapidly, and such countries may lack the social, political and economic characteristics of more developed countries. Certain of these countries have in the past failed to recognize private property rights and have at times nationalized and expropriated the assets of private companies. Some countries have inhibited the conversion of their

currency to another. The currencies of certain emerging market countries have experienced devaluation relative to the U.S. dollar, and future devaluations may adversely affect the value of a Fund’s assets denominated in such currencies. There is some risk of currency contagion; the devaluation of one currency leading to the devaluation of another. As one country’s currency experiences “stress,” there is concern that the “stress” may spread to another currency. Many emerging markets have experienced substantial, and in some periods extremely high, rates of inflation for many years. Continued inflation may adversely affect the economies and securities markets of such countries. In addition, unanticipated political or social developments may affect the value of a Fund’s investments in these countries and the availability to the Fund of additional investments in these countries. The small size, limited trading volume and relative inexperience of the securities markets in these countries may make a Fund’s investments in such countries illiquid and more volatile than investments in more developed countries, and the Fund may be required to establish special custodial or other arrangements before making investments in these countries. There may be little financial or accounting information available with respect to issuers located in these countries, and it may be difficult as a result to assess the value or prospects of an investment in such issuers. Based upon the apparent correlation between commodity cycles and a country’s securities markets, additional risk may exist.

Frontier Emerging Markets Risk. The Driehaus Frontier Emerging Markets Fund invests primarily in frontier emerging markets. Each of the “Emerging Markets Risks” described above also applies to investments in frontier emerging markets securities. In addition to the risks associated with investing in emerging market securities, investments in securities of issuers located in frontier emerging markets are speculative and subject to certain additional unique risks. The risks described above for emerging market securities, including the risks of nationalization and expropriation of assets, are typically increased to the extent that the Fund invests in issuers located in less developed and developing nations. Frontier emerging markets are characterized by, among other things, smaller and less diverse economies, less developed capital markets, greater market volatility, lower trading volume, less liquidity, trade barriers, political and economic instability, greater risk of a market shutdown and more governmental limitations on foreign investments than typically found in more developed markets, as well as new or unsettled securities laws.

Concentration Risk. The Driehaus Frontier Emerging Markets Fund may invest up to 35% of its total assets in securities of companies in any one industry if, at the time of investment, that industry represents 20% or more of the Fund’s benchmark index, currently the MSCI Frontier Emerging Markets Index. Accordingly, at any time the Fund has such a concentration of investments in a single industry group, it will be particularly vulnerable to factors that adversely affect that industry group.

Micro-Cap Company Risk. The securities of micro-cap companies may be more volatile in price, have wider spreads between their bid and ask prices, and have significantly lower trading volumes than the securities of larger capitalization companies. As a result, the purchase or sale of more than a limited number of shares of the securities of a smaller company may affect its market price. The Driehaus Micro Cap Growth Fund and the Driehaus Frontier Emerging Markets Fund may need a considerable amount of time to purchase or sell their positions in these securities. Some micro-cap companies are followed by few, if any, securities analysts, and there tends to be less publicly available information about such companies. Their securities generally have even more limited trading volumes and are subject to even more abrupt or erratic market price movements than are small-cap and mid-cap securities, and the Driehaus Micro Cap Growth Fund and Driehaus Frontier Emerging Markets Fund may be able to deal with only a few market-makers when purchasing and selling micro-cap securities. Such companies also may have limited markets, financial resources or product lines, may lack management depth, and may be more vulnerable to adverse business or market developments. These conditions, which create greater opportunities to find securities trading well below the Adviser’s estimate of the company’s current worth, also involve increased risk.

Small- and Medium-Sized Company Risk. The Funds invest in companies that are smaller, less established, with less liquid markets for their stock, and therefore may be riskier investments. While small- and medium-sized companies generally have the potential for rapid growth, the securities of these companies often involve greater risks than investments in larger, more established companies because small- and medium-sized companies may lack the management experience, financial resources, product diversification and competitive strengths of larger companies. In addition, in many instances the securities of small- and medium-sized companies are traded only over-the-counter or on a regional securities exchange, and the frequency and volume of their trading is substantially less than is typical of

larger companies. The value of securities of smaller, less well known issuers can be more volatile than that of larger issuers.

Nondiversification. Because each Fund may invest a greater percentage of assets in a particular issuer or a small number of issuers, they may be subject to greater risks and larger losses than diversified funds. The value of each Fund may vary more as a result of changes in the financial condition or the market’s assessment of the issuers than a more diversified fund.

Allocation Risk. A Fund’s overall risk level will depend on the countries and market sectors in which the Fund is invested. Because a Fund may have significant weightings in a particular company, country, industry or market sector, the value of Fund shares may be affected by events that adversely affect that company, country, industry or market sector and may fluctuate more than that of a less focused fund.

Portfolio Turnover. A Fund’s annual turnover rate indicates changes in its portfolio investments. The Adviser will not consider portfolio turnover rate a limiting factor in making investment decisions consistent with the Fund’s investment objective and policies. It is anticipated that the Funds will each experience high rates of portfolio turnover. High portfolio turnover in any year will result in payment by a Fund of above-average amounts of transaction costs and could result in the payment by shareholders of taxes on above-average amounts of realized investment gains, including net short-term capital gains, which are taxed as ordinary income for federal income tax purposes. To the extent the Driehaus Emerging Markets Small Cap Growth Fund engages in short sales (which are not included in calculating the portfolio turnover rate), the transaction costs incurred by the Fund are likely to be greater than the transaction costs incurred by a mutual fund that does not take short positions and has a similar portfolio turnover rate. Under normal market conditions, only securities that increase in value shortly after purchase and that generally continue to increase in value (although they may experience temporary stagnant or declining periods) will be retained by the Funds. Securities sold by a Fund may be purchased again at a later date if the Adviser perceives that the securities are again “timely.” In addition, portfolio adjustments will be made when conditions affecting relevant markets, particular industries or individual issues warrant such action. In light of these factors and the historical volatility of foreign and domestic growth stocks, the Funds are likely to experience high portfolio turnover rates, but portfolio turnover rates may vary significantly from year to year as noted in the Funds’ Financial Highlights. Portfolio turnover may also be affected by sales of portfolio securities necessary to meet cash requirements for redemptions of shares.

Manager Risk. How the Adviser manages each Fund will impact the Fund’s performance. A Fund may lose money if the Adviser’s investment strategy does not achieve the Fund’s objective or the Adviser does not implement the strategy successfully.

Short Sale Risk. Short sales expose the Driehaus Emerging Markets Small Cap Growth Fund to the risk that it will be required to buy the security sold short (also known as “covering” the short position) at a time when the security has appreciated in value, thus resulting in a loss to the Fund. The amount the Fund could lose on a short sale is theoretically unlimited (as compared to a long position, where the maximum loss is the amount invested). The use of short sales may also cause the Fund to have higher expenses than those of other funds.

Main Risks of Derivatives. The Driehaus Emerging Markets Small Cap Growth Fund may purchase or write options on equity securities, exchange-traded funds and other similar securities as well as on futures. In seeking to achieve its desired investment objective, the Driehaus Emerging Markets Small Cap Growth Fund may invest in currency forwards, sovereign debt, credit default swaps, and interest rate swaps. The Driehaus Emerging Markets Small Cap Growth Fund may hedge the Fund’s exposure to its portfolio of small capitalization (“small cap”) emerging markets equity securities by entering into credit default swap agreements on sovereign debt. The Fund also may enter into

equity index futures contracts for purposes of hedging the Fund’s investments in small cap emerging markets equity securities. Derivative instruments (such as swaps, options, futures and forwards) often have risks similar to their underlying currency, security or index, in addition to other risks. The use of derivatives also involves risks different from, and possibly greater than, the risks associated with investing directly in the underlying assets. Derivatives can be highly volatile, illiquid and difficult to value, and there is a risk of imperfect correlation between the value of the derivative and the underlying instrument. Derivative instruments may give rise to leverage and losses on derivatives may substantially exceed the initial investment. When used for hedging, the change in value of the derivative may also not correlate specifically with the currency, security or other risk being hedged. Further, since the Fund may invest in derivatives for speculative purposes, losses from speculative positions in a derivative may be much greater than the derivative’s original cost and may be substantial. With over-the-counter derivatives, there is the risk that the other party to the transaction could default. Derivatives may be subject to pricing or “basis” risk, which exists when a particular derivative becomes extraordinarily expensive relative to historical prices or the prices of its corresponding instrument. Additionally, to the extent the Fund is required to segregate or “set aside” (often referred to as “asset segregation”) liquid assets or otherwise cover open positions with respect to certain derivative instruments, the Fund may be required to sell portfolio instruments to meet these asset segregation requirements. There is a possibility that segregation involving a large percentage of the Fund’s assets could impede portfolio management or the Fund’s ability to meet redemption requests or other current obligations.

Deliverable and Non-Deliverable Foreign Currency Forwards and Options Risk. Deliverable and Non-Deliverable foreign currency forward and options contracts involve the risk that anticipated currency movements will not be accurately predicted, which could result in losses on those contracts and additional transaction costs. The use of forward and options contracts could reduce performance if there are unanticipated changes in currency prices. Options on foreign currencies are affected by the factors that influence foreign exchange rates and investments generally. The Fund’s ability to establish and close out positions on foreign currency options is subject to the maintenance of a liquid secondary market, and there can be no assurance that a liquid secondary market will exist for a particular option at any specific time.

Options and Futures Contracts Risk. Participation in the options or futures markets involves investment risks and transaction costs to which the Fund would not be subject absent the use of these strategies. In particular, the loss from investing in futures contracts is potentially unlimited. If the Fund’s investment adviser’s prediction of movements in the underlying reference securities, interest rate or currency markets is inaccurate, the Fund could be in a worse position than if such strategies were not used. Risks inherent in the use of options, futures contracts and options on futures contracts include: (1) imperfect correlation between the price of options and futures contracts and options thereon and movements in the prices of the securities being hedged; (2) the fact that skills needed to use these strategies are different from those needed to select portfolio securities; and (3) the possible absence of a liquid secondary market for any particular instrument at any time. With respect to equity index futures contracts entered into by the Driehaus Emerging Markets Small Cap Growth Fund, there are significant differences between the securities and futures markets that could result in an imperfect correlation between the markets, causing a given transaction not to achieve its objectives. The degree of imperfection of correlation depends on circumstances such as variations in speculative market demand for futures, futures options and the related securities, including technical influences in futures and futures options trading and differences between the securities markets and the securities underlying the standard contracts available for trading. For example, the composition of the index, including the issuers and the weighting of each issue, may differ from the composition of the Fund’s portfolio.

Swaps Risk. Swaps can involve greater risks than direct investment in securities, because swaps may be leveraged and are subject to counterparty risk (e.g., the risk of a counterparty’s defaulting on the agreement), credit risk and pricing risk (i.e., swaps may be difficult to value). In instances where an investment in a swap is meant to be correlated to an investment in the instrument or security underlying the swap, such correlation may not be perfect and/or may not result in the expected outcome due to these added risks. In addition, it may not be possible for the Fund to liquidate a swap position at an advantageous time or price, which may result in significant losses. As a result of the Dodd-Frank Act, certain swap agreements may be cleared through a clearinghouse and traded on an exchange or swap execution facility. The regulation of swaps markets has increased over the last few years, and future regulation of the swaps markets may make swaps more costly, may limit the availability of swaps, or may otherwise adversely affect the value or performance of swaps. Any such adverse future developments could impair the effectiveness of the Fund’s swaps transactions and cause the Fund to lose value.

Sovereign Debt Risk. The Driehaus Emerging Markets Small Cap Growth Fund may invest in sovereign debt instruments. Sovereign debt securities are subject to various risks in addition to those relating to debt securities and foreign securities generally, including, but not limited to, the risk that a governmental entity may be unwilling or unable to pay interest and repay principal on its sovereign debt, or otherwise meet its obligations when due because of cash flow problems, insufficient foreign reserves, the relative size of the debt service burden to the economy as a whole, the government’s policy towards principal international lenders such as the International Monetary Fund, or the political considerations to which the government may be subject. If a sovereign debtor defaults (or threatens to default) on its sovereign debt obligations, the indebtedness may be restructured. Some sovereign debtors have in the past been able to restructure their debt payments without the approval of some or all debt holders or to declare moratoria on payments. In the event of a default on sovereign debt, the Driehaus Emerging Markets Small Cap Growth Fund may also have limited legal recourse against the defaulting government entity.

The Driehaus Emerging Markets Small Cap Growth Fund may hold short positions in sovereign debt instruments for purposes of hedging the Fund’s small cap emerging market equity securities portfolio. Short sales on sovereign debt are also subject to risks discussed under the heading “Principal Risks” and the sub-headings “Foreign Securities and Currencies Risk” and “Short Sale Risk.”

All investments, including those in mutual funds, have risks. No investment is suitable for all investors. Each Fund is intended for long-term investors. Of course, there can be no assurance that a Fund will achieve its investment objective. There are specific restrictions on each Fund’s investments. Such restrictions are detailed in the Statement of Additional Information (“SAI”). Some investment practices described below may not be permissible for a Fund. In addition to the principal risks discussed in the Fund Summaries, the Funds’ investments involve additional potential risks which are summarized below. The SAI also contains more detailed or additional information about certain of these practices, the potential risks and/or the limitations adopted by each Fund to help manage such risks. Each Fund may not use all of these techniques or strategies or might only use them from time-to-time.

Recent Market Events Risk. The domestic and foreign equity and debt capital markets have experienced unprecedented volatility in the past several years. This financial crisis has caused a significant decline in the value and liquidity of many securities and may create a higher degree of volatility in the net asset values of many mutual funds, including the Funds. Because these events are unprecedented, it is difficult to predict their magnitude or duration. Changes in market conditions will not have the same impact on all types of securities. In response to the crisis, the U.S. government, the Federal Reserve and certain foreign banks have taken steps to support financial markets, including by keeping interest rates at historically low levels. More recently, the Federal Reserve has reduced its market support activities. Further reduction or withdrawal of this support could negatively impact financial markets generally as well as result in higher interest rates, increased market volatility and reduce the value and liquidity of certain securities.

Impact of Certain Investments. The Funds may invest in a variety of securities, including those sold in initial public offerings and derivatives. Such investments may have a magnified performance impact on a Fund depending on a Fund’s size. A Fund may not experience similar performance as its assets grow or its investments change.

Depositary Receipts. The Funds may invest in foreign securities in the form of depositary receipts and/or securities traded directly on U.S. exchanges. Depositary receipts represent ownership of securities in foreign companies and are held in banks and trust companies. They include American Depositary Receipts (“ADRs”), which are traded on U.S. exchanges and are U.S. dollar-denominated.

Although ADRs do not eliminate the risks inherent in investing in the securities of foreign issuers, which include market, political, currency and regulatory risk, by investing in ADRs rather than directly in securities of foreign issuers, the Funds may avoid currency risks during the settlement period for purchases or sales. In general, there is a large, liquid market in the United States for many ADRs. The information available for ADRs is subject to the accounting, auditing and financial reporting standards of the domestic market exchange on which they are traded, in which standards are more uniform and more exacting than those to which many foreign issuers may be subject. The Funds may invest in ADRs sponsored or unsponsored by the issuer of the underlying security. In the case of an

unsponsored ADR, the Funds may bear higher expenses and encounter greater difficulty in receiving shareholder communications than they would have with a sponsored ADR.

The Funds, except for Driehaus Micro Cap Growth Fund, may invest in other forms of depository receipts including European Depository Receipts and Global Depository Receipts, which may be issued in bearer form and denominated in other currencies and are generally designed for use in securities markets outside the U.S. The underlying shares are held in trust by a custodian bank or similar financial institution in the issuer’s home country. The depository bank may not have physical custody of the underlying securities at all times and may charge fees for various services, including forwarding dividends and interest and corporate actions.

Currency Hedging. To the extent a Fund invests in foreign securities, the value of a Fund in U.S. dollars is subject to fluctuations in the exchange rate between foreign currencies and the U.S. dollar. When, in the opinion of the Adviser, it is desirable to limit or reduce exposure in a foreign currency, a Fund may enter into a forward currency exchange contract to sell such foreign currency (or another foreign currency that acts as a proxy for that currency) (“forward currency contract”). Through the contract, the U.S. dollar value of certain underlying foreign portfolio securities can be approximately matched by an equivalent U.S. dollar liability. This technique is known as “currency hedging.” By locking in a rate of exchange, currency hedging is intended to moderate or reduce the risk of change in the U.S. dollar value of a Fund during the period of the forward contract. A default on a contract would deprive the Fund of unrealized profits or force the Fund to cover its commitments for purchase or sale of currency, if any, at the current market price.

The use of forward currency contracts (for transaction or portfolio hedging) will not eliminate fluctuations in the prices of portfolio securities or prevent loss if the price of such securities should decline. In addition, such forward currency contracts will diminish the benefit of the appreciation in the U.S. dollar value of that foreign currency.

Settlement Transactions. If a Fund trades a foreign security, it is usually required to settle the purchase transaction in the relevant foreign currency or receive the proceeds of the sale in that currency. At or near the time of the transaction, a Fund may wish to lock in the U.S. dollar value at the exchange rate or rates then prevailing between the U.S. dollar and the currency in which the security is denominated. Transaction hedging may be accomplished on a forward basis, whereby a Fund purchases or sells a specific amount of foreign currency, at a price set at the time of the contract, for receipt or delivery at either a specified date or at any time within a specified time period. Transaction hedging also may be accomplished by purchasing or selling such foreign currencies on a “spot,” or cash, basis. In so doing, a Fund will attempt to insulate itself against possible losses and gains resulting from a change in the relationship between the U.S. dollar and the foreign currency during the period between the date the security is purchased or sold and the date on which payment is made or received and the transaction settled. Similar transactions may be entered into by using other currencies. A Fund may also settle certain trades in U.S. dollars. The use of currency transactions can result in a Fund incurring losses as a result of a number of factors, including the imposition of exchange controls, suspension of settlements or the inability to deliver or receive a specified currency.

Derivatives. In seeking to achieve its desired investment objective, provide additional revenue or hedge against changes in security prices, interest rates or currency fluctuations, each Fund may: (1) purchase and write both call options and put options on securities, indices and foreign currencies; (2) enter into interest rate, index and foreign currency futures contracts; (3) write options on such futures contracts; (4) purchase other types of forward or investment contracts linked to individual securities, indices or other benchmarks; and (5) enter into various equity or interest rate transactions, participation notes, swaps, caps, floors or collars, and may enter into various currency transactions such as deliverable and non-deliverable foreign currency forward contracts, currency futures contracts, currency swaps or options on currencies (“derivatives”). For these purposes, forward currency contracts are not considered “derivatives.” Each Fund may write a call or put option only if the option is covered. As the writer of a covered call option, each Fund forgoes, during the option’s life, the opportunity to profit from increases in market value of the security covering the call option above the sum of the premium and the exercise price of the call. There can be no assurance that a liquid market will exist when a Fund seeks to close out a position. In addition, because futures positions may require low margin deposits, the use of futures contracts involves a high degree of leverage and may result in losses in excess of the amount of the margin deposit.

The successful use of derivatives depends on the Adviser’s ability to correctly predict changes in the levels and directions of movements in currency exchange rates, security prices, interest rates and other market factors affecting

the derivative itself or the value of the underlying asset or benchmark. In addition, correlations in the performance of an underlying asset to a derivative may not be well established. Finally, privately negotiated and over-the-counter derivatives may not be as well regulated, may be less marketable than exchange-traded derivatives and may be subject to greater risks such as counterparty risks (e.g., counterparty is unable or unwilling to honor the contract).

With respect to equity index futures contracts entered into by a Fund, there are significant differences between the securities and futures markets that could result in an imperfect correlation between the markets, causing a given transaction not to achieve its objectives. The degree of imperfection of correlation depends on circumstances such as variations in speculative market demand for futures, futures options and the related securities, including technical influences in futures and futures options trading and differences between the securities markets and the securities underlying the standard contracts available for trading. For example, the composition of the index, including the issuers and the weighting of each issue, may differ from the composition of the Fund’s portfolio.

Swap agreements typically involve a small investment of cash relative to the magnitude of risks assumed. As a result, they can be highly volatile and may have a considerable impact on a Fund’s performance. The Fund bears the risk of loss of the amount expected to be received under a swap agreement in the event of the default or bankruptcy of a counterparty. In addition, if the counterparty’s creditworthiness declines, the value of a swap will likely decline, potentially resulting in losses for the Fund. The Fund may also suffer losses if it is unable to terminate outstanding swaps (either by assignment or other disposition). It is possible that developments in the swaps market, including additional government regulation, could adversely affect the Fund’s ability to terminate existing swap agreements or to realize amounts to be received under such agreements.

In addition to the risks applicable to derivatives generally, credit default swaps involve special risks because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuers of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). If the Fund is a buyer of a credit default swap agreement, the Fund segregates the value of the remaining premium due to cover its future obligation to the counterparty. If the Fund is a seller of a credit default swap agreement, the Fund segregates the full notional value of the credit default swap agreement to cover its potential obligation to the counterparty.

Illiquid Securities. Each Fund may invest up to 15% of its net assets in illiquid securities. Not readily marketable, illiquid securities include restricted securities and repurchase obligations maturing in more than seven days. Certain restricted securities that may be resold to institutional investors under Rule 144A under the Securities Act of 1933 and Section 4(2) commercial paper may be deemed liquid under guidelines adopted by the Board of Trustees. The absence of a trading market can make it difficult to ascertain a market value for illiquid or restricted securities. Disposing of illiquid or restricted securities may involve time-consuming negotiations and legal expenses, and it may be difficult or impossible for a Fund to sell them promptly at an acceptable price.

The Funds’ Board has adopted liquidity determination procedures (“Liquidity Procedures”) for the Funds that delegate the responsibility for determining the liquidity status of all securities and other instruments held by the Fund to the Fund’s investment adviser consistent with applicable guidance. The Liquidity Procedures provide for active monitoring of portfolio liquidity by the Fund’s investment adviser with quarterly reporting to the Board.

P-Notes. The Driehaus Emerging Markets Growth Fund, Driehaus Emerging Markets Small Cap Growth Fund, Driehaus Frontier Emerging Markets Fund and Driehaus International Small Cap Growth Fund may utilize participatory notes (commonly known as “P-Notes”) in circumstances where a Fund cannot obtain direct access to a foreign stock market. If a Fund buys such derivative instruments, it is subject to the risk of the inability or refusal to perform of the counterparty to the transaction. As the purchaser of a P-Note, a Fund is relying on the creditworthiness of the counterparty issuing the P-Note and does not have the same rights under a P-Note as it would as a shareholder of the underlying issuer. Therefore, if a counterparty becomes insolvent, a Fund could lose the total value of its investment in the P-Note. In addition, there is no assurance that there will be a trading market for a P-Note.

Convertible Securities. While convertible securities purchased by the Funds are frequently rated investment grade, a Fund also may purchase unrated convertible securities or convertible securities rated below investment grade if the securities meet the Adviser’s other investment criteria. Each Fund does not currently intend to invest more than 5% of its total assets in below investment grade convertible securities. Convertible securities rated below investment grade

(a) tend to be more sensitive to interest rate and economic changes, (b) may be obligations of issuers who are less creditworthy than issuers of higher quality convertible securities, and (c) may be more thinly traded due to such securities being less well known to investors than either common stock or conventional debt securities. As a result, the Adviser’s own investment research and analysis tends to be more important in the purchase of such securities than other factors.

Debt Securities Risks. Each Fund may invest up to 20% of their total assets in nonconvertible debt securities. Investments in such debt securities are limited to those that are rated within the four highest grades (generally referred to as “investment grade”) assigned by a nationally or internationally recognized statistical rating organization. Investments in unrated debt securities are limited to those deemed to be of comparable quality as analyzed by the Adviser under its own procedures. Securities in the fourth-highest grade may possess speculative characteristics. If the rating of a security held by a Fund is lost or reduced below investment grade, the Fund is not required to dispose of the security. The Adviser will, however, consider that fact in determining whether a Fund should continue to hold the security. The risks inherent in a debt security depend primarily on its term and quality, as well as on market conditions. A decline in the prevailing levels of interest rates generally increases the value of debt securities. Conversely, an increase in rates usually reduces the value of debt securities.

Debt securities may be subject to credit risk, interest rate risk, prepayment and extension risk as well as call risk. Credit risk is the failure of an issuer or borrower to make timely interest or principal payments, or a decline or perception of a decline in the credit quality of a bond or creditworthiness of a borrower, which can cause the security’s price to fall, potentially lowering a Fund’s share price. Prices of bonds tend to move inversely with changes in interest rates. Typically, a rise in rates will adversely affect bond prices and, accordingly, a Fund’s share price. The longer a debt security’s effective maturity and duration, the more its price is likely to react to interest rates. Interest rate changes normally have different effects on variable or floating rate securities than they do on securities with fixed interest rates. When interest rates fall, debt securities may be repaid more quickly than expected and a Fund may be required to reinvest the proceeds at a lower interest rate. This is referred to as “prepayment risk.” When interest rates rise, debt securities may be repaid more slowly than expected and the value of a Fund’s holdings may fall sharply. This is referred to as “extension risk.” If an issuer “calls” its bond before its maturity date during a time of declining interest rates, a Fund might have to reinvest the proceeds in an investment offering a lower yield.

Sovereign Debt Risk. The Driehaus Frontier Emerging Markets Fund may invest in sovereign debt instruments. Sovereign debt securities are subject to various risks in addition to those relating to debt securities and foreign securities generally, including, but not limited to, the risk that a governmental entity may be unwilling or unable to pay interest and repay principal on its sovereign debt, or otherwise meet its obligations when due because of cash flow problems, insufficient foreign reserves, the relative size of the debt service burden to the economy as a whole, the government’s policy towards principal international lenders such as the International Monetary Fund, or the political considerations to which the government may be subject. If a sovereign debtor defaults (or threatens to default) on its sovereign debt obligations, the indebtedness may be restructured. Some sovereign debtors have in the past been able to restructure their debt payments without the approval of some or all debt holders or to declare moratoria on payments. In the event of a default on sovereign debt, the Fund may also have limited legal recourse against the defaulting government entity.

The Driehaus Frontier Emerging Markets Fund may enter into forward contracts, futures and options contracts and swap agreements to provide economic exposure similar to investments in sovereign frontier emerging market debt or for hedging purposes. Derivatives can be highly volatile, illiquid and difficult to value. Certain types of derivatives, including swap agreements, forward contracts and other over-the-counter transactions, involve greater risks than the underlying obligations because, in addition to general market risks, they are subject to illiquidity risk, counterparty risk, credit risk and pricing risk.

Investment Companies. Each Fund may invest in domestic investment companies and with the exception of the Driehaus Micro Cap Growth Fund, foreign investment companies. Some countries may not permit direct investment by outside investors. Investments in such countries may only be permitted through foreign government-approved or government-authorized investment vehicles, which may include other investment companies. In addition, it may be less expensive and more expedient for a Fund to invest in a foreign investment company in a country that permits direct foreign investment; similarly, a Fund may invest in a money market fund in order to receive a higher rate of

return or to be more productively invested than would be possible through direct investment in money market instruments. Investing through such vehicles may involve layered fees or expenses. The Funds do not intend to invest in such investment companies unless, in the judgment of the Adviser, the potential benefits of such investments justify the payment of any associated fees or expenses.

Repurchase Agreements. Each Fund may invest in repurchase agreements, provided that it will not invest more than 15% of its net assets in repurchase agreements maturing in more than seven days and any other illiquid securities. A repurchase agreement involves the sale of securities to a Fund, with the concurrent agreement of the seller to repurchase the securities at the same price plus an amount representing interest at an agreed-upon interest rate within a specified period of time, usually less than one week, but, on occasion, at a later time. Repurchase agreements entered into by a Fund will be fully collateralized and will be marked-to-market daily. In the event of a bankruptcy or other default of a seller of a repurchase agreement, a Fund could experience both delays in liquidating the underlying securities and losses, including: (a) possible decline in the value of the collateral during the period while the Fund seeks to enforce its rights thereto; (b) possible subnormal levels of income and lack of access to income during this period; and (c) expenses of enforcing its rights.

When-Issued and Delayed-Delivery Securities; Reverse Repurchase Agreements. Each Fund may purchase or sell securities on a when-issued or delayed-delivery basis. Although the payment and interest terms of these securities are established at the time the Fund enters into the commitment, the securities may be delivered and paid for a month or more after the date of purchase, when their value may have changed. The Fund makes such purchase commitments only with the intention of actually acquiring the securities, but may sell the securities before the settlement date if the Adviser deems it advisable for investment reasons. The Driehaus Emerging Markets Growth Fund, Driehaus Emerging Markets Small Cap Growth Fund and Driehaus International Small Cap Growth Fund may utilize spot and forward foreign currency exchange transactions to reduce the risk inherent in fluctuations in the exchange rate between one currency and another when securities are purchased or sold on a when-issued or delayed-delivery basis.

Each Fund may enter into reverse repurchase agreements with banks and securities dealers. A reverse repurchase agreement is a repurchase agreement in which a Fund is the seller of, rather than the investor in, securities and agrees to repurchase them at an agreed-upon time and price. Use of a reverse repurchase agreement may be preferable to a regular sale and later repurchase of securities because it avoids certain market risks and transaction costs.

At the time a Fund enters into a binding obligation to purchase securities on a when-issued basis or enters into a reverse repurchase agreement, liquid assets (cash, U.S. government securities or other “high-grade” debt obligations) of the Fund having a value at least as great as the purchase price of the securities to be purchased will be earmarked or segregated on the books of the Fund and held by the custodian throughout the period of the obligation. The use of these investment strategies, as well as borrowing under a line of credit, may increase net asset value fluctuation.

Lending Portfolio Securities. Each Fund may lend its portfolio securities to broker-dealers and banks, provided that it may not lend securities if, as a result, the aggregate value of all securities loaned would exceed 33 1/3% of its total assets. Any such loan must be continuously secured by collateral (cash or U.S. government securities). In the event of bankruptcy or other default of the borrower, a Fund could experience delays in both liquidating the loan collateral and recovering the loaned securities and losses.

Disclosure of Portfolio Holdings. A description of the Funds’ policies and procedures with respect to the disclosure of the Funds’ portfolio securities is available in the SAI. The Funds’ portfolio holdings information is available at www.driehaus.com.

Trustees and Adviser. The Board of Trustees of the Trust has overall management responsibility. See the SAI for the names of and additional information about the Trustees and officers. The Adviser, Driehaus Capital Management LLC, 25 East Erie Street, Chicago, Illinois 60611, is responsible for providing investment advisory and management services to the Funds, subject to the direction of the Board of Trustees. The Adviser is registered as an investment adviser under the Investment Advisers Act of 1940, as amended. The Adviser was organized in 1982 and as of March 31, 2016, managed approximately $8.4 billion in assets.

Each Fund paid the Adviser an annual investment management fee on a monthly basis as follows for the fiscal year ended December 31, 2015. These fees are higher than the fees paid by most mutual funds.

¹ Beginning on May 1, 2016, the Driehaus Emerging Markets Growth Fund will pay the Adviser an annual management fee on a monthly basis as follows: 1.50% of average daily net assets up to $1.5 billion, 1.00% of average daily net assets on the next $500 million and 0.75% of average daily net assets in excess of $2.0 billion.

² The Adviser has entered into a contractual agreement to waive a portion of its management fee and to reimburse operating expenses to the extent necessary to cap the Driehaus Frontier Emerging Markets Fund’s ordinary annual operating expenses (excluding interest, taxes, brokerage commissions and other investment-related costs and extraordinary expenses) at 2.00% of average daily net assets until the earlier of the termination of the investment advisory agreement or May 3, 2018. Pursuant to this agreement, and so long as the investment advisory agreement is in place, for a period of three years subsequent to the Fund’s commencement of operations on May 4, 2015, the Adviser is entitled to reimbursement for previously waived fees and reimbursed expenses to the extent that the Fund’s expense ratio remains below the operating expense cap that was in place at the time of the waiver as well as the existing operating expense cap. Because of this agreement, the Fund may pay the Adviser less than the contractual management fee.

³ The Adviser has entered into a contractual agreement to waive a portion of its management fee and to reimburse operating expenses to the extent necessary to cap the Driehaus Micro Cap Growth Fund’s ordinary annual operating expenses (excluding interest, taxes, brokerage commissions, other investment-related costs and extraordinary expenses) at 1.70% of average daily net assets until the earlier of the termination of the investment advisory agreement by the Board of Trustees or the Fund’s shareholders or November 18, 2016. Pursuant to the agreement, and so long as the investment advisory agreement is in place, for a period of three years subsequent to the Fund’s commencement of operations on November 18, 2013, the Adviser is entitled to reimbursement for previously waived fees and reimbursed expenses to the extent that the Fund’s expense ratio remains below the operating expense cap that was in place at the time. Because of this agreement, the Fund may pay the Adviser less than the contractual management fee.

Disclosure relating to the material factors and the conclusions with respect to those factors that formed the basis for the Board of Trustees’ continuation of the investment advisory agreement for each Fund may be reviewed in the Funds’ annual report to shareholders for the fiscal year ended December 31, 2015. Shareholder reports may be obtained by calling 1-800-560-6111, or by visiting www.driehaus.com or the SEC’s web site at www.sec.gov.

The Funds enter into contractual arrangements with various parties, including, among others, the Funds’ investment adviser, who provide services to the Funds. Shareholders are not parties to, or intended (or “third-party”) beneficiaries of those contractual arrangements.

The Prospectus and the SAI provide information concerning the Funds that you should consider in determining whether to purchase shares of the Funds. The Funds may make changes to this information from time to time. Neither this Prospectus nor the SAI is intended to give rise to any contract rights in any shareholder, other than any rights conferred explicitly by federal or state securities laws that may not be waived.

Lead Portfolio Manager. Howard Schwab has been a portfolio manager of the Driehaus Emerging Markets Growth Fund since January 1, 2008 and became the lead portfolio manager on May 1, 2012. Mr. Schwab has responsibility for making investment decisions on behalf of the Fund.

Mr. Schwab joined the Adviser in 2001 upon completion of his B.A. degree in Economics from Denison University. Mr. Schwab is also a Portfolio Manager for the Driehaus Emerging Markets Small Cap Growth Fund. Prior to assuming portfolio manager responsibilities for certain of the Adviser’s international strategies, Mr. Schwab was an international equity analyst for the Adviser.

Portfolio Manager. Chad Cleaver has been a portfolio manager of the Driehaus Emerging Markets Growth Fund since May 1, 2012. Mr. Cleaver served as the assistant portfolio manager of the Fund from May 1, 2008 to May 1, 2012. Mr. Cleaver has responsibility for making investment decisions on behalf of the Fund.

Mr. Cleaver is also the lead portfolio manager for the Driehaus Emerging Markets Small Cap Growth Fund and portfolio manager of Driehaus Frontier Emerging Markets Fund. Mr. Cleaver received his A.B. in Economics in 2000 from Wabash College. He earned his M.B.A. degree in 2004 from the Kenan-Flagler Business School at the University of North Carolina at Chapel Hill. He began his career with the Board of Governors of the Federal Reserve System. He joined the Adviser in 2004 as an investment analyst to the Fund prior to assuming assistant portfolio management responsibilities on May 1, 2008.

Portfolio Manager. Richard Thies has been a portfolio manager of the Driehaus Emerging Markets Growth Fund since May 1, 2016. Mr. Thies served as an assistant portfolio manager of the Fund from May 1, 2014 to April 30, 2016. He has responsibility for making investment decisions on behalf of the Fund.

Mr. Thies is also a portfolio manager of Driehaus Emerging Markets Small Cap Growth Fund and Driehaus Frontier Emerging Markets Fund. Mr. Thies received his B.A. in international studies from Emory University and his M.A. focused in international political economy from the University of Chicago Booth School of Business. Mr. Thies began his career at the International Finance Corporation of the World Bank Group in 2005. In 2008, Mr. Thies worked for Opportunity International as a proposal writer. He then worked as an associate international economist for The Northern Trust in 2009. Mr. Thies joined the Adviser as a macro analyst in 2011. He was also an assistant portfolio manager of the Driehaus Frontier Emerging Markets Fund from May 4, 2015 to April 30, 2016.

Lead Portfolio Manager. Chad Cleaver has managed the Driehaus Emerging Markets Small Cap Growth Fund since its inception in August, 2011 and became the lead portfolio manager on May 1, 2012. Mr. Cleaver was the assistant portfolio manager for the Driehaus Emerging Markets Small Cap Growth Fund, L.P., the predecessor limited partnership to the Driehaus Emerging Markets Small Cap Growth Fund, since it commenced operations on December 1, 2008. Mr. Cleaver has responsibility for making investment decisions on behalf of the Fund. Mr. Cleaver’s background is described under “Driehaus Emerging Markets Growth Fund — Portfolio Manager.”

Portfolio Manager. Howard Schwab has managed the Driehaus Emerging Markets Small Cap Growth Fund since its inception in August, 2011. Mr. Schwab was the portfolio manager for the Driehaus Emerging Markets Small Cap Growth Fund, L.P., the predecessor limited partnership to the Driehaus Emerging Markets Small Cap Growth Fund, since it commenced operations on December 1, 2008. Mr. Schwab has responsibility for making investment decisions on behalf of the Fund. Mr. Schwab’s background is described under “Driehaus Emerging Markets Growth Fund — Lead Portfolio Manager.”

Portfolio Manager. Richard Thies has been a portfolio manager of the Driehaus Emerging Markets Small Cap Growth Fund since May 1, 2016. Mr. Thies has responsibility for making investment decisions on behalf of the Fund. Mr. Thies’s background is described under “Driehaus Emerging Markets Growth Fund — Portfolio Manager”.

Assistant Portfolio Manager. Trent DeBruin has been an assistant portfolio manager of the Driehaus Emerging Markets Small Cap Growth Fund since May 1, 2014. He has investment decision-making responsibilities for the Fund, subject to approval of Mr. Cleaver or Mr. Thies.

Mr. DeBruin received his B.A. in finance from the University of Notre Dame and earned his M.B.A. from the University of Chicago Booth School of Business. He began his career at Driehaus Capital Management in 2007 as an associate analyst.

Portfolio Manager. Chad Cleaver is a portfolio manager of the Driehaus Frontier Emerging Markets Fund, a position he has held since the Fund’s inception. Mr. Cleaver has responsibility for making investment decisions on behalf of the Fund. Mr. Cleaver’s background is described under “Driehaus Emerging Markets Growth Fund — Portfolio Manager.”

Portfolio Manager. Richard Thies is a portfolio manager of the Driehaus Frontier Emerging Markets Fund, a position he has held since May 1, 2016. Mr. Thies served as the assistant portfolio manager of the Fund from May 4, 2015 to April 30, 2016. Mr. Thies has responsibility for making investment decisions on behalf of the Fund. Mr. Thies’ background is described under “Driehaus Emerging Markets Growth Fund — Portfolio Manager.”

Lead Portfolio Manager. David Mouser has assisted in the management of Driehaus International Small Cap Growth Fund since its inception on September 17, 2007 and became the lead portfolio manager on May 1, 2012. Mr. Mouser is responsible for making investment decisions on behalf of the Fund. Since September, 2005, Mr. Mouser was the assistant portfolio manager for the Driehaus International Opportunities Fund, L.P., the predecessor limited partnership to the Fund.

Mr. Mouser joined the Adviser in 1999 upon completion of his B.S. degree in Finance from the University of Dayton. Prior to assuming portfolio management responsibilities, Mr. Mouser was an investment analyst with the Adviser.

Portfolio Manager. Daniel Burr has been a portfolio manager for the Driehaus International Small Cap Growth Fund since May 1, 2014. He has responsibility for making investment decisions on behalf of the Fund.

Mr. Burr received his B.S. in applied economics and business management from Cornell University in 2000 and completed his M.B.A. in 2006 with concentrations in finance and accounting from the University of Chicago Booth School of Business. Mr. Burr began his career at First Manhattan Consulting Group as an analyst from 2000 to 2001. Prior to joining Driehaus in 2013, Mr. Burr worked at Oberweis Asset Management, leaving with the title of senior international equity analyst. He joined the Adviser in 2013 as an investment analyst to the Fund prior to becoming portfolio manager.

Assistant Portfolio Manager. Ryan Carpenter has been the assistant portfolio manager of the Driehaus International Small Cap Growth Fund since May 1, 2010. He has investment decision-making responsibilities for the Fund, subject to Messrs. Mouser’s and Burr’s approval.

Mr. Carpenter joined the Adviser in 2007 upon completion of his B.A. degree in Finance from the University of Illinois at Chicago. Mr. Carpenter is also the Portfolio Manager for the Adviser’s International Realty strategy. Prior to assuming portfolio management responsibilities, Mr. Carpenter was an investment analyst with the Adviser.

Portfolio Manager. The Driehaus Micro Cap Growth Fund is managed by Jeffrey James. Mr. James has been the Portfolio Manager for the Fund since its inception and is responsible for making investment decisions on behalf of the Fund. Mr. James was the portfolio manager for the Driehaus Micro Cap Fund, L.P. since 1998 and the portfolio manager for the Driehaus Institutional Micro Cap Fund, L.P. since its inception. These are the predecessor limited partnerships to the Fund.

Mr. James received his B.S. in Finance from Indiana University in 1990 and an M.B.A. from DePaul University in 1995. He began his career with Lehman Brothers in 1990. From 1991 through 1997, Mr. James worked at the Federal Reserve Bank of Chicago as an analyst. In 1997, Mr. James joined the Adviser as a sector analyst covering the information technology and energy sectors. In 1998, he assumed portfolio management duties for the Adviser’s Micro Cap Growth Strategy and in 2006 for the Adviser’s Small Cap Growth Strategy.

Assistant Portfolio Manager. Michael Buck is the assistant portfolio manager of the Driehaus Micro Cap Growth Fund, a position he has held since the Fund’s inception. In this role, he supports Mr. James with investment research, security selection and portfolio construction. Mr. Buck has investment decision-making responsibilities for the Fund, subject to Mr. James’s approval. Mr. Buck was the assistant portfolio manager of the Driehaus Micro Cap Fund, L.P. since January 1, 2009 and the Driehaus Institutional Micro Cap Fund, L.P. since its inception.

Mr. Buck received a B.A. in Economics and Cello Performance from Northwestern University in 2000. Mr. Buck began his career in 2001 with Deloitte Consulting. In 2002, he joined the Adviser, where he also serves as a senior research analyst focusing on U.S. micro-cap and small-cap stocks within the consumer discretionary, consumer staples and financials sectors. Mr. Buck is the assistant portfolio manager for the Adviser’s Micro Cap Growth Strategy and for the Adviser’s Small Cap Growth Strategy.

The SAI provides additional information about the portfolio managers’ and assistant portfolio managers’ compensation, other accounts managed, and ownership of securities in the Funds.

Distributor. Driehaus Securities LLC (“DS LLC”), an affiliate of the Adviser, acts as the distributor of the Trust’s shares pursuant to a Distribution Agreement, without any sales concessions or charges to the Funds or to their shareholders.

Administrator. BNY Mellon Investment Servicing (US) Inc. (“BNY Mellon”) is the administrator for the Funds. In such capacity, BNY Mellon assists the Funds in aspects of their administration and operation, including certain accounting services.

Transfer Agent. BNY Mellon is the agent of the Funds for the transfer of shares, disbursement of dividends and maintenance of shareholder account records.

Custodian. The Northern Trust Company (the “Custodian”) is the custodian for the Funds. Foreign securities are maintained in the custody of foreign banks and trust companies that are members of the Custodian’s global custody network or foreign depositories used by such members.

Each Fund’s net asset value is determined as of the close of the New York Stock Exchange (“NYSE”) (normally 3:00 p.m., Central time) on each day the NYSE is open for trading. Purchases and redemptions are made at a Fund’s net asset value per share next calculated after receipt of your purchase or redemption order in good form. Net asset value per share is determined by dividing the difference between the values of a Fund’s assets and liabilities by the number of its shares outstanding. The Funds’ holdings are typically valued using readily available market quotations and portfolio currency positions are based on exchange rates provided by an independent pricing service. Securities and foreign currencies may be valued by the Adviser’s Pricing Committee or an independent pricing service as described below, using methods approved by the Board of Trustees when: (i) securities cannot be priced through a readily available market quotation provided by a pricing service and no broker-dealer quotations are available or are determined not to be reasonable, or (ii) an event occurs that affects the value of a portfolio security between the time its price is determined in its local market or exchange and the close of the NYSE where the event would materially affect net asset value.

The Driehaus Emerging Markets Growth Fund, Driehaus Emerging Markets Small Cap Growth Fund, Driehaus Frontier Emerging Markets Fund and Driehaus International Small Cap Growth Fund use an independent pricing service to provide fair value estimates for relevant foreign equity securities on days when the U.S. market movement exceeds a certain threshold. This pricing service uses correlations between the movement of prices of foreign equity securities and indices of U.S. traded securities and other indicators, such as closing prices of American Depository Receipts and futures contracts, to determine the fair value of relevant foreign equity securities. In such cases, a Fund’s value for a security is likely to be different from the last quoted market price. In addition, due to the subjective and variable nature of fair value pricing, it is possible that the value determined for a particular security may be materially different from the value realized upon the security’s sale. Because foreign securities markets may operate on days that are not business days in the U.S., the value of a Fund’s holdings may change on days when you will not be able to purchase or redeem the Funds’ shares.

The Driehaus Frontier Emerging Markets Fund has the following minimum investments, which may be waived at the discretion of DS LLC:

The Funds seek to obtain identification information for new accounts so that the identity of Fund investors can be verified consistent with regulatory requirements. The Funds may limit account activity until investor identification information can be verified. If the Funds are unable to obtain sufficient investor identification information such that the Funds may form a reasonable belief as to the true identity of an investor, the Funds may take further action including closing the account.

for Fund share purchases under $100,000. For purchases of $100,000 or more, the Funds accept only wire transfers.

Driehaus Mutual Funds will not accept the following forms of payment for Fund shares:

Any expense incurred as a result of a returned check will be borne by the shareholder. The Fund will charge a $20 fee against your account, in addition to any loss sustained by the Fund, for any check returned for insufficient funds. If you are adding to your existing account, fill out the detachable investment slip from an account statement or indicate your Fund account number and the name(s) in which the account is registered directly on the check. Send to:

New investors who would like to participate in the Automatic Investment Plan or make additional investments in shares of the Funds by ACH should complete the appropriate section of the account application and mail it to Driehaus Mutual Funds at the address included in the “By Mail” section above. Current investors should complete the Optional Account Services Form to add either or both privileges to their account(s). To obtain either form, call Shareholder Services at 1-800-560-6111 or visit www.driehaus.com.

Financial institutions that enter into a sales agreement with DS LLC or the Trust (“Intermediaries”) may accept purchase and redemption orders on behalf of the Funds. If communicated in accordance with the terms of the sales agreement, a purchase or redemption order will be deemed to have been received by the Funds when the Intermediary accepts the order. In certain instances, an Intermediary (including Charles Schwab & Co., Inc.) may designate other third-party financial institutions (“Sub-Designees”) to receive orders from their customers on the Funds’ behalf. The Intermediary is liable to the Funds for its compliance with the terms of the sales agreement and the compliance of each Sub-Designee. All orders will be priced at the applicable Fund’s net asset value next computed after they are accepted by the Intermediary or Sub-Designee, provided that such orders are communicated in accordance with the terms of the applicable sales agreement.

Certain Intermediaries may enter purchase orders on behalf of their customers by telephone, with payments to follow within several days as specified in their sales agreement. Such purchase orders will be effected at the net asset value next determined after receipt of the telephone purchase order. It is the responsibility of the Intermediary to place the order on a timely basis. If payment is not received within the time specified in the agreement, the Intermediary could be held liable for any fees or losses resulting from the cancellation of the order.

Shares of each Fund are offered only to residents of states and other jurisdictions in which the shares are available for purchase. The Funds do not generally sell shares to persons or entities, including foreign financial institutions, foreign shell banks and private banking accounts, residing outside the U.S., its territories and possessions, even if they are U.S. citizens or lawful permanent residents, except to persons with U.S. military APO or FPO addresses. However, under limited circumstances, the Funds reserve the right to sell shares to such persons or entities residing outside of the U.S., its territories and possessions. The Funds reserve the right not to accept any purchase order. The Funds also reserve the right to change their investment minimums without notice. For all purchases, confirmations are sent to the investor in writing except purchases made by reinvestment of dividends, which will be confirmed quarterly.

“Buying a Dividend.” Unless you are purchasing Fund shares through a tax-advantaged account (such as an IRA), buying Fund shares at a time when a Fund has substantial undistributed income or gains can cost you money in taxes. See “Distributions and Taxes — Buying a Distribution” below. Contact the Fund for information concerning when distributions will be paid.

Shares Purchased by Check or ACH. Shares purchased by check are subject to a 10 business day escrow period to ensure payment to the relevant Fund. Shares purchased by ACH are subject to a 5 business day escrow period to ensure payment to the relevant Fund. The proceeds of shares redeemed during the escrow period will be released after expiration of the escrow period.

Driehaus International Small Cap Growth Fund. The Driehaus International Small Cap Growth Fund is closed to new investors. You may purchase Driehaus International Small Cap Growth Fund shares and reinvest dividends and capital gains you receive on your holdings of Fund shares in additional shares of the Fund if you are:

You may open a new account in the Driehaus International Small Cap Growth Fund if you:

These restrictions apply to investments made directly through Driehaus Securities LLC, the Fund’s distributor, as well as investments made through intermediaries. Intermediaries that maintain omnibus accounts are not allowed to open new sub-accounts for new investors, unless the investor meets the criteria listed above. Once an account is closed, additional investments will not be accepted unless you meet the criteria listed above. Investors may be required to demonstrate eligibility to purchase shares of the Fund before an investment is accepted. The Fund reserves the right to (i) eliminate any of the exceptions listed above and impose additional restrictions on purchases of Fund shares; and (ii) make additional exceptions that, in its judgment, do not adversely affect the Adviser’s ability to manage the Fund.

Certain requests for redemption must be signed by the shareholder with a signature guarantee. See “Shareholder Services and Policies — Medallion Signature Guarantees.” Redemption proceeds will be net of any applicable redemption fees.

Telephone Transactions. For your protection, telephone requests may be recorded in order to verify their accuracy. Also for your protection, telephone transactions are not permitted on accounts whose address has changed within the past 30 days. Proceeds from telephone transactions can only be mailed to the address of record or wired or electronically transferred to a bank account previously designated by you in writing.

Institutional and Fiduciary Account Holders. Institutional and fiduciary account holders, such as corporations, custodians, executors, administrators, trustees or guardians, must submit, with each request, a completed certificate of authorization in a form of resolution acceptable to the Funds. The request must include other supporting legal documents as required from organizations, executors, administrators, trustees or others acting on accounts not registered in their names. For more information, please contact Shareholder Services at 1-800-560-6111.

Cancellation. A shareholder may not cancel or revoke a redemption order once instructions have been received and accepted. The Funds cannot accept a redemption request that specifies a particular date or price for redemption or any special conditions.

Redemptions by the Funds. The Funds reserve the right to redeem shares in any account and send the proceeds to the owner if, immediately after a redemption, the shares in the account do not have the Minimum Account Value as shown below:

A shareholder would be notified that the account is below the minimum and would have 30 days to increase the account before the account is redeemed.

In-Kind Redemptions. The Funds generally intend to pay all redemptions in cash. However, the Funds may pay you for shares you sell by “redeeming in kind,” that is, by giving you marketable securities, if your requests over a 90-day period total more than $250,000 or 1% of the net assets of the relevant Fund, whichever is less. An in-kind redemption is taxable for federal income tax purposes in the same manner as a redemption for cash.

Execution of Requests. If an order is placed prior to the close of regular trading on the NYSE (normally 3:00 p.m., Central time) on any business day, the purchase of shares is executed at the net asset value determined as of the closing time that day. If the order is placed after that time, it will be effected on the next business day.

A redemption order will be executed at the price which is the net asset value determined after proper redemption instructions are received, minus the redemption fee, if applicable. The redemption price received depends upon the Fund’s net asset value per share at the time of redemption and any applicable redemption fee. Therefore, it may be more or less than the price originally paid for the shares and may result in a realized capital gain or loss for federal income tax purposes.

Each Fund will deduct a redemption fee of 2.00% from the redemption amount for shareholders who sell their shares within 60 days of purchase. This fee is paid to the Fund and is designed to offset the commission costs, market impact costs, tax consequences to the Fund, and other costs associated with fluctuations in Fund asset levels and cash flow caused by short-term shareholder trading. Redemption fees may be waived in certain circumstances (see “Policies and Procedures Regarding Frequent Purchases and Redemptions” below).

For shareholders who purchased shares on different days, the shares held the longest will be redeemed first for purposes of determining whether the redemption fee applies. The redemption fee does not apply to shares that were acquired through reinvestment of distributions.

The Funds will pay redemption proceeds, less any applicable fees (including redemption fees), as follows:

If it is in the best interest of the Funds to do so, the Funds may take up to seven days to pay proceeds from shares redeemed. The redemption price will be determined as of the time proper redemption instructions are received, in the manner described above, even if a Fund delays payment of the proceeds. For payments sent by wire or ACH, the Funds are not responsible for the efficiency of the federal wire or ACH systems or the shareholder’s financial services firm or bank. The shareholder is responsible for any charges imposed by the shareholder’s financial services firm or bank. Payment for shares redeemed within 10 business days after purchase by personal check or 5 business days after purchase by ACH will be delayed until the applicable escrow period has expired. Shares purchased by certified check or wire are not subject to the escrow period.

Frequent and short-term trading in shares of the Funds, known as “market timing,” can harm long-term Fund shareholders. Such short-term trading activity can result in increased costs to the Funds for buying and selling portfolio securities and also can disrupt portfolio management strategies when the Funds need to maintain cash or liquidate portfolio holdings to meet redemptions. The Funds may be particularly susceptible to risks of short-term trading because they invest in foreign securities. Time zone differences among international stock markets may motivate investors to attempt to exploit the use of prices based on closing prices of foreign securities exchanges (“time zone arbitrage”). The Funds’ valuation procedures seek to minimize investors’ ability to engage in time zone arbitrage in the Funds. See “Net Asset Value” above.

The Trust’s Board of Trustees has adopted policies and procedures in an effort to discourage and prevent market timing, which do not accommodate frequent purchases and redemptions of shares. The Trust imposes a 2% redemption fee on redemptions (including exchanges) of Fund shares made within 60 days of their purchase. This redemption fee was imposed to reduce the impact of costs resulting from short-term trading and to deter market timing activity. The Funds waive the redemption fee in certain circumstances, including for certain retirement plan investors, for certain omnibus accounts when the Intermediary collects the fee at the sub-account level and remits it to the Funds, for investors in certain wrap programs and otherwise, at the Funds’ discretion. The Funds reserve the right to modify or terminate these waivers at any time.

The Funds’ Adviser receives trading activity information from the Transfer Agent and monitors Fund inflows and outflows for suspected market timing activity using certain activity thresholds. The Adviser monitors the trading activity of direct shareholders and trading activity through Intermediaries, as well as instances in which the Funds receive a redemption fee from a direct shareholder or Intermediary account. This monitoring may result in the Funds’ rejection or cancellation of future purchase or exchange transactions in that shareholder’s account(s) without prior notice to the shareholder. Under current procedures, such rejection or cancellation would occur within one business day after the Adviser identifies the suspected market timing activity. The Funds also may limit the number of exchanges a shareholder can make between the Funds.

the Funds. Investors who purchase shares through an Intermediary should review any disclosures provided by the Intermediary with which they have an account to determine what frequent trading restrictions may apply to their account. The Funds may direct any Intermediary to block any shareholder account from future trading in the Funds if market timing is suspected or discovered.

Shareholders seeking to engage in market timing activities may use a variety of strategies to avoid detection and, despite the efforts of the Funds to prevent such trading, there is no guarantee that the Funds or Intermediaries will be able to identify these shareholders or curtail their market timing activity.

Exchanging Shares. Any shares of a Fund that you have held for the applicable escrow period may be exchanged for shares of any other Driehaus Mutual Fund in an identically registered account, provided the Fund(s) has (have) the same transfer agent, is (are) available for purchase, the Fund(s) to be acquired is (are) registered for sale in your state of residence and you have met the minimum initial investment requirements. Procedures applicable to the purchase and redemption of a Fund’s shares are also applicable to exchanging shares, including the prices that you receive and pay for the shares you exchange. You will automatically have the ability to exchange shares of any Driehaus Mutual Fund, subject to the qualifications noted above, by telephone unless you indicate on your application that you do not want this privilege. The Funds reserve the right to limit the number of exchanges between Funds and to reject any exchange order. The Funds reserve the right to modify or discontinue the exchange privilege at any time upon 60 days’ written notice. For federal income tax purposes, an exchange is treated the same as a sale and you may recognize a capital gain or loss upon an exchange, depending upon the cost or other basis of the shares exchanged. The 2.00% redemption fee also applies to shareholders who exchange their shares for any other Driehaus Mutual Fund shares within 60 days of purchase.

Medallion Signature Guarantees. A medallion signature guarantee assures that a signature is genuine and protects shareholders from unauthorized account activity. In addition to certain signature requirements, a medallion signature guarantee is required in any of the following circumstances:

At the Funds’ discretion, medallion signature guarantees also may be required for other transactions or changes to your account. A medallion signature guarantee may be obtained from a domestic bank or trust company, broker, dealer, clearing agency or savings association who is a participant in a medallion program recognized by the Securities Transfer Association. The three recognized medallion programs are the Securities Transfer Agents Medallion Program (STAMP), the Stock Exchanges Medallion Program (SEMP), and the New York Stock Exchange, Inc. Medallion Signature Program (MSP). Signature guarantees which are not part of these programs will not be accepted.

Telephone Transactions. Shareholders will automatically have telephone redemption by check and exchange privileges unless they indicate on their account application that they do not want these privileges. Shareholders may initially purchase shares by telephone via bank wire. Shareholders engaging in telephone transactions should be aware of the risks associated with these types of transactions as compared to written requests. Although the Funds employ reasonable procedures to confirm that instructions received by telephone are genuine, a shareholder authorizing a transaction by telephone bears the risk of any resulting losses, unless the Funds or their service providers fail to employ these measures. In such cases, the Funds or their service providers may be liable for losses arising from unauthorized or fraudulent instructions. In addition, the Funds reserve the right to record all telephone conversations. Confirmation statements for telephone transactions should be reviewed for accuracy immediately upon receipt by the shareholder.

Delivery of Written Requests. Neither the U.S. Postal Service nor other independent delivery services are agents of the Funds. Therefore, deposits in the mail or with such services or receipt at the Funds’ post office box of purchase orders and redemption requests do not constitute receipt by the Transfer Agent.

Unusual Circumstances. During times of unusual economic or market changes, telephone redemption and exchange privileges may be difficult to implement. In addition, in unusual circumstances, a Fund may temporarily suspend the processing of redemption requests, or may postpone payment of proceeds for up to seven days or longer as allowed by federal securities laws. In the event that you are unable to reach the Funds by telephone, requests may be mailed to the Funds at the address listed in “How to Redeem Shares.”

A Note on Mailing Procedures. In order to provide greater convenience to our shareholders and cost savings to the Funds by reducing the number of duplicate shareholder mailings, only one copy of most proxy statements, financial reports and prospectuses will be mailed to households, even if more than one person in a household holds shares of a Fund. Separate shareholder statements will continue to be mailed for each Fund account. If you want additional copies or do not want your mailings to be “householded,” please call Shareholder Services at 1-800-560-6111 or write to Driehaus Mutual Funds, P.O. Box 9817, Providence, RI 02940.

Reinvestment of Distributions. Dividends and distributions payable by a Fund are automatically reinvested in additional shares of such Fund unless the investor indicates otherwise on the application or subsequently notifies the Fund, in writing, of the desire to not have dividends automatically reinvested. Reinvested dividends and distributions are treated the same for federal income tax purposes as dividends and distributions received in cash. If the U.S. Postal Service cannot deliver your check or if your check remains uncashed for six months, the Funds reserve the right to reinvest your distribution check in your account at the net asset value on the day of the reinvestment and to reinvest all subsequent distributions in shares of the applicable Fund. Interest will not accrue on amounts represented by uncashed distribution or redemption checks.

Payment of Dividends and Other Distributions. Each Fund pays its shareholders dividends from its investment company taxable income (determined without regard to the deduction for dividends paid), and distributions from any realized net capital gains (i.e., the excess of net long-term capital gains over the sum of net short-term capital losses and capital loss carryforwards available from prior years). Dividends and distributions are generally paid once a year. Each Fund intends to distribute at least 98% of any ordinary income for the calendar year (not taking into account any capital gains or losses), plus 98.2% of capital gain net income realized during the 12-month period ended October 31 in that year, if any. Each Fund intends to distribute any undistributed ordinary income and capital gain net income in the following year. With respect to the Driehaus International Small Cap Growth Fund, Driehaus Emerging Markets Small Cap Growth Fund and Driehaus Micro Cap Growth Fund, because each Fund succeeded to the tax basis of the assets of its predecessor limited partnership(s), shareholders should be aware that, as portfolio securities that were received from the limited partnership(s) are sold, any capital gain that existed at the time the Fund acquired the securities from the limited partnership(s), along with any appreciation that occurred while the Fund held the securities, may be recognized by the Fund, and such recognized gain, if any, will be distributed to Fund shareholders as dividends or distributions and will be taxable to them for federal income tax purposes.

Federal Income Tax Status of Dividends and Other Distributions. Distributions by a Fund of investment company taxable income (determined without regard to the deduction for dividends paid) are generally subject to federal income tax at ordinary income tax rates. However, a portion of such distributions that were derived from certain corporate dividends may qualify for either the 70% dividends received deduction available to corporate shareholders under the Internal Revenue Code of 1986, as amended (the “Code”), or the reduced rates of federal income taxation for “qualified dividend income” currently available to individual and other noncorporate shareholders under the Code, provided certain holding period and other requirements are satisfied. However, dividends received by a Fund from foreign corporations are not expected to qualify for the dividends received deduction and dividends received from certain foreign corporations may not qualify for treatment as qualified dividend income. Distributions of net capital gains, if any, are generally taxable as long-term capital gains for federal income tax purposes regardless of how long a shareholder has held shares of a Fund. The U.S. federal income tax status of all distributions will be designated by a

Fund and reported to its shareholders annually. Distributions are taxable in the year they are paid, whether they are taken in cash or reinvested in additional shares, except that certain distributions declared to shareholders of record in the last three months of the calendar year and paid in the following January are taxable as if paid on December 31 of the year declared.

Taxability of Distributions to Individuals and Other Noncorporate Shareholders (taxable years beginning in 2016)

In addition, an additional 3.8% Medicare tax is imposed on certain net investment income (including dividends and capital gain distributions received from a Fund and net gains from redemptions or other taxable dispositions of Fund shares) of U.S. individuals, estates and trusts to the extent that such person’s “modified adjusted gross income” (in the case of an individual) or “adjusted gross income” (in the case of an estate or trust) exceeds a threshold amount.

Investment income received by a Fund from sources within foreign countries may be subject to foreign income taxes withheld at the source. The U.S. has entered into tax treaties with many foreign countries that generally entitle each Fund to a reduced rate of tax or exemption from tax on such income. It is impossible to determine the effective rate of foreign tax in advance since the amount of a Fund’s assets to be invested within various countries will fluctuate and the extent to which tax refunds will be recovered is uncertain. Each Fund intends to operate so as to qualify for treaty-reduced tax rates where applicable.

To the extent that a Fund is liable for foreign income taxes, the Fund may make an election under the Code to “pass through” to the Fund’s shareholders foreign income taxes paid, but there can be no assurance that the Fund will qualify to make such election. It is not expected that the Driehaus Micro Cap Growth Fund will qualify to make such election. If this election is made, shareholders will generally be able to claim a credit or deduction (subject to certain limitations) on their federal income tax returns for, and will be required to treat as part of the amounts distributed to them, their pro rata portion of the income taxes paid by the Fund to foreign countries (which taxes relate primarily to investment income). Under the Code, no deduction for foreign taxes may be claimed by individual shareholders who do not elect to itemize deductions on their federal income tax returns, although such a shareholder may be able to claim a credit for foreign taxes paid and in any event will be treated as having taxable income in the amount of the shareholder’s pro rata share of foreign taxes paid by the Fund. If a Fund does not make such an election, the foreign taxes paid by the Fund will reduce the Fund’s net investment income. In such a case, shareholders will not be able to claim either a credit or a deduction for their pro rata portion of such taxes paid by the Fund, nor will shareholders be required to treat as part of the amounts distributed to them their pro rata portion of such taxes paid.

Buying a Distribution. If you buy shares before a Fund deducts a distribution from its net asset value, you will pay the full price for the shares and then receive a portion of the price back in the form of a distribution, which may be subject to federal income tax as described above. In addition, a Fund’s share price may, at any time, reflect undistributed capital gains or income and unrealized appreciation, which may result in future taxable distributions. Such distributions can occur even in a year when a Fund has a negative return.

Redemption of Fund Shares. Unless a shareholder is a tax-exempt investor or investing through a tax-advantaged account, a redemption or exchange of fund shares is generally considered a taxable event for federal income tax purposes. Depending on the purchase price and the sale price of the shares redeemed or exchanged, the shareholder may have a gain or loss on the transaction. The gain or loss will generally be treated as a long-term capital gain or loss if the shareholder held the shares for more than one year. If the shareholder held the shares for one year or less, the gain or loss will generally be treated as a short-term capital gain or loss. Short-term capital gain is taxable at ordinary income tax rates for federal income tax purposes. Shareholders may be limited in their ability to utilize capital losses.

Any loss realized on sales or exchanges of Fund shares held six months or less will be treated as a long-term capital loss to the extent of any long-term capital gain distributions received by the shareholder with respect to such shares.

Backup Withholding. A Fund may be required to withhold federal income tax (“backup withholding”) at a 28% rate from dividends, distributions and redemption proceeds paid to certain shareholders. Backup withholding may be required if:

Cost Basis Reporting. The Funds are required to report to the IRS, and to furnish to Fund shareholders, detailed cost basis and holding period information for Fund shares acquired on or after January 1, 2012 (“covered shares”), that are redeemed on or after that date. These requirements do not apply to investments through a tax-advantaged arrangement, such as a 401(k) or an IRA. If you redeem covered shares during any year, the Funds will report the following information to the IRS and to you on Form 1099-B: (i) the cost basis of such shares, (ii) the gross proceeds you received on the redemption, and (iii) the holding period for the redeemed shares. The Funds’ default method for calculating the cost basis of covered shares is the average cost basis. You should contact your tax or other advisor about the application of the cost basis reporting rules to you, particularly whether you should elect a cost basis calculation method other than the default average cost basis. If you wish to change your cost basis methodology, please see the Cost Basis Election Form at www.driehaus.com or call 1-800-560-6111. If you hold your Fund shares through a financial intermediary, please contact your representative regarding the reporting of cost basis and available elections for your account.

Taxation of Non-U.S. Shareholders. Non-U.S. shareholders, including shareholders who, with respect to the U.S., are nonresident aliens, may be subject to U.S. withholding tax on certain distributions at a rate of 30% or such lower rates as may be prescribed by an applicable treaty.

Certifications of federal income tax status are contained in the account application that should be completed and returned when opening an account. Each Fund must promptly pay to the IRS all amounts withheld. Therefore, it is usually not possible for a Fund to reimburse a shareholder for amounts withheld. A shareholder may, however, claim the amount withheld as a credit on the shareholder’s federal income tax return, provided certain information is provided to the IRS.

The foregoing discussion of U.S. federal income taxation is only a general summary as of April 30, 2016. It is not intended to be a full discussion of all federal income tax laws and their effect on shareholders. Shareholders should consult their tax advisors as to the federal, state, local or foreign tax consequences of ownership of any Fund shares before making an investment in a Fund.

The financial highlights table is intended to help you understand the Fund’s financial performance for the past five years. Certain information reflects financial results for a single Fund share. The total returns in the table represent the rate that an investor would have earned (or lost) on an investment in the Fund (assuming reinvestment of all dividends and distributions). The information below has been audited by Ernst & Young LLP, whose report, along with the Fund’s financial statements, is included in the annual report, which is available, without charge, upon request.

The financial highlights table is intended to help you understand the Fund’s financial performance since inception. Certain information reflects financial results for a single Fund share. The total returns in the table represent the rate that an investor would have earned (or lost) on an investment in the Fund (assuming reinvestment of all dividends and distributions). The information below has been audited by Ernst & Young LLP, whose report, along with the Fund’s financial statements, is included in the annual report, which is available, without charge, upon request.

The financial highlights table is intended to help you understand the Fund’s financial performance for the past five years. Certain information reflects financial results for a single Fund share. The total return in the table represents the rate that an investor would have earned (or lost) on an investment in the Fund (assuming reinvestment of all dividends and distributions). The information below has been audited by Ernst & Young LLP, whose report, along with the Fund’s financial statements, is included in the annual report, which is available, without charge, upon request.

More information on these Funds is available without charge, upon request, including the following:

Annual/Semi-Annual Reports

Additional information about the Funds’ investments is available in the Funds’ annual and semi-annual reports to shareholders. In the Funds’ annual report, you will find a letter from the Adviser discussing recent market conditions, economic trends and Fund strategies that significantly affected the Funds’ performance during the Funds’ last fiscal year.

Statement of Additional Information (SAI)

The SAI provides more details about each Fund and its policies. A current SAI is on file with the SEC and is incorporated by reference.

To Obtain Information:

By Telephone

Call 1-800-560-6111

By Mail

Write to:

Driehaus Mutual Funds

P.O. Box 9817

Providence, RI 02940

On the Internet

Text-only versions of Fund documents, including the SAI, annual and semi-annual reports can be viewed online or downloaded without charge from: www.driehaus.com or the SEC at http://www.sec.gov.

You can also obtain copies by visiting the SEC’s Public Reference Room in Washington, DC (1-202-551-8090) or by sending your request by email to publicinfo@sec.gov or to the SEC’s Public Reference Section, Washington, DC 20549-1520 (a duplicating fee is charged).

1940 Act File No. 811-07655

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

The Fund is actively managed by taking both long and short positions in debt and equity securities and investing in derivatives (swaps, options and futures). The investment adviser uses techniques intended to provide absolute (positive) returns in various markets by employing strategies that exploit disparities or inefficiencies in markets. The Fund invests primarily in U.S. fixed-income and floating rate securities, including fixed and floating rate loans that have a senior right to repayment (“Senior Loans”). The Fund may invest in securities of both investment and non-investment (“junk”) grade credit quality and may invest in securities that have not been rated by a rating agency. The investment adviser is not constrained by ratings when selecting debt securities for investment. The Fund may invest in debt securities of any maturity and does not attempt to maintain any pre-set average portfolio maturity or duration. The Fund seeks to target the annualized volatility of the Barclays Capital U.S. Aggregate Bond Index, which tracks the U.S. investment grade fixed rate bond market. The Fund may invest in common and preferred stocks across all market capitalizations. The Fund may use derivatives to manage interest rate risk, as part of a hedging strategy

(attempting to reduce risk by offsetting one investment position with another) or to speculate. In addition to investing in outright long and short positions, as part of its investment strategy, the Fund will engage in a variety of arbitrage trading strategies to seek to take advantage of relative value opportunities between two or more securities. The Fund may hold a substantial position in cash and money market instruments. The Fund will invest in a relatively low number of issuers, making it a nondiversified fund. In managing the Fund, the investment adviser utilizes fundamental market analysis and macroeconomic analysis to identify investment opportunities. Fundamental market analysis includes an assessment of yield and credit quality differences among securities as well as demand and supply trends. Macroeconomic analysis includes an assessment of fiscal and monetary status and the anticipation of changes in global economies, markets, political conditions and other factors. Investment decisions may also be based on technical factors such as price momentum, market sentiment, and supply or demand imbalances. The Fund sells holdings for a variety of reasons, such as to adjust its average maturity or quality, to shift assets into better yielding securities, or to alter sector exposure.

All investments, including those in mutual funds, have risks. No investment is suitable for all investors. The Fund is intended for investors who can accept the risks involved with its investments, such as credit risk, and who can accept the fact that there will be principal fluctuation. Of course, there can be no assurance that the Fund will achieve its objective. You may lose money by investing in the Fund. Below are the main risks of investing in the Fund:

Main Risks of Debt Securities. Debt securities may be subject to credit risk, interest rate risk, prepayment and extension risk as well as call risk. Credit risk is the failure of an issuer or borrower to make timely interest or principal payments, or a decline or perception of a decline in the credit quality of a bond or creditworthiness of a borrower, which can cause the security’s price to fall, potentially lowering the Fund’s share price. Prices of bonds and Senior Loans tend to move inversely with changes in interest rates. Typically, a rise in rates will adversely affect bond and Senior Loan prices and, accordingly, the Fund’s share price. The longer the Fund’s effective maturity and duration, the more its share price is likely to react to interest rates. Interest rate changes normally have different effects on variable or floating rate securities than they do on securities with fixed interest rates. When interest rates fall, debt securities may be repaid more quickly than expected and the Fund may be required to reinvest the proceeds at a lower interest rate. This is referred to as “prepayment risk.” When interest rates rise, debt securities may be repaid more slowly than expected and the value of the Fund’s holdings may fall sharply. This is referred to as “extension risk.” If an issuer “calls” its bond before its maturity date during a time of declining interest rates, the Fund might have to reinvest the proceeds in an investment offering a lower yield.

Fixed-Income Market Risk. Economic and other market developments can adversely affect fixed-income securities markets in the United States, Europe and elsewhere. At times, participants in debt securities markets may develop concerns about the ability of certain issuers of debt securities to make timely principal and interest payments, or they may develop concerns about the ability of financial institutions that make markets in certain debt securities to facilitate an orderly market. Those concerns can cause increased volatility in those debt securities or debt securities markets and the related derivatives markets. Under some circumstances, those concerns could cause reduced liquidity in certain debt securities markets and the related derivative traded securities. A lack of liquidity or other adverse credit market conditions may hamper the Fund’s ability to sell the debt securities in which it invests or to find and purchase suitable debt instruments.

High Yield Risk. Low-rated and comparable unrated securities (“junk bonds”), while generally offering higher yields than investment grade securities with similar maturities, involve greater risks, including the possibility of default or bankruptcy. They are regarded as speculative with respect to the issuer’s capacity to pay interest and to repay principal. The market values of certain of these securities tend to be more sensitive to individual corporate development and changes in economic conditions than higher quality bonds. In addition, junk bonds tend to be less marketable than higher-quality debt securities because the market for them is not as broad or active. The lack of a liquid secondary market may have an adverse effect on market price and the Fund’s ability to sell particular securities.

Senior Loan Risk. Senior Loans are loans made to borrowers that may be corporations, partnerships or other entities (each a “Borrower”). Investing in Senior Loans involves investment risk and some Borrowers default on their Senior Loan repayments. The risks associated with Senior Loans are similar to the risks of high yield bonds, although

Senior Loans typically are senior and secured, whereas high yield bonds often are subordinated and unsecured. An economic downturn generally leads to a higher non-payment rate, and a Senior Loan may lose significant value before a default occurs. There is no assurance that the liquidation of the collateral would satisfy the claims of the Borrower’s obligations in the event of the non-payment of scheduled interest or principal, or that the collateral could be readily liquidated.

No active trading market may exist for certain Senior Loans, which may impair the ability of the Fund to realize full value in the event of the need to sell a Senior Loan and which may make it difficult to value Senior Loans. Adverse market conditions may impair the liquidity of some actively traded Senior Loans. To the extent that a secondary market does exist for certain Senior Loans, the market may be subject to irregular trading activity, wide bid/ask spreads and extended trade settlement periods.

Main Risks of Derivatives. Derivative instruments (such as swaps, options and futures) often have risks similar to their underlying currency, security or index, in addition to other risks. The use of derivatives also involves risks different from, and possibly greater than, the risks associated with investing directly in the underlying assets. Derivatives can be highly volatile, illiquid and difficult to value, and there is a risk of imperfect correlation between the value of the derivative and the underlying instrument. Derivative instruments may give rise to leverage and losses on derivatives may substantially exceed the initial investment. When used for hedging, the change in value of the derivative may also not correlate specifically with the currency, security or other risk being hedged. Further, since the Fund may invest in derivatives for speculative purposes, losses from speculative positions in a derivative may be much greater than the derivative’s original cost and may be substantial. With over-the-counter derivatives, there is the risk that the other party to the transaction could default. Derivatives may be subject to pricing or “basis” risk, which exists when a particular derivative becomes extraordinarily expensive relative to historical prices or the prices of its corresponding instrument. Additionally, to the extent the Fund is required to segregate or “set aside” (often referred to as “asset segregation”) liquid assets or otherwise cover open positions with respect to certain derivative instruments, the Fund may be required to sell portfolio instruments to meet these asset segregation requirements. There is a possibility that segregation involving a large percentage of the Fund’s assets could impede portfolio management or the Fund’s ability to meet redemption requests or other current obligations.

Options and Futures Contracts Risk. Participation in the options or futures markets involves investment risks and transaction costs to which the Fund would not be subject absent the use of these strategies. In particular, the loss from investing in futures contracts is potentially unlimited. If the Fund’s investment adviser’s prediction of movements in the underlying reference securities, interest rate or currency markets is inaccurate, the Fund could be in a worse position than if such strategies were not used. Risks inherent in the use of options, futures contracts and options on futures contracts include: (1) imperfect correlation between the price of options and futures contracts and options thereon and movements in the prices of the securities being hedged; (2) the fact that skills needed to use these strategies are different from those needed to select portfolio securities; and (3) the possible absence of a liquid secondary market for any particular instrument at any time.

the investment performance of the Fund would diminish compared with what it would have been if these techniques were not used. Moreover, even if the investment adviser is correct in its forecasts, there is a risk that a credit derivative position may correlate imperfectly with the price of the asset or liability being protected. The Fund’s risk of loss in a credit derivative transaction varies with the form of the transaction.

Liquidity Risk. When there is little or no active trading market for specific types of securities, it can become more difficult to sell the securities at or near their perceived value. In such a market, the value of such securities and the Fund’s share price may decrease. No active trading market may exist for some Senior Loans, derivatives, bonds or equities. Certain securities may be subject to restrictions on resale. The inability to dispose of Senior Loans, derivatives, bonds or equities in a timely fashion could result in losses to the Fund.

Foreign Securities and Foreign Currencies Risk. The Fund invests in foreign debt and equity securities. To the extent portfolio securities are issued by foreign issuers or denominated in foreign currencies, the Fund’s investment performance is affected by the strength or weakness of the U.S. dollar against these currencies. Investing outside the U.S. involves different risks than domestic investments. The following risks may be associated with foreign investments: less liquidity; greater volatility; political instability; restrictions on foreign investment and repatriation of capital; less complete and reliable information about foreign companies; reduced government supervision of some foreign securities markets; lower responsiveness of foreign management to shareholder concerns; economic issues or developments in foreign countries; fluctuation in exchange rates of foreign currencies and risks of devaluation; imposition of foreign withholding and other taxes; dependence of emerging market companies upon commodities which may be subject to economic cycles; and emerging market risk such as limited trading volume, expropriation, devaluation or other adverse political or social developments.

Market Risk. The Fund is subject to market risk, which is the possibility that securities prices overall, including both debt and equity securities, will decline over short or long periods. Securities markets tend to move in cycles, with periods of rising prices and periods of falling prices. These fluctuations are expected to have a substantial influence on the value of the Fund’s shares.

Risks of Holding Cash or Similar Instruments. During periods when the Fund holds a substantial position in cash and money market instruments, the Fund will earn less income than it would if it invested in higher yielding securities. Holding a large cash position for an extended period of time may result in the Fund not achieving its investment objective. To the extent that the Fund invests in money market mutual funds for its cash position, there will be some duplication of expenses because the Fund will bear its pro rata portion of such funds’ management fees and operational expenses.

Short Sale Risk. Short sales expose the Fund to the risk that it will be required to buy the security sold short (also known as “covering” the short position) at a time when the security has appreciated in value, thus resulting in a loss to the Fund. The amount the Fund could lose on a short sale is theoretically unlimited (as compared to a long position, where the maximum loss is the amount invested). The use of short sales may also cause the Fund to have higher expenses than those of other funds.

Nondiversification. Because the Fund may invest a greater percentage of assets in a particular issuer or a small number of issuers, it may be subject to greater risks and larger losses than diversified funds. The value of the Fund may vary more as a result of changes in the financial condition or the market’s assessment of the issuers than a more diversified fund.

Allocation Risk. The Fund’s overall risk level will depend on the market sectors in which the Fund is invested and the current interest rate, liquidity and credit quality of such sectors. The Fund may overweight or underweight certain issuers, industries or market sectors, which may cause the Fund’s performance to be more or less sensitive to developments affecting those issuers, industries or sectors. The Fund may have significant weightings in a particular issuer, sector or industry, which may subject the Fund to greater risks than less focused funds.

Manager Risk. How the investment adviser manages the Fund will impact the Fund’s performance. The Fund may lose money if the investment adviser’s investment strategy does not achieve the Fund’s objective or if the investment adviser does not implement the strategy successfully.

The bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows the volatility — or variability — of the Fund’s annual total returns over time, and shows that Fund performance can change from year to year. The table shows the Fund’s average annual total returns for certain time periods compared to the returns of two broad-based securities indices. Of course, the Fund’s past performance (before and after taxes) is not necessarily an indication of future performance. Updated performance information is available by visiting www.driehaus.com or by calling 1-877-779-0079.

The Fund commenced operations on June 1, 2009, following the receipt of the assets and liabilities of the Lotsoff Capital Management Active Income Fund (the “Predecessor Fund”), managed by Lotsoff Capital Management, through a reorganization into the Fund. Certain financial and performance information in this Prospectus includes that of the Predecessor Fund.

During the periods shown in the bar chart, the highest return for a quarter was 9.51% (quarter ended 6/30/09) and the lowest return for a quarter was –8.53% (quarter ended 9/30/11).

The table shows returns on a before-tax and after-tax basis. After-tax returns are calculated using the highest historic marginal individual federal income tax rates during the period and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown in the table. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).

The Fund is closed to most new investors in an effort to slow the pace of inflows and protect the integrity of its investment process. For additional information, please see “Shareholder Information — General Purchase Information.” The following is applicable to eligible new investors:

In general, you can buy or sell shares of the Fund by regular mail addressed to Driehaus Mutual Funds, c/o UMB Fund Services, Inc., P.O. Box 2175, Milwaukee, WI 53201-2175, or by overnight delivery addressed to Driehaus Mutual Funds, c/o UMB Fund Services, Inc., 235 W. Galena Street, Milwaukee, WI 53212, or by phone at 1-877-779-0079 on any business day. You may also buy and sell shares through a financial professional.

If you purchase the Fund through a broker-dealer or other financial intermediary (such as a bank), the Fund and its related companies may pay the intermediary for the sale of Fund shares and related services, including recordkeeping, administrative and other sub-transfer agency services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your financial intermediary’s web site for more information.

Driehaus Select Credit Fund seeks to provide positive returns under a variety of market conditions.

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

The Fund is actively managed by taking both long and short positions in debt and equity securities and investing in derivatives (swaps, options and futures). The investment adviser uses techniques intended to provide absolute (positive) returns in various markets by employing strategies that exploit disparities or inefficiencies in markets. The Fund invests primarily in U.S. fixed-income and floating rate securities, including fixed and floating rate loans that have a senior right to repayment (“Senior Loans”). The Fund may invest in securities of both investment and non-investment (“junk”) grade credit quality and may invest in securities that have not been rated by a rating agency. The investment adviser is not constrained by ratings when selecting debt securities for investment. The Fund may invest in debt securities of any maturity and does not attempt to maintain any pre-set average portfolio maturity or duration. The Fund seeks to target the annualized volatility of the BofA Merrill Lynch U.S. High Yield Index, which tracks the performance of below-investment grade, U.S. dollar-denominated corporate bonds. The Fund may invest in common and preferred stocks across all market capitalizations. The Fund may use derivatives to manage interest rate risk, as

part of a hedging strategy (attempting to reduce risk by offsetting one investment position with another) or to speculate. In addition to investing in outright long and short positions, as part of its investment strategy, the Fund will engage in a variety of arbitrage trading strategies to seek to take advantage of relative value opportunities between two or more securities. The Fund may hold a substantial position in cash and money market instruments. The Fund will invest in a relatively low number of issuers, making it a nondiversified fund. In managing the Fund, the investment adviser utilizes fundamental market analysis and macroeconomic analysis to identify investment opportunities. Fundamental market analysis includes an assessment of yield and credit quality differences among securities as well as demand and supply trends. Macroeconomic analysis includes an assessment of fiscal and monetary status and the anticipation of changes in global economies, markets, political conditions and other factors. Investment decisions may also be based on technical factors such as price momentum, market sentiment, and supply or demand imbalances. The Fund sells holdings for a variety of reasons, such as to adjust its average maturity or quality, to shift assets into better yielding securities, or to alter sector exposure.

All investments, including those in mutual funds, have risks. No investment is suitable for all investors. The Fund is intended for investors who seek positive returns under a variety of market conditions and can accept the risks involved with its investments, such as credit risk, and who can accept the fact that there will be principal fluctuation. Of course, there can be no assurance that the Fund will achieve its objective. You may lose money by investing in the Fund. Below are the main risks of investing in the Fund:

Senior Loan repayments. The risks associated with Senior Loans are similar to the risks of high yield bonds, although Senior Loans typically are senior and secured, whereas high yield bonds often are subordinated and unsecured. An economic downturn generally leads to a higher non-payment rate, and a Senior Loan may lose significant value before a default occurs. There is no assurance that the liquidation of the collateral would satisfy the claims of the Borrower’s obligations in the event of the non-payment of scheduled interest or principal, or that the collateral could be readily liquidated.

of the Dodd-Frank Act, certain swap agreements may be cleared through a clearinghouse and traded on an exchange or swap execution facility. The regulation of swaps markets has increased over the last few years, and future regulation of the swaps markets may make swaps more costly, may limit the availability of swaps, or may otherwise adversely affect the value or performance of swaps. Any such adverse future developments could impair the effectiveness of the Fund’s swaps transactions and cause the Fund to lose value.

issuers, industries or market sectors, which may cause the Fund’s performance to be more or less sensitive to developments affecting those issuers, industries or sectors. The Fund may have significant weightings in a particular issuer, sector or industry, which may subject the Fund to greater risks than less focused funds.

The bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows the volatility — or variability — of the Fund’s annual total returns over time, and shows that Fund performance can change from year to year. The table shows the Fund’s average annual total returns for certain time periods compared to the returns of two broad-based securities indices. Of course, the Fund’s past performance (before and after taxes) is not necessarily an indication of future performance. Updated performance information is available by visiting www.driehaus.com or by calling 1-877-779-0079.

During the period shown in the bar chart, the highest return for a quarter was 7.10% (quarter ended 3/31/12) and the lowest return for a quarter was –7.78% (quarter ended 9/30/11).

If you purchase the Fund through a broker-dealer or other financial intermediary (such as a bank), the Fund and/or its related companies may pay the intermediary for the sale of Fund shares and/or related services, including recordkeeping, administrative and other sub-transfer agency services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your financial intermediary’s web site for more information.

Driehaus Event Driven Fund seeks to provide positive returns over full-market cycles.

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

The Fund is actively managed by using techniques intended to provide positive returns over full-market cycles. In making investment decisions, Driehaus Capital Management LLC, the Fund’s investment adviser (the “Adviser”), will employ event-driven strategies designed to exploit disparities or inefficiencies in U.S. and foreign (non-U.S.) equity and debt markets. The Adviser will seek investment opportunities where a catalyst is expected to occur within the near to intermediate term, generally within 12 months, to unlock the value embedded in the investment opportunity. Investment opportunities will often center on corporate events such as bankruptcies, mergers, acquisitions, refinancings, corporate reactions to government and regulatory agency rulings, earnings surprises and other corporate events. The Fund will invest in a broad range of asset classes, including fixed-income and floating rate debt securities (across credit tiers), loans, common stocks, preferred stocks, American Depositary Receipts and Global Depositary Receipts, options, futures and swaps. Securities held will be issued by, or be in reference to, U.S. and non-U.S. companies. The Fund may also invest in currencies.

The Fund seeks to target an annualized volatility, as measured by the standard deviation of returns, of less than that of the S&P 500^® Index over full-market cycles, which are typically periods of three to five years. Annualized volatility refers to the fluctuation of a security’s value on a yearly basis. The Fund’s volatility will be monitored daily and positions within the Fund will be adjusted as appropriate to attempt to achieve the stated volatility target. The Fund holds both long and short positions in debt securities (both sovereign and corporate), equity securities and currencies. The debt securities held in the Fund may be fixed income or floating rate securities, including fixed and floating rate loans. These securities may have a senior right to repayment (“Senior Loans”) and/or may be of either investment grade or non-investment grade (“junk”) credit quality. Debt securities may or may not have been rated by a rating agency and the Adviser is not constrained by ratings when selecting debt securities for investment. The Fund may invest in debt securities of any maturity and does not attempt to maintain any pre-set average portfolio maturity or duration. The Fund also invests in common and preferred stocks across all market capitalizations and regions. The Fund will have significant exposure to foreign currencies and interest rates.

The Fund also holds derivative instruments, including swaps, options, futures and forwards that provide long and short exposures to debt securities, equity securities and currencies. The Fund may use derivatives to manage interest rate and currency risk, as part of a hedging strategy (attempting to reduce risk by offsetting one investment position with another) and/or to replicate outright long or short exposures. In addition to investing in outright long and short positions, as part of its investment strategy, the Fund will engage in a variety of arbitrage trading strategies that seek to take advantage of relative value opportunities between two or more securities. The Fund may hold a substantial position in cash and money market instruments. The cash holdings of the Fund will vary significantly based on the Adviser’s use of equity and credit derivatives. Generally, the more derivatives held within the Fund, the higher its cash balance.

The securities and instruments that the Fund invests in may trade in markets in multiple countries. The Fund’s investments may be highly concentrated in a geographic region or country, including emerging market countries. The Fund will invest in a relatively low number of issuers, making it a nondiversified fund. The Fund may frequently and actively trade its portfolio.

All investments, including those in mutual funds, have risks. No investment is suitable for all investors. The Fund is intended for investors who seek positive returns under a variety of market conditions and can accept the risks involved with its investments, and who can accept the fact that there will be principal fluctuation. Of course, there can be no assurance that the Fund will achieve its objective. You may lose money by investing in the Fund. Below are the main risks of investing in the Fund:

Event Risk. Event-driven opportunities may not occur as anticipated, resulting in potentially reduced returns or losses to the Fund as it unwinds trades where those opportunities do not materialize as anticipated.

Main Risks of Debt Securities. Debt securities may be subject to credit risk, interest rate risk, prepayment and extension risk as well as call risk. Credit risk is the failure of an issuer or borrower to make timely interest or principal payments, or a decline or perception of a decline in the credit quality of a bond or creditworthiness of a borrower, which can cause the security’s price to fall, potentially lowering the Fund’s share price. Prices of bonds and Senior Loans tend to move inversely with changes in interest rates. Typically, a rise in rates will adversely affect bond and Senior Loan prices and, accordingly, the Fund’s share price. The longer a debt security’s effective maturity and duration, the more its price is likely to react to interest rates. Interest rate changes normally have different effects on variable or floating rate securities than they do on securities with fixed interest rates. When interest rates fall, debt securities may be repaid more quickly than expected and the Fund may be required to reinvest the proceeds at a lower interest rate. This is referred to as “prepayment risk.” When interest rates rise, debt securities may be repaid more slowly than expected and the value of the Fund’s holdings may fall sharply. This is referred to as “extension risk.” If an issuer “calls” its bond before its maturity date during a time of declining interest rates, the Fund might have to reinvest the proceeds in an investment offering a lower yield.

Senior Loan Risk. Senior Loans are business loans made to borrowers that may be corporations, partnerships or other entities (each a “Borrower”). These Borrowers operate in a variety of industries and across geographic regions. Investing in Senior Loans involves investment risk and some Borrowers default on their Senior Loan repayments. The risks associated with Senior Loans are similar to the risks of junk bonds, although Senior Loans typically are senior and secured, whereas junk bonds often are subordinated and unsecured. Investments in Senior Loans typically are below investment grade and are considered speculative because of the credit risks of their Borrowers. Such Borrowers are more likely to default on their payments of interest and principal owed, and such defaults could reduce the Fund’s net asset value and income distributions. An economic downturn generally leads to a higher non-payment rate, and a Senior Loan may lose significant value before a default occurs. There is no assurance that the liquidation of the collateral would satisfy the claims of the Borrower’s obligations in the event of the non-payment of scheduled interest or principal, or that the collateral could be readily liquidated.

Main Risks of Foreign Securities and Foreign Currencies. The Fund invests in foreign debt and equity securities. To the extent portfolio securities are issued by foreign issuers or denominated in foreign currencies, the Fund’s investment performance is affected by the strength or weakness of the U.S. dollar against these currencies. Investing outside the U.S. involves different risks than domestic investments. The following risks may be associated with foreign investments: less liquidity; greater volatility; political instability; restrictions on foreign investment and repatriation of capital; less complete and reliable information about foreign companies; reduced government supervision of some foreign securities markets; lower responsiveness of foreign management to shareholder concerns; economic issues or developments in foreign countries; fluctuation in exchange rates of foreign currencies and risks of devaluation; imposition of foreign withholding and other taxes; dependence of emerging market companies upon commodities which may be subject to economic cycles; and emerging market risk such as limited trading volume, expropriation, devaluation or other adverse political or social developments.

Emerging Market Risk. The Fund will invest in emerging and developing markets and therefore, the risks described above for foreign securities are typically increased. Investments in securities of issuers located in such countries are often speculative and subject to certain special risks. The small size, limited trading volume and relative inexperience of the securities markets in these countries may make the Fund’s investments in such countries illiquid and more volatile than investments in more developed countries, and the Fund can be required to establish special custodial or other arrangements before making investments in these countries. There may be less financial or accounting information available with respect to issuers located in these countries, and it may be difficult as a result to assess the value or prospects of an investment in such issuers.

Main Risks of Derivatives. Derivative instruments (such as swaps, options, futures and forwards) often have risks similar to their underlying currency, security or index, in addition to other risks. The use of derivatives also involves risks different from, and possibly greater than, the risks associated with investing directly in the underlying assets. Derivatives can be highly volatile, illiquid and difficult to value, and there is a risk of imperfect correlation between

the value of the derivative and the underlying instrument. Derivative instruments may give rise to leverage and losses on derivatives may substantially exceed the initial investment. When used for hedging, the change in value of the derivative may also not correlate specifically with the currency, security or other risk being hedged. Further, since the Fund may invest in derivatives for speculative purposes, losses from speculative positions in a derivative may be much greater than the derivative’s original cost and may be substantial. With over-the-counter derivatives, there is the risk that the other party to the transaction could default. Derivatives may be subject to pricing or “basis” risk, which exists when a particular derivative becomes extraordinarily expensive relative to historical prices or the prices of its corresponding instrument. Additionally, to the extent the Fund is required to segregate or “set aside” (often referred to as “asset segregation”) liquid assets or otherwise cover open positions with respect to certain derivative instruments, the Fund may be required to sell portfolio instruments to meet these asset segregation requirements. There is a possibility that segregation involving a large percentage of the Fund’s assets could impede portfolio management or the Fund’s ability to meet redemption requests or other current obligations.

Risks of Holding Cash or Similar Instruments. During periods when the Fund holds a substantial position in cash and money market instruments, the Fund will earn less income than it would if it invested in higher yielding securities. Holding a large cash position for an extended period of time may result in the Fund not achieving its investment objective. To the extent that the Fund invests its cash position in money market mutual funds, there will be some duplication of expenses because the Fund will bear its pro rata portion of such funds’ management fees and operational expenses.

Short Sale Risk. Short sales expose the Fund to the risk that it will be required to buy the security sold short (also known as “covering” the short position) at a time when the security has appreciated in value, thus resulting in a loss to the Fund. The amount the Fund could lose on a short sale is theoretically unlimited (as compared to a long position, where the maximum loss is the amount invested). The use of short sales also may cause the Fund to have higher expenses than those of other funds due to the payment of dividends and interest, if any, in connection with the short positions as well as the cost to borrow the security.

Allocation Risk. The Fund’s overall risk level will depend on the market sectors and countries in which the Fund is invested and the current interest rate, liquidity and credit quality of such sectors and countries. The Fund may overweight or underweight certain companies, industries, market sectors, or countries, which may cause the Fund’s performance to be more or less sensitive to developments affecting those companies, industries, sectors or countries. The Fund may have significant weightings in a particular issuer, country, sector or industry, which may subject the Fund to greater risks than less focused funds.

High Rates of Turnover. The Fund may experience high rates of portfolio turnover, which may result in payment by the Fund of above-average transaction costs and could result in the payment by shareholders of taxes on above-average amounts of realized investment gains, including net short-term capital gains, which are taxed as ordinary income for federal income tax purposes. To the extent the Fund engages in short sales (which are not included in calculating the portfolio turnover rate), the transaction costs incurred by the Fund are likely to be greater than the transaction costs incurred by a mutual fund that does not take short positions and has a similar portfolio turnover rate.

The bar chart and table provide some indication of the risks of investing in the Fund. The bar chart will show the volatility — or variability — of the Fund’s annual total returns over time. The table shows the Fund’s average annual total returns for certain time periods compared to the returns of two broad-based securities indices. Of course, the Fund’s past performance (before and after taxes) is not necessarily an indication of future performance. Updated performance information is available by visiting www.driehaus.com or by calling 1-877-779-0079.

During the period shown in the bar chart, the highest return for a quarter was 4.44% (quarter ended 3/31/15) and the lowest return for a quarter was –5.97% (quarter ended 9/30/14).

If you purchase the Fund through a broker-dealer or other financial intermediary (such as a bank), the Fund and/or its related companies may pay the intermediary for the sale of Fund shares and/or related services, including recordkeeping, administrative and other sub-transfer agency services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your financial intermediary’s web site for more information.

The Driehaus Active Income Fund seeks to provide current income and capital appreciation. The Driehaus Select Credit Fund seeks to provide positive returns under a variety of market conditions. The Driehaus Event Driven Fund seeks to provide positive returns over full-market cycles. The Driehaus Active Income Fund, Driehaus Select Credit Fund and Driehaus Event Driven Fund are each referred to individually herein as a “Fund” and together as the “Funds.” Because markets in general, and the individual securities purchased by the Funds, go down in price as well as up, you may lose money by investing in the Funds. The Funds are specialized investment vehicles and should be used as part of your overall investment strategy to diversify your holdings. The Funds are each a series of the Driehaus Mutual Funds (the “Trust”), an open-end management investment company. Please review all the disclosure information carefully.

In managing the Driehaus Active Income Fund and Driehaus Select Credit Fund, the Adviser utilizes fundamental market analysis and macroeconomic analysis to identify investment opportunities. Fundamental market analysis includes an assessment of yield and credit quality differences among securities as well as demand and supply trends. Fundamental analysis also includes reviewing various attributes and risk factors, including, but not limited to: headline, credit, call, put, volatility and structure risks, and/or other idiosyncratic risks associated with a security. The Adviser considers numerous criteria in evaluating securities for investment and in determining sector and industry weightings including understanding the operational characteristics of the underlying company or assets, such as sales growth, operating leverage, cash flow metrics, balance sheet strength, and the competitive landscape. Macroeconomic analysis includes an assessment of fiscal and monetary status and the anticipation of changes in global economies, markets, political conditions and other factors. Investment decisions may also be based on technical factors such as price momentum, market sentiment, and supply or demand imbalances. In addition, the Adviser expects to employ opportunistic trading strategies in achieving returns for the Funds.

In managing the Driehaus Event Driven Fund, the Adviser utilizes its fundamental research process to focus on identifying investment opportunities related to near to intermediate term corporate events with the objective of providing positive returns over full-market cycles. These corporate events may include, but are not limited to,

mergers, acquisitions, refinancings, product launches, earnings surprises, bankruptcies, spinoffs, tenders, and structural changes in the competitive landscape. Event-driven trade opportunities often exist as a result of the complexity of a company’s capital structure, the nontraditional nature of a company’s available securities, or the unwillingness of investors to participate in binary trades. A binary trade is a trade placed in the expectation that either an event will or will not happen. In utilizing the entire capital structure of a company, the Adviser seeks to identify discrepancies between current market values of the securities issued by an issuer and the perceived inherent value of such securities, including loans, bonds, convertible bonds, preferred stock, common stock, and credit and equity derivatives. The Adviser also seeks asymmetric payoff profiles in long, short and arbitrage opportunities. An asymmetric return profile exists when a portfolio manager’s return expectations skew toward a more significant gain from a trade than its estimated potential loss. Arbitrage opportunities may include, but are not limited to, merger arbitrage, convertible arbitrage and other kinds of arbitrage as they arise. Often these asymmetric payoff profiles are achieved through the Adviser’s trade structure. The Adviser believes expertise in security analysis on a global level coupled with comprehensive risk management can best identify and exploit the most attractive event-related opportunities. This investment philosophy may result in high portfolio turnover. High portfolio turnover in any year may result in payment by the Fund of above average amounts of transaction costs and could result in the payment by shareholders of taxes on above average amounts of realized investment gains, including net short-term capital gains, which are taxed as ordinary income for federal tax purposes.

The Driehaus Active Income Fund and Driehaus Select Credit Fund intend to pay dividends, if any, at least quarterly and the Driehaus Event Driven Fund intends to pay dividends, if any, at least annually. The amount of distributions will vary, and there is no guarantee the Funds will pay either income dividends or a capital gain distribution. Unless you are purchasing Fund shares through a tax-advantaged account (such as an individual retirement account (“IRA”)), buying Fund shares at a time when the Fund has undistributed income or gains can cost you money in taxes. Contact the Funds for information concerning when distributions will be paid. You should consult your tax advisor regarding your tax situation.

The following supplements the information regarding each Fund’s investment objective and principal investment strategy set forth in the Fund summaries.

Driehaus Active Income Fund. The Driehaus Active Income Fund seeks to provide current income and capital appreciation. This investment objective is fundamental and cannot be changed without the approval of shareholders. The Fund invests primarily in U.S. fixed-income and floating rate securities, but may also invest in foreign securities. The Fund also invests in common and preferred stocks across all market capitalizations. The Fund has no limit with respect to its portfolio maturity or duration and does not attempt to maintain any pre-set average portfolio duration. Duration is a measure of a debt security’s price sensitivity. Duration takes into account a debt security’s cash flows over time, including the possibility that a debt security might be prepaid by the issuer or redeemed by the holder prior to its stated maturity date. In contrast, maturity measures only the time until final payment is due. By way of example, a security with a duration of five years would likely drop five percent in value if interest rates rose one percentage point. The Fund may hold a substantial position in cash and money market instruments. The Fund will invest in a relatively low number of issuers, making it a nondiversified fund. The Adviser uses techniques intended to provide absolute (positive) returns in various markets by employing strategies that exploit disparities or inefficiencies in markets. The Fund seeks to target the annualized volatility of the Barclays Capital U.S. Aggregate Bond Index, which covers the U.S. investment grade fixed rate bond market.

Driehaus Select Credit Fund. The Driehaus Select Credit Fund seeks to provide positive returns under a variety of market conditions. This investment objective is fundamental and cannot be changed without the approval of shareholders. The Fund invests primarily in U.S. fixed-income and floating rate securities, but may also invest in foreign securities. The Fund also invests in common and preferred stocks across all market capitalizations. The Fund has no limit with respect to its portfolio maturity or duration and does not attempt to maintain any pre-set average portfolio duration. Duration is a measure of a debt security’s price sensitivity. Duration takes into account a debt security’s cash flows over time, including the possibility that a debt security might be prepaid by the issuer or redeemed by the holder prior to its stated maturity date. In contrast, maturity measures only the time until final payment is due. By way of example, a

security with a duration of five years would likely drop five percent in value if interest rates rose one percentage point. The Fund may hold a substantial position in cash and money market instruments. The Fund will invest in a relatively low number of issuers, making it a nondiversified fund. The Adviser uses techniques intended to provide absolute (positive) returns in various markets by employing strategies that exploit disparities or inefficiencies in markets. The Fund seeks to target the annualized volatility of the BofA Merrill Lynch U.S. High Yield Index, which tracks the performance of below-investment grade, U.S. dollar-denominated corporate bonds.

Driehaus Event Driven Fund. The Driehaus Event Driven Fund seeks to provide positive returns over full-market cycles. This investment objective is fundamental and cannot be changed without the approval of shareholders. The Fund will invest in a relatively low number of issuers, making it a nondiversified fund. The Adviser uses techniques intended to provide absolute (positive) returns in various markets by employing strategies that take advantage of disparities or inefficiencies in the market. The Fund seeks to target an annualized volatility, as measured by the standard deviation of returns, of less than that of the S&P 500^® Index over full-market cycles, which are typically periods of three to five years. Annualized volatility refers to the fluctuation of a security’s value on a yearly basis. The Fund’s volatility will be monitored daily and positions within the Fund will be adjusted as appropriate to attempt to achieve the stated volatility target.

The Adviser will seek investment opportunities where a catalyst has been identified that is expected to occur within the near to intermediate term, generally within twelve months, to unlock the value embedded in the investment opportunity. Investment opportunities will often center on corporate events such as bankruptcies, mergers, acquisitions, refinancings, corporate reactions to government and regulatory agency rulings, earnings surprise and other corporate events. The Fund will invest in a broad range of asset classes, including fixed-income and floating rate debt securities (across credit tiers), loans, common stocks, preferred stocks, American Depositary Receipts and Global Depositary Receipts, options, futures and swaps. Securities held will be issued by, or be in reference to, U.S. and non-U.S. companies. The Fund may also invest in currencies. The Fund may hold a substantial position in cash and money market instruments. The Fund will engage in a variety of arbitrage trading strategies which involve many of the same types of risks as the Fund’s other investment strategies. These trading strategies include: capital structure arbitrage, convertible arbitrage and merger arbitrage (each of which are described below). Event-driven trade opportunities often exist because of the complexity of capital structure, the nontraditional nature of the investment options, or the unwillingness of investors to participate in binary trades. The Adviser believes that these opportunities often lead the market to misprice a company’s securities.

Each Fund. Fixed-income and floating rate securities, including leveraged loans and Senior Loans, in which the Funds invest are typically rated by at least one of the three major nationally recognized statistical rating organizations, with the rating representing the rating agency’s current opinion of the creditworthiness of the issuer or borrower. The Funds invest in securities of any credit rating, including securities with credit ratings below investment grade, i.e., “high yield bonds”, and may also invest in securities that have not been rated by a rating agency, the Adviser is not constrained by ratings when selecting debt securities for investment. Investments in high yield bonds may be subject to greater credit risks than securities with credit ratings above investment grade and have a greater risk of default than investment grade debt securities. Senior Loans typically have the most senior position in a borrower’s capital structure or share the senior position with other senior debt securities of the borrower which generally gives the holders of secured Senior Loans a priority claim on some or all of the Senior Loan’s collateral in the event of a default.

There is less readily available, reliable information about some Senior Loans than for many other types of securities. While the Senior Loan interests held by the Funds typically will be structured as assignments from third parties, the Funds may also purchase participations from a loan investor (“Loan Investor”). With respect to a participation in a Senior Loan, as the Funds will typically have a contractual relationship with Loan Investor, not the borrower, the Funds assume the credit risk of both the Loan Investor and borrower. With respect to Senior Loans, there can be no assurance that the liquidation of any collateral would satisfy the borrower’s obligation in the event of bankruptcy or non-payment of scheduled interest or principal payments or that such collateral could be readily liquidated. In addition, actions taken by other investors in the Senior Loan may impact a Fund’s investment. In the event of the insolvency of a Loan Investor, a Fund may be treated as a general unsecured creditor of the Loan Investor and may not have a senior claim to the Loan Investor’s interest in the Senior Loan. In addition, there is no minimum rating or other independent evaluation of a borrower or its securities limiting the Funds’ investments. The Adviser relies primarily on its own evaluation of credit quality rather than on any available independent sources; therefore, each Fund is dependent on the analytical abilities of the Adviser.

A Fund may, but is not required to, use derivatives, such as futures, forwards, options and swaps, as a substitute for taking a position in an underlying security, for speculation (taking a position in the hope of increasing returns), to manage interest rate or currency risk, or as part of a hedging strategy (attempting to reduce risk by offsetting one investment position with another). These derivative transactions will involve forward contracts, futures contracts, options and swaps, including options on futures and swaps. A Fund may engage in short-selling for speculation or for hedging purposes. A short sale involves selling a security the Fund does not own. The amount the Fund could lose on a short sale is theoretically unlimited (as compared to a long position, where the maximum loss is the amount invested). When a Fund engages in short-selling for hedging purposes, it is attempting to limit exposure to a possible market decline in the value of one or more of its portfolio securities.

A Fund may use futures and options for hedging or speculation. Participation in the options or futures markets involves investment risks and transactions costs to which a Fund would not be subject absent the use of these strategies. In particular, the loss from investing in futures contracts is potentially unlimited. If the Adviser’s prediction of movements in the securities, interest rate or currency markets is inaccurate, a Fund could be in a worse position than if such strategies were not used. Risks inherent in the use of options, futures contracts and options on futures contracts include: (1) imperfect correlation between the price of options and futures contracts and options thereon and movements in the prices of the securities being hedged; (2) the fact that skills needed to use these strategies are different from those needed to select portfolio securities; and (3) the possible absence of a liquid secondary market for any particular instrument at any time.

A Fund may enter into swap agreements, including credit default swaps, which are agreements between two parties (counterparties) to exchange payments at specified dates (periodic payment dates) on the basis of a specified amount (notional amount) with the payments calculated with reference to a specified asset, reference rate, currency or index. It is possible that developments in the swaps market, including government regulation, could adversely affect a Fund’s ability to terminate existing swap agreements or to realize amounts to be received under such agreements.

Investment decisions are based on fundamental market factors, such as yield and credit quality differences among bonds as well as demand and supply trends. Investment decisions are also based on technical factors such as price momentum, market sentiment, and supply or demand imbalances. The Driehaus Event Driven Fund seeks to be opportunistic in pursuing companies that meet its criteria regardless of geographic location and, therefore, at certain times, the Fund could have sizeable positions in either developed countries or emerging markets. This opportunistic approach involves evaluating fundamental factors, including the company’s business model, the competitive landscape, upcoming product introductions and recent and projected financial metrics. A Fund sells holdings for a variety of reasons, such as to adjust its average maturity or quality, to shift assets into better yielding securities, or to alter sector or country exposure, or for the Driehaus Event Driven Fund, if the event-driven opportunity does not occur as expected.

For purposes of pursuing its investment goal, a Fund may enter into currency-related transactions involving certain derivative instruments, including currency and cross currency forwards, and currency and currency index futures contracts. The use of derivative currency transactions may allow the Fund to obtain net long or net negative (short) exposure to selected currencies. The results of such transactions may also represent, from time to time, a significant component of the Fund’s investment returns. A Fund may also enter into various other transactions involving derivatives, including financial futures contracts (such as interest rate or bond futures) and options on such contracts, and swap agreements (which may include interest rate and credit default swaps). The use of these derivative transactions may allow the Fund to obtain net long or net negative (short) exposures to selected interest rates, countries, duration or credit risks. The Adviser considers various factors, such as availability, cost and counterparty risk, in deciding whether, when and to what extent to enter into derivative transactions.

A Fund may use any of the above currency techniques or other derivative transactions for the purposes of enhancing Fund returns, increasing liquidity, gaining exposure to particular instruments in more efficient or less expensive ways and/or hedging risks relating to changes in interest rates and other market factors. By way of example, when the Adviser believes that the value of a particular foreign currency is expected to increase compared to the U.S. dollar, a Fund could enter into a forward contract to purchase that foreign currency at a future date. If at such future date the value of the foreign currency exceeds the then current amount of U.S. dollars to be paid by a Fund under the contract, such Fund will recognize a gain. When used for hedging purposes, a forward contract or other derivative instrument

could be used to protect against possible declines in a currency’s value where a security held or to be purchased by a Fund is denominated in that currency, or it may be used to hedge a Fund’s position by entering into a transaction on another currency expected to perform similarly to the currency of the security held or to be purchased (a “proxy hedge”).

As part of each Fund’s principal investment strategy, it will engage in a variety of trading strategies in an attempt to provide absolute (positive) returns under various market conditions, which involve many of the same types of risks as the Funds’ other investment strategies. These trading strategies include:

Capital Structure Arbitrage. This strategy attempts to take advantage of a pricing inefficiency between two or more securities of the same company. For example, a Fund may buy a senior debt instrument that the Adviser believes is undervalued, while simultaneously shorting a subordinated debt instrument of the same issuer that is believed to be overvalued.

Convertible Arbitrage. This strategy involves a Fund purchasing a convertible bond and selling short the underlying common stock. Generally this strategy seeks to profit from an improvement in credit quality of the issuer while hedging against default risk through the short sale of the underlying common stock. This strategy tends to perform better when equity markets are volatile because market volatility can positively impact the embedded optionality of the convertible bond.

Pairs Trading. This strategy attempts to profit from pricing inefficiencies between the securities of two similar companies by buying the security of one company and shorting the security of the other. In these trades, the Adviser anticipates the relationship between these securities will diverge or converge to an expected level where it may profit from the long and short positions.

Merger Arbitrage. This strategy involves investing in the securities of companies subject to publicly announced mergers, takeovers, tender offers, leveraged buyouts, spinoffs, liquidations, or similar events. For example, a Fund may simultaneously purchase stock in a company being acquired, and sell stock in the company’s acquirer, anticipating to profit from the spread between the current market price and the ultimate purchase price of the company. A Fund may purchase or sell debt and/or equity securities that may be affected by these types of corporate events.

This section contains greater detail on the risks an investor would face as a shareholder in a Fund based on the Funds’ investment objective and strategies.

Credit Risk. Failure of an issuer or borrower (under a Senior Loan) to make timely interest or principal payments, or a decline or perception of a decline in the credit quality of a bond or creditworthiness of a borrower can cause a bond’s or Senior Loan’s price to fall, potentially lowering a Fund’s share price. Each Fund, in addition to investing in investment grade securities, may also invest in non-investment grade securities, which involve greater credit risk, including the risk of default. The prices of non-investment grade securities, including Senior Loans, are more sensitive to changing economic conditions and can fall dramatically in response to negative news about the issuer/borrower or its industry, or the economy in general.

Interest Rate Risk. Prices of bonds and Senior Loans tend to move inversely with changes in interest rates. Typically, a rise in rates will adversely affect bond and Senior Loan prices and, accordingly, a Fund’s share price. The longer a Fund’s effective maturity and duration, the more its share price is likely to react to interest rates. Duration is a measure of the expected life of a fixed income security that is used to determine the sensitivity of a security’s price to changes in interest rates. Specifically, duration is the change in the value of a debt security that will result from a 1% change in interest rates, and generally is stated in years. For example, as a general rule a 1% rise in interest rates means a fall in value for every year of duration. Because interests rates in the United States and other countries are at, or near, historically low levels, there is greater risk than normal of interest rates rising as a result of changes in government policy or improving economic conditions. A rise in interest rates may lead to heightened Fund redemption activity which may cause a Fund to lose value. Interest rate changes normally have different effects on variable or floating rate securities than they do on securities with fixed interest rates. Additionally, some of the trading strategies employed by each Fund attempt to take advantage of changes in the shape, or shifts, of the yield curve. The investment adviser may be incorrect in its assessment of projected changes in the yield curve.

Prepayment and Extension Risk. When interest rates fall, the principal on Senior Loans, mortgage-backed and certain asset-backed securities may be prepaid. The loss of higher yielding underlying Senior Loans and mortgages and the reinvestment of proceeds at lower interest rates can reduce a Fund’s potential price gain in response to falling interest rates, reduce a Fund’s yield, or cause a Fund’s share price to fall. When interest rates rise, the effective duration of a Fund’s Senior Loans, mortgage-related and other asset-backed securities may lengthen due to a drop in prepayments of the underlying mortgages or other assets. This is known as extension risk and would increase a Fund’s sensitivity to rising rates and its potential for price declines. However, mortgage-backed securities and other asset-backed securities are also sensitive to changes in redemption patterns. This may result in such securities being subject to increased rates of prepayment not only in a declining interest rate environment, but also in a stable or rising interest rate environment. In the latter case, prepayment may increase due to the ability of obligors on sub-prime financial assets underlying the securities to improve their credit ratings and refinance their obligations in order to benefit from reduced interest rate costs.

Call Risk. Some bonds give the issuer the option to call, or redeem, the bonds before their maturity date. If an issuer “calls” its bond during a time of declining interest rates, a Fund might have to reinvest the proceeds in an investment offering a lower yield.

Fixed-Income Market Risk. Economic and other market developments can adversely affect fixed-income securities markets. At times, participants in debt securities markets may develop concerns about the ability of certain issuers of debt securities to make timely principal and interest payments, or they may develop concerns about the ability of financial institutions that make markets in certain debt securities to facilitate an orderly market. Those concerns can cause increased volatility in those debt securities or debt securities markets and the related derivatives markets. Under some circumstances, those concerns could cause reduced liquidity in certain debt securities markets and the related derivative traded securities. A lack of liquidity or other adverse credit market conditions may hamper a Fund’s ability to sell the debt securities in which it invests or to find and purchase suitable debt instruments.

Volatility Risk. Each Fund may invest in mortgage-backed and asset-backed securities, including those backed by sub-prime loans. Recently, the market for these loans, as well as other debt securities, has experienced significant volatility, and prices for fixed-income securities, while historically relatively stable, have experienced a higher than normal degree of volatility due to perceived credit risk and resultant sharp decrease in liquidity.

Liquidity Risk. When there is little or no active trading market for specific types of securities, it can become more difficult to sell the securities at or near their perceived value. In such a market, the value of such securities and a Fund’s share price may fall dramatically. No active trading market may exist for some Senior Loans and certain Senior Loans may be subject to restrictions on resale. The inability to dispose of Senior Loans in a timely fashion could result in losses to a Fund. Extraordinary and sudden changes in interest rates could disrupt the market for fixed-income securities and result in fluctuations in a Fund’s net asset value. Investments in many, but not all, foreign securities tend to have greater exposure to liquidity risk than domestic securities.

Senior Loan Risk. Senior Loans are business loans made to Borrowers that operate in a variety of industries and across geographic regions. Investing in Senior Loans involves investment risk and some Borrowers default on their Senior Loan repayments. The risks associated with Senior Loans are similar to the risks of junk bonds, although Senior Loans typically are senior and secured, whereas junk bonds often are subordinated and unsecured. Investments in Senior Loans typically are below investment grade and are considered speculative because of the credit risks of their Borrowers. Such Borrowers are more likely to default on their payments of interest and principal owed, and such defaults could reduce the Fund’s net asset value and income distributions. An economic downturn generally leads to a higher non-payment rate, and a Senior Loan may lose significant value before a default occurs. There is no assurance that the liquidation of the collateral would satisfy the claims of the Borrower’s obligations in the event of the non-payment of scheduled interest or principal, or that the collateral could be readily liquidated.

Foreign Securities and Currencies Risk. Each Fund may invest in foreign securities. To the extent portfolio securities are issued by foreign issuers or denominated in foreign currencies, a Fund’s investment performance is affected by the strength or weakness of the U.S. dollar against these currencies. Investing outside the U.S. involves different risks than domestic investments. The following risks may be associated with foreign investments: less liquidity; greater volatility; political instability; restrictions on foreign investment and repatriation of capital; less complete and reliable information about foreign companies; reduced government supervision of some foreign securities markets; lower responsiveness of foreign management to shareholder concerns; economic issues or developments in foreign countries; fluctuation in exchange rates of foreign currencies and risks of devaluation; imposition of foreign withholding and other taxes; dependence of emerging market companies upon commodities which may be subject to economic cycles; and emerging market risk such as limited trading volume, expropriation, devaluation or other adverse political or social developments.

Emerging Market Risk. The Driehaus Event Driven Fund may invest in emerging and developing markets and therefore, the risks described above for foreign securities are typically increased. Investments in securities of issuers located in such countries are often speculative and subject to certain special risks. The small size, limited trading volume and relative inexperience of the securities markets in these countries may make the Fund’s investments in such countries illiquid and more volatile than investments in more developed countries, and the Fund can be required to establish special custodial or other arrangements before making investments in these countries. There may be less financial or accounting information available with respect to issuers located in these countries, and it may be difficult as a result to assess the value or prospects of an investment in such issuers.

Main Risks of Derivatives. Derivative instruments (such as swaps, options, futures and forwards) often have risks similar to their underlying currency, security or index, in addition to other risks. The use of derivatives also involves risks different from, and possibly greater than, the risks associated with investing directly in the underlying assets. Derivatives can be highly volatile, illiquid and difficult to value, and there is a risk of imperfect correlation between the value of the derivative and the underlying instrument. Derivative instruments may give rise to leverage and losses on derivatives may substantially exceed the initial investment. When used for hedging, the change in value of the derivative may also not correlate specifically with the currency, security or other risk being hedged. Further, since each Fund may invest in derivatives for speculative purposes, losses from speculative positions in a derivative may be much greater than the derivative’s original cost and may be substantial. With over-the-counter derivatives, there is the risk that the other party to the transaction could default. Derivatives may be subject to pricing or “basis” risk, which exists when a particular derivative becomes extraordinarily expensive relative to historical prices or the prices of its corresponding instrument. The U.S. government and foreign governments are in the process of adopting and implementing regulations governing derivatives markets, including mandatory clearing of certain derivatives, margin and reporting requirements. The ultimate impact of the regulations remains unclear. Additional regulation of derivatives may make derivatives more costly, limit their availability or utility, otherwise adversely affect their performance or disrupt markets. In addition, the SEC has proposed a new rule that would change the regulation of the use of derivatives by registered investment companies, such as the Funds. If the proposed rule takes effect, it could limit the ability of the Funds to invest in derivatives. Additionally, to the extent the Fund is required to segregate or “set aside” (often referred to as “asset segregation”) liquid assets or otherwise cover open positions with respect to certain derivative instruments, the Fund may be required to sell portfolio instruments to meet these asset segregation requirements. There is a possibility that segregation involving a large percentage of the Fund’s assets could impede portfolio management or the Fund’s ability to meet redemption requests or other current obligations.

Options and Futures Contracts Risk. Participation in the options or futures markets involves investment risks and transaction costs to which each Fund would not be subject absent the use of these strategies. In particular, the loss from investing in futures contracts is potentially unlimited. If a Fund’s investment adviser’s prediction of movements in the underlying reference securities, interest rate or currency markets is inaccurate, such Fund could be in a worse position than if such strategies were not used. Risks inherent in the use of options, futures contracts and options on futures contracts include: (1) imperfect correlation between the price of options and futures contracts and options thereon and movements in the prices of the securities being hedged; (2) the fact that skills needed to use these strategies are different from those needed to select portfolio securities; and (3) the possible absence of a liquid secondary market for any particular instrument at any time.

Swaps Risk. Swaps can involve greater risks than direct investment in securities, because swaps may be leveraged and are subject to counterparty risk (e.g., the risk of a counterparty’s defaulting on the agreement), credit risk and pricing risk (i.e., swaps may be difficult to value). In instances where an investment in a swap is meant to be correlated to an investment in the instrument or security underlying the swap, such correlation may not be perfect and/or may not result in the expected outcome due to these added risks. In addition, it may not be possible for a Fund to liquidate a swap position at an advantageous time or price, which may result in significant losses. As a result of the Dodd-Frank Act, certain swap agreements may be cleared through a clearinghouse and traded on an exchange or swap execution facility. The regulation of swaps markets has increased over the last few years, and future regulation of the swaps markets may make swaps more costly, may limit the availability of swaps, or may otherwise adversely affect the value or performance of swaps. Any such adverse future developments could impair the effectiveness of a Fund’s swaps transactions and cause the Fund to lose value.

Credit Derivatives Risk. The use of credit derivatives is a highly specialized activity which involves strategies and risks different from those associated with ordinary portfolio security transactions. If the Adviser is incorrect in its forecasts of default risks, liquidity risk, counterparty risk, market spreads or other applicable factors, the investment performance of the Fund would diminish compared with what it would have been if these techniques were not used. Moreover, even if the Adviser is correct in its forecasts, there is a risk that a credit derivative position may correlate imperfectly with the price of the asset or liability being protected. The Fund’s risk of loss in a credit derivative transaction varies with the form of the transaction. For example, if the Fund sells protection under a credit default swap, it would collect periodic fees from the buyer and would profit if the credit of the underlying issuer or reference entity remains stable or improves while the swap is outstanding, but the Fund would be required to pay an agreed upon amount to the buyer (which may be the entire notional amount of the swap) if the reference entity defaults on the reference security. Credit default swap agreements involve greater risks than if the Fund invested in the reference obligation directly.

Deliverable and Non-Deliverable Foreign Currency Forwards and Options Risk. Deliverable and non-deliverable foreign currency forward and options contracts involve the risk that anticipated currency movements will not be accurately predicted, which could result in losses on those contracts and additional transaction costs. The use of forward and options contracts could reduce performance if there are unanticipated changes in currency prices. Options on foreign currencies are affected by the factors that influence foreign exchange rates and investments generally. The Funds’ ability to establish and close out positions on foreign currency options is subject to the maintenance of a liquid secondary market, and there can be no assurance that a liquid secondary market will exist for a particular option at any specific time.

Market Risk. Each Fund is subject to market risk, which is the possibility that securities prices overall will decline over short or long periods. Securities markets tend to move in cycles, with periods of rising prices and periods of falling prices. Values may decline in response to conditions affecting the general economy; overall market changes; local, regional or global political, social or economic instability; and currency, interest rate and commodity price fluctuations, as well as issuer or sector specific events. Although values can rebound, there is no assurance they will return to previous levels. These fluctuations are expected to have a substantial influence on the value of the Funds’ shares.

Event Risk. Event-driven opportunities may not occur as anticipated, resulting in potentially reduced returns or losses to the Driehaus Event Driven Fund as it unwinds trades where those opportunities do not materialize as anticipated. For example, investments in companies that are the subject of a publicly announced transaction carry the risk that the proposed or expected transaction may not be completed or may be completed on less favorable terms than originally expected, which may lower the Fund’s performance.

Short Sale Risk. Short sales expose a Fund to the risk that it will be required to buy the security sold short (also known as “covering” the short position) at a time when the security has appreciated in value, thus resulting in a loss to a Fund. The amount a Fund could lose on a short sale is theoretically unlimited (as compared to a long position, where the maximum loss is the amount invested). The use of short sales may also cause a Fund to have higher expenses than those of other funds due to the payment of dividends and interest, if any, in connection with the short position as well as the cost to borrow the security.

Risks of Holding Cash or Similar Instruments. During periods when a Fund holds a substantial position in cash and money market instruments, a Fund will earn less income than it would if it invested in higher yielding securities. Holding a large cash position for an extended period of time may result in a Fund not achieving its investment objective. To the extent that a Fund invests in money market mutual funds for its cash position, there will be some duplication of expenses because a Fund will bear its pro rata portion of such funds’ management fees and operational expenses.

Nondiversification. Because each Fund may invest a greater percentage of assets in a particular issuer or a small number of issuers, the Funds may be subject to greater risks and larger losses than diversified funds. The value of a Fund may vary more as a result of changes in the financial condition or the market’s assessment of the issuers than a more diversified fund.

Allocation Risk. Each Fund’s overall risk level will depend on the market sectors and countries in which a Fund is invested and the current interest rate, liquidity and credit quality of such sectors and countries. Each Fund may overweight or underweight certain companies, industries, market sectors or countries, which may cause the Fund’s performance to be more or less sensitive to developments affecting those companies, industries, market sectors or countries. Each Fund may have significant weightings in a particular companies, industries, market sectors or countries, which may subject a Fund to greater risks than less focused funds.

High Rates of Turnover. The Driehaus Event Driven Fund may experience high rates of portfolio turnover, which may result in payment by the Fund of above-average transaction costs and could result in the payment by shareholders of taxes on above-average amounts of realized investment gains, including net short-term capital gains, which are taxed as ordinary income for federal income tax purposes. To the extent the Fund engages in short sales (which are not included in calculating the portfolio turnover rate), the transaction costs incurred by the Fund are likely to be greater than the transaction costs incurred by a mutual fund that does not take short positions and has a similar portfolio turnover rate.

Manager Risk. How the investment adviser manages each Fund will impact such Fund’s performance. A Fund may lose money if the investment adviser’s investment strategy does not achieve the Fund’s objective or if the investment adviser does not implement the strategy successfully.

There are specific restrictions on the Funds’ investments. Such restrictions are detailed in the Funds’ Statement of Additional Information (“SAI”). A Fund may utilize from time to time one or more of the investment practices described below to assist it in reaching its investment objective. In addition to the principal risks discussed in the Fund Summaries, the Funds’ investments involve additional potential risks which are summarized below. The SAI also contains more detailed or additional information about certain of these practices, the potential risks and/or the limitations adopted by the Funds to help manage such risks. The Funds may not use all of these techniques or strategies or might only use them from time-to-time.

Recent Market Events Risk. The equity and debt capital markets globally have experienced unprecedented volatility in the past several years. This financial crisis had caused a significant decline in the value and liquidity of many securities and may create a higher degree of volatility in the net asset values of many mutual funds, including the Funds. Because these events are unprecedented, it is difficult to predict their magnitude or duration. Changes in market conditions will not have the same impact on all types of securities. In response to the financial crisis, the U.S. government, the Federal Reserve and certain foreign banks have taken steps to support financial markets, including by keeping interest rates at historically low levels. More recently, the Federal Reserve has reduced its market support activities. Further reduction or the withdrawal of this support could also negatively impact the value and liquidity of certain securities.

In recent years, dealer capacity in the fixed income markets have undergone fundamental changes resulting in the primary dealer inventories of corporate bonds to be at an all-time low, relative to the market size. This reduction in dealer market-making capacity has the potential to decrease liquidity and increase volatility in the fixed income markets. There may be less governmental intervention in the securities markets in the near future. If so, it could cause an increase in interest rates, which would have a negative impact on fixed income securities and could negatively affect a Fund’s net asset value.

Litigation and Enforcement Risk. Investing in companies involved in significant restructuring tends to involve increased litigation risk. This risk may be greater in the event a Fund takes a large position or is otherwise prominently involved on a bankruptcy or creditors’ committee. The expense of asserting claims (or defending against counterclaims) and recovering any amounts pursuant to settlements or judgments may be borne by a Fund. Further, ownership of companies over certain threshold levels involves additional filing requirements and substantive regulation on such owners, and if a Fund fails to comply with all of these requirements, a Fund may be forced to disgorge profits, pay fines or otherwise bear losses or other costs from such failure to comply.

Credit Default Swap Agreements Risk. A Fund may enter into credit default swap agreements as a “buyer” or “seller” of credit protection. Credit default swap agreements involve special risks because they may be difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). A Fund may be required to segregate or “earmark” assets in accordance with the terms of its swap agreements to provide assets of value and for recourse in the event of a default, bankruptcy or insolvency of the obligor of the underlying asset. Such segregation and “earmarking” will not limit a Fund’s exposure to loss. If a Fund is a buyer and no credit event occurs, the Fund loses its investment and recovers nothing. However, if a credit event occurs, the Fund as a buyer receives the full notional value for a reference obligation that may have little or no value. As a seller, a Fund typically receives a fixed rate of income throughout the term of the contract, which typically is between six months and three years, provided a credit event does not occur. If a Fund is a seller of credit default swaps, the maximum potential loss to the Fund is the notional value of the swap agreement.

Counterparty Risk. A Fund may enter into various types of derivative contracts. Some of these derivative contracts will be privately negotiated in the over-the-counter market. These contracts involve exposure to credit risk, since contract performance depends in part on the financial condition of the counterparty. If a privately negotiated over-the-counter contract calls for payments by a Fund, the Fund must be prepared to make such payments when due. In addition, if a counterparty’s creditworthiness declines, a Fund may not receive payments owed under the contract, or such payments may be delayed under such circumstances and the value of agreements with such counterparty can be expected to decline, potentially resulting in losses by a Fund.

Small- and Medium-Sized Company Risk. Each Fund may invest in companies that are smaller, less established, with less liquid markets for their securities, and therefore may be riskier investments. While small- and medium-sized companies generally have the potential for rapid growth, the securities of these companies often involve greater risks than investments in larger, more established companies because small- and medium-sized companies may lack the management experience, financial resources, product diversification and competitive strengths of larger companies. In addition, in many instances the frequency and volume of trading in small- and medium-size companies is substantially less than is typical of larger companies. The value of securities of smaller, less well known issuers can be more volatile than that of larger issuers.

Temporary Defensive Instruments, Cash or Similar Instruments. In response to adverse market, economic, political or other conditions, each Fund may take temporary defensive positions that are inconsistent with a Fund’s principal investment strategies. In such circumstances, a Fund may invest in money market instruments, including corporate or government money market mutual funds, or may hold cash with a bank. A Fund may also invest in U.S. Treasury Bills, commercial paper or repurchase agreements for these purposes. For longer periods of time, a Fund may hold a substantial position in cash and money market instruments. During such periods, a Fund will earn less income than it would if it invested in higher yielding securities. Taking a temporary defensive position or holding a large cash position for an extended period of time may result in a Fund not achieving its investment objective. To the extent that a Fund invests in money market mutual funds for its cash position, there will be some duplication of expenses because a Fund will bear its pro rata portion of such funds’ management fees and operational expenses.

Emerging Market Risk. The Driehaus Active Income Fund and Driehaus Select Credit Fund may invest in emerging and developing markets and therefore, the risks described above for foreign securities are typically increased. Investments in securities of issuers located in such countries are often speculative and subject to certain special risks. The small size, limited trading volume and relative inexperience of the securities markets in these countries may make the Fund’s investments in such countries illiquid and more volatile than investments in more developed countries, and

the Fund can be required to establish special custodial or other arrangements before making investments in these countries. There may be less financial or accounting information available with respect to issuers located in these countries, and it may be difficult as a result to assess the value or prospects of an investment in such issuers.

Forward Roll Transactions. To enhance current income, a Fund also may engage in a series of purchase and sale contracts or forward roll transactions in which the Fund sells a mortgage-related security, for example, to a financial institution and simultaneously agrees to purchase a similar security from the institution at a later date at an agreed-upon price. Similar forward roll transactions may include U.S. Treasury and U.S. agency notes and bonds.

Exchange-Traded Funds. A Fund may purchase shares of exchange-traded funds (“ETFs”) holding fixed-income securities. All ETFs are investment companies whose shares are bought and sold on a securities exchange. An ETF generally represents a portfolio of securities designed to track a particular market index. The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the index is designed to track, although lack of liquidity in a particular ETF could result in it being more volatile than the underlying portfolio of securities and trading at a discount to its net asset value. ETFs also have management fees that are part of their costs, and the Fund will indirectly bear its proportionate share of these costs.

A Fund’s investment in fixed-income ETFs, subject to the exception specified in the next sentence, currently is limited to (a) 3% of the total voting stock of any one ETF, (b) 5% of a Fund’s total assets with respect to any one ETF and (c) 10% of a Fund’s total assets in the aggregate. An exception to these limitations is found in Section 12(d)(1)(F) of the 1940 Act, which provides that the above limitations do not apply to securities purchased or otherwise acquired by a Fund if (a) immediately after such purchase or acquisition not more than 3% of the total outstanding securities of such ETF is owned by the Fund and all affiliated persons of the Fund; and (b) the Fund has not offered or sold, and is not proposing to offer or sell, any security issued by it through a principal underwriter or otherwise at a public or offering price which includes a sales load of more than 1 1/2%. In any event, a Fund will not invest more than 10% of its total assets in ETFs.

Impact of Certain Investments. A Fund may invest in a variety of securities, including initial public offerings and derivatives. Such investments may have a magnified performance impact on a Fund depending on the Fund’s size. A Fund may not experience similar performance as its assets grow or its investments change.

Depositary Receipts. A Fund may invest in foreign securities in the form of depositary receipts and/or securities traded directly on U.S. exchanges. Depositary receipts represent ownership of securities in foreign companies and are held in banks and trust companies. They include American Depositary Receipts (“ADRs”), which are traded on U.S. exchanges and are U.S. dollar-denominated.

Although ADRs do not eliminate the risks inherent in investing in the securities of foreign issuers, which include market, political, tax, currency and regulatory risk, by investing in ADRs rather than directly in securities of foreign issuers, the Fund may avoid currency risks during the settlement period for purchases or sales. In general, there is a large, liquid market in the United States for many ADRs. The information available for ADRs is subject to the accounting, auditing and financial reporting standards of the domestic market exchange on which they are traded, in which standards are more uniform and more exacting than those to which many foreign issuers may be subject. A

Fund may invest in ADRs sponsored or unsponsored by the issuer of the underlying security. In the case of an unsponsored ADR, a Fund may bear higher expenses and encounter greater difficulty in receiving shareholder communications than it would have with a sponsored ADR.

Illiquid Securities. A Fund may invest up to 15% of its net assets in illiquid securities. Not readily marketable, illiquid securities include restricted securities and repurchase obligations maturing in more than seven days. Certain restricted securities that may be resold to institutional investors under Rule 144A under the Securities Act of 1933 and Section 4(2) commercial paper may be deemed liquid under guidelines adopted by the Board of Trustees. The absence of a trading market can make it difficult to ascertain a market value for illiquid or restricted securities. Disposing of illiquid or restricted securities may involve time-consuming negotiations and legal expenses, and it may be difficult or impossible for a Fund to sell them promptly at an acceptable price.

Repurchase Agreements. A Fund may invest in repurchase agreements, provided that it will not invest more than 15% of its net assets in repurchase agreements maturing in more than seven days and any other illiquid securities. A repurchase agreement involves the sale of securities to a Fund, with the concurrent agreement of the seller to repurchase the securities at the same price plus an amount representing interest at an agreed-upon interest rate within a specified period of time, usually less than one week, but, on occasion, at a later time. Repurchase agreements entered into by a Fund will be fully collateralized and will be marked-to-market daily. In the event of a bankruptcy or other default of a seller of a repurchase agreement, a Fund could experience both delays in liquidating the underlying securities and losses, including: (a) possible decline in the value of the collateral during the period while a Fund seeks to enforce its rights thereto; (b) possible subnormal levels of income and lack of access to income during this period; and (c) expenses of enforcing its rights.

When-Issued and Delayed-Delivery Securities; Reverse Repurchase Agreements. A Fund may purchase or sell securities on a when-issued or delayed-delivery basis. Although the payment and interest terms of these securities are established at the time a Fund enters into the commitment, the securities may be delivered and paid for a month or more after the date of purchase, when their value may have changed. A Fund makes such purchase commitments only with the intention of actually acquiring the securities, but may sell the securities before the settlement date if the Adviser deems it advisable for investment reasons.

A Fund may enter into reverse repurchase agreements with banks and securities dealers. A reverse repurchase agreement is a repurchase agreement in which a Fund is the seller of, rather than the investor in, securities and agrees to repurchase them at an agreed-upon time and price. Use of a reverse repurchase agreement may be preferable to a regular sale and later repurchase of securities because it avoids certain market risks and transaction costs.

Lending Portfolio Securities. A Fund may lend its portfolio securities to broker-dealers and banks, provided that it may not lend securities if, as a result, the aggregate value of all securities loaned would exceed 33 1/3% of its total assets. Any such loan must be continuously secured by collateral (cash or U.S. government securities). In the event of bankruptcy or other default of the borrower, a Fund could experience delays in both liquidating the loan collateral and recovering the loaned securities and losses.

For the most recent fiscal year, each Fund paid the Adviser an annual investment management fee on a monthly basis as follows:

* The Adviser has entered into a contractual agreement to waive a portion of its management fee and to reimburse operating expenses to the extent necessary to cap the Fund’s ordinary annual operating expenses, excluding interest, taxes, brokerage commissions, dividends and interest on short sales, other investment-related costs and extraordinary expenses, at 2.00% of average daily net assets until August 25, 2016. Because of this agreement, the Fund may pay the Adviser less than the contractual management fee.

Disclosure relating to the material factors and conclusions with respect to those factors that formed the basis for the Board of Trustees’ continuation of the Funds’ investment advisory agreements may be reviewed in the Funds’ annual report to shareholders for the fiscal year ended December 31, 2015. Shareholder reports may be obtained by calling 1-877-779-0079, or by visiting www.driehaus.com or the SEC’s web site at www.sec.gov.

Portfolio Manager. Both Funds are managed by K.C. Nelson. Mr. Nelson has been the portfolio manager for each Fund since its inception and is responsible for making investment decisions on behalf of the Funds.

Mr. Nelson received his B.A. in Economics from Vanderbilt University in 1998 and an M.B.A. from Duke University in 2004. In 1998, Mr. Nelson joined J.C. Bradford & Co., where he was an analyst in the firm’s investment banking division. In 1999, he joined Andersen Corporate Finance LLC and worked as a senior analyst primarily focusing on buy and sell-side merger and acquisitions transactions across a number of industries. In 2003, Mr. Nelson joined Akela Capital where he worked as an assistant portfolio manager focusing on convertible arbitrage. In 2006, he joined Lotsoff Capital Management where he was a senior portfolio manager of the firm’s credit-oriented strategies. In 2009, Mr. Nelson joined the Adviser as portfolio manager focusing on the Adviser’s credit-oriented strategies.

Portfolio Manager of Driehaus Active Income Fund. Elizabeth Cassidy has been a portfolio manager of the Driehaus Active Income Fund since July 1, 2015 and, together with Mr. Nelson, is responsible for making investment decisions on behalf of the Fund. Ms. Cassidy served as an assistant portfolio manager of the Driehaus Active Income Fund from November 1, 2009 to June 30, 2015.

Assistant Portfolio Manager of Driehaus Select Credit Fund. Ms. Cassidy has been an assistant portfolio manager of Driehaus Select Credit Fund since its inception and supports Mr. Nelson with investment research, security selection and portfolio construction. She has certain responsibilities for investment decision-making for the Driehaus Select Credit Fund, subject to Mr. Nelson’s approval.

Ms. Cassidy received her B.A. in Economics and French from Middlebury College in 1999 and an M.B.A. from Duke University in 2004. In 1999, Ms. Cassidy joined Credit Suisse First Boston where she was an analyst and then an associate in the firm’s Investment Banking Division, focusing on buy and sell-side merger and acquisition transactions and debt and equity financings in the consumer and industrial industries. In 2004, she joined Bank of America Merrill Lynch as an associate and then as a vice president and research analyst focused on distressed securities in the Corporate Principal Investing & Trading group. In November 2009, Ms. Cassidy joined the Adviser as an assistant portfolio manager of the firm’s credit-oriented strategies.

Portfolio Manager. The Driehaus Event Driven Fund is managed by K.C. Nelson. Mr. Nelson has been the portfolio manager for the Fund since its inception on August 26, 2013 and is responsible for making investment decisions on behalf the Fund. Mr. Nelson’s background is described under “Driehaus Active Income Fund and Driehaus Select Credit Fund — Portfolio Manager.”

Assistant Portfolio Manager. Michael Caldwell has been an assistant portfolio manager of the Driehaus Event Driven Fund since the Fund’s inception and has certain responsibilities for investment decision-making, subject to the approval of Mr. Nelson.

Mr. Caldwell received his B.S. in biomedical engineering from Yale University in 2005. Mr. Caldwell began his career as co-founder of Ivy Concierge, LLC where he served as a managing director from 2005 to 2007. He also worked as a graduate research associate for the department of biomedical engineering at Yale University in 2007. He joined the Adviser in 2008 as an associate analyst focusing on micro and small cap stocks.

Assistant Portfolio Manager. Yoav Sharon has been an assistant portfolio manager of the Driehaus Event Driven Fund since February 1, 2015 and has certain responsibilities for investment decision-making, subject to the approval of Mr. Nelson.

Mr. Sharon earned his B.A. from Northwestern University in 2003 and M.B.A. in finance, international business, and management and strategy from the Kellogg Graduate School of Management at Northwestern University in 2010. He joined the Adviser in 2012. Prior to joining the Adviser, Mr. Sharon worked at Peak6 Investments as a senior analyst and trader. Prior to that, he served as a managing member of a firm he helped found, Raya Trading, and as a senior trader at STR Trading Partners.

Assistant Portfolio Manager. Matthew Schoenfeld has been an assistant portfolio manager of the Driehaus Event Driven Fund since July 1, 2015 and has certain responsibilities for investment decision-making, subject to the approval of Mr. Nelson.

Mr. Schoenfeld graduated from Columbia University in 2008 with a B.A. in Political Science, and received his J.D. from Harvard Law School in 2012. Prior to joining the Adviser in 2014, Mr. Schoenfeld was a member of the Special Situations Group at Morgan Stanley, where he focused on merger arbitrage and event-driven investing.

The SAI provides additional information about the portfolio managers’ and assistant portfolio managers’ compensation, other accounts managed and ownership of securities in the Funds.

Shareholder Services Plan. Each Fund has adopted a Shareholder Services Plan that authorizes the Fund to make payments for services provided on behalf of the Fund. Payments may be made to banks, other institutions and service professionals (including investment advisers and broker-dealers) and other entities for certain services to investors in the Fund. Such services may include, but shall not be limited to: transfer agent and sub-transfer agent services; aggregating and processing purchase and redemption orders; providing periodic statements; receiving and transmitting funds; processing dividend payments; providing sub-accounting services; forwarding shareholder communications; receiving, tabulating and transmitting proxies; responding to inquiries and performing such other related services as the Fund may request. Each Plan allows for annual payments not to exceed 0.25% of average daily net assets.

Administrator. UMB Fund Services, Inc. (the “Administrator”) is the administrator for the Funds. In such capacity, UMB Fund Services, Inc. assists the Funds in aspects of their administration and operation, including certain accounting services.

Transfer Agent. UMB Fund Services, Inc. (the “Transfer Agent”) is the agent of the Funds for the transfer of shares, disbursement of dividends and maintenance of shareholder account records.

Each Fund’s net asset value is determined as of the close of the New York Stock Exchange (“NYSE”) (normally 3:00 p.m., Central time) on each day the NYSE is open for trading. Purchases and redemptions are made at a Fund’s net asset value per share next calculated after receipt of your purchase or redemption order in good form. Net asset value per share is determined by dividing the difference between the values of a Fund’s assets and liabilities by the number of its shares outstanding. The Funds’ holdings are typically valued using readily available market quotations and portfolio currency positions are based on exchange rates provided by an independent pricing service. Securities and foreign currencies may be valued using methods approved by the Board of Trustees when: (i) securities cannot be priced through a readily available market quotation provided by a pricing service and no broker-dealer quotations are available or are determined not to be reasonable, or (ii) an event occurs that affects the value of a portfolio security between the time its price is determined in its local market or exchange and the close of the NYSE where the event would materially affect net asset value. In instances where a security or securities held by a Fund are fair valued pursuant to these methodologies, the Fund’s value for a security is likely to be different from the last quoted market price. In addition, due to the subjective and variable nature of fair value pricing, it is possible that the value determined for a particular security may be materially different from the value realized upon the security’s sale.

The Driehaus Event Driven Fund has the following minimum investments, which may be waived at the discretion of DS LLC:

for Fund share purchases under $100,000. For purchases of $100,000 or more, the Funds accept only wire transfers.

Driehaus Mutual Funds will not accept the following forms of payment for Fund shares:

Any expense incurred as a result of a returned check will be borne by the shareholder. The Funds will charge a $20 fee against your account, in addition to any loss sustained by the Fund, for any check returned for insufficient funds. If you are adding to your existing account, fill out the detachable investment slip from an account statement or indicate your Fund account number and the name(s) in which the account is registered directly on the check. Send to:

For Further Credit to: Investor Account Number; Name(s) of Investor(s); SSN or TIN; Name of Fund to be Purchased

New investors who would like to participate in the Automatic Investment Plan or make additional investments in shares of the Funds by ACH should complete the appropriate section of the account application and mail it to Driehaus Mutual Funds at the address included in the By Mail section above. Current investors should complete the Optional Account Services Form to add either or both privileges to their account(s). To obtain either form, call 1-877-779-0079 or visit www.driehaus.com.

Financial institutions that enter into a sales agreement with DS LLC or the Trust (“Intermediaries”) may accept purchase and redemption orders on behalf of the Funds. If communicated in accordance with the terms of the sales agreement, a purchase or redemption order will be deemed to have been received by the Funds when the Intermediary accepts the order. In certain instances, an Intermediary (including Charles Schwab & Co., Inc.) may designate other third-party financial institutions (“Sub-Designees”) to receive orders from their customers on the Funds’ behalf. The Intermediary is liable to the Funds for its compliance with the terms of the sales agreement and the compliance of each Sub-Designee. All orders will be priced at the relevant Fund’s net asset value next computed after they are accepted by the Intermediary or Sub-Designee, provided that such orders are communicated in accordance with the terms of the applicable sales agreement.

Each Fund may pay an annual shareholder services fee not to exceed 0.25% of the Fund’s average net assets to firms that provide shareholder administrative and/or sub-transfer agency services to individual shareholders or beneficial owners where the firm maintains an omnibus account with the Fund.

DS LLC makes payments, and the Adviser reimburses DS LLC for such payments, out of its own resources to Intermediaries for providing shareholder servicing or distribution related activities. Each Fund may reimburse DS LLC for payments it makes to Intermediaries for shareholder services at a rate not to exceed 0.25% of the Fund’s average net assets. No payments are made by the Funds for distribution related activities of the Funds.

Shares of each Fund are typically offered only to residents of states and other jurisdictions in which the shares are available for purchase. The Funds do not generally sell shares to persons or entities, including foreign financial institutions, foreign shell banks and private banking accounts, residing outside the U.S., its territories and possessions, even if they are U.S. citizens or lawful permanent residents, except to persons with U.S. military APO or FPO addresses. However, under limited circumstances, the Funds reserve the right to sell shares to such persons or entities residing outside the U.S., its territories and possessions. The Funds reserve the right not to accept any purchase order. The Funds also reserve the right to change its investment minimums without notice. For all purchases, confirmations are sent to the investor in writing except purchases made by reinvestment of dividends, which will be confirmed quarterly.

“Buying a Dividend”. Unless you are purchasing Fund shares through a tax-advantaged account (such as an IRA), buying Fund shares at a time when a Fund has undistributed income or gains can cost you money in taxes. See “Distributions and Taxes — Buying a Distribution” below. Contact the Fund for information concerning when distributions will be paid.

Driehaus Active Income Fund and Driehaus Select Credit Fund. The Driehaus Active Income Fund and Driehaus Select Credit Fund are each closed to most new investors in an effort to slow the pace of inflows and protect the integrity of their investment process. You may purchase Driehaus Active Income Fund or Driehaus Select Credit Fund

shares and reinvest dividends and capital gains you receive on your holdings of Fund shares in additional shares of the Fund if you are:

These restrictions apply to investments made directly through DS LLC, as well as investments made through Intermediaries. Intermediaries that maintain omnibus accounts are not allowed to open new sub-accounts for new investors, unless the investor meets the criteria listed above. Once an account is closed, additional investments will not be accepted unless the investor meets the criteria listed above. Investors may be required to demonstrate eligibility to purchase shares of the Fund before an investment is accepted. The Funds reserve the right to (i) eliminate any of the exceptions listed above and impose additional restrictions on purchases of Fund shares; and (ii) make additional exceptions, that, in their judgment, do not adversely affect the Adviser’s ability to manage the Fund.

Certain requests for redemption must be signed by the shareholder with a signature guarantee. See “Shareholder Services and Policies — Medallion Signature Guarantees.”

A shareholder would be notified that the account is below the minimum and would have 30 days to increase the account before the account is redeemed.

A redemption order will be executed at the price which is the net asset value determined after proper redemption instructions are received. The redemption price received depends upon the Fund’s net asset value per share at the time of redemption. Therefore, it may be more or less than the price originally paid for the shares and may result in a realized capital gain or loss for federal income tax purposes.

manner described above, even if a Fund delays payment of the proceeds. For payments sent by wire or ACH, the Funds are not responsible for the efficiency of the federal wire or ACH systems or the shareholder’s financial services firm or bank. The shareholder is responsible for any charges imposed by the shareholder’s financial services firm or bank. Payment for shares redeemed within 10 business days after purchase by personal check or 5 business days after purchase by ACH will be delayed until the applicable escrow period has expired. Shares purchased by certified check or wire are not subject to the escrow period.

The Trust’s Board of Trustees has adopted policies and procedures in an effort to discourage and prevent market timing, which do not accommodate frequent purchases and redemptions of shares. The Funds’ Adviser receives trading activity information from the Transfer Agent and monitors Fund inflows and outflows for suspected market timing activity using certain activity thresholds. The Adviser monitors the trading activity of direct shareholders and trading activity through Intermediaries. This monitoring may result in a Fund’s rejection or cancellation of future purchase or exchange transactions in that shareholder’s account(s) without prior notice to the shareholder. Under current procedures, such rejection or cancellation would occur within one business day after the Adviser identifies the suspected market timing activity.

Shares of the Funds may be purchased directly from the Funds (through the Transfer Agent) or through omnibus arrangements with broker-dealers or other Intermediaries that aggregate shareholder transactions. The Funds do not know the identity of the beneficial owners of many of the accounts opened through Intermediaries and consequently relies on the Intermediaries to comply with the Funds’ policies and procedures on frequent purchases and redemptions. In some instances, the Funds allow an Intermediary to impose frequent trading restrictions that differ from those of the Funds. Investors who purchase shares through an Intermediary should review any disclosures provided by the Intermediary with which they have an account to determine what frequent trading restrictions may apply to their account. The Funds may direct any Intermediary to block any shareholder account from future trading in the Funds if market timing is suspected or discovered.

Exchanging Shares. Any shares of a Fund that you have held for the applicable escrow period may be exchanged for shares of any other Driehaus Mutual Fund in an identically registered account, provided the fund to be acquired has the same transfer agent, is available for purchase, is registered for sale in your state of residence and you have met the minimum initial investment requirements. Procedures applicable to the purchase and redemption of a Fund’s shares are also applicable to exchanging shares, including the prices that you receive and pay for the shares you exchange. You will automatically have the ability to exchange shares of any Driehaus Mutual Fund, subject to the qualifications noted above, by telephone unless you indicate on your application that you do not want this privilege. The Funds reserve the right to limit the number of exchanges between Funds and to reject any exchange order. The Funds reserve the right to modify or discontinue the exchange privilege at any time upon 60 days’ written notice. For federal income tax purposes, an exchange is treated the same as a sale and you may recognize a capital gain or loss upon an exchange, depending upon the cost or other basis of the shares exchanged.

Telephone Transactions. Shareholders will automatically have telephone redemption by check and exchange privileges unless they indicate on their account application that they do not want these privileges. Shareholders may initially purchase shares by telephone via bank wire. Shareholders engaging in telephone transactions should be aware of the risks associated with this type of transaction as compared to written requests. Although the Funds employ reasonable procedures to confirm that instructions received by telephone are genuine, a shareholder authorizing a transaction by telephone bears the risk of any resulting losses, unless the Funds or their service providers fail to employ these measures. In such cases, the Funds or their service providers may be liable for losses arising from unauthorized or fraudulent instructions. In addition, the Funds reserve the right to record all telephone conversations. Confirmation statements for telephone transactions should be reviewed for accuracy immediately upon receipt by the shareholder.

Unusual Circumstances. During times of unusual economic or market changes, telephone redemption and exchange privileges may be difficult to implement. In addition, in unusual circumstances, the Funds may temporarily suspend the processing of redemption requests, or may postpone payment of proceeds for up to seven days or longer as allowed by federal securities laws. In the event that you are unable to reach the Funds by telephone, requests may be mailed to the Funds at the address listed in “How to Redeem Shares.”

A Note on Mailing Procedures. In order to provide greater convenience to our shareholders and cost savings to the Funds by reducing the number of duplicate shareholder mailings, only one copy of most proxy statements, financial reports and prospectuses will be mailed to households, even if more than one person in a household holds shares of the Fund. Separate shareholder statements will continue to be mailed for each Fund account. If you want additional copies or do not want your mailings to be “householded,” please call 1-877-779-0079 or write Driehaus Mutual Funds, c/o UMB Fund Services, Inc., P.O. Box 2175, Milwaukee, WI 53201-2175.

Reinvestment of Distributions. Dividends and distributions payable by a Fund are automatically reinvested in additional shares of the Fund unless the investor indicates otherwise on the application or subsequently notifies the Fund, in writing, of the desire to not have dividends automatically reinvested. Reinvested dividends and distributions are treated the same for federal income tax purposes as dividends and distributions received in cash.

If the U.S. Postal Service cannot deliver your check or if your check remains uncashed for six months, the Funds reserve the right to reinvest your distribution check in your account at the net asset value on the day of the reinvestment and to reinvest all subsequent distributions in shares of the applicable Fund. Interest will not accrue on amounts represented by uncashed distribution or redemption checks.

Federal Income Tax Status of Dividends and Other Distributions. Distributions by a Fund of investment company taxable income (determined without regard to the deduction for dividends paid) are generally subject to federal income tax at ordinary income tax rates. However, a portion of such distributions that were derived from certain corporate dividends may qualify for either the 70% dividends received deduction available to corporate shareholders under the Internal Revenue Code of 1986, as amended (the “Code”), or the reduced rates of federal income taxation for “qualified dividend income” currently available to individual and other noncorporate shareholders under the Code, provided certain holding period and other requirements are satisfied. However, dividends received by a Fund from foreign corporations are not expected to qualify for the dividends received deduction, and dividends received from certain foreign corporations may not qualify for treatment as qualified dividend income. It is not expected that a significant portion of the Funds’ distributions will qualify for the dividends received deduction or qualified dividend income treatment. Distributions of net capital gains, if any, are generally taxable as long-term capital gains for federal income tax purposes regardless of how long a shareholder has held shares of a Fund. The U.S. federal income tax status of all distributions will be designated by a Fund and reported to its shareholders annually. Distributions are taxable in the year they are paid, whether they are taken in cash or reinvested in additional shares, except that certain distributions declared to shareholders of record in the last three months of the calendar year and paid in the following January are taxable as if paid on December 31 of the year declared.

Taxability of Distributions to Individuals and Other Noncorporate Shareholders (taxable years beginning in 2016)

Investment income received by a Fund from sources within foreign countries may be subject to foreign income taxes withheld at the source. The U.S. has entered into tax treaties with many foreign countries that generally entitle a Fund to a reduced rate of tax or exemption from tax on such income. It is impossible to determine the effective rate of foreign tax in advance since the amount of a Fund’s assets to be invested within various countries will fluctuate and the extent to which tax refunds will be recovered is uncertain. Each Fund intends to operate so as to qualify for treaty-reduced tax rates where applicable.

or deduction (subject to certain limitations) on their federal income tax returns for, and will be required to treat as part of the amounts distributed to them, their pro rata portion of the income taxes paid by the Fund to foreign countries (which taxes relate primarily to investment income). Under the Code, no deduction for foreign taxes may be claimed by individual shareholders who do not elect to itemize deductions on their federal income tax returns, although such a shareholder may be able to claim a credit for foreign taxes paid and in any event will be treated as having taxable income in the amount of the shareholder’s pro rata share of foreign taxes paid by the Fund. If a Fund does not make such an election, the foreign taxes paid by the Fund will reduce the Fund’s net investment income. In such a case, shareholders will not be able to claim either a credit or a deduction for their pro rata portion of such taxes paid by the Fund, nor will shareholders be required to treat as part of the amounts distributed to them their pro rata portion of such taxes paid.

Redemption of Fund Shares. Unless a shareholder is a tax-exempt investor or investing through a tax-advantaged account, a redemption or exchange of Fund shares is generally considered a taxable event for federal income tax purposes. Depending on the purchase price and the sale price of the shares redeemed or exchanged, the shareholder may have a gain or loss on the transaction. The gain or loss will generally be treated as a long-term capital gain or loss if the shareholder held the shares for more than one year. If the shareholder held the shares for one year or less, the gain or loss will generally be treated as a short-term capital gain or loss. Short-term capital gain is taxable at ordinary income tax rates for federal income tax purposes. Shareholders may be limited in their ability to utilize capital losses. Any loss realized on sales or exchanges of Fund shares held six months or less will be treated as a long-term capital loss to the extent of any long-term capital gain distributions received by the shareholder with respect to such shares.

Cost Basis Reporting. The Funds are required to report to the IRS, and to furnish to Fund shareholders, detailed cost basis and holding period information for Fund shares acquired on or after January 1, 2012 (“covered shares”), that are redeemed on or after that date. These requirements do not apply to investments through a tax-advantaged arrangement, such as a 401(k) or an IRA. If you redeem covered shares during any year, the Funds will report the following information to the IRS and to you on Form 1099-B: (i) the cost basis of such shares, (ii) the gross proceeds you received on the redemption, and (iii) the holding period for the redeemed shares. The Funds’ default method for calculating the cost basis of covered shares is the average cost basis. You should contact your tax or other advisor about the application of the cost basis reporting rules to you, particularly whether you should elect a cost basis calculation method other than the default average cost basis. If you wish to change your cost basis methodology, please see the Cost Basis Election Form at www.driehaus.com or call 1-877-779-0079. If you hold your Fund shares through a financial intermediary, please contact your representative regarding the reporting of cost basis and available elections for your account.

The financial highlights table is intended to help you understand the Fund’s financial performance for the past five years. Certain information reflects financial results for a single Fund share. The total returns in the table represent the rate that an investor would have earned (or lost) on an investment in the Fund (assuming reinvestment of all dividends and distributions). The information below has been audited by Ernst & Young LLP, whose report, along with the Fund’s financial statements, is included in the Fund’s annual report, which is available, without charge, upon request.

The financial highlights table is intended to help you understand the Fund’s financial performance since inception. Certain information reflects financial results for a single Fund share. The total returns in the table represent the rate that an investor would have earned (or lost) on an investment in the Fund (assuming reinvestment of all dividends and distributions). The information below has been audited by Ernst & Young LLP, whose report, along with the Fund’s financial statements, is included in the Fund’s annual report, which is available, without charge, upon request.

More information on these Funds is available without charge, upon request, including the following:

The SAI provides more details about the Funds and their policies. A current SAI is on file with the SEC and is incorporated by reference.

Text-only versions of Fund documents, including the SAI, annual and semi-annual reports can be viewed online or downloaded without charge from: www.driehaus.com

You can also obtain copies by visiting the SEC’s Public Reference Room in Washington, DC (1-202-551-8090) or by sending your request by email to publicinfo@sec.gov or go to the SEC’s Public Reference Section, Washington, DC 20549-1520 (a duplicating fee is charged).

This Statement of Additional Information (“SAI”) is not a prospectus, but provides additional information that should be read in conjunction with the Funds’ prospectus dated April 30, 2016 and any supplements thereto (“Prospectus”). The Prospectus may be obtained at no charge by calling 1-800-560-6111.

The financial statements for the Funds appearing in the combined Annual Report to Shareholders for the fiscal year ended December 31, 2015 have been audited by Ernst & Young LLP, independent registered public accounting firm, and are incorporated herein by reference.

Driehaus Emerging Markets Growth Fund, Driehaus Emerging Markets Small Cap Growth Fund, Driehaus Frontier Emerging Markets Fund, Driehaus International Small Cap Growth Fund and Driehaus Micro Cap Growth Fund (individually, a “Fund” and collectively, the “Funds”) are each a nondiversified series of Driehaus Mutual Funds (the “Trust”), an open-end management investment company. Driehaus Capital Management LLC (“DCM” or the “Adviser”) provides management and investment advisory services to each Fund. The Trust is a Delaware statutory trust organized under an Agreement and Declaration of Trust (“Declaration of Trust”) dated May 31, 1996, as subsequently amended and restated as of June 6, 2013, and as of the date of this SAI has eight series, including the Funds. The Trust or a Fund may be terminated (i) by the affirmative vote of at least two-thirds of the outstanding shares of the Trust (or Fund) at any meeting of shareholders, or (ii) by an instrument in writing, without a meeting, signed by a majority of the Trustees and consented to by at least two-thirds of the outstanding shares, or (iii) by the Trustees by written notice to shareholders. The Trust may issue an unlimited number of shares, in one or more series or classes as its Board of Trustees (the “Board”) may authorize. The Driehaus Emerging Markets Growth Fund commenced operations on December 31, 1997. The Driehaus Frontier Emerging Markets Fund commenced operations on May 4, 2015. After succeeding to the assets of the Driehaus International Opportunities Fund, L.P., the Driehaus International Small Cap Growth Fund commenced operations on September 17, 2007. After succeeding to the assets of the Driehaus Emerging Markets Small Cap Growth Fund, L.P., the Driehaus Emerging Markets Small Cap Growth Fund commenced operations on August 22, 2011. After succeeding to the assets of the Driehaus Micro Cap Fund, L.P. and the Driehaus Institutional Micro Cap Fund, L.P., the Driehaus Micro Cap Growth Fund commenced operations on November 18, 2013.

Each share of a Fund is entitled to participate pro rata in any dividends and other distributions declared by the Board on shares of that series, and all shares of a Fund have equal rights in the event of liquidation of that series.

As a Delaware statutory trust, the Trust is not required to hold annual shareholder meetings. However, special meetings may be called for purposes such as electing or removing Trustees, changing fundamental policies, or approving an investment advisory contract. If requested to do so by the holders of at least 10% of the Trust’s outstanding shares, the Trust will call a special meeting for the purpose of voting upon the question of removal of a Trustee or Trustees and will assist in the communication with other shareholders as if the Trust were subject to Section 16(c) of the Investment Company Act of 1940, as amended (the “1940 Act”). All shares of all series of the Trust are voted together in the election of Trustees. On any other matter submitted to a vote of shareholders, shares are voted in the aggregate and not by an individual Fund, except that shares are voted by an individual Fund when required by the 1940 Act or other applicable law, or when the Board determines that the matter affects only the interests of one Fund, in which case shareholders of the unaffected Fund are not entitled to vote on such matters.

Covered Action is filed in a court other than either (a) the U.S. District Court for the District of Delaware or the Court of Chancery of the State of Delaware or the Superior Court of the State of Delaware; or (b) the U.S. District Court for the District of Illinois or the Circuit Court of the State of Illinois (a “Foreign Action”) in the name of any shareholder, such shareholder shall be deemed to have consented to (i) the personal jurisdiction of the U.S. District Court for the District of Delaware or the Court of Chancery of the State of Delaware and the Superior Court of the State of Delaware or (ii) the U.S. District Court for the District of Illinois or the Circuit Court of the State of Illinois in connection with any action brought in any such courts to enforce the preceding sentence (an “Enforcement Action”) and (ii) having service of process made upon such shareholder in any such Enforcement Action by service upon such shareholder’s counsel in the Foreign Action as agent for such shareholder.

The By-Laws provide that any person purchasing or otherwise acquiring or holding any interest in shares of beneficial interest of the Trust shall be (i) deemed to have notice of and consented to the provisions of the foregoing paragraph and (ii) deemed to have waived any argument relating to the inconvenience of the forums referenced above in connection with any action or proceeding described in the foregoing paragraph.

This forum selection provision may limit a shareholder’s ability to bring a claim in a judicial forum that it finds favorable for disputes with Trustees, officers or other agents of the Trust and its service providers, which may discourage such lawsuits with respect to such claims. If a court were to find the forum selection provision contained in the By-Laws to be inapplicable or unenforceable in an action, the Trust may incur additional costs associated with resolving such action in other jurisdictions.

As with all investments, at any given time the value of your shares in the Fund(s) may be worth more or less than the price you paid. The value of your shares depends on the value of the individual securities owned by the Funds which will go up and down depending on the performance of the company that issued the security, general market and economic conditions, and investor confidence. In addition, the market for securities generally rises and falls over time, usually in cycles. During any particular cycle, an investment style may be in or out of favor. If the market is not favoring the Funds’ style, the Funds’ gains may not be as big as, or its losses may be larger than, those of other equity funds using different investment styles.

With the increased use of technologies such as the Internet and the use of electronic data, the Funds and their third-party service providers are susceptible to operational and information security risks. In general, cyber incidents can result from deliberate attacks or unintentional events. Cyber attacks include, but are not limited to, gaining unauthorized access to digital systems for purposes of misappropriating assets or sensitive information, corrupting data, or causing operational disruption. Cyber attacks may also be carried out in a manner that does not require gaining unauthorized access, such as causing denial-of-service attacks on websites. Cyber security failures or breaches of a Fund’s third-party service provider (including, but not limited to, the Adviser, administrator, custodian and transfer agent) or the issuers of securities in which the Fund invests, have the ability to cause disruptions and impact business operations, potentially resulting in financial losses, the inability of Fund shareholders to transact business, violations of applicable privacy and other laws, regulatory fines, penalties, reputational damage, reimbursement or other compensation costs, and/or additional compliance costs. In addition, substantial costs may be incurred in order to prevent any cyber incidents in the future. The Funds and their shareholders could be

negatively impacted as a result. Although the Funds and their service providers have business continuity plans and other safeguards in place, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified.

Driehaus Emerging Markets Growth Fund, Driehaus Emerging Markets Small Cap Growth Fund, Driehaus Frontier Emerging Markets Fund and Driehaus International Small Cap Growth Fund invest in foreign securities, which may entail a greater degree of risk (including risks relating to exchange rate fluctuations, taxes or expropriation of assets) than investments in securities of domestic issuers. These Funds may also purchase foreign securities in the form of European Depositary Receipts (“EDRs”), Global Depositary Receipts (“GDRs”) or other securities representing underlying shares of foreign issuers. Additionally, the Funds, including Driehaus Micro Cap Growth Fund, may purchase foreign securities in the form of American Depositary Receipts (“ADRs”). Positions in these securities are not necessarily denominated in the same currency as the common stocks into which they may be converted. ADRs are receipts typically issued by an American bank or trust company evidencing ownership of the underlying securities. EDRs and GDRs are European receipts evidencing a similar arrangement. Generally, ADRs are designed for the U.S. securities markets and EDRs and GDRs are designed for use in European and other foreign securities markets. The Funds may invest in sponsored or unsponsored ADRs. In the case of an unsponsored ADR, each Fund is likely to bear its proportionate share of the expenses of the depository and it may have greater difficulty in receiving shareholder communications than it would have with a sponsored ADR.

With respect to equities that are issued by foreign issuers or denominated in foreign currencies, a Fund’s investment performance is affected by the strength or weakness of the U.S. dollar against these currencies. For example, if the dollar falls in value relative to the Nigerian Naira, the dollar value of a Naira-denominated stock held in a Fund will rise even though the price of the stock remains unchanged. Conversely, if the dollar rises in value relative to the Naira, the dollar value of the Naira-denominated stock will fall. (See discussion of transaction hedging and portfolio hedging under “Currency Exchange Transactions.”)

Risks. Investors should understand and consider carefully the risks involved in foreign investing. Investing in foreign securities and positions which are generally denominated in foreign currencies, and utilization of forward currency contracts, involve certain considerations comprising both risks and opportunities not typically associated with investing in U.S. securities. These considerations include: fluctuations in exchange rates of foreign currencies; possible imposition of exchange control regulation or currency restrictions that would prevent cash from being brought back to the United States; less public information with respect to issuers of securities; less governmental supervision of stock exchanges, securities brokers and issuers of securities; lack of uniform accounting, auditing and financial reporting standards; lack of uniform settlement periods and trading practices; less liquidity and frequently greater price volatility in foreign markets than in the United States; possible imposition of foreign taxes; investment in securities of companies in developing as well as developed countries; and sometimes less advantageous legal, operational and financial protections applicable to foreign subcustodial arrangements.

Although the Funds will try to invest in companies and governments of countries having stable political environments, there is the possibility of expropriation or confiscatory taxation, seizure or nationalization of foreign bank deposits or other assets, establishment of exchange controls, the adoption of foreign government restrictions, or other adverse political, social or diplomatic developments that could affect investment in these nations.

Foreign Currency Exchange Transactions. Currency exchange transactions may be conducted either through forward currency contracts (“forward currency contracts”) or on a spot (i.e., cash) basis at the spot rate for purchasing currency prevailing in the foreign exchange market. Forward currency contracts are contractual agreements to purchase or sell a specified currency at a specified future date (or within a

specified time period) and price set at the time of the contract. Forward currency contracts are usually entered into with banks and broker-dealers, are not exchange traded and are usually for less than one year, but may be renewed.

Forward currency transactions may involve currencies of the different countries in which the Driehaus Emerging Markets Growth Fund, Driehaus Emerging Markets Small Cap Growth Fund, Driehaus Frontier Emerging Markets Fund and Driehaus International Small Cap Growth Fund may invest and serve as hedges against possible variations in the exchange rate between these currencies. Each Fund’s currency transactions are limited to transaction hedging and portfolio hedging involving either specific transactions or portfolio positions, except to the extent described under “Synthetic Foreign Money Market Positions.” Transaction hedging is the purchase or sale of forward currency contracts with respect to specific receivables or payables of each Fund accruing in connection with settlement of the purchase and sale of its portfolio securities. Portfolio hedging is the use of forward currency contracts with respect to portfolio security positions denominated or quoted in a particular currency. Portfolio hedging allows the Adviser to limit or reduce exposure in a foreign currency by entering into a forward contract to sell such foreign currency (or another foreign currency that acts as a proxy for that currency) so that the U.S. dollar value of certain underlying foreign portfolio securities can be approximately matched by an equivalent U.S. dollar liability. No Fund may engage in portfolio hedging with respect to the currency of a particular country to an extent greater than the aggregate market value (at the time of making such sale) of the securities held in its portfolio denominated or quoted in that particular currency, except that each Fund may hedge all or part of its foreign currency exposure through the use of a basket of currencies or a proxy currency where such currency or currencies act as an effective proxy for other currencies. In such a case, each Fund may enter into a forward contract where the amount of the foreign currency to be sold exceeds the value of the securities denominated in such currency. The use of this basket hedging technique may be more efficient and economical than entering into separate forward currency contracts for each currency held in each Fund. The Funds may not engage in “speculative” currency exchange transactions.

At the maturity of a forward contract to deliver a particular currency, each Fund may either sell the portfolio security related to such contract and make delivery of the currency, or retain the security and either acquire the currency on the spot market or terminate its contractual obligation to deliver the currency by purchasing an offsetting contract with the same currency trader obligating it to purchase on the same maturity date the same amount of the currency.

It is impossible to forecast with absolute precision the market value of portfolio securities at the expiration of a forward contract. Accordingly, it may be necessary for a Fund to purchase additional currency on the spot market (and bear the expense of such purchase) if the market value of the security is less than the amount of currency the Fund is obligated to deliver and if a decision is made to sell the security and make delivery of the currency. Conversely, it may be necessary to sell on the spot market some of the currency received upon the sale of the portfolio security if its market value exceeds the amount of currency a Fund is obligated to deliver.

If a Fund retains the portfolio security and engages in an offsetting transaction, the Fund will incur a gain or a loss to the extent that there has been movement in forward contract prices. If a Fund engages in an offsetting transaction, it may subsequently enter into a new forward contract to sell the currency. Should forward prices decline during the period between the Fund’s entering into a forward contract for the sale of a currency and the date it enters into an offsetting contract for the purchase of the currency, the Fund will realize a gain to the extent the price of the currency it has agreed to sell exceeds the price of the currency it has agreed to purchase. Should forward prices increase, the Fund will suffer a loss to the extent the price of the currency it has agreed to purchase exceeds the price of the currency it has agreed to sell. A default on the contract would deprive the Fund of unrealized profits or force the Fund to cover its commitments for purchase or sale of currency, if any, at the current market price.

Hedging against a decline in the value of a currency does not eliminate fluctuations in the prices of portfolio securities or prevent losses if the prices of such securities decline. Such transactions also preclude the opportunity for gain if the value of the hedged currency should rise. Moreover, it may not be possible for a Fund to hedge against a devaluation that is so generally anticipated that the Fund is not able to contract to sell the currency at a price above the devaluation level it anticipates. The cost to a Fund of engaging in currency exchange transactions varies with such factors as the currency involved, the length of the contract period and prevailing market conditions. Since currency exchange transactions are usually conducted on a principal basis, no fees or commissions are involved.

Synthetic Foreign Money Market Positions. A Fund may invest in money market instruments denominated in foreign currencies. In addition to, or in lieu of, such direct investment, a Fund may construct a synthetic foreign money market position by (a) purchasing a money market instrument denominated in one currency, generally U.S. dollars, and (b) concurrently entering into a forward contract to deliver a corresponding amount of that currency in exchange for a different currency on a future date and at a specified rate of exchange. For example, a synthetic money market position in Japanese yen could be constructed by purchasing a U.S. dollar money market instrument, and entering concurrently into a forward contract to deliver a corresponding amount of U.S. dollars in exchange for Japanese yen on a specified date and at a specified rate of exchange. Because of the availability of a variety of highly liquid short-term U.S. dollar money market instruments, a synthetic money market position utilizing such U.S. dollar instruments may offer greater liquidity than direct investment in foreign currency money market instruments. The result of a direct investment in a foreign currency and a concurrent construction of a synthetic position in such foreign currency, in terms of both income yield and gain or loss from changes in currency exchange rates, should, in general, be similar, but would not be identical because the components of the alternative investments would not be identical.

Except to the extent a synthetic foreign money market position consists of a money market instrument denominated in a foreign currency, a synthetic foreign money market position shall not be deemed a “foreign security” for purposes of the policy that, under normal market conditions, the Driehaus Emerging Markets Growth Fund will invest at least 80% of its net assets (plus the amount of borrowings for investment purposes) in emerging markets companies, for the purposes of the policy that, under normal market conditions, the Driehaus Emerging Markets Small Cap Growth Fund will invest at least 80% of its net assets (plus the amount of borrowings for investment purposes) in small capitalization emerging markets companies or for the purposes of the policy that, under normal market conditions, the Driehaus Frontier Emerging Markets Fund will invest at least 80% of its net assets (plus the amount of borrowings for investment purposes) in frontier emerging markets companies, for the purposes of the policy that, under normal market conditions and the Driehaus International Small Cap Growth Fund will invest at least 80% of its net assets (plus the amount of borrowings for investment purposes) in non-U.S. small capitalization companies.

Securities markets in frontier emerging market countries are undergoing a period of growth and change which may result in trading volatility and difficulties in the settlement and recording of transactions, and in interpreting and applying the relevant law and regulations. The securities industries in these countries are comparatively undeveloped. Securities brokers and other intermediaries in frontier emerging market countries may not perform as well as their counterparts in the United States and other more developed securities markets.

Frontier emerging market countries may have relatively unstable governments and economies based on only a few industries. The value of Driehaus Frontier Emerging Markets Fund shares will likely be particularly sensitive to changes in the economies of such countries (such as reversals of economic liberalization, political unrest or changes in trading status). Additionally, changes in governments and

economies of such countries may result in capital controls or other regulatory measures that may affect the Fund’s ability to satisfy redemptions.

Subject to restriction (3) under “Investment Restrictions” in this SAI, each Fund may lend its portfolio securities to broker-dealers and banks. Any such loan must be continuously secured by collateral in cash or cash equivalents maintained on a current basis in an amount at least equal to the market value of the securities loaned by that Fund. Each Fund would continue to receive the equivalent of the interest or dividends paid by the issuer on the securities loaned, and would also receive an additional return that may be in the form of a fixed fee or a percentage of the collateral. Each Fund would have the right to call the loan and obtain the securities loaned at any time on notice of not more than five business days. Each Fund would not have the right to vote the securities during the existence of the loan, but would call the loan to permit voting of the securities if, in the Adviser’s judgment, a material event requiring a shareholder vote would otherwise occur before the loan was repaid. In the event of bankruptcy or other default of the borrower, each Fund could experience both delays in liquidating the loan collateral or recovering the loaned securities and losses, including (a) possible decline in the value of the collateral or in the value of the securities loaned during the period while each Fund seeks to enforce its rights thereto, (b) possible subnormal levels of income and lack of access to income during this period, and (c) expenses of enforcing its rights.

Each Fund may invest in repurchase agreements, provided that it will not invest more than 15% of net assets in repurchase agreements maturing in more than seven days as well as any other illiquid securities. A repurchase agreement is a sale of securities to the Fund(s) in which the seller agrees to repurchase the securities at a higher price, which includes an amount representing interest on the purchase price within a specified time. In the event of bankruptcy of the seller, the Fund(s) could experience both losses and delays in liquidating its collateral.

The Funds may purchase warrants, which are instruments that give holders the right, but not the obligation, to buy shares of a company at a given price during a specified period. Warrants are generally sold by companies intending to issue stock in the future, or by those seeking to raise cash by selling shares held in reserve.

Each Fund may make short sales “against the box.” In a short sale, a Fund sells a borrowed security and is required to return the identical security to the lender. A short sale “against the box” involves the sale of a security with respect to which the Fund already owns an equivalent security in kind and amount. A short sale “against the box” enables each Fund to obtain the current market price of a security that it desires to sell but is unavailable for settlement.

The Driehaus Emerging Markets Small Cap Growth Fund and the Driehaus Frontier Emerging Markets Fund may make short sales of securities to hedge its portfolio or a portion thereof or may do so speculatively for purposes of profiting from a decline in the market value of a security. A short sale is a transaction in which a fund sells a security it does not own in anticipation that the market price of that security will decline.

When the Driehaus Emerging Markets Small Cap Growth Fund and the Driehaus Frontier Emerging Markets Fund make a short sale, it will often borrow the security sold short and deliver it to the broker-dealer through which it made the short sale as collateral for its obligation to deliver the security upon

conclusion of the sale. In connection with short sales of securities, the Driehaus Emerging Markets Small Cap Growth Fund and the Driehaus Frontier Emerging Markets Fund may pay a fee to borrow securities or maintain an arrangement with a broker to borrow securities, and is often obligated to pay any dividends on such borrowed securities.

If the price of the security sold short increases between the time of the short sale and the time that the Driehaus Emerging Markets Small Cap Growth Fund and the Driehaus Frontier Emerging Markets Fund replaces the borrowed security, the Funds will incur a loss; conversely, if the price declines, the Funds will realize a capital gain. Any gain will be decreased, and any loss increased, by the transaction costs described above. The successful use of short selling may be adversely affected by imperfect correlation between movements in the price of the security sold short and the securities being hedged. In addition, unlike taking a long position in a security, where potential losses are limited to the purchase price, short sales have no cap on maximum losses.

To the extent that the Driehaus Emerging Markets Small Cap Growth Fund and the Driehaus Frontier Emerging Markets Fund engages in short sales, it will provide collateral to the broker-dealer and (except in the case of short sales “against the box”) will maintain additional asset coverage in the form of segregated or “earmarked” assets that the Adviser determines to be liquid in accordance with procedures established by the Board of Trustees and that is equal to the current market value of the securities sold short, or will ensure that such positions are covered by “offsetting” positions, until the Fund replaces the borrowed security. The Driehaus Emerging Markets Small Cap Growth Fund and the Driehaus Frontier Emerging Markets Fund will engage in short selling to the extent permitted by the federal securities laws and rules and interpretations thereunder. The Driehaus Emerging Markets Small Cap Growth Fund and the Driehaus Frontier Emerging Markets Fund may engage in short selling in foreign (non-U.S.) jurisdictions if permitted by the laws and regulations of such jurisdictions.

The Funds may purchase securities that have been privately placed but are eligible for purchase and sale under Rule 144A under the Securities Act of 1933, as amended (the “1933 Act”). Rule 144A permits certain qualified institutional buyers, such as the Funds, to trade in privately placed securities that have not been registered for sale under the 1933 Act. The Adviser, under the supervision of the Board, will consider whether securities purchased under Rule 144A are illiquid and thus subject to each Fund’s restriction of investing no more than 15% of its net assets in illiquid securities. In determining whether a Rule 144A security is liquid or not, the Adviser will consider the trading markets for the specific security, taking into account the unregistered nature of a Rule 144A security. In addition, the Adviser will consider the (1) frequency of trades and quotes, (2) number of dealers and potential purchasers, (3) dealer undertakings to make a market, and (4) nature of the security and of marketplace trades (e.g., the time needed to dispose of the security, the method of soliciting offers, and the mechanics of transfer). The liquidity of Rule 144A securities will be monitored. Investing in Rule 144A securities could have the effect of increasing the amount of a Fund’s assets invested in illiquid securities if qualified institutional buyers are unwilling to purchase such securities.

Subject to restriction (4) under “Investment Restrictions” in this SAI, the Trust has established a line of credit with a major bank in order to permit borrowing on a temporary basis to meet share redemption requests in circumstances in which temporary borrowing may be preferable to liquidation of portfolio securities. Currently the line of credit is available to each Fund.

Portfolio turnover rate is commonly measured by dividing the lesser of total purchases or sales for the period under consideration by the average portfolio value (i.e., the cumulative total investment in the

account at the end of each month, divided by the number of months under consideration).

There may be less governmental intervention in the securities markets in the near future. If so, it could cause an increase in interest rates, which would have a negative impact on fixed income securities and could negatively affect a Fund’s net asset value.

The U.S. government and foreign governments are in the process of adopting and implementing regulations governing derivatives markets, including mandatory clearing or certain derivatives, margin and reporting requirements. The ultimate impact of the regulations remains unclear. Additional regulation of derivatives may make derivatives more costly, limit their availability or utility, otherwise adversely affect their performance or disrupt markets. In addition, the SEC has proposed a new rule that would change the regulation of the use of derivatives by registered investment companies, such as the Funds. If the proposed rule takes effect, it could limit the ability of the funds to invest in derivatives.

Consistent with its objective, each Fund may invest in a broad array of financial instruments and securities, commonly known as derivatives. (For these purposes, forward currency contracts are not considered “derivatives.”) The Funds may enter into conventional exchange-traded and non exchange-traded options, futures contracts, futures options, swaps and similar transactions, such as caps, floors and collars, involving or relating to currencies, securities, interest rates, prices or other items. In each case, the value of the instrument or security is “derived” from the performance of an underlying asset or a “benchmark,” such as a security, an index, an interest rate or a currency.

Derivatives are most often used to manage investment risk or to create an investment position indirectly because they are more efficient or less costly than direct investment that cannot be readily established directly due to portfolio size, cash availability or other factors. They also may be used in an effort to enhance portfolio returns.

The successful use of derivatives may depend on the Adviser’s ability to correctly forecast changes in the levels and directions of movements in currency exchange rates, security prices, interest rates and other market factors affecting the derivative itself or the value of the underlying asset or benchmark. If the Adviser incorrectly forecasts such factors and has taken positions in derivative instruments contrary to prevailing market trends, the Funds could be exposed to the risk of loss. No assurance can be given that any strategy used will succeed. In addition, correlations in the performance of an underlying asset to a derivative may not be well established. Privately negotiated and over-the-counter derivatives may not be as well regulated and may be less marketable than exchange-traded derivatives.

The Funds may use equity linked certificates/notes/swaps (all derivatives) to further their investment objectives. In buying such derivatives, the Funds could be purchasing bank debt instruments, swaps or certificates that vary in value based on the value of the underlying benchmark security. If a Fund buys such derivative instruments, it is subject to the risk of the inability or refusal to perform of the counterparties to the transaction.

A swap transaction is an individually negotiated, nonstandardized agreement between two parties to exchange cash flows (and sometimes principal amounts) measured by different interest rates, exchange rates, indices or prices, with payments generally calculated by reference to a principal (“notional”) amount or quantity. In general, swaps are agreements pursuant to which a Fund contracts with a bank or a broker/dealer to receive a return based on or indexed to the performance of an individual security or a basket of securities. A Fund usually will enter into swaps on a net basis, i.e., the two payment streams are netted out in a cash settlement on the payment date or dates specified in the instrument, with the Fund receiving or paying, as the case may be, only the net amount of the two payments. The Adviser and the Funds believe such obligations do not constitute senior securities under the 1940 Act, and, accordingly,

will not treat them as being subject to the Funds’ borrowing restrictions. Swap contracts are not traded on exchanges; rather, banks and dealers act as principals in these markets. As a result, a Fund will be subject to the risk of the inability or refusal to perform with respect to such contracts on the part of the counterparties with which the Fund trades. If there is a default by a counterparty, a Fund may have contractual remedies pursuant to the agreements related to the transaction. The swap market is generally not regulated by any government authority. Participants in the swap markets are not required to make continuous markets in the swap contracts they trade.

As a result of the Dodd-Frank Act, certain swap agreements may be cleared through a clearinghouse and traded on an exchange or swap execution facility. New regulations could, among other things, increase the costs of such transactions, affect the ability of a Fund to enter into swap agreements or limit the ability of a Fund to terminate existing swap agreements or to realize amounts to be received under such agreements. The Adviser will continue to monitor developments in this area, particularly to the extent regulatory changes affect a Fund’s ability to enter into swap agreements.

To the extent the Funds use interest rate, currency and index swaps, they intend to use them as hedges and not as speculative investments and will not sell interest rate caps or floors where it does not own securities or other instruments providing the income stream a Fund may be obligated to pay. Interest rate swaps involve the exchange by a Fund with another party of their respective commitments to pay or receive interest, e.g., an exchange of floating rate payments for fixed rate payments with respect to a notional amount of principal. A currency swap is an agreement to exchange cash flows on a notional amount of two or more currencies based on the relative value differential among them. An index swap is an agreement to swap cash flows on a notional amount based on changes in the values of the reference indices. The purchase of a cap entitles the purchaser to receive payments on a notional principal amount from the party selling such cap to the extent that a specified index exceeds a predetermined interest rate or amount. The purchase of a floor entitles the purchaser to receive payments on a notional principal amount from the party selling such floor to the extent that a specified index falls below a predetermined interest rate or amount. A collar is a combination of a cap and a floor that preserves a certain return within a predetermined range of interest rates or values.

With respect to swaps, a Fund will accrue the net amount of the excess, if any, of its obligations over its entitlements with respect to each swap on a daily basis and will earmark or segregate an amount of cash or liquid securities having a value equal to the accrued excess. Caps, floors and collars require segregation of assets with a value equal to the Fund’s net obligation, if any.

Options on Securities and Indexes. The Funds may purchase and sell put options and call options on securities, indexes or foreign currencies. The Funds may purchase agreements, sometimes called cash puts, that may accompany the purchase of a new issue of bonds from a dealer.

An option on a security (or index) is a contract that gives the purchaser (holder) of the option, in return for a premium, the right to buy from (call) or sell to (put) the seller (writer) of the option the security underlying the option (or the cash value of the index) at a specified exercise price at any time during the term of the option (normally not exceeding nine months). The writer of an option on an individual security or on a foreign currency has the obligation upon exercise of the option to deliver the underlying security or foreign currency upon payment of the exercise price or to pay the exercise price upon delivery of the underlying security or foreign currency. Upon exercise, the writer of an option on an index is obligated to pay the difference between the cash value of the index and the exercise price multiplied by the specified multiplier for the index option. (An index is designed to reflect specified facets of a particular financial or securities market, a specific group of financial instruments or securities, or certain economic indicators.)

A Fund will write call options and put options only if they are “covered.” For example, in the case of a call option on a security, the option is “covered” if the Fund owns the security underlying the call or has

an absolute and immediate right to acquire that security without additional cash consideration (or, if additional cash consideration is required, cash or cash equivalents in such amount are earmarked or held in a segregated account by its custodian) upon conversion or exchange of other securities held in its portfolio.

If an option written by a Fund expires, the Fund realizes a capital gain equal to the premium received at the time the option was written. If an option purchased by a Fund expires, the Fund realizes a capital loss equal to the premium paid.

Prior to the earlier of exercise or expiration, an option may be closed out by an offsetting purchase or sale of an option of the same series (type, exchange, underlying security or index, exercise price, and expiration). There can be no assurance, however, that a closing purchase or sale transaction can be effected when a Fund desires.

A Fund will realize a capital gain from a closing purchase transaction if the cost of the closing option is less than the premium received from writing the option, or, if it is more, a Fund will realize a capital loss. If the premium received from a closing sale transaction is more than the premium paid to purchase the option, a Fund will realize a capital gain, or, if it is less, a Fund will realize a capital loss. The principal factors affecting the market value of a put or a call option include supply and demand, interest rates, the current market price of the underlying security or index in relation to the exercise price of the option, the volatility of the underlying security or index and the time remaining until the expiration date.

A put or call option purchased by a Fund is an asset of the Fund, valued initially at the premium paid for the option. The premium received for an option written by a Fund is recorded as a deferred credit. The value of an option purchased or written is marked-to-market daily and is valued at the closing price on the exchange on which it is traded or, if not traded on an exchange or no closing price is available, at the mean between the last bid and asked prices.

There are several risks associated with transactions in options. For example, there are significant differences between the securities markets, the currency markets, and the options markets that could result in an imperfect correlation between these markets, causing a given transaction not to achieve its objectives. A decision as to whether, when and how to use options involves the exercise of skill and judgment, and even a well-conceived transaction may be unsuccessful to some degree because of market behavior or unexpected events.

There can be no assurance that a liquid market will exist when a Fund seeks to close out an option position. If a Fund were unable to close out an option that it had purchased on a security, it would have to exercise the option in order to realize any profit or the option would expire and become worthless. If a Fund were unable to close out a covered call option that it had written on a security, it would not be able to sell the underlying security until the option expired. As the writer of a covered call option on a security, a Fund foregoes, during the option’s life, the opportunity to profit from increases in the market value of the security covering the call option above the sum of the premium and the exercise price of the call.

If trading were suspended in an option purchased or written by a Fund, the Fund would not be able to close out the option. If restrictions on exercise were imposed, a Fund might be unable to exercise an option it has purchased.

Futures Contracts and Options on Futures Contracts. The Funds may use interest rate futures contracts, index futures contracts, and foreign currency futures contracts. An interest rate, index or foreign currency futures contract provides for the future sale by one party and purchase by another party of a specified quantity of a financial instrument or the cash value of an index¹ at a specified price and time. A public

market exists in futures contracts covering a number of indexes (including, but not limited to, the Standard & Poor’s 500^® Index, the Value Line Composite Index, and the New York Stock Exchange Composite Index), as well as financial instruments (including, but not limited to, U.S. Treasury bonds, U.S. Treasury notes, Eurodollar certificates of deposit, and foreign currencies). Other index and financial instrument futures contracts are available and it is expected that additional futures contracts will be developed and traded.

The Funds may purchase and write call and put futures options. Futures options possess many of the same characteristics as options on securities, indexes and foreign currencies (discussed above). A futures option gives the holder the right, in return for the premium paid, to assume a long position (call) or short position (put) in a futures contract at a specified exercise price at any time during the period of the option. Upon exercise of a call option, the holder acquires a long position in the futures contract and the writer is assigned the opposite short position. In the case of a put option, the opposite is true. A Fund might, for example, use futures contracts to hedge against or gain exposure to fluctuations in the general level of stock prices, anticipated changes in interest rates or currency fluctuations that might adversely affect either the value of a Fund’s securities or the price of the securities that a Fund intends to purchase. Although other techniques could be used to reduce or increase a Fund’s exposure to stock price, interest rate and currency fluctuations, a Fund may be able to achieve its exposure more effectively and perhaps at a lower cost by using futures contracts and futures options.

The success of any futures transaction may depend on the Adviser correctly predicting changes in the level and direction of stock prices, interest rates, currency exchange rates and other factors. Should those predictions be incorrect, a Fund’s return might have been better had the transaction not been attempted; however, in the absence of the ability to use futures contracts, the Adviser might have taken portfolio actions in anticipation of the same market movements with similar investment results but, presumably, at greater transaction costs.

When a purchase or sale of a futures contract is made by a Fund, the Fund is required to deposit with its custodian (or broker, if legally permitted) a specified amount of cash or U.S. government securities or other securities acceptable to the broker (“initial margin”). The margin required for a futures contract is set by the exchange on which the contract is traded and may be modified during the term of the contract. The initial margin is in the nature of a performance bond or good faith deposit on the futures contract, which is returned to a Fund upon termination of the contract, assuming all contractual obligations have been satisfied. The Funds expect to earn interest income on their initial margin deposits. A futures contract held by a Fund is valued daily at the official settlement price of the exchange on which it is traded. Each day a Fund pays or receives cash, called “variation margin,” equal to the daily change in value of the futures contract. This process is known as “marking-to-market.” Variation margin paid or received by a Fund does not represent a borrowing or loan by the Fund but is instead settlement between the Fund and the broker of the amount one would owe the other if the futures contract had expired at the close of the previous day. In computing daily net asset value, each Fund will mark-to-market its open futures positions.

Each Fund is also required to deposit and maintain margin with respect to put and call options on futures contracts written by it. Such margin deposits will vary depending on the nature of the underlying futures contract (and the related initial margin requirements), the current market value of the option and other futures positions held by the Fund.

Although some futures contracts call for making or taking delivery of the underlying securities, usually these obligations are closed out prior to delivery by offsetting purchases or sales of matching futures contracts (same exchange, underlying security or index and delivery month). If an offsetting purchase price is less than the original sale price, a Fund realizes a

capital gain, or if it is more, a Fund realizes a capital loss. Conversely, if an offsetting sale price is more than the original purchase price, a Fund realizes a capital gain, or if it is less, a Fund realizes a capital loss. The transaction costs must also be included in these calculations.

There are several risks associated with the use of futures contracts and futures options. A purchase or sale of a futures contract may result in losses in excess of the amount invested in the futures contract. In trying to increase or reduce market exposure, there can be no guarantee that there will be a correlation between price movements in the futures contract and in the portfolio exposure sought. In addition, there are significant differences between the securities and futures markets that could result in an imperfect correlation between the markets, causing a given transaction not to achieve its objectives. The degree of imperfection of correlation depends on circumstances such as variations in speculative market demand for futures, futures options and the related securities, including technical influences in futures and futures options trading and differences between the securities markets and the securities underlying the standard contracts available for trading. For example, in the case of index futures contracts, the composition of the index, including the issuers and the weighting of each issue, may differ from the composition of a Fund’s portfolio, and, in the case of interest rate futures contracts, the interest rate levels, maturities and creditworthiness of the issues underlying the futures contract may differ from the financial instruments held in a Fund’s portfolio. A decision as to whether, when and how to use futures contracts involves the exercise of skill and judgment, and even a well-conceived transaction may be unsuccessful to some degree because of market behavior or unexpected stock price or interest rate trends.

Futures exchanges may limit the amount of fluctuation permitted in certain futures contract prices during a single trading day. The daily limit establishes the maximum amount that the price of a futures contract may vary either up or down from the previous day’s settlement price at the end of the current trading session. Once the daily limit has been reached in a futures contract subject to the limit, no more trades may be made on that day at a price beyond that limit. The daily limit governs only price movements during a particular trading day and therefore does not limit potential losses because the limit may work to prevent the liquidation of unfavorable positions. For example, futures prices have occasionally moved to the daily limit for several consecutive trading days with little or no trading, thereby preventing prompt liquidation of positions and subjecting some holders of futures contracts to substantial losses. Stock index futures contracts are not normally subject to such daily price change limitations.

There can be no assurance that a liquid market will exist at a time when a Fund seeks to close out a futures or futures option position. The Fund would be exposed to possible loss on the position during the interval of inability to close and would continue to be required to meet margin requirements until the position is closed. In addition, many of the contracts discussed above are relatively new instruments without a significant trading history. As a result, there can be no assurance that an active secondary market will develop or continue to exist.

Limitations on Options and Futures. If other options, futures contracts or futures options of types other than those described herein are traded in the future, a Fund may also use those investment vehicles, provided that the Board determines that their use is consistent with the Fund’s investment objective.

When purchasing a futures contract or writing a put option on a futures contract, a Fund must maintain with its custodian (or broker, if legally permitted) cash or cash equivalents (including any margin) equal to the market value of such contract. When writing a call option on a futures contract, a Fund similarly will maintain with its custodian cash or cash equivalents (including any margin) equal to the amount by which such option is in-the-money until the option expires or is closed out by the Fund.

A Fund may not maintain open short positions in futures contracts, call options written on futures contracts or call options written on indexes if, in the aggregate, the market value of all such open positions exceeds the current value of the securities in its portfolio, plus or minus unrealized gains and losses on the open positions, adjusted for the historical relative volatility of the relationship between the portfolio and the positions. For this purpose, to the extent a Fund has written call options on specific

securities in its portfolio, the value of those securities will be deducted from the current market value of the securities portfolio.

A notice of eligibility for exclusion from the definition of the term “commodity pool operator” has been filed with the National Futures Association with respect to each Fund. The Funds intend to limit their use of futures and options on futures or commodities or engage in swap transactions so as to remain eligible for the exclusion. If a Fund were no longer able to claim the exemption, the Adviser would be required to register as a “commodity pool operator,” and the Adviser and the Fund would be subject to regulation under the Commodity Exchange Act.

Participation Notes and Participatory Notes. The Driehaus Emerging Markets Growth Fund, Driehaus Frontier Emerging Markets Fund, Driehaus Emerging Markets Small Cap Growth Fund and Driehaus International Small Cap Growth Fund may invest in participation notes or participatory notes (“P-Notes”) in circumstances where the Fund cannot obtain direct access to a foreign stock market. P-Notes are participation interest notes that are issued by banks or broker-dealers and are designed to offer a return linked to a particular underlying equity, debt, currency or market. If the P-Note were held to maturity, the issuer would pay to, or receive from, the purchaser the difference between the nominal value of the underlying instrument at the time of purchase and that instrument’s value at maturity. The holder of a P-Note that is linked to a particular underlying security or instrument may be entitled to receive any dividends paid in connection with that underlying security or instrument, but typically does not receive voting rights as it would if it directly owned the underlying security or instrument. P-Notes involve transaction costs. Investments in P-Notes involve the same risks associated with a direct investment in the underlying securities, instruments or markets that they seek to replicate. In addition, there can be no assurance that there will be a trading market for a P-Note or that the trading price of a P-Note will equal the underlying value of the security, instrument or market that it seeks to replicate. Due to liquidity and transfer restrictions, the secondary markets on which a P-Note is traded may be less liquid than the market for other securities, or may be completely illiquid, which may also affect the ability of the Fund to accurately value a P-Note. P-Notes typically constitute general unsecured contractual obligations of the banks or broker-dealers that issue them, which subjects the Fund that holds them to counterparty risk and this risk may be amplified if the Fund purchases P-Notes from only a small number of issuers.

Participation in the options or futures markets involves investment risks and transactions costs to which the Driehaus Frontier Emerging Markets Fund and Driehaus Emerging Markets Small Cap Growth Fund would not be subject absent the use of these strategies. In particular, the loss from investing in futures contracts is potentially unlimited. If the Adviser’s prediction of movements in the securities and interest rate markets is inaccurate, the Fund could be in a worse position than if such strategies were not used.

Risks inherent in the use of options, futures contracts and options on futures contracts include: (1) imperfect correlation between the price of options and futures contracts and options thereon and movements in the prices of the securities being hedged; (2) the fact that skills needed to use these strategies are different from those needed to select portfolio securities; and (3) the possible absence of a liquid secondary market for any particular instrument at any time.

The Driehaus Emerging Markets Small Cap Growth Fund and Driehaus Frontier Emerging Markets Fund may invest in corporate debt securities issued by issuers in frontier emerging market countries. Corporate debt securities include corporate bonds, debentures, notes and other similar instruments, including certain convertible securities. Debt securities may be acquired with warrants attached. Corporate income

producing securities also may include forms of preferred or preference stock. The rate of interest on a corporate debt security may be fixed, floating or variable, and may vary inversely with respect to a reference rate such as interest rates or other financial indications. These Funds can invest in corporate securities of any rating or that are unrated. The rate of return or return of principal on some debt obligations may be linked or indexed to the level of exchange rates between the U.S. dollar and a foreign currency or currencies.

The Driehaus Emerging Markets Small Cap Growth Fund and Driehaus Frontier Emerging Markets Fund may invest in convertible debt securities. Each of these Funds may also invest in common or preferred stock as a means of realizing the economic value associated with owning convertible securities. Convertible securities are bonds or preferred stocks that may be converted (exchanged) into common stock of the issuing company within a certain period of time, for a specified number of shares. By investing in convertible debt securities, the Fund seeks the opportunity, through the conversion feature, to participate in the capital appreciation of the common stock into which the securities are convertible, while investing at a better price than may be available on the common stock or obtaining a higher fixed rate of return than is available on common stocks. The market value of convertible debt securities tends to vary inversely with the level of interest rates. Although under normal market conditions longer-term debt securities have greater yields than do shorter-term debt securities of similar quality, they are subject to greater price fluctuations.

The Driehaus Emerging Markets Small Cap Growth Fund and Driehaus Frontier Emerging Markets Fund may invest in sovereign debt securities, which are subject to various risks in addition to those relating to debt securities and foreign securities generally, including, but not limited to, the risk that a governmental entity may be unwilling or unable to pay interest and repay principal on its sovereign debt, or otherwise meet its obligations when due because of cash flow problems, insufficient foreign reserves, the relative size of the debt service burden to the economy as a whole, the government’s policy towards principal international lenders such as the International Monetary Fund, or the political considerations to which the government may be subject. If a sovereign debtor defaults (or threatens to default) on its sovereign debt obligations, the indebtedness may be restructured. Some sovereign debtors have in the past been able to restructure their debt payments without the approval of some or all debt holders or to declare moratoria on payments. In the event of a default on sovereign debt, the Fund may also have limited legal recourse against the defaulting government entity.

The Fund may enter into forward contracts, futures and options contracts and swap agreements to provide economic exposure similar to investments in sovereign frontier emerging market debt or for hedging purposes. Derivatives can be highly volatile, illiquid and difficult to value. Certain types of derivatives, including swap agreements, forward contracts and other over-the-counter transactions, involve greater risks than the underlying obligations because, in addition to general market risks, they are subject to illiquidity risk, counterparty risk, credit risk and pricing risk.

The Fund may hold short positions in sovereign debt instruments for purposes of hedging the Fund’s frontier emerging market securities. Short sales on sovereign debt are also subject to risks discussed under the heading “Short Sales.”

Each Fund may purchase shares of exchange-traded funds (“ETFs”). All ETFs are investment companies whose shares are bought and sold on a securities exchange. An ETF generally represents a portfolio of securities designed to track a particular market index. The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the index is designed to track, although lack of liquidity in a particular ETF could result in it being more volatile than the underlying portfolio of securities and trading at a discount to its net asset value. ETFs also have management fees that are part of their costs, and the Fund will indirectly bear its proportionate share of these costs.

Each Fund’s investment in ETFs, subject to the exception specified in the next sentence, currently is limited to (a) 3% of the total voting stock of any one ETF, (b) 5% of the Fund’s total assets with respect to any one ETF and (c) 10% of the Fund’s total assets in the aggregate. An exception to these limitations is found in Section 12(d)(1)(F) of the 1940 Act, which provides that the above limitations do not apply to securities purchased or otherwise acquired by the Fund if (a) immediately after such purchase or acquisition not more than 3% of the total outstanding securities of such ETF is owned by the Fund and all affiliated persons of the Fund; and (b) the Fund has not offered or sold, and is not proposing to offer or sell, any security issued by it through a principal underwriter or otherwise at a public or offering price which includes a sales load of more than 1 1/2%. In any event, the Fund will not invest more than 10% of its total assets in ETFs.

Each Fund operates under the following fundamental investment restrictions, which, together with the investment objective and fundamental policies, cannot be changed without the approval of a “majority of the outstanding voting securities,” which is defined in the 1940 Act to mean the lesser of (i) 67% of a Fund’s shares present at a meeting where more than 50% of the outstanding shares are present in person or by proxy or (2) more than 50% of a Fund’s outstanding shares. Each Fund may not:

The Driehaus Frontier Emerging Markets Fund may not invest in a security if 25% or more of its total assets (taken at market value at the time of a particular purchase) would be invested in the securities of issuers in any particular industry, except that the Fund may invest up to 35% of its total assets (taken at market value at the time of a particular purchase) in the securities of issuers in any one industry if, at the time of purchase, that industry² represents 20% or more of the Fund’s primary benchmark index. This restriction does not apply to securities issued or guaranteed by the U.S. government or its agencies or instrumentalities.

All swap agreements and other derivative instruments that were not classified as commodities or commodity contracts prior to July 21, 2010 are not deemed to be commodities or commodity contracts for purposes of restriction number 2 above. The deposit or payment by a Fund of initial, maintenance or variation margin in connection with all types of short sales, options and futures contact transactions is not considered to be borrowing for purposes of restriction number 4 above or the issuance of a senior security for purposes of restriction number 6 above.

Each Fund is also subject to the following nonfundamental restrictions and policies, which may be changed by the Board without shareholder approval. Each Fund may not:

Each applicable Fund will notify its shareholders at least 60 days prior to any change in the policies described in (6), (7), (8), (9) and (10) above.

For purposes of these investment restrictions, with the exception of the restriction on borrowing, subsequent changes in a Fund’s holdings as a result of changing market conditions or changes in the amount of the Fund’s total assets does not require a Fund to sell or dispose of an investment or to take any other action, except that if illiquid securities exceed 15% of a Fund’s net assets after the time of purchase, the Fund will take steps to reduce in an orderly fashion its holdings of illiquid securities. Because illiquid securities may not be readily marketable, the portfolio managers may not be able to dispose of them in a timely manner. As a result, a Fund may be forced to hold illiquid securities while their price depreciates. Depreciation in the price of illiquid securities may cause the net asset value of a Fund to decline. With respect to the investment restriction related to borrowing, a Fund may only borrow from banks and in the event that such asset coverage shall at any time fall below 33 1/3% of its total assets, the Fund shall, within three days thereafter (not including Sundays and holidays), reduce the amount of its borrowings to an extent that the asset coverage of such borrowings shall be at least 33 1/3% of its total assets.

It is the policy of the Funds, DCM and Driehaus Securities LLC (“DS LLC” or the “Distributor”) that non-public information about the Funds’ portfolio holdings (“Portfolio Holdings”) may not be selectively disclosed to any person, unless the disclosure (a) is made for a legitimate business purpose, (b) is made to a recipient who is subject to a duty to keep the information confidential, including a duty not to trade on the basis of the Funds’ Portfolio Holdings (“Authorized Recipients”), (c) is consistent with DCM’s fiduciary duties as an investment adviser, the duties owed by DS LLC as a broker-dealer or the duties owed by the Funds to their shareholders and (d) will not violate the antifraud provisions of the federal securities laws (“Disclosure Conditions”). The purpose of this policy is to prevent abusive trading in shares of the Funds, such as market timing, and not other fraudulent practices, e.g., trading on “inside information,” that are addressed in the Trust’s, DCM’s and DS LLC’s Code of Ethics.

and transfer agent; DCM’s proxy-voting service; the Funds’ pricing service; and “best execution” analysts retained to evaluate the quality of executions obtained for the Funds, provided their contracts with the Funds, DCM and DS LLC contain appropriate provisions protecting the confidentiality, and limiting the use, of the information; (h) consultants and rating and ranking organizations that have entered into written confidentiality agreements with the Trust, DCM or DS LLC appropriately limiting their use of the information; and (i) such other Authorized Recipients as may be pre-approved from time to time by DCM’s Chief Executive Officer, President or General Counsel.

Authorized Recipients do not include, for example, members of the press or other communications media, institutional investors and persons that are engaged in selling shares of the Funds to customers, such as financial planners, broker-dealers or other intermediaries unless the Disclosure Conditions are satisfied. However, the Funds, DCM or DS LLC may make disclosure of a limited number of Portfolio Holdings, provided the Funds are not disadvantaged by such disclosure and the disclosure is made for a legitimate business purpose. For example, in the normal course of business, in discussions about the Funds with current and prospective institutional shareholders and/or their advisors conducting due diligence about the Funds, the Adviser may occasionally and incidentally mention specific Portfolio Holdings that have not been previously disclosed. The Funds and the Adviser do not believe that these disclosures will disadvantage the Funds.

The Funds will post performance figures on their web site within seven business days after month-end. The Funds will post Portfolio Holdings, including top five holdings, on their web site 30 days after month-end. Sector and country weightings and performance attribution will be posted as soon as information is available after calendar quarter-end. All Portfolio Holdings information is available at www.driehaus.com. Portfolio Holdings information is also available upon request after the web site posting and quarterly on Form N-Q or Form N-CSR. These filings are described below.

The Funds’ Portfolio Holdings posted on the web site and in these filings may not represent current or future portfolio composition and are subject to change without notice. Information on particular Portfolio Holdings may be withheld if it is in a Fund’s best interest to do so.

DCM and DS LLC shall not agree to give or receive from any person or entity any compensation or consideration of any kind (including an agreement to maintain assets in any portfolio or enter into or maintain any other relationship with DCM or DS LLC) in connection with the release of a Fund’s Portfolio Holdings.

DCM’s General Counsel is responsible for reviewing the agreements between the Trust, DCM or DS LLC and the third-party service providers, consultants, rating and ranking organizations and any pre-approved Authorized Recipients, to seek to ensure that these agreements contain appropriate confidentiality and limitations on use provisions. DCM’s Chief Compliance Officer is responsible for monitoring compliance with the Funds’ pre-approval and disclosure restrictions. The Trust’s Treasurer, Chief Legal Officer and Chief Compliance Officer, working with the Trust’s counsel, are responsible for ensuring the accuracy and completeness of the Prospectus and SAI disclosure related to the Funds’ disclosure of portfolio holdings. The Trust’s Chief Compliance Officer will report to the Trust’s Board at least annually on compliance by the Funds, DCM and DS LLC with the policies and procedures on selective disclosure of the Funds’ Portfolio Holdings to enable the Board to exercise its oversight of these policies and procedures.

The Funds’ Portfolio Holdings must be filed with the SEC within 60 days of quarter-end. The Portfolio Holdings are available on the Funds’ web site at www.driehaus.com within five business days after filing with the SEC and are available on the web site for at least six months from the posting date.

How to purchase and redeem Fund shares is discussed in the Prospectus. The Prospectus discloses that you may purchase (or redeem) shares through investment dealers or other institutions. It is the responsibility of any such institution to establish procedures insuring the prompt transmission to the Funds of any such purchase order.

Each Fund’s net asset value is determined on days on which the New York Stock Exchange (the “NYSE”) is open for trading. The NYSE is regularly closed on Saturdays and Sundays and on New Year’s Day, Dr. Martin Luther King, Jr. Day, Presidents’ Day, Good Friday, Memorial Day, Independence Day (observed), Labor Day, Thanksgiving Day and Christmas Day (observed). If one of these holidays falls on a Saturday or Sunday, the NYSE will be closed on the preceding Friday or the following Monday, respectively.

The Trust intends to pay all redemptions in cash and will pay cash for all redemption orders, limited in amount with respect to each shareholder of record during any ninety-day period to the lesser of $250,000 or one percent of the net assets of the relevant Fund, as measured at the beginning of such period. However, redemptions in excess of such limit may be paid wholly or partly by a distribution in kind of exchange-traded securities. If redemptions are made in kind, the proceeds are taxable for federal income tax purposes in the same manner as a redemption for cash and the redeeming shareholder might incur transaction costs in selling the securities received in the redemption.

The Trust reserves the right to suspend or postpone redemptions of shares of a Fund during any period when: (a) trading on the NYSE is restricted, as determined by the SEC, or the NYSE is closed for other than customary weekend and holiday closings; (b) the SEC has by order permitted such suspension; or (c) an emergency, as determined by the SEC, exists, making disposal of portfolio securities or valuation of net assets of a Fund not reasonably practicable.

The net asset value per share of a Fund is calculated by dividing (i) the value of the securities held by the Fund (i.e., the value of its investments), plus any cash or other assets, minus all liabilities (including accrued estimated expenses on an annual basis), by (ii) the total number of outstanding shares of the Fund. Investment securities, including ADRs, EDRs and GDRs, that are traded on a stock exchange are valued at the last sale price as of the regular close of business on the NYSE (normally 3:00 p.m. Central time) on the day the securities are being valued, or lacking any sales, at either (a) the last bid prices or (b) the mean between the closing bid and asked prices. Securities traded on Nasdaq will be valued at the Nasdaq official closing price or if there were no sales, at the mean between the closing bid and asked prices. Other over-the-counter securities are valued at the mean between the closing bid and asked prices. Net asset value will not be determined on days when the NYSE is closed, unless, in the judgment of the Board, the net asset value of a Fund should be determined on any such day, in which case the determination will be made at 3:00 p.m. Central time.

In the event that the NYSE or the relevant national securities exchange adopts different trading hours on a temporary basis, a Fund’s net asset value will be computed at the close of the exchange.

not take place contemporaneously with the determination of the prices of portfolio securities used in such calculation. Events affecting the values of portfolio securities that occur between the time their prices are determined and the close of the NYSE will not be reflected in the calculation of net asset value unless the Adviser, by or under the direction of the Board of Trustees, deems that the particular event would materially affect net asset value, in which case an adjustment will be made. Assets or liabilities initially expressed in terms of foreign currencies are translated prior to the next determination of the net asset value into U.S. dollars at the spot exchange rates at 3:00 p.m. Central time or at such other rates as the Adviser may determine to be appropriate in computing net asset value.

Securities and assets for which market quotations are not readily available are valued at fair value determined by the Adviser’s Pricing Committee pursuant to methodologies established in good faith by the Board. If the Adviser’s Pricing Committee determines that the foregoing methods do not accurately reflect current market value, securities and assets are valued at fair value as determined in good faith by or under direction of the Board. The Funds use an independent pricing service to provide fair value estimates for relevant foreign equity securities on days when the U.S. market movement exceeds a certain threshold. This pricing service uses correlations between the movement of prices of foreign equity securities and indexes of U.S. traded securities and other indicators, such as closing prices of ADRs and futures contracts, to determine the fair value of relevant foreign equity securities. Such valuations and procedures will be reviewed by the Board at its next regularly scheduled meeting.

The Funds use independent pricing services approved by the Board. Unless priced in accordance with the provisions of the prior paragraph, prices of equity securities provided by such services represent the last quoted sale price on the exchange where the security is primarily traded. Exchange rates of currencies provided by such services are sourced, where possible, from multi-contributor quotations. Normally, the rate will be based upon commercial interbank bid and offer quotes. Representative rates are selected for each currency based upon the latest quotation taken from contributors at short intervals prior to pricing. Prices of bonds by such services represent evaluations of the mean between current bid and asked market prices, may be determined without exclusive reliance on quoted prices and may reflect appropriate factors such as institution-size trading in similar groups of securities, yield, quality, coupon rate, maturity, type of issue, individual trading characteristics, indications of values from dealers and other market data. Such services may use electronic data processing techniques and/or a matrix system to determine valuations.

Long-term debt obligations held long are valued at the representative quoted bid prices for such securities. Long-term debt obligations sold short will be valued at the representative quoted asked price for such securities. When the Adviser deems it appropriate, prices obtained for the day of valuation from a bond pricing service will be used, as discussed below. Debt securities with maturities of 60 days or less are valued at amortized cost. Repurchase agreements are valued at cost plus accrued interest.

U.S. government securities are traded in the over-the-counter market and are valued at the last available bid price. Securities with a demand feature exercisable within one to seven days are valued at par. U.S. government securities that are sold short are valued at the last available asked price. Such valuations are based on quotations of one or more dealers that make markets in the securities as obtained from such dealers, or on the evaluation of a pricing service.

Options, futures contracts and options thereon, which are traded on exchanges, are valued at their last sale or settlement price as of the close of such exchanges or, if no sales are reported, at the mean between the last reported bid and asked prices. If an options or futures exchange closes later than 3:00 p.m. Central time, the options or futures traded on it are valued based on the sale price, or on the mean between the bid and ask prices, as the case may be, as of 3:00 p.m. Central time.

The officers of the Trust manage its day-to-day operations under the direction of the Trust’s Board. The primary responsibility of the Board is to represent the interests of the shareholders of each series of the Trust and to provide oversight of the management of the Trust. More than 75 percent of the Trust’s Board members are not affiliated with the Adviser or the Distributor. Each Trustee will serve as a Trustee until (i) termination of the Trust, or (ii) the Trustee’s retirement, resignation, or death, or (iii) as otherwise specified in the Trust’s governing documents. Officers of the Trust are elected by the Board on an annual basis. The following table sets forth certain information with respect to the Trustees of the Trust. The Trustees oversee each series of the Trust, which as of the date of this SAI consists of eight series, including the Funds.

The following table sets forth certain information with respect to the officers of the Trust.

collectively, the “Independent Trustees”) and one Interested Trustee. The Board has appointed an Independent Trustee to serve as Chairperson of the Board. Generally, the Board acts by majority vote of all of the Trustees, including a majority vote of the Independent Trustees if required by applicable law. The Trust’s day-to-day operations are managed by the Adviser and other service providers who have been approved by the Board. The Board meets periodically throughout the year to oversee the Trust’s activities, review contractual arrangements with service providers, oversee compliance with regulatory requirements, and review performance. The Board has determined that its leadership structure is appropriate given the size of the Board, the experience of each Trustee with the Trust and the number and nature of funds (including the Funds) within the Trust.

The Trustees were selected to serve and continue on the Board based upon their skills, experience, judgment, analytical ability, diligence, ability to work effectively with other Trustees and a commitment to the interests of shareholders and with respect to the Independent Trustees, a demonstrated willingness to take an independent and questioning view of management. Each Trustee currently also has familiarity with the Funds, the Adviser and the Distributor, and their operations, as well as the special regulatory requirements governing regulated investment companies and the special responsibilities of investment company directors as a result of his or her prior service as a Trustee of the Trust or as an Advisory Board Member. In addition to those qualifications, the following is a brief summary of the specific experience, qualifications or skills that led to the conclusion, as of the date of this SAI, that each person identified below should serve as a Trustee for the Trust. References to the qualifications, attributes and skills of the Trustees are pursuant to requirements of the SEC, and do not constitute a holding out of the Board or any Trustee as having any special expertise and shall not impose any greater responsibility or liability on any such person or on the Board by reason thereof. As required by rules the SEC has adopted under the 1940 Act, the Trust’s Independent Trustees select and nominate all candidates for Independent Trustee positions.

Richard H. Driehaus. Mr. Driehaus has served as Trustee of the Trust since 1996 and served as President of the Trust from 1996 to 2011. He is Chairman of the Board and founder of the Adviser, the Distributor and USVI. In addition to his business experience as a chief executive officer, Mr. Driehaus has managed investments for over 40 years and currently serves as Chief Investment Officer of the Adviser. He serves on the Boards of Driehaus Capital Holdings LLLP, Driehaus Enterprise Management, Inc., Driehaus Trust Company, LLC, The Richard H. Driehaus Foundation and The Richard H. Driehaus Museum. Mr. Driehaus’s role as Chief Investment Officer is structured to be compatible with the information barriers that apply to his investment and trading activity under the code of ethics adopted by the Adviser, the Distributor and the Trust. As the CIO, Mr. Driehaus sets the Adviser’s equity investment philosophy. However, he is prohibited on an on-going basis from engaging in stock-specific discussions with the investment personnel.

Daniel F. Zemanek. Mr. Zemanek has served as Trustee of the Trust since 1996 and Chairperson of the Board since June 2014. From 2008 through 2014, he served as President of Ludan, Inc., a real estate services company specializing in senior housing. Mr. Zemanek has held senior management positions with various real estate development companies, including serving as Senior Vice President of Sunrise Development, Inc., a wholly-owned subsidiary of Sunrise Senior Living, Inc., a NYSE company (SRZ), from 2003 to 2007. Mr. Zemanek has also served as a consultant for real estate development.

Council on Financial Capability for Young Americans, President’s Advisory Council on Financial Capability, Federal Deposit Insurance Corporation Advisory Committee on Economic Inclusion and Jump$tart Coalition for Personal Financial Literacy. Mr. Beck previously served on the Boards of Wilshire Variable Insurance Trust and Wilshire Mutual Funds.

Francis J. Harmon. Mr. Harmon has served as Trustee of the Trust since 1998. He has served as Relationship Manager of Great Lakes Advisors, Inc. since 2008. From 1989 to 2008, Mr. Harmon was a Principal Account Executive-Labor Affairs with Blue Cross and Blue Shield of Illinois and prior to 1989 was Director of Workers Compensation/Health and Welfare Benefits for the City of Chicago.

Christopher J. Towle. Mr. Towle has served as Trustee of the Trust since 2016. From 1987 to 2014, Mr. Towle was with Lord Abbett & Co., most recently as Partner, Portfolio Manager and Director of High Yield and Convertible Securities. He is a CFA charterholder.

Dawn M. Vroegop. Ms. Vroegop has served as Trustee of the Trust since 2012 and served as an Advisory Board member from 2011 to 2012. From 1999 to 2003, she was a Managing Director with Dresdner RCM Global Investors. She also serves on the Boards of Met Investor Series Trust, Metropolitan Series Fund, Inc. and City College of San Francisco Foundation. The Board of the Trust has determined that Ms. Vroegop is qualified as an “audit committee financial expert” as defined by the SEC.

Risk oversight forms part of the Board’s general oversight of the Funds and is addressed as part of various Board and Committee activities. As part of its regular oversight of the Funds, the Board, directly or through a Committee, interacts with and reviews reports from, among others, the Adviser, the Chief Compliance Officer and the independent registered public accounting firm, as appropriate, regarding risks faced by the Funds. The Board, with the assistance of the Adviser, reviews investment policies and risks in connection with its review of the Funds’ performance. The Board has appointed a Chief Compliance Officer who oversees the implementation and testing of the Funds’ compliance program and reports to the Board regarding compliance matters for the Funds and their service providers. In addition, as part of the Board’s oversight of the Funds’ advisory and other service provider agreements, the Board may periodically consider risk management aspects of their operations and the functions for which they are responsible. With respect to valuation, the Board has approved Pricing Procedures intended to address valuation issues.

The Board has established the following Committees and the membership of each Committee to assist in its oversight functions, including its oversight of the risks the Funds face. Committee membership is identified below. Each Committee must report its activities to the Board on a regular basis.

The primary purpose of the Committee is to assist the Board in fulfilling certain of its responsibilities. The Audit Committee serves as an independent and objective party to monitor the Funds’ accounting policies, financial reporting and internal control system, as well as the work of the independent registered public accounting firm. The Audit Committee assists Board oversight of (1) the quality and integrity of the Funds’ financial statements and the independent audit thereof; (2) the Funds’ accounting and financial reporting processes and internal control over financial reporting; (iii) the Funds’ compliance with legal and regulatory requirements that relate to the Funds’ accounting and financial reporting, internal control over financial reporting and independent audits; and (iv) the qualifications, independence and performance of the Funds’ independent registered public accounting firm. The Audit Committee also serves to provide an open avenue of communication among the independent registered public accounting

firm, Fund management and the Board. All Independent Trustees serve as members of the Audit Committee. The Audit Committee held two meetings during the Trust’s last fiscal year.

The Committee’s primary purpose is to exercise certain powers of the Board when the Board is not in session. When the Board is not in session, the Committee may exercise all powers of the Board subject to certain statutory exceptions. The members of the Executive Committee are Richard H. Driehaus and Daniel F. Zemanek. The Executive Committee held no meetings during the Trust’s last fiscal year.

The Committee’s primary purpose is (1) to identify and recommend individuals for membership on the Board and (2) to oversee the administration of the Board Governance Guidelines and Procedures. The Committee’s responsibilities include evaluating Board membership and functions, committee membership and functions, insurance coverage, and legal and compliance matters. All Independent Trustees serve as members of the Nominating and Governance Committee. The Nominating and Governance Committee held four meetings during the Trust’s last fiscal year.

The nominating functions of the Nominating and Governance Committee include selecting and nominating all candidates who are not “interested persons” of the Trust (as defined in the 1940 Act) for election to the Board. Suggestions for candidates may be submitted to the Committee by other Trustees, by shareholders or by the Adviser. Shareholders may submit suggestions for candidates by sending a resume of the candidate to the Secretary of the Trust for the attention of the Chairperson of the Nominating and Governance Committee to 25 East Erie Street, Chicago, Illinois 60611. With regard to candidates for interested Trustee positions, the Nominating and Governance Committee and the Board shall give reasonable deference to the Adviser’s suggestions of candidates.

When evaluating a person as a potential nominee to serve as an independent Trustee, the Committee will generally consider, among other factors: age; education; relevant business experience; geographical factors; whether the person is “independent” and otherwise qualified under applicable laws and regulations to serve as a Trustee; and whether the person is willing to serve, and willing and able to commit the time necessary for attendance at meetings and the performance of the duties of an independent Trustee. The Committee also meets personally with the nominees and conducts a reference check. The final decision is based on a combination of factors, including the strengths and the experience an individual may bring to the Board. The Committee believes the Board generally benefits from diversity of background, experience and views among its members, and considers this a factor in evaluating the composition of the Board, but has not adopted any specific policy in this regard.

Officers, except for the Chief Compliance Officer (“CCO”), and the Trustee affiliated with the Adviser serve without any compensation from the Trust. The Trust pays a portion of the CCO’s compensation. Trustees who are not affiliated with the Adviser (“Independent Trustees”) receive an annual retainer plus per meeting fees (which vary depending on whether the meeting is in person or telephonic). Independent Trustees also receive compensation for attendance at committee meetings. The Chairperson of the Board and the chairpersons of the Audit Committee and Nominating and Governance Committee each receive an additional retainer for serving in such positions. The following table sets forth the compensation paid by the Trust during the fiscal year ended December 31, 2015 to each of the Independent Trustees and the CCO:

The following table sets forth, for each Trustee, the dollar range of equity securities owned in the Funds as of December 31, 2015. In addition, the last row shows the aggregate dollar range of equity securities owned as of December 31, 2015 in all series of the Trust.

As of March 31, 2016, the Trust’s officers and Trustees as a group owned (or held a shared investment or voting power with respect to) shares of each Fund in the percentages shown in the following table:

Persons are deemed to control a Fund when they own beneficially over 25% of the Fund’s outstanding shares. As a result, those persons could have the ability to vote a majority of the shares of a Fund on any matter requiring the approval of the shareholders of that Fund and therefore can control the Fund and determine the outcome of a Shareholders Meeting. Richard H. Driehaus is deemed a control person of the Driehaus Frontier Emerging Markets Fund.

As of March 31, 2016, the following persons were known to the Trust to be beneficial or record owners (having sole voting and dispositive power) of 5% or more of the shares of beneficial interest of a Fund:

More than 75 percent of the Board members are classified under the 1940 Act as not being “interested persons” of the Trust and are often referred to as “Independent Trustees.” In addition to investing in the Funds and various other funds of the Trust, Independent Trustees may invest in limited partnerships that are managed by the Adviser and an affiliate of the Adviser. The Independent Trustees may also, from time to time, invest in other investment ventures in which affiliates and employees of the Adviser also invest.

As of December 31, 2015, no Independent Trustee or his or her immediate family members held the beneficial or record ownership of the securities of any entity other than another registered investment company, controlling, controlled by or under common control with the Adviser.

The Adviser is controlled by Richard H. Driehaus. The principal nature of Mr. Driehaus’ business is investment advisory and distribution services. The Adviser provides office space and executive and other personnel to the Trust. The Trust pays all expenses other than those paid by the Adviser, including but not limited to printing and postage charges and securities registration and custodian fees and expenses incidental to its organization.

The advisory agreement provides that neither the Adviser nor any of its directors, officers, stockholders, agents or employees shall have any liability to the Funds or any shareholder of the Funds for any error of judgment, mistake of law or any loss arising out of any investment, or for any other act or omission in the performance by the Adviser of its duties under the agreement, except for liability resulting from willful misfeasance, bad faith or gross negligence on its part in the performance of its duties or from reckless disregard by it of its obligations and duties under the agreement.

Any expenses that are attributable solely to the organization, operation or business of a Fund shall be paid solely out of the Fund’s assets. Any expenses incurred by the Trust that are not solely attributable to a particular series are apportioned in such manner as the Adviser determines is fair and appropriate, unless otherwise specified by the Board.

Prior to May 1, 2016, the Driehaus Emerging Markets Growth Fund paid the Adviser an annual management fee on a monthly basis of 1.50% of average daily net assets. Beginning on May 1, 2016, the Driehaus Emerging Markets Growth Fund will pay the Adviser an annual management fee on a monthly basis as follows: 1.50% of average daily net assets up to $1.5 billion, 1.00% of average daily net assets on the next $500 million and 0.75% of average daily net assets in excess of $2.0 billion. The Driehaus Emerging Markets Small Cap Growth Fund, Driehaus Frontier Emerging Markets Fund and Driehaus International Small Cap Growth Fund pay the Adviser an annual management fee on a monthly basis of 1.50% of average daily net assets. The Adviser entered into a contractual agreement through August 21, 2014 to waive its advisory fee and/or reimburse operating expenses (other than interest, taxes, brokerage commissions, dividends and interest on short sales and other investment-related costs and extraordinary expenses) to the extent necessary to ensure that the Driehaus Emerging Markets Small Cap Growth Fund’s total annual operating expenses did not exceed 2.00% of average daily net assets. For a period of three years subsequent to the Driehaus Emerging Markets Small Cap Growth Fund’s commencement of operations (i.e., through August 21, 2014), the Adviser was entitled to reimbursement for previously waived fees and reimbursed expenses to the extent that the Fund’s expense ratio remained below its operating expense cap. The Driehaus Micro Cap Growth Fund pays the Adviser an annual management fee on a monthly basis of 1.25% of average daily net assets. The Adviser has entered into a contractual agreement effective through November 18, 2016 to waive a portion of its management fee and/or reimburse operating expenses to the extent necessary to cap the Fund’s ordinary operating expenses (which excludes interest, taxes, brokerage commissions, other investment-related costs and extraordinary expenses) to the extent necessary to ensure that the Driehaus Micro Cap Growth Fund’s total annual operating expenses does not exceed 1.70% of average daily net assets. Pursuant to the agreement, and so long as the investment advisory agreement is in place, for a period not to exceed three years from the Fund’s commencement of operations on November 18, 2013, the Adviser is entitled to reimbursement for previously waived fees and reimbursed expenses to the extent that the Fund’s ordinary annual operating expenses remain below the 1.70% cap. The Adviser entered into a contractual agreement to cap the Frontier Emerging Markets Fund’s ordinary annual operating expenses (excluding interest, taxes, brokerage commissions and other investment-related costs and extraordinary expenses) at 2.00% of

average daily net assets until the earlier of the termination of the investment advisory agreement, by the Board of Trustees or the Fund’s shareholders, or May 3, 2018. Pursuant to the agreement, and so long as the investment advisory agreement is in place, for a period of three years subsequent to the Fund’s commencement of operations on May 4, 2015, the investment adviser is entitled to reimbursement for previously waived fees and reimbursed expenses to the extent that the Fund’s expense ratio remains below the operating expense cap that was in place at the time of the waiver.

The following table shows the advisory fees paid by each Fund under the advisory agreement to the Adviser, fees waived or expenses reimbursed, and the amount of prior waivers recaptured by the Adviser for each Fund’s last three fiscal years.

Code of Ethics. The Adviser, the Trust and the Distributor have adopted a code of ethics pursuant to Rule 17j-1 under the 1940 Act. Access persons (as defined in the code of ethics) are permitted to make personal securities transactions, including transactions in securities that may be purchased or held by the Funds, subject to requirements and restrictions set forth in such code of ethics. The code of ethics contains provisions and requirements designed to identify and address certain conflicts of interest between personal investment activities and the interests of the Funds. The code of ethics also prohibits certain types of transactions absent prior approval, imposes time periods during which personal transactions may not be made in certain securities unless there is a permitted code exception, and requires the submission of broker confirmations and reporting of securities transactions. Exceptions to these and

other provisions of the code of ethics may be granted in particular circumstances in accordance with stated criteria after review by appropriate personnel.

Proxy Voting. The Board has delegated to the Adviser the responsibility for determining how to vote proxies relating to the Funds’ portfolio securities, and the Adviser retains the final authority and responsibility for such voting. The Adviser has provided the Funds with a copy of its written proxy voting policy, and it documents the reasons for voting, maintains records of the Funds’ voting activities and monitors voting activity for potential conflicts of interest.

In order to facilitate this proxy voting process, the Adviser has retained a proxy voting service to assist the firm with in-depth proxy research, vote execution, and the necessary record keeping. The proxy voting service is an investment adviser that specializes in providing a variety of fiduciary-level services related to proxy voting. In addition to analyses, the proxy voting service delivers to the Adviser voting reports that reflect the Funds’ voting activities, enabling the Funds to monitor voting activities performed by the Adviser.

The Adviser’s proxy voting policy sets forth the general voting guidelines that the proxy voting service follows on various types of issues when there are no company-specific reasons for voting to the contrary. In making the proxy voting decision, there are two overriding considerations: first, the economic impact of the proposal; and second, whether it would be in the best interests of the affected Fund for the proposal to pass or not pass. The proxy voting service performs company-by-company analyses, which means that all votes are reviewed on a case-by-case basis and no issues are considered routine. Each issue is considered in the context of the company under review. The Adviser generally follows the proxy voting service’s recommendations and does not use its discretion in the proxy voting decision. For this reason, proxies are voted in the Funds’ best interests, in accordance with a predetermined policy based upon recommendations of an independent third party, and are not affected by any potential or actual conflict of interest of the Adviser.

Information regarding how the Funds voted proxies during the 12-month period ended June 30^th is available without charge, upon request, by calling 1-800-560-6111. This information is also available on the Funds’ web site at www.driehaus.com and on the SEC’s web site at www.sec.gov.

Trade Allocation. The Adviser manages not only the Funds but other investment accounts, including accounts of affiliated persons of the Adviser. Simultaneous transactions may occur when the Funds and investment accounts are managed by the same investment adviser and the same security is suitable for the investment objective of more than one Fund or investment account. When two or more investment accounts are simultaneously engaged in the purchase or sale of the same security, including initial public offerings (“IPOs”), the prices and amounts are allocated in accordance with procedures, established by the Adviser, and believed to be appropriate and equitable for each investment account. In some cases, this process could have a detrimental effect on the price or value of the security as far as each Fund is concerned. In other cases, however, the ability of the Funds to participate in volume transactions may produce better executions and prices for the Funds.

Description of Compensation. Each portfolio manager and assistant portfolio manager is paid a fixed salary plus a bonus. They each receive bonuses which are based on a percentage of management fees paid by the registered investment companies and other accounts managed, as applicable. In addition, if the performance of a Fund exceeds certain percentile benchmarks when compared to its peer group (primarily using Lipper rankings) and/or certain risk adjusted return formulas, they each earn a specified additional percentage of the management fees paid by the registered investment companies and other accounts managed. They also each receive a bonus based on a percentage of any performance-based fees paid by the registered investment companies and other accounts managed, if applicable. Messrs. Carpenter, Buck and DeBruin also receive a bonus based on a percentage of their salary, which has both subjective and

If the Adviser declares a profit sharing plan contribution, the portfolio managers and assistant portfolio managers also would receive such contribution. Each portfolio manager and assistant portfolio manager is eligible to participate in an equity purchase plan available to certain key employees of the Adviser. Messrs. Schwab, Cleaver, Mouser and James are also participants in a deferred compensation plan.

Other Accounts. The table below discloses other accounts for which the portfolio managers are primarily responsible for the day-to-day portfolio management as of December 31, 2015.

As shown in the table above, the portfolio managers may manage the assets of more than one registered investment company (each a “Fund”), other pooled investment vehicles and/or other accounts (collectively, the “Accounts”) for the Adviser. Both clients and affiliated persons of the Adviser, including the portfolio managers, may own interests in these Accounts. The same or related securities may be appropriate and desirable investments for both a Fund and the Accounts (including another fund) and they may compete in the marketplace for the same investment opportunities, which may be limited. In addition, transactions by the Accounts in securities held by a Fund or that a Fund is seeking to buy or sell (or transactions in related securities) may have an adverse impact on the prices that a Fund pays for those securities or can realize upon sale, or on the ability of the Adviser to buy or sell the desired amount of such securities for a Fund at favorable prices. This is particularly true when the Accounts’ transactions occur at a point in time close to when trades in the same or related securities are effected for a Fund. This presents a conflict between the interests of the Fund and the interests of the Accounts as well as the affiliates of the Adviser who invest in the Accounts.

Conflicts also may arise between the interests of a Fund and the interests of the Adviser and its affiliates, including the portfolio managers. These conflicts can occur as one or more of the Accounts pay advisory fees to the Adviser, including performance-based compensation, at a higher rate than the rate of fees paid by the Funds. In addition, the Adviser’s affiliates, including the Funds’ portfolio managers, may personally own interests in the Accounts or have other financial incentives (including that a portfolio manager’s compensation is based, in part, on assets under management). For example, portfolio managers could favor an Account over a Fund when dividing their time and attention between them or when presented with limited investment opportunities that would be desirable and suitable for both a Fund and the Accounts or when making trading decisions.

The Adviser, through trade allocation and other policies and procedures, seeks to manage these conflicts of interest to reduce any adverse effects on either a Fund or the Accounts. These policies and procedures include requirements that transactions by a Fund and the Accounts in the same securities that occur on the same day are average priced when feasible and allocated on a fair and equitable basis. In addition, the Adviser conducts periodic reviews of transactions in and holdings of the same or related securities by a Fund and the Accounts for compliance with the Adviser’s policies and procedures.

Securities Ownership. The following table sets forth the dollar range of equity securities beneficially owned by each portfolio manager in the Funds as of December 31, 2015.

In addition to the amounts disclosed in the table above, Messrs. Schwab, Cleaver, Mouser and James participate in a deferred compensation plan in which they earn an investment return based on a hypothetical investment in various funds that they elect, which may include the Funds that they manage. The following table sets forth the dollar range of each portfolio manager’s deferred compensation plan account as of December 31, 2015 that is earning an investment return based on a hypothetical investment in the Funds that they manage:

The shares of the Funds are distributed by DS LLC, 25 East Erie Street, Chicago, Illinois 60611, under a Distribution Agreement with the Trust. DS LLC is an affiliate of the Adviser because both entities are controlled by Richard H. Driehaus. The Distribution Agreement had an initial period of two years and continues in effect thereafter from year to year, provided such continuance is approved annually (i) by a majority of the Trustees or by a majority of the outstanding voting securities of the Trust, and (ii) by a majority of the Trustees who are not parties to the agreement or interested persons of any such party. The Trust has agreed to pay all expenses in connection with registration of its shares with the SEC and auditing and filing fees in connection with registration of its shares under the various state blue sky laws and assumes the cost of preparation of prospectuses and other expenses.

As agent, DS LLC will offer shares of the Funds on a continuous basis to investors in states where the shares are qualified for sale, at net asset value, without sales commissions or other sales load to the investor. In addition, no sales commission or “12b-1 fees” are paid by the Funds. As principal underwriter to the Trust, DS LLC enters into arrangements with selected dealers or other third parties for the sale and redemption of Fund shares and makes payments to such entities for distribution related activities as well as shareholder and administrative services to customers who purchase Fund shares, including sub-accounting and sub-transfer agency services. DS LLC will offer the Funds’ shares only on a best-efforts basis.

BNY Mellon Investment Servicing (US) Inc. (“BNY Mellon”), with corporate offices at 301 Bellevue Parkway, Wilmington, Delaware 19809, is the administrator for the Funds. The asset-based fee for administration and accounting services for each Fund is calculated as follows:

The Funds paid the following administrative fees for the past three fiscal years:

The Northern Trust Company at 50 South LaSalle Street, Chicago, Illinois 60603, is the Funds’ custodian (the “Custodian”). The Custodian is responsible for holding all securities and cash of the Funds, receiving and paying for securities purchased, delivering against payment securities sold, receiving and collecting income from investments and performing other administrative duties, all as directed by authorized persons. The Custodian does not exercise any supervisory function in such matters as purchase and sale of portfolio securities, payment of dividends or payment of expenses of the Funds.

Portfolio securities purchased in the U.S. are maintained in the custody of the Custodian or of other domestic banks or depositories. Portfolio securities purchased outside of the U.S. are maintained in the custody of foreign banks and trust companies that are members of the Custodian’s global custody network and foreign depositories (“foreign subcustodians”). With respect to foreign subcustodians, there can be no assurance that a Fund, and the value of its shares, will not be adversely affected by acts of foreign governments, financial or operational difficulties of the foreign subcustodians, difficulties and costs of obtaining jurisdiction over, or enforcing judgments against, the foreign subcustodians, or application of foreign law to a Fund’s foreign subcustodial arrangements. Accordingly, an investor should recognize that the non-investment risks involved in holding assets abroad are greater than those associated with investing in the United States.

The Funds may invest in obligations of the Custodian and may purchase or sell securities from or to the Custodian.

BNY Mellon, 760 Moore Road, King of Prussia, Pennsylvania 19406, is the Funds’ transfer agent, registrar, dividend-disbursing agent and shareholder servicing agent. As such, BNY Mellon provides certain bookkeeping and data processing services and services pertaining to the maintenance of shareholder accounts.

Ernst & Young LLP, 155 North Wacker Drive, Chicago, Illinois 60606, is the Funds’ independent registered public accounting firm (“auditors”). The auditors audit and report on each Fund’s annual financial statements, review certain regulatory reports and each Fund’s federal income tax returns, and perform other professional accounting, auditing, tax and advisory services when pre-approved by the Trust’s Audit Committee and engaged to do so by the Trust.

Vedder Price P.C., 222 North LaSalle Street, Chicago, Illinois 60601, acts as the Trust’s legal counsel and as counsel to the Independent Trustees.

The Adviser’s overriding objective in effecting portfolio transactions is to seek to obtain the best combination of price and execution with a view to providing each Fund the most favorable terms reasonably available under the circumstances. The best price, giving effect to brokerage commissions, if any, and other transaction costs, normally is an important factor in this decision, but a number of other judgmental factors may also enter into the decision. These factors include the Adviser’s knowledge of: negotiated commission rates currently available and other current transaction costs; the nature of the security being traded; the size of the transaction; the desired timing of the trade; the activity existing and expected in the market for the particular security; confidentiality; the execution, clearance and settlement capabilities of the broker or dealer selected and others which are considered; the financial stability of the broker or dealer selected and such other brokers or dealers; and actual or apparent operational problems of any broker or dealer. Recognizing the value of these factors, the Adviser may cause a Fund to pay a brokerage commission in excess of that which another broker or dealer may have charged for effecting the same transaction, provided that the Adviser determines in good faith that the commission is reasonable in relation to the services received. Evaluations of the reasonableness of brokerage commissions, based on the foregoing factors, are made on an ongoing basis by the Adviser’s staff while effecting portfolio transactions.

To the extent directed by management of the Funds, the Adviser will execute purchases and sales of portfolio securities for a Fund through brokers or dealers for the purpose of providing direct benefits to the Fund, subject to the Adviser seeking best execution. However, brokerage commissions or transaction costs in such transactions may be higher, and a Fund may receive less favorable prices than those which the Adviser could obtain from another broker or dealer, in order to obtain such benefits for a Fund.

For the fiscal year ended December 31, 2015, the Driehaus Emerging Markets Growth Fund paid brokerage commissions of $11,597,479; Driehaus Emerging Markets Small Cap Growth Fund paid brokerage commissions of $16,490,802; Driehaus International Small Cap Growth Fund paid brokerage commissions of $1,370,932; and Driehaus Micro Cap Growth Fund paid brokerage commissions of $950,087. For the period May 4, 2015 (commencement of operations) through December 31, 2015, the

For the fiscal year ended December 31, 2014, the Driehaus Emerging Markets Growth Fund paid brokerage commissions of $15,925,672; Driehaus Emerging Markets Small Cap Growth Fund paid brokerage commissions of $9,964,982; Driehaus International Small Cap Growth Fund paid brokerage commissions of $1,438,297; and Driehaus Micro Cap Growth Fund paid brokerage commissions of $610,306.

For the fiscal year ended December 31, 2013, the Driehaus Emerging Markets Growth Fund paid brokerage commissions of $11,023,421; Driehaus Emerging Markets Small Cap Growth Fund paid brokerage commissions of $3,221,064; and Driehaus International Small Cap Growth Fund paid brokerage commissions of $1,910,193. For the period November 18, 2013 (commencement of operations) through December 31, 2013, Driehaus Micro Cap Growth Fund paid brokerage commissions of $46,294.

With respect to issues of securities involving brokerage commissions, when more than one broker or dealer is believed to be capable of providing the best combination of price and execution with respect to a particular portfolio transaction for a Fund, the Adviser may select a broker or dealer that furnishes it with brokerage or research services such as research reports, subscriptions to financial publications and research compilations, compilations of securities prices, earnings, dividends and similar data, computer data bases, quotation equipment and services, research-oriented computer software and services, monitoring and reporting services, and services of economic and other consultants consistent with Section 28(e) of the Securities Exchange Act of 1934, as amended. As a result of such research, the Adviser may cause a Fund to pay commissions that are higher than otherwise obtainable from other brokers, provided that the Adviser determines in good faith that the commissions are reasonable in relation to the brokerage or research services provided by the broker. Selection of brokers or dealers is not made pursuant to an agreement or understanding with any of the brokers or dealers; however, the Adviser uses an internal allocation procedure to identify those brokers or dealers who provide it with research products or services and the amount of research products or services they provide, and endeavors to direct sufficient commissions generated by its clients’ accounts in the aggregate, including the Funds, to ensure the continued receipt of research products or services the Adviser feels are useful. In certain instances, the Adviser may receive from brokers and dealers products or services that are used both as investment research and for administrative, marketing or other nonresearch purposes. In such instances, the Adviser will make a good faith effort to determine the relative proportions of such products or services which may be considered as investment research, and this allocation process poses a potential conflict of interest to the Adviser. The portion of the costs of such products or services attributable to research usage may be defrayed by the Adviser (without prior agreement or understanding, as noted above) through brokerage commissions generated by transactions by clients (including the Funds), while the portions of the costs attributable to nonresearch usage of such products or services is paid by the Adviser in cash. Research products or services furnished by brokers and dealers may be used in servicing any or all of the clients of the Adviser, and not all such research products or services are used in connection with the management of the Funds. Information received from brokers by the Adviser will be in addition to, and not in lieu of, the services required to be performed under the advisory agreement. Any advisory or other fees paid to the Adviser are not reduced as a result of the receipt of research services.

Directed Brokerage. During the year ended December 31, 2015, certain Funds allocated a portion of their brokerage transactions to firms based upon research services and information provided. The table below shows the amount of brokerage transactions allocated and related commissions paid by the Funds during the fiscal year ended December 31, 2015.

Regular Broker-Dealers. The following information is provided with respect to the Funds’ “regular broker-dealers.” The term “regular broker-dealers” means, any of the ten brokers or dealers who, for the fiscal year ended December 31, 2015: 1) received the greatest dollar amount of brokerage commissions from the Funds; 2) engaged as principal in the largest dollar amount of portfolio transactions for the Funds; or 3) sold the largest dollar amount of securities of the Funds. The Funds did not hold any securities of their “regular broker-dealers” at December 31, 2015.

The following is intended to be a general summary of certain U.S. federal income tax consequences of investing in a Fund. It is not intended to be a complete discussion of all such consequences, nor does it purport to deal with all categories of investors. This discussion reflects the applicable federal income tax laws of the United States as of the date of this SAI, which tax laws may change or be subject to new interpretation by the courts or the Internal Revenue Service (“IRS”), possibly with retroactive effect.

Each Fund is treated as a separate entity for federal income tax purposes and has qualified, and each intends to continue to comply with the provisions of Subchapter M of the Internal Revenue Code of 1986, as amended (the “Code”), to permit it, to be treated as a regulated investment company. Such provisions generally relieve a Fund of federal income tax to the extent its investment company taxable income (determined without regard to the deduction for dividends paid by the Fund) and net capital gains (i.e., the excess of net long-term capital gains over the sum of net short-term capital losses and capital loss carryforwards available from prior years) are currently distributed to shareholders. In order to qualify for such provisions, each Fund must, among other things, maintain a diversified portfolio, which requires that at the close of each quarter of the taxable year (i) at least 50% of the market value of its total assets is represented by cash or cash items, U.S. government securities, securities of other regulated investment companies and securities of other issuers with such other securities limited, in respect of any one issuer, to an amount not greater in value than 5% of the value of the Fund’s total assets and not more than 10% of the outstanding voting securities of such issuer; and (ii) not more than 25% of the market value of the total assets of the Fund are invested in the securities (other than government securities or the securities of other regulated investment companies) of any one issuer or of two or more issuers which the Fund controls and which are determined to be engaged in the same, similar or related trades or business, or the securities of one or more qualified publicly traded partnerships. The requirements for qualification as a regulated investment company may limit the extent to which a Fund may invest in some investments.

generally constitute ordinary dividends, which would generally be eligible for the dividends received deduction available to corporate shareholders under Section 243 of the Code, and individual and other noncorporate shareholders of the Fund generally would be able to treat such distributions as “qualified dividend income” under Section 1(h)(11) of the Code, as discussed below, provided certain holding period and other requirements are satisfied.

Distributions of investment company taxable income, which includes net investment income, net short-term capital gain in excess of net long-term capital loss and certain net foreign exchange gains, are generally taxable as ordinary income to the extent of the Fund’s current and accumulated earnings and profits. Under Section 1(h)(11) of the Code, qualified dividend income received by individual and other noncorporate shareholders is taxed for federal income tax purposes at rates equivalent to long-term capital gain tax rates, which currently reach a maximum of 20%. Qualified dividend income generally includes dividends from certain domestic corporations and dividends from “qualified foreign corporations.” For these purposes, a qualified foreign corporation is a foreign corporation (i) that is incorporated in a possession of the United States or is eligible for benefits under a qualifying income tax treaty with the United States, or (ii) whose stock with respect to which such dividend is paid is readily tradable on an established securities market in the United States. A qualified foreign corporation does not include a foreign corporation which for the taxable year of the corporation in which the dividend was paid, or the preceding taxable year, is a “passive foreign investment company,” as defined in the Code.

A Fund generally can pass the federal income tax treatment of qualified dividend income it receives through to its shareholders to the extent of the aggregate qualified dividends received by the Fund. For a Fund to receive qualified dividend income, the Fund must meet certain holding period and other requirements with respect to the stock on which the otherwise qualified dividend is paid. In addition, the Fund cannot be obligated to make payments (pursuant to a short sale or otherwise) with respect to substantially similar or related property. If a Fund lends portfolio securities, amounts received by the Fund that are the equivalent of the dividends paid by the issuer on the securities loaned will not be eligible for qualified dividend income treatment. The same provisions, including the holding period requirements, apply to each shareholder’s investment in the Fund. If a Fund receives dividends from another fund that qualifies as a regulated investment company and the other fund designates such dividends as qualified dividend income, then the Fund may in turn designate that portion of its distributions derived from those dividends as qualified dividend income as well, provided the Fund meets the holding period and other requirements with respect to its shares of the other fund. Distributions of net capital gain, if any, are taxable as long-term capital gains for U.S. federal income tax purposes without regard to the length of time the shareholder has held shares of the Fund. A distribution of an amount in excess of a Fund’s current and accumulated earnings and profits, if any, will be treated by a shareholder as a tax-free return of capital which is applied against and reduces the shareholder’s basis in his or her shares. To the extent that the amount of any such distribution exceeds the shareholder’s basis in his or her shares, the excess will be treated by the shareholder as gain from the sale or exchange of shares. The U.S. federal income tax status of all distributions will be designated by the Fund and reported to the shareholders annually.

Dividends declared in October, November or December to shareholders of record as of a date in such month and paid during the following January are treated as if received on December 31 of the calendar year declared.

Because dividend and capital gain distributions reduce net asset value, a shareholder who purchases shares shortly before a Fund pays a dividend or distribution will, in effect, receive a return of a portion of his or her investment in such dividend or distribution. The dividend or distribution would nonetheless be taxable to the shareholder (if shares are held in a taxable account), even if the net asset value of shares was reduced below such shareholder’s cost. However, for federal income tax purposes, the shareholder’s original cost would continue as his or her tax basis, except as set forth above with respect to returns of capital.

To the extent a Fund invests in foreign securities, it may be subject to withholding and other taxes imposed by foreign countries. Tax treaties between certain countries and the United States may reduce or eliminate such taxes. Because the amount of a Fund’s investments in various countries will change from time to time, it is not possible to determine the effective rate of such taxes in advance. Shareholders may be entitled to claim U.S. foreign tax credits with respect to such taxes, subject to certain provisions and limitations contained in the Code. Specifically, if more than 50% of the value of a Fund’s total assets at the close of any taxable year consists of stock or securities in foreign corporations, and such Fund distributes at least 90% of its investment company taxable income (determined without regard to the deduction for dividends paid) and net tax exempt interest, if any, the Fund may file an election with the IRS pursuant to which shareholders of the Fund will be required to (i) include in gross income (in addition to taxable dividends actually received) their pro rata shares of foreign income taxes paid by the Fund even though not actually received, (ii) treat such respective pro rata shares as foreign income taxes paid by them, and (iii) deduct such pro rata shares in computing their U.S. federal taxable income, or, alternatively, use them as foreign tax credits against their U.S. federal income tax liability, subject in both cases to applicable limitations. Shareholders who do not itemize deductions for federal income tax purposes will not, however, be able to deduct their pro rata portion of foreign taxes paid by such Fund, although such shareholders may be able to claim a credit for foreign taxes paid and in any event will be required to include their share of such taxes in gross income. Tax-exempt shareholders will not ordinarily benefit from this election relating to foreign taxes. Each year, the Funds will notify their respective shareholders of the amount of each shareholder’s pro rata share of foreign income taxes paid by such Fund, if the Fund qualifies to pass along such credit. If a Fund does not make such an election, the net investment income of that particular Fund will be reduced by the foreign taxes paid by the Fund and its shareholders will not be required to include in their gross income and will not be able to claim a credit or deduction for their pro rata share of foreign taxes paid by the Fund.

Each Fund may engage in certain options, futures, forwards, swaps, short sales, foreign currency and other transactions. These transactions may be subject to special provisions under the Code that may accelerate or defer recognition of certain gains or losses, change the character of certain gains or losses or alter the holding periods of certain of the Fund’s portfolio securities. These rules could therefore affect the character, amount and timing of distributions made to shareholders.

For federal income tax purposes, each Fund generally is required to recognize as income for each taxable year its net unrealized capital gains and losses as of the end of the year on certain futures, futures options, non-equity options positions and certain foreign currency contracts (“year-end mark-to-market”). Generally, any gain or loss recognized with respect to such positions is considered to be 60% long-term capital gain or loss and 40% short-term capital gain or loss, without regard to the holding periods of the positions. However, in the case of positions classified as part of a “mixed straddle,” in which an election is properly made, the recognition of losses on certain positions (including options, futures and futures options positions, the related securities and certain successor positions thereto) may be deferred to a later taxable year. Sale of futures contracts or writing of call options (or futures call options) or buying put options (or futures put options) that are intended to hedge against a change in the value of securities held by a Fund: (i) will generally affect the holding period of the hedged securities; and (ii) may cause unrealized gain or loss on such securities to be recognized upon entry into the hedge.

A Fund’s entry into a short sale transaction, an option or certain other contracts could be treated as the constructive sale of an appreciated financial position, causing the Fund to realize gain, but not loss, on the position.

Foreign exchange gains and losses realized by the Fund in connection with certain transactions involving foreign currency-denominated debt securities, certain options and futures contracts relating to foreign currency, foreign currency forward contracts, foreign currencies, or payables or receivables denominated in a foreign currency are subject to Section 988 of the Code, which generally causes such gain and loss to

be treated as ordinary income or loss and may affect the amount, timing and character of distributions to shareholders.

The Funds may enter into swaps or other notional principal contracts. Payments made or received pursuant to the terms of a notional principal contract are divided into three categories, (i) a “periodic” payment; (ii) a “nonperiodic” payment; and (iii) a “termination” payment. Periodic payments are payments made or received pursuant to a notional principal contract that are payable at intervals of one year or less during the entire term of the contract, that are based on certain types of specified indexes (which include indexes based on objective financial information), and that are based on either a single notional principal amount or a notional principal amount that varies over the term of the contract in the same proportion as the notional principal amount that measures the other party’s payments. A nonperiodic payment is any payment made or received with respect to a notional principal contract that is not a periodic payment or a “termination payment.” All taxpayers, regardless of their method of accounting, must generally recognize for federal income tax purposes the ratable daily portion of a periodic and a nonperiodic payment for the taxable year to which that payment relates.

The application of certain requirements for qualification as a regulated investment company and the application of certain other federal income tax rules may be unclear in some respects in connection with investments in certain derivatives and other investments. As a result, a Fund may be required to limit the extent to which it invests in such investments and it is also possible that the IRS may not agree with a Fund’s treatment of such investments. In addition, the tax treatment of derivatives and certain other investments may be affected by future legislation, Treasury Regulations and guidance issued by the IRS (which could apply retroactively) that could affect the timing, character and amount of a Fund’s income and gains and distributions to shareholders, affect whether a Fund has made sufficient distributions and otherwise satisfied the requirements to maintain its qualification as a regulated investment company and avoid federal income and excise taxes or limit the extent to which a Fund may invest in certain derivatives and other investments in the future.

If a Fund invests in certain pay-in-kind securities, zero coupon securities, deferred interest securities or, in general, any other securities with original issue discount (or with market discount if the Fund elects to include market discount in income currently), the Fund must accrue income on such investments for each taxable year, which generally will be prior to the receipt of the corresponding cash payments. However, the Fund must distribute to shareholders, at least annually, all or substantially all of its investment company taxable income (determined without regard to the deduction for dividends paid), including such accrued income, to avoid federal income and excise taxes. Therefore, the Fund may have to dispose of its portfolio securities under disadvantageous circumstances to generate cash, or may have to leverage itself by borrowing the cash, to satisfy these distribution requirements.

A Fund may also acquire market discount bonds. A market discount bond is a security acquired in the secondary market at a price below its redemption value (or its adjusted issue price if it is also an original issue discount bond). If the Fund invests in a market discount bond, it will be required to treat any gain recognized on the disposition of such market discount bond as ordinary income (instead of capital gain) to the extent of the accrued market discount unless the Fund elects to include the market discount in income as it accrues.

A Fund’s investment in lower-rated or unrated debt securities may present issues for the Fund if the issuers of these securities default on their obligations because the federal income tax consequences to a holder of such securities are not certain.

company that qualifies as a regulated investment company realizes net losses on its investments for a given taxable year, the Fund will not be able to recognize its share of those losses until it disposes of shares of such investment company. Moreover, even when the Fund does make such a disposition, a portion of its loss may be recognized as a long-term capital loss, which will not be treated as favorably for federal income tax purposes as an ordinary deduction. In particular, the Fund will not be able to offset any capital losses from its dispositions of shares of other investment companies against its ordinary income. As a result of the foregoing rules, and certain other special rules, it is possible that the amounts of net investment income and net capital gains that the Fund will be required to distribute to shareholders will be greater than such amounts would have been had the Fund invested directly in the securities held by the investment companies in which it invests, rather than investing in shares of the investment companies. For similar reasons, the character of distributions from the Fund (e.g., long-term capital gain, qualified dividend income, etc.) will not necessarily be the same as it would have been had the Fund invested directly in the securities held by the investment companies in which it invests.

Each Fund anticipates distributing to shareholders annually all net capital gains, if any that have been recognized for federal income tax purposes including year-end mark-to-market gains. Shareholders will be advised of the nature of these payments.

Each Fund is subject to a nondeductible 4% federal excise tax on the excess of the required distribution for a calendar year over the distributed amount for such calendar year. The required distribution is the sum of 98% of the Fund’s ordinary income for the calendar year plus 98.2% of its capital gain net income for the one-year period ending October 31, plus any undistributed amounts from prior calendar years, minus any overdistribution from prior calendar years. For purposes of calculating the required distribution, foreign currency gains or losses occurring after October 31 are taken into account in the following calendar year. The Funds intend to declare or distribute dividends during the appropriate periods of an amount sufficient to prevent imposition of this 4% excise tax.

A shareholder who redeems or exchanges shares of a Fund will generally recognize capital gain or loss for federal income tax purposes measured by the difference between the value of the shares redeemed or exchanged and the basis of such shares. If a shareholder held such shares for more than one year, the gain, if any, will be a long-term capital gain. Long-term capital gain is taxable to individual and other non-corporate shareholders at a maximum federal income tax rate of 20%. The gain or loss on shares held for one year or less will generally be treated as short-term capital gain or loss. If a shareholder realizes a loss on the redemption of a Fund’s shares and reinvests in substantially identical shares of the Fund (including through dividend reinvestment) or other substantially identical stock or securities within 30 days before or after the redemption, the transactions may be subject to the “wash sale” rules resulting in a postponement of the recognition of such loss for federal income tax purposes. In such a case, the basis of the shares acquired will be adjusted to reflect the disallowed loss. Any loss realized on the redemption of Fund shares held for six months or less will be treated as long-term capital loss to the extent of any long-term capital gain distributions received by the shareholder with respect to such shares. Capital losses may be subject to limitations on their use by a shareholder.

An additional 3.8% Medicare tax is imposed on certain net investment income (including ordinary dividends and capital gain distributions received from a Fund and net gains from redemptions or other taxable dispositions of Fund shares) of U.S. individuals, estates and trusts to the extent that such person’s “modified adjusted gross income” (in the case of an individual) or “adjusted gross income” (in the case of an estate or trust) exceeds a threshold amount.

Passive Foreign Investment Companies. Each Fund may purchase the securities of certain foreign investment funds or trusts called passive foreign investment companies (“PFICs”). In addition to bearing their proportionate share of the Fund’s expenses (management fees and operating expenses), shareholders will also indirectly bear similar expenses of such PFICs. Gains on the sale of PFIC holdings will be deemed to be ordinary income regardless of how long the Fund holds its investment. In addition, each

Fund may be subject to corporate income tax and an interest charge on certain dividends and capital gains earned (or deemed earned) from PFICs, regardless of whether such income and gains are distributed to shareholders.

Each Fund intends to make a mark-to-market election, where applicable, to treat PFICs as sold on the last day of the Fund’s taxable year and recognize any gains for federal income tax purposes at that time; such losses may not be recognized or may be limited. Such gains will be considered ordinary income which the Fund will be required to distribute even though it has not sold the security and received cash to pay such distributions. In addition, under certain circumstances another election may be available that would require the Fund to include its share of the PFIC’s income and net capital gain annually in income, regardless of whether distributions are received from the PFIC in a given year.

Withholding. A Fund may be required to withhold, for U.S. federal income tax purposes, a portion of all distributions and redemption proceeds payable to a shareholder who fails to provide the Fund with his or her correct taxpayer identification number or who fails to make required certifications or if the Fund or a shareholder has been notified by the IRS that the shareholder is subject to backup withholding. Certain corporate and other shareholders specified in the Code and the regulations thereunder are exempt from backup withholding. Backup withholding is not an additional tax. Any amounts withheld may be credited against the shareholder’s U.S. federal income tax liability on such shareholder’s federal income tax return.

Cost Basis Information. The Funds are required to report to you and the IRS annually on Form 1099-B the cost basis of shares purchased or acquired on or after January 1, 2012 where the cost basis of the shares is known by the Funds (referred to as “covered shares”) and which are disposed of after that date. However, cost basis reporting is not required for certain shareholders, including shareholders investing in the Funds through a tax-advantaged arrangement, such as a 401(k) or an IRA.

When required to report cost basis, the Funds will calculate it using the Funds’ default method, which is the average cost basis, unless you instruct the Funds to use a different calculation method. For additional information regarding the Funds’ available cost basis reporting methods, including the default method, please contact the Funds. If you hold your Fund shares through a financial intermediary, please contact that intermediary with respect to reporting of cost basis and available elections for your account.

The IRS permits the use of several methods to determine the cost basis of mutual fund shares. The method used will determine which specific shares are deemed to be sold when there are multiple purchases on different dates at differing share prices, and the entire position is not sold at one time. The Funds do not recommend any particular method of determining cost basis, and the use of other methods may result in more favorable tax consequences for some shareholders. It is important that you consult with your tax advisor to determine which method is best for you and then notify the Funds if you intend to utilize a method other than the Funds’ default method for covered shares.

The Funds will compute and report the cost basis of your Fund shares sold or exchanged by taking into account all of the applicable adjustments to cost basis and holding periods as required by the Code and Treasury regulations for purposes of reporting these amounts to you and the IRS. However, the Funds are not required to, and in many cases the Funds do not possess the information to, take all possible basis, holding period or other adjustments into account in reporting cost basis information to you. Therefore, shareholders should carefully review the cost basis information provided by the Funds.

Non-U.S. shareholders, including shareholders who, with respect to the U.S., are nonresident alien individuals, may be subject to U.S. withholding tax on certain distributions (whether received in cash or shares) at a rate of 30% or such lower rate as prescribed by an applicable tax treaty. However, a Fund will generally not be required to withhold tax on any amounts paid to a non-U.S. investor with respect to dividends attributed to qualified short-term gain (i.e., the excess of net short-term capital gain over net long-term capital loss) designated as such by the Fund and dividends attributed to certain U.S. source

interest income that would not be subject to federal withholding tax if earned directly by a non-U.S. person, provided such amounts are properly designated by the Fund. A Fund may choose not to designate such amounts.

The Foreign Account Tax Compliance Act (“FATCA”) generally requires a Fund to obtain information sufficient to identify the status of each of its shareholders. If a shareholder fails to provide this information or otherwise fails to comply with FATCA, a Fund may be required to withhold under FATCA at a rate of 30% with respect to that shareholder on Fund dividends and distributions and on the proceeds of the sale, redemption, or exchange of Fund shares. A Fund may disclose the information that it receives from (or concerning) its shareholders to the IRS, non-U.S. taxing authorities or other parties as necessary to comply with FATCA, related intergovernmental agreements or other applicable law or regulation. Each investor is urged to consult its tax advisor regarding the applicability of FATCA and any other reporting requirements with respect to the investor’s own situation, including investments through an intermediary.

Investors are advised to consult their own tax advisors with respect to the application to their own circumstances of the above-described general federal income taxation rules and with respect to other federal, state, local or foreign tax consequences to them before investing in a Fund’s shares.

A rating of a rating service represents the service’s opinion as to the credit quality of the security being rated. However, the ratings are general and are not absolute standards of quality or guarantees as to the creditworthiness of an issuer. Consequently, the Adviser believes that the quality of debt securities in which the Fund may invest should be continuously reviewed and that individual analysts give different weights to the various factors involved in credit analysis. A rating is not a recommendation to purchase, sell or hold a security because it does not take into account market value or suitability for a particular investor. When a security has received a rating from more than one service, each rating should be evaluated independently. Ratings are based on current information furnished by the issuer or obtained by the rating services from other sources which they consider reliable. Ratings may be changed, suspended or withdrawn as a result of changes in or unavailability of such information, or for other reasons.

The following is a description of the characteristics of ratings of long-term corporate debt securities used by Moody’s Investors Service, Inc. (“Moody’s”) and Standard & Poor’s Corporation (“S&P”).

Aaa. Obligations rated Aaa are judged to be of the highest quality, subject to the lowest level of credit risk.

Aa. Obligations rated Aa are judged to be of high quality and are subject to very low credit risk.

A. Obligations rated A are considered upper-medium grade and are subject to low credit risk.

Baa. Obligations rated Baa are judged to be medium-grade and subject to moderate credit risk and as such may possess certain speculative characteristics.

Ba. Obligations rated Ba are judged to be speculative and are subject to substantial credit risk.

B. Obligations rated B are considered speculative and are subject to high credit risk.

Caa. Obligations rated Caa are judged to be speculative of poor standing and are subject to very high credit risk.

Ca. Obligations rated Ca are highly speculative and are likely in, or very near, default, with some prospect of recovery of principal and interest.

C. Obligations rated C are the lowest rated and are typically in default, with little prospect for recovery of principal or interest.

Note: Moody’s applies numerical modifiers 1, 2 and 3 in each generic rating classification from Aa through Caa. The modifier 1 indicates that the obligation ranks in the higher end of its generic rating category; the modifier 2 indicates a mid-range ranking; and the modifier 3 indicates a ranking in the lower end of that generic rating category.

AAA. An obligation rated ‘AAA’ has the highest rating assigned by Standard & Poor’s. The obligor’s capacity to meet its financial commitment on the obligation is extremely strong.

AA. An obligation rated ‘AA’ differs from the highest-rated obligations only to a small degree. The obligor’s capacity to meet its financial commitment on the obligation is very strong.

A. An obligation rated ‘A’ is somewhat more susceptible to the adverse effects of changes in circumstances and economic conditions than obligations in higher-rated categories. However, the obligor’s capacity to meet its financial commitment on the obligation is still strong.

BBB. An obligation rated ‘BBB’ exhibits adequate protection parameters. However, adverse economic conditions or changing circumstances are more likely to lead to a weakened capacity of the obligor to meet its financial commitment on the obligation.

Obligations rated ‘BB’, ‘B’, ‘CCC’, ‘CC’, and ‘C’ are regarded as having significant speculative characteristics. ‘BB’ indicates the least degree of speculation and ‘C’ the highest. While such obligations will likely have some quality and protective characteristics, these may be outweighed by large uncertainties or major exposures to adverse conditions.

BB. An obligation rated ‘BB’ is less vulnerable to nonpayment than other speculative issues. However, it faces major ongoing uncertainties or exposure to adverse business, financial, or economic conditions which could lead to the obligor’s inadequate capacity to meet its financial commitment on the obligation.

B. An obligation rated ‘B’ is more vulnerable to nonpayment than obligations rated ‘BB’, but the obligor currently has the capacity to meet its financial commitment on the obligation. Adverse business, financial, or economic conditions will likely impair the obligor’s capacity or willingness to meet its financial commitment on the obligation.

CCC. An obligation rated ‘CCC’ is currently vulnerable to nonpayment, and is dependent upon favorable business, financial, and economic conditions for the obligor to meet its financial commitment on the obligation. In the event of adverse business, financial, or economic conditions, the obligor is not likely to have the capacity to meet its financial commitment on the obligation.

CC. An obligation rated ‘CC’ is currently highly vulnerable to nonpayment. The ‘CC’ rating is used when a default has not yet occurred, but Standard & Poor’s expects default to be a virtual certainty, regardless of the anticipated time to default.

C. An obligation rated ‘C’ is currently highly vulnerable to nonpayment, and the obligation is expected to have lower relative seniority or lower ultimate recovery compared to obligations that are rated higher.

D. An obligation rated ‘D’ is in default or in breach of an imputed promise. The ‘D’ rating category is used when payments on an obligation are not made on the date due, unless Standard & Poor’s believes that such payments will be made within five business days in the absence of a stated grace period or within the earlier of the stated grace period or 30 calendar days. The ‘D’ rating also will be used upon the filing of a bankruptcy petition or the taking of a similar action and where default on an obligation is a virtual certainty, for example due to automatic stay provisions. An obligation’s rating is lowered to ‘D’ if it is

The ratings from ‘AA’ to ‘CCC’ may be modified by the addition of a plus (+) or minus (-) sign to show relative standing within the major rating categories.

This indicates that no rating has been requested, that there is insufficient information on which to base a rating, or that Standard & Poor’s does not rate a particular obligation as a matter of policy.

Driehaus Active Income Fund, Driehaus Select Credit Fund and Driehaus Event Driven Fund (individually, a “Fund” and collectively, the “Funds”) are each a nondiversified series of Driehaus Mutual Funds (the “Trust”), an open-end management investment company. Driehaus Capital Management LLC (“DCM” or the “Adviser”) provides management and investment advisory services to each Fund. The Trust is a Delaware statutory trust organized under an Agreement and Declaration of Trust (“Declaration of Trust”) dated May 31, 1996, as subsequently amended and restated as of June 6, 2013, and as of the date of this SAI has eight series, including the Funds. The Trust or a Fund may be terminated (i) by the affirmative vote of at least two-thirds of the outstanding shares of the Trust (or Fund) at any meeting of shareholders, or (ii) by an instrument in writing, without a meeting, signed by a majority of the Trustees and consented to by at least two-thirds of the outstanding shares, or (iii) by the Trustees by written notice to shareholders. The Trust may issue an unlimited number of shares, in one or more series or classes as its Board of Trustees (the “Board”) may authorize. The Driehaus Active Income Fund commenced operations on June 1, 2009, following the acquisition of the assets and liabilities of the Lotsoff Capital Management Active Income Fund (the “Predecessor Fund”), a nondiversified series of an open-end management investment company, Lotsoff Capital Management Investment Trust, registered under the Investment Company Act of 1940, as amended (the “1940 Act”). The Driehaus Select Credit Fund commenced operations on September 30, 2010 and the Driehaus Event Driven Fund commenced operations on August 26, 2013.

As a Delaware statutory trust, the Trust is not required to hold annual shareholder meetings. However, special meetings may be called for purposes such as electing or removing Trustees, changing fundamental policies, or approving an investment advisory contract. If requested to do so by the holders of at least 10% of the Trust’s outstanding shares, the Trust will call a special meeting for the purpose of voting upon the question of removal of a Trustee or Trustees and will assist in the communication with other shareholders as if the Trust were subject to Section 16(c) of the 1940 Act. All shares of all series of the Trust are voted together in the election of Trustees. On any other matter submitted to a vote of shareholders, shares are voted in the aggregate and not by the series, except that shares are voted by an individual series when required by the 1940 Act or other applicable law, or when the Board determines that the matter affects only the interests of one series, in which case shareholders of the unaffected series are not entitled to vote on such matters.

Forum for Adjudication of Disputes. The Trust’s Amended and Restated By-Laws (the “By-Laws”) provide that, unless the Trust consents in writing to the selection of an alternative forum, the sole and exclusive forum for (i) any derivative action or proceeding brought on behalf of the Trust, (ii) any action asserting a claim of breach of a fiduciary duty owed by any Trustee, officer or other employee of the Trust to the Trust or the Trust’s shareholders, (iii) any action asserting a claim arising pursuant to any provision of the Delaware Statutory Trust Act (the “Delaware Act”) or the Declaration of Trust or these By-Laws, (iv) any action to interpret, apply, enforce or determine the validity of the Declaration of Trust or these By-Laws or (v) any action asserting a claim governed by the internal affairs doctrine shall be either (a) the U.S. District Court for the District of Delaware or the Court of Chancery of the State of Delaware, or, if the Court of Chancery of the State of Delaware does not have jurisdiction, the Superior Court of the State of Delaware; or (b) the U.S. District Court for the District of Illinois or the Circuit Court of the State of Illinois (each, a “Covered Action”). The By-Laws further provide that if any Covered Action is filed in a court other than either (a) the U.S. District Court for the District of Delaware or the Court of Chancery of the State of Delaware or the Superior Court of the State of Delaware; or (b) the U.S. District Court for the District of Illinois or the Circuit Court of the State of Illinois (a “Foreign Action”) in the name of any shareholder, such shareholder shall be deemed to have consented to (i) the personal jurisdiction of the U.S. District Court for the District of Delaware or the Court of Chancery of the State of Delaware and the Superior Court of the State of Delaware or (ii) the U.S. District Court for the District of Illinois or the Circuit Court of the State of Illinois in connection with any action brought in any such courts to enforce the preceding sentence (an “Enforcement Action”) and (ii) having service of process made upon such shareholder in any such Enforcement Action by service upon such shareholder’s counsel in the Foreign Action as agent for such shareholder.

As with all investments, at any given time the value of your shares in a Fund may be worth more or less than the price you paid. The value of your shares depends on the value of the individual securities owned by the Fund which will go up and down depending on the performance of the issuer of the security, general market and economic conditions, and investor confidence. In addition, the market for securities generally rises and falls over time, usually in cycles. During any particular cycle, an investment style may be in or out of favor. If the market is not favoring a Fund’s style, the Fund’s gains may not be as big as, or its losses may be larger than, those of other funds using different investment styles.

The Funds invest in U.S. and non-U.S. fixed income and floating rate securities, both investment grade and non-investment grade quality, as well as in common stocks, preferred stocks, American Depositary Receipts and Global Depositary Receipts, both within and outside the U.S. The Funds are actively managed taking both long and short positions and may invest in derivatives, including for speculative purposes. In view of this, the Funds may be subject to above-average risk.

The Funds may invest in non-investment grade fixed income securities (commonly known as “junk bonds”) that are considered predominantly speculative by traditional investment standards. Non-investment grade fixed income securities and unrated securities of comparable credit quality are subject to the increased risk of an issuer’s inability to meet principal and interest payment obligations. These securities may be subject to greater price volatility due to such factors as specific corporate developments, interest rate sensitivity, negative perceptions of the junk bond markets generally and less secondary market liquidity.

The Funds may invest in corporate debt securities. Corporate debt securities include corporate bonds, debentures, notes and other similar instruments, including certain convertible securities. Debt securities may be acquired with warrants attached. Corporate income producing securities also may include forms of preferred or preference stock. The rate of interest on a corporate debt security may be fixed, floating or variable, and may vary inversely with respect to a reference rate such as interest rates or other financial indications. The Funds can invest in corporate securities of any rating or that are unrated. The rate of return or return of principal on some debt obligations may be linked or indexed to the level of exchange rates between the U.S. dollar and a foreign currency or currencies.

Variable and floating rate securities provide for a periodic adjustment in the interest rate paid on the obligations. The terms of such obligations must provide that interest rates are adjusted periodically based upon an interest rate adjustment

index as provided in the respective obligations. The adjustment intervals may be regular, and range from daily up to annually, or may be event based, such as based on a change in the prime rate.

The Funds may invest in floating rate debt instruments (“floaters”). The interest rate on a floater is a variable rate, which is tied to another interest rate, such as a money market index, like the London Interbank Offered Rate (“LIBOR”), or U.S. Treasury bill rate. The interest rate on a floater resets periodically, typically every six months. Because of the interest rate reset feature, floaters provide the Funds with a certain degree of protection against rises in interest rates, although the Funds will participate in any declines in interest rates as well.

The Funds also may invest in inverse floating rate debt instruments (“inverse floaters”). The interest rate on an inverse floater resets in the opposite direction from the market rate of interest to which the inverse floater is indexed or inversely to a multiple of the applicable index. An inverse floating rate security may exhibit greater price volatility than a fixed rate obligation of similar credit quality.

The Funds may invest in high yield, high risk, lower-rated debt securities, including convertible securities. Investments in such securities are subject to greater credit risks than higher rated securities. Debt securities rated below investment grade have greater risks of default than investment grade debt securities, including medium grade debt securities, and may in fact, be in default. Issuers of “junk bonds” must offer higher yields to compensate for the greater risk of default on the payment of principal and interest.

The market for high yield securities is subject to substantial volatility. For example, an economic downturn may have a more significant effect on high yield securities and their markets, as well as on the ability of securities issuers to repay principal and interest, than on higher rated securities and their issuers. Issuers of high yield securities may be of low creditworthiness and the high yield securities may be subordinated to the claims of senior lenders. During periods of economic downturn or rising interest rates the issuers of high yield securities may have greater potential for insolvency and a higher incidence of high yield bond defaults may be experienced.

The prices of high yield securities have been found to be less sensitive to interest rate changes than higher-rated investments but are more sensitive to adverse economic changes or individual corporate developments because of their lower credit quality. During an economic downturn or substantial period of rising interest rates, highly leveraged issuers may experience financial stress which would adversely affect their ability to service their principal and interest payment obligations, to meet projected business goals, and to obtain additional financing. If the issuer of a high yield convertible security owned by a Fund defaults, the Fund may incur additional expenses in seeking recovery. Periods of economic uncertainty and changes can be expected to result in increased volatility of market prices of high yield securities and a Fund’s net asset value. Yields on high yield securities will fluctuate over time. Furthermore, in the case of high yield securities structured as zero coupon or pay-in-kind securities, their market prices are affected to a greater extent by interest rate changes and thereby tend to be more volatile than market prices of securities which pay interest periodically and in cash.

The secondary market for high yield securities may at times become less liquid or respond to adverse publicity or investor perceptions making it more difficult for a Fund to value accurately high yield securities or dispose of them. To the extent a Fund owns or may acquire illiquid or restricted high yield securities, these securities may involve special registration responsibilities, liabilities and costs, and liquidity difficulties, and judgment will play a greater role in valuation because there is less reliable and objective data available.

Special federal income tax considerations are associated with investing in zero coupon or pay-in-kind securities. For federal income tax purposes, the Funds will report the interest on these securities as income even though they receive no cash interest until the security’s maturity or payment date. Further, each Fund must distribute substantially all of its income to its shareholders to qualify as a regulated investment company for federal income tax purposes. Accordingly, a

Fund may have to dispose of its portfolio securities under disadvantageous circumstances to generate cash or may have to borrow to satisfy distribution requirements.

Credit ratings evaluate the safety of principal and interest payments, not the market value risk of high yield securities. Since credit rating agencies may fail to timely change the credit ratings to reflect subsequent events, the Adviser monitors the issuers of high yield convertible securities in the portfolio to determine if the issuers will have sufficient cash flow and profits to meet required principal and interest payments, and to attempt to assure the securities’ liquidity so a Fund can meet redemption requests. To the extent that a Fund invests in high yield securities, the achievement of its investment objective may be more dependent on the Adviser’s own credit analysis than is the case for higher quality bonds.

The Funds may invest in convertible debt securities. The Funds may also invest in common or preferred stock as a means of realizing the economic value associated with owning convertible securities. Convertible securities are bonds or preferred stocks that may be converted (exchanged) into common stock of the issuing company within a certain period of time, for a specified number of shares. By investing in convertible debt securities, the Funds seek the opportunity, through the conversion feature, to participate in the capital appreciation of the common stock into which the securities are convertible, while investing at a better price than may be available on the common stock or obtaining a higher fixed rate of return than is available on common stocks. The market value of convertible debt securities tends to vary inversely with the level of interest rates. Although under normal market conditions longer-term debt securities have greater yields than do shorter-term debt securities of similar quality, they are subject to greater price fluctuations.

The Funds may invest in common stock across all market capitalizations. Common stock represents an equity interest in a company, which generally gives the Funds the right to vote on issues affecting the company’s organization and operations. The market values of common stock can fluctuate significantly, reflecting the business performance of the issuing company, investor perception and general economic or financial market movements. Despite the price volatility, however, common stocks have historically offered a greater potential for long-term gain on investment, compared to other classes of financial instruments, such as bonds or cash equivalents, although there can be no assurance that this will be true in the future.

The Funds may invest in preferred stock across all market capitalizations. Preferred stock is an equity security, but possesses certain attributes of debt securities. Holders of preferred stock normally have the right to receive dividends at a fixed rate when and as declared by the issuers’ board of directors, but do not otherwise participate in amounts available for distribution by the issuing corporation. Dividends on preferred stock may be cumulative, and, in such cases, all cumulative dividends usually must be paid prior to dividend payments to common stockholders. Preferred stock generally has a preference in liquidation over common stock, but is subordinated in liquidation to the company’s debt securities. As a general rule, the market value of preferred stocks with fixed dividend rates and no conversion rights moves inversely with interest rates and perceived credit risk, with the price determined by the dividend rate. Some preferred stocks are convertible into other securities (e.g. common stock) at a fixed price and ratio or upon the occurrence of certain events. The market price of convertible preferred stocks generally reflects an element of conversion value. Because many preferred stocks lack a fixed maturity date, these securities generally fluctuate substantially in value when interest rates change; such fluctuations often exceed those of long-term bonds of the same issuer. Some preferred stocks pay an adjustable dividend that may be based on an index, formula, auction procedure or other dividend rate reset mechanism. In the absence of credit deterioration, adjustable rate preferred stocks tend to have more stable market values than fixed rate preferred stocks.

The Funds may purchase shares of exchange-traded funds (“ETFs”) holding fixed income securities (“fixed income ETFs”). All ETFs are investment companies whose shares are bought and sold on a securities exchange. An ETF generally represents a portfolio of securities designed to track a particular market index. The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the index is designed to track, although lack of liquidity in a particular ETF could result in it being more volatile than the underlying portfolio of securities and trading at a discount to its net asset value. ETFs also have management fees that are part of their costs, and each Fund will indirectly bear its proportionate share of these costs.

A Fund’s investment in fixed income ETFs, subject to the exception specified in the next sentence, currently is limited to (a) 3% of the total voting stock of any one ETF, (b) 5% of a Fund’s total assets with respect to any one ETF and (c) 10% of the Fund’s total assets in the aggregate. An exception to these limitations is found in Section 12(d)(1)(F) of the 1940 Act, which provides that the above limitations do not apply to securities purchased or otherwise acquired by each Fund if (a) immediately after such purchase or acquisition not more than 3% of the total outstanding securities of such ETF is owned by the Fund and all affiliated persons of the Fund; and (b) the Fund has not offered or sold, and is not proposing to offer or sell, any security issued by it through a principal underwriter or otherwise at a public or offering price which includes a sales load of more than 1 1/2%. In any event, a Fund will not invest more than 10% of its total assets in ETFs.

The Funds invest without regard to maturity or duration limitations. As a measure of a fixed income security’s cash flow, duration is an alternative to the concept of “term to maturity” in assessing the price volatility associated with changes in interest rates. Generally, the longer the duration, the more volatility an investor should expect. For example, the market price of a bond with a duration of three years would be expected to decline 3% if interest rates rose 1%. Conversely, the market price of the same bond would be expected to increase 3% if interest rates fell 1%. The market price of a bond with a duration of six years would be expected to increase or decline twice as much as the market price of a bond with a three-year duration. Duration is a way of measuring a security’s maturity in terms of the average time required to receive the present value of all interest and principal payments as opposed to its term to maturity. The maturity of a security measures only the time until final payment is due; it does not take account of the pattern of a security’s cash flows over time, which would include how cash flow is affected by prepayments and by changes in interest rates. Incorporating a security’s yield, coupon interest payments, final maturity and option features into one measure, duration is computed by determining the weighted average maturity of a bond’s cash flows, where the present values of the cash flows serve as weights. In computing the duration of each Fund, the Adviser will estimate the duration of obligations that are subject to features such as prepayment or redemption by the issuer, put options retained by the investor or other imbedded options, taking into account the influence of interest rates on prepayments and coupon flows. For the Driehaus Active Income Fund and the Driehaus Select Credit Fund, the Adviser will adjust the duration and maturity of each Fund’s portfolio based on the Adviser’s interest rate outlook. The Driehaus Active Income Fund and the Driehaus Select Credit Fund are managed with the objective of each Fund maintaining a low duration.

The Funds may invest in a variety of U.S. Treasury obligations, including bills, notes and bonds. These obligations differ only in terms of their interest rates, maturities and time of issuance. The Funds may also invest in other securities issued or guaranteed by the U.S. government, its agencies and instrumentalities.

Obligations of certain agencies and instrumentalities, such as the Government National Mortgage Association (“Ginnie Mae”), are supported by the full faith and credit of the U.S. Treasury. Others, such as those of the Export-Import Bank of the United States, are supported by the right of the issuer to borrow from the U.S. Treasury; and others, such as those of the Federal National Mortgage Association (“Fannie Mae”), are supported by the discretionary authority of the U.S. government to purchase the agency’s obligations; still others, such as those of the Student Loan Marketing Association

(“Sallie Mae”), are supported only by the credit of the agency or instrumentality that issues them. There is no guarantee that the U.S. government will provide financial support to its agencies or instrumentalities, now or in the future, if it is not obligated to do so by law. For a discussion of the placement of Fannie Mae into conservatorship, please see the discussion below under “Mortgage-Backed Securities and Other Asset-Backed Securities.”

The Funds may invest in residential and commercial mortgage-backed securities as well as other asset-backed securities that are secured or backed by automobile loans, installment sale contracts, credit card receivables or other assets (“Asset-Backed Collateral”) and are issued by Ginnie Mae, Fannie Mae, the Federal Home Loan Mortgage Corporation (“Freddie Mac”), commercial banks, trusts, special purpose entities, finance companies, finance subsidiaries of industrial companies, savings and loan associations, mortgage banks and investment banks. Mortgage-backed securities include: (1) “Government Agency Mortgage-Backed Securities”; (2) “Privately-Issued Mortgage-Backed Securities”; and (3) collateralized mortgage obligations and multiclass pass-through securities. These securities represent interests in specific Asset-Backed Collateral in which periodic payments of interest on and/or principal of the Asset-Backed Collateral are made, thus, in effect, passing through periodic payments made by the individual borrowers on the Asset-Backed Collateral underlying those securities, net of any fees paid to the servicer, any third party credit enhancement provider or any guarantor of the securities. Mortgage-backed securities are typically issued in separate tranches that are secured by the same pool of Asset-Backed Collateral but vary with respect to risk and yield because of payment priority of one tranche over another. The Asset-Backed Collateral underlying securities purchased by a Fund may include sub-prime mortgage loans or non-traditional mortgage loans.

Non-mortgage asset-backed securities may involve certain risks that are not presented by mortgage-backed securities. These risks arise primarily from the nature of the underlying assets (namely, credit card and automobile loan receivables, as opposed to real estate mortgages). Non-mortgage asset-backed securities do not have the benefit of the same security interest in the collateral as mortgage-backed securities.

Like other fixed income securities, when interest rates rise the value of a fixed rate asset-backed security generally will decline; however, when interest rates decline, the value of a fixed rate asset-backed security that permits prepayment may not increase as much as that of other fixed income securities that do not permit prepayment without penalty. Asset-backed securities may be subject to greater risk of default during periods of economic downturn than other short-term instruments. With respect to mortgage-backed securities, the risk of such defaults is generally higher in the case of mortgage pools that include so-called “sub-prime” mortgages. While the secondary market for asset-backed securities is ordinarily quite liquid, during an economic downturn or when the underlying mortgage rates are being reset, the secondary market may not be as liquid as the market for other types of securities, which could cause the Funds to experience difficulty in valuing or liquidating (or both) such securities.

On September 7, 2008, the U.S. Treasury announced a federal takeover of Fannie Mae and Freddie Mac, placing the two federal instrumentalities in conservatorship. Under the takeover, the U.S. Treasury agreed to acquire senior preferred stock of each instrumentality and obtained warrants for the purchase of common stock of each instrumentality. The U.S. Treasury also pledged to make additional capital contributions as needed to help ensure that the instrumentalities maintain a positive net worth and meet their financial obligations, preventing mandatory triggering of receivership. Fannie Mae and Freddie Mac continue to rely on the support of the U.S. Treasury to continue operations, and it is not known when the conservatorships will be terminated or what changes will be made to their operations following the conservatorships.

With the increased use of technologies such as the Internet and the use of electronic data, each Fund and its third-party service providers are susceptible to operational and information security risks. In general, cyber incidents can result from deliberate attacks or unintentional events. Cyber attacks include, but are not limited to, gaining unauthorized access to digital systems for purposes of misappropriating assets or sensitive information, corrupting data, or causing operational disruption. Cyber attacks may also be carried out in a manner that does not require gaining unauthorized access, such as causing denial-of-service attacks on websites. Cyber security failures or breaches of a Fund’s third-party service provider (including, but not limited to, the Adviser, administrator, custodian and transfer agent) or the issuers of securities in which the Fund invests, have the ability to cause disruptions and impact business operations, potentially resulting in financial losses, the inability of Fund shareholders to transact business, violations of applicable privacy and other laws, regulatory fines, penalties, reputational damage, reimbursement or other compensation costs, and/or additional compliance costs. In addition, substantial costs may be incurred in order to prevent any cyber incidents in the future. Each Fund and its shareholders could be negatively impacted as a result. Although each Fund and its third-party service providers have business continuity plans and other safeguards in place, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified.

Mortgage-backed securities include Government Agency Mortgage-Backed Securities, which represent participation interests in pools of residential mortgage loans originated by United States governmental or private lenders and guaranteed, to the extent provided in such securities, by the United States government or one of its agencies or instrumentalities. Such securities, with the exception of collateralized mortgage obligations, are ownership interests in the underlying mortgage loans and provide for monthly payments that are a “pass-through” of the monthly interest and principal payments (including any prepayments) made by the individual borrowers on the pooled mortgage loans, net of any fees paid to the guarantor of such securities and the servicer of the underlying mortgage loans.

The Government Agency Mortgage-Backed Securities in which the Funds may invest will include those issued or guaranteed by Ginnie Mae, Fannie Mae and Freddie Mac. As more fully described below, these securities may include collateralized mortgage obligations, multiclass pass-through securities and stripped mortgage-backed securities.

Ginnie Mae Certificates. Ginnie Mae is a wholly-owned corporate instrumentality of the United States within the Department of Housing and Urban Development. The National Housing Act of 1934, as amended (the “Housing Act”), authorizes Ginnie Mae to guarantee the timely payment of the principal of and interest on certificates that are based on and backed by a pool of mortgage loans insured by the Federal Housing Administration Act, or Title V of the Housing Act of 1949, or guaranteed by the Veterans’ Administration under the Servicemen’s Readjustment Act of 1944, as amended, or by pools of other eligible mortgage loans. The Housing Act provides that the full faith and credit of the United States government is pledged to the payment of all amounts that may be required to be paid under any guarantee. To meet its obligations under such guarantee, Ginnie Mae is authorized to borrow from the U.S. Treasury with no limitations as to amount.

Fannie Mae Certificates. Fannie Mae is a federally chartered and privately owned corporation organized and existing under the Federal National Mortgage Association Charter Act. Fannie Mae was originally established in 1938 as a United States government agency to provide supplemental liquidity to the mortgage market and was transformed into a

shareholder owned and privately managed corporation by legislation enacted in 1968. Fannie Mae provides funds to the mortgage market primarily by purchasing home mortgage loans from local lenders, thereby replenishing their funds for additional lending. Fannie Mae acquires funds to purchase home mortgage loans from many capital market investors that ordinarily may not invest in mortgage loans directly, thereby expanding the total amount of funds available for housing.

Each Fannie Mae Certificate entitles the registered holder thereof to receive amounts representing such holder’s pro rata interest in scheduled principal payments and interest payments (at such Fannie Mae Certificate’s pass-through rate, which is net of any servicing and guarantee fees on the underlying mortgage loans), and any principal prepayments, on the mortgage loans in the pool represented by such Fannie Mae Certificate and such holder’s proportionate interest in the full principal amount of any foreclosed or otherwise finally liquidated mortgage loan. The full and timely payment of principal of and interest on each Fannie Mae Certificate will be guaranteed by Fannie Mae, which guarantee is not backed by the full faith and credit of the United States government. For a discussion of the placement of Fannie Mae into conservatorship, please see the discussion above under “Mortgage-Backed Securities and Other Asset-Backed Securities.”

Freddie Mac Certificates. Freddie Mac is a corporate instrumentality of the United States created pursuant to the Emergency Home Finance Act of 1970, as amended. Freddie Mac was established primarily for the purpose of increasing the availability of mortgage credit for the financing of needed housing. The principal activity of Freddie Mac currently consists of the purchase of first lien, conventional, residential mortgage loans and participation interests in such mortgage loans and the resale of the mortgage loans so purchased in the form of mortgage securities, primarily Freddie Mac Certificates.

Freddie Mac guarantees to each registered holder of a Freddie Mac Certificate the timely payment of interest at the rate provided for by such Freddie Mac Certificate, whether or not received. Freddie Mac also guarantees to each registered holder of a Freddie Mac Certificate ultimate collection of all principal of the related mortgage loans, without any offset or deduction, but, generally, does not guarantee the timely payment of scheduled principal. Freddie Mac may remit the amount due on account of its guarantee of collection of principal at any time after default on an underlying mortgage loan, but not later than 30 days following (i) foreclosure sale, (ii) payment of claim by any mortgage insurer, or (iii) the expiration of any right of redemption, whichever occurs later, but in any event no later than one year after demand has been made upon the mortgagor for accelerated payment of principal. The obligations of Freddie Mac under its guarantee are obligations solely of Freddie Mac and are not backed by the full faith and credit of the United States government. For a discussion of the placement of Freddie Mac into conservatorship, please see the discussion above under “Mortgage-Backed Securities and Other Asset-Backed Securities.”

Privately-Issued Mortgage-Backed Securities. Privately-Issued Mortgage-Backed Securities are issued by private issuers and represent an interest in or are collateralized by (i) mortgage-backed securities issued or guaranteed by the U.S. government or one of its agencies or instrumentalities (“Privately-Issued Agency Mortgage-Backed Securities”), or (ii) whole mortgage loans or non-Agency collateralized mortgage-backed securities (“Privately-Issued Non-Agency Mortgage-Backed Securities”). These securities are structured similarly to the Ginnie Mae, Fannie Mae and Freddie Mac mortgage pass-through securities described above and are issued by originators of and investors in mortgage loans, including savings and loan associations, mortgage banks, commercial banks, investment banks and special purpose subsidiaries of the foregoing. Privately-Issued Agency Mortgage-Backed Securities usually are backed by a pool of Ginnie Mae, Fannie Mae and Freddie Mac Certificates. Privately-Issued Non-Agency Mortgage-Backed Securities usually are backed by a pool of conventional fixed rate or adjustable rate mortgage loans that are not guaranteed by an entity having the credit status of Ginnie Mae, Fannie Mae or Freddie Mac, and generally are structured with one or more types of credit enhancement. As more fully described below, these securities may include collateralized mortgage obligations and multiclass pass-through securities.

The Funds may invest in subordinated Privately-Issued Non-Agency Mortgage-Backed Securities (“Subordinated Securities”). Subordinated Securities have no governmental guarantee, and are subordinated in some manner as to the payment of principal and/or interest to the holders of more senior Privately-Issued Non-Agency Mortgage-Backed Securities. The holders of Subordinated Securities typically are compensated with a higher stated yield than are the

holders of more senior Privately-Issued Non-Agency Mortgage-Backed Securities. On the other hand, Subordinated Securities typically subject the holder to greater risk than senior Privately-Issued Non Agency Mortgage-Backed Securities and tend to be rated in a lower rating category, and frequently a substantially lower rating category, than the senior Privately-Issued Non-Agency Mortgage-Backed Securities. Subordinated Securities generally are likely to be more sensitive to changes in prepayment and interest rates and the market for such securities may be less liquid than is the case for traditional fixed income securities and senior Privately-Issued Non-Agency Mortgage-Backed Securities.

Collateralized Mortgage Obligations and Multiclass Pass-Through Securities. Mortgage-backed securities include collateralized mortgage obligations or “CMOs,” which are debt obligations collateralized by mortgage loans or mortgage pass-through securities. Typically, CMOs are collateralized by Ginnie Mae, Fannie Mae or Freddie Mac Certificates, but also may be collateralized by other mortgage-backed securities or whole loans (such collateral collectively hereinafter referred to as “Mortgage Assets”). CMOs include multiclass pass-through securities, which can be equity interests in a trust composed of mortgage assets. Payments of principal of and interest on the Mortgage Assets, and any reinvestment income thereon, provide the funds to pay debt service on the CMOs or make scheduled distributions on the multiclass pass-through securities. CMOs may be issued by agencies or instrumentalities of the U.S. government, or by private originators of, or investors in, mortgage loans, including savings and loan associations, mortgage banks, commercial banks, investment banks and special purpose subsidiaries of the foregoing. The issuer of a series of CMOs may elect to be treated as a real estate mortgage investment conduit for federal income tax purposes.

In a CMO, a series of bonds or certificates is issued in multiple classes. Each class of CMOs, often referred to as a “tranche,” is issued at a specific fixed or floating coupon rate and has a stated maturity or final distribution date. Principal prepayments on the Mortgage Assets may cause the CMOs to be retired substantially earlier than their stated maturities or final distribution dates. Interest is paid or accrues on classes of the CMOs on a monthly, quarterly or semiannual basis. The principal of and interest on the Mortgage Assets may be allocated among the several classes of a CMO series in innumerable ways, some of which bear substantially more risk than others. In particular, certain classes of CMOs and other types of mortgage pass-through securities, including interest only classes, principal only classes, inverse floaters, or accrual classes and companion classes, are designed to be highly sensitive to changes in prepayment and interest rates and can subject the holder to extreme reductions of yield and loss of principal. Each Fund may invest in such high-risk, derivative mortgage-backed securities.

Stripped Mortgage-Backed Securities. The Funds may invest in stripped mortgage-backed securities issued by the U.S. government (“SMBS”). SMBS are usually structured with two classes that receive different proportions of the interest and principal distributions from a pool of Mortgage Assets. A common type of SMBS will have one class receiving all of the interest from the Mortgage Assets, while the other class will receive all of the principal. However, in some instances, one class will receive some of the interest and most of the principal while the other class will receive most of the interest and the remainder of the principal. If the underlying Mortgage Assets experience greater than anticipated prepayments of principal, the Funds may fail to fully recover its initial investment in these securities. The market value of the class consisting entirely of principal payments generally is unusually volatile in response to changes in interest rates. The yield on a class of SMBS that receives all or most of the interest from Mortgage Assets are generally higher than prevailing market yields on other mortgage-backed securities because their cash flow patterns are more volatile and there is a greater risk that the initial investment will not be fully recouped.

Adjustable-Rate Mortgage Loans. Certain mortgage loans underlying the mortgage-backed securities in which the Funds may invest will be adjustable rate mortgage loans (“ARMs”). ARMs eligible for inclusion in a mortgage pool will generally provide for a fixed initial mortgage interest rate for a specified period of time. Thereafter, the interest rates (the “Mortgage Interest Rates”) may be subject to periodic adjustment based on changes in the applicable index rate (the “Index Rate”). The adjusted rate would be equal to the Index Rate plus a gross margin, which is a fixed percentage spread over the Index Rate established for each ARM at the time of its origination.

There are various types of indices which provide the basis for rate adjustments on ARMs. Commonly utilized indices include the one-year, three-year and five-year constant maturity Treasury rates, the three-month Treasury Bill rate, the

180-day Treasury Bill rate, rates on longer-term Treasury securities, the 11^th District Federal Home Loan Bank Cost of Funds, the National Median Cost of Funds, the one-month, three-month, six-month or one year LIBOR, the prime rate of a specific bank, or commercial paper rates. Some indices, such as the one-year constant maturity Treasury rate, closely mirror changes in market interest rate levels. Others, such as the 11^th District Federal Home Loan Bank Cost of Funds index, tend to lag behind changes in market rate levels and tend to be somewhat less volatile. The degree of volatility in the market value of the Funds’ portfolios and therefore in the NAV of the Funds’ shares will be affected by the length of the interest rate reset periods and the degree of volatility in the applicable indices.

Adjustable interest rates can cause payment increases that some mortgagors may find difficult to make. However, certain ARMs may provide that the Mortgage Interest Rate may not be adjusted to a rate above an applicable lifetime maximum rate or below an applicable lifetime minimum rate for such ARMs. Certain ARMs may also be subject to limitations on the maximum amount by which the Mortgage Interest Rate may adjust for any single adjustment period (the “Maximum Adjustment”). Other ARMs (“Negatively Amortizing ARMs”) may provide instead or as well for limitations on changes in the monthly payment on such ARMs. Limitations on monthly payments can result in monthly payments which are greater or less than the amount necessary to amortize a Negatively Amortizing ARM by its maturity at the Mortgage Interest Rate in effect in any particular month. In the event that a monthly payment is not sufficient to pay the interest accruing on a Negatively Amortizing ARM, any such excess interest is added to the principal balance of the loan, causing negative amortization, and is repaid through future monthly payments. It may take borrowers under Negatively Amortizing ARMs longer periods of time to achieve equity and may increase the likelihood of default by such borrowers. In the event that a monthly payment exceeds the sum of the interest accrued at the applicable Mortgage Interest Rate and the principal payment which would have been necessary to amortize the outstanding principal balance over the remaining term of the loan, the excess (or “accelerated amortization”) further reduces the principal balance of the ARM. Negatively Amortizing ARMs do not provide for the extension of their original maturity to accommodate changes in their Mortgage Interest Rate. As a result, unless there is a periodic recalculation of the payment amount (which there generally is), the final payment may be substantially larger than the other payments. These limitations on periodic increases in interest rates and on changes in monthly payments protect borrowers from unlimited interest rate and payment increases.

Asset-Backed Securities. Asset-backed securities may involve certain risks that are not presented by mortgage-backed securities arising primarily from the nature of the underlying assets (namely, credit card and automobile loan receivables as opposed to real estate mortgages). Non-mortgage asset-backed securities do not have the benefit of the same security interest in the collateral as mortgage-backed securities. Credit card receivables are generally unsecured and the debtors are entitled to the protection of a number of state and federal consumer credit laws, many of which have given debtors the right to reduce the balance due on the credit cards. Most issuers of automobile receivables permit the servicers to retain possession of the underlying obligations. If the servicer were to sell these obligations to another party, there is the risk that the purchaser would acquire an interest superior to that of the holders of related automobile receivables. In addition, because of the large number of vehicles involved in a typical issuance and technical requirements under state laws, the trustee for the holders of the automobile receivables may not have an effective security interest in all of the obligations backing such receivables. Therefore, there is a possibility that payments on the receivables together with recoveries on repossessed collateral may not, in some cases, be able to support payments on these securities.

Asset-backed securities may be subject to greater risk of default during periods of economic downturn than other instruments. Also, while the secondary market for asset-backed securities is ordinarily quite liquid, in times of financial stress the secondary market may not be as liquid as the market for other types of securities, which could cause a Fund to experience difficulty in valuing or liquidating such securities.

Miscellaneous. The yield characteristics of mortgage-backed securities differ from traditional debt securities. Among the major differences are that interest and principal payments are made more frequently, usually monthly, and that principal may be prepaid at any time because the underlying mortgage loans generally may be prepaid at any time. As a result, if a Fund purchases such a security at a premium, a prepayment rate that is faster than expected will reduce yield to maturity, while a prepayment rate that is slower than expected will have the opposite effect of increasing yield to maturity. Conversely, if a Fund purchases these securities at a discount, faster than expected prepayments will increase, while

slower than expected prepayments will reduce, yield to maturity. Certain classes of CMOs and other types of mortgage pass-through securities, including those whose interest rates fluctuate based on multiples of a stated index, are designed to be highly sensitive to changes in prepayment and interest rates and can subject the holders thereof to extreme reductions of yield and possibly loss of principal.

Prepayments on a pool of mortgage loans are influenced by a variety of economic, geographic, social and other factors, including changes in the mortgagors’ housing needs, job transfers, unemployment, mortgagors’ net equity in the mortgaged properties and servicing decisions. Generally, however, prepayments on fixed rate mortgage loans will increase during a period of falling interest rates and decrease during a period of rising interest rates. Accordingly, amounts available for reinvestment by a Fund are likely to be greater during a period of declining interest rates and, as a result, likely to be reinvested at lower interest rates than during a period of rising interest rates. Mortgage-backed securities may decrease in value as a result of increases in interest rates and may benefit less than other fixed income securities from declining interest rates because of the risk of prepayment.

No assurance can be given as to the liquidity of the market for certain mortgage-backed securities, such as CMOs and multiclass pass-through securities. Determination as to the liquidity of such securities will be made in accordance with guidelines established by the Trust’s Board of Trustees. In accordance with such guidelines, the Adviser will monitor the Funds’ investments in such securities with particular regard to trading activity, availability of reliable price information and other relevant information.

The Funds may invest in Senior Loans. Senior Loans are business loans made to borrowers that may be corporations, partnerships or other entities (each a “Borrower”). These Borrowers operate in a variety of industries and across geographic regions. Senior Loans generally have the most senior position in a Borrower’s capital structure or share the senior position with other senior debt securities of the Borrower. This capital structure position generally gives holders of secured Senior Loans a priority claim on some or all of the collateral underlying the Senior Loan in the event of a default by the Borrower. The Funds may invest in both fixed and floating rate loans. Investing in Senior Loans involves investment risk and some Borrowers default on their Senior Loan repayments.

A Senior Loan is typically originated, negotiated and structured by a U.S. or foreign commercial bank, insurance company, finance company or other financial institution (the “Agent”) for a group of loan investors (“Loan Investors”). The Agent typically administers and enforces the Senior Loan on behalf of the other Loan Investors. For a secured Senior Loan, an institution, typically but not always the Agent, holds any collateral on behalf of the Loan Investors. Loan interests primarily take the form of assignments purchased in the primary or secondary market (“Assignments”). Loan interests may also take the form of participation interests in a Senior Loan (“Participations”). Senior loans primarily include senior floating rate loans and interests therein. Senior loans also include senior debt obligations that are in the form of notes rather than loan agreements and certain structured products with rates of return determined by reference to the total rate of return on one or more Senior Loans referenced in such products. Such loan interests may be acquired from U.S. or foreign commercial banks, insurance companies, finance companies or other financial institutions who have made loans or are Loan Investors or from other investors in loan interests.

The Funds typically purchase Assignments from the Agent or other Loan Investors. The purchaser of an Assignment typically succeeds to all the rights and obligations under the relevant loan agreement of the assigning Loan Investor. Under an Assignment, a Fund becomes a Loan Investor under the loan agreement with the same rights and obligations as the assigning Loan Investor. However, Assignments may be arranged through private negotiations between potential assignees and potential assignors and the rights and obligations acquired by the purchaser of an Assignment may differ from, and be more limited than, those held by the assigning Loan Investor.

Participations typically result in a Fund having a contractual relationship only with such Loan Investor, not with a Borrower. As a result, a Fund may have the right to receive payments of principal, interest and any fees to which it is

entitled only from the Loan Investor selling the Participation and only upon receipt by such Loan Investor of such payments from the Borrower. In connection with purchasing a Participation, a Fund generally will have no right to enforce compliance by the Borrower with the terms of the loan agreement, nor any rights with respect to any funds acquired by other Loan Investors through set-off against the Borrower and a Fund may not directly benefit from the collateral supporting the Senior Loan in which it purchased the Participation. As a result, a Fund may assume the credit risk of both the Borrower and the Loan Investor selling the Participation. In the event of the insolvency of the Loan Investor selling a Participation, a Fund may be treated as a general unsecured creditor of such Loan Investor. In the case of loan Participations where a bank or other lending institution serves as a financial intermediary between a Fund and the Borrower, if the Participation does not shift to the Fund the direct debtor-creditor relationship with the Borrower, the Fund may be required, in some circumstances, to treat both the lending bank or other lending institution and the Borrower as issuers for purposes of the Fund’s investment policies. Treating a financial intermediary as an issuer of indebtedness may restrict a Fund’s ability to invest in indebtedness related to a single financial intermediary, or a group of intermediaries engaged in the same industry, even if the underlying Borrowers represent many different companies and industries.

The Adviser generally relies on its own credit analysis of Borrowers and not on the analysis prepared by rating agencies or other independent parties. There is no minimum rating or other independent evaluation of a Borrower of its securities limiting a Fund’s investments. There is no limit on the percentage of each Fund’s assets that may be invested in Senior Loans that are rated below investment grade or that are unrated but of comparable quality. Although the Adviser will use its best judgment in selecting Senior Loans, there can be no assurance that such analysis will disclose factors that may impair the quality of Borrowers and other factors. A serious deterioration in credit quality of a Borrower could cause a permanent decrease in a Fund’s net asset value.

Most of the Funds’ Senior Loan investments will be secured by specific assets of the Borrower. In order to borrow money pursuant to a Senior Loan, a Borrower will frequently, for the term of the Senior Loan, pledge collateral, including but not limited to: (1) working capital assets such as cash, accounts receivable and inventory, (2) tangible fixed assets such as buildings, equipment and real property, (3) intangible assets such as patent rights and trademarks and/or (4) security interests in shares of common and preferred stock of subsidiaries or affiliates. Collateral may sometimes include guarantees or other credit support by affiliates of the Borrower. In some cases, Senior Loans may be secured only by stock in the Borrower or its subsidiaries. The Funds may also invest in Senior Loans not secured by any collateral. Collateral securing a Senior Loan may decline in value or have no value. Such a decline, whether as a result of bankruptcy proceedings or otherwise, could cause a Senior Loan to be under-secured. In most credit agreements, there is no formal requirement to pledge additional collateral. Collateral may consist of assets that may not be readily liquidated and there is no assurance that the liquidation of such assets would satisfy a Borrower’s obligations under a Senior Loan. In the event of default by the Borrower, it is possible although unlikely, that a Fund could receive a portion of the Borrower’s collateral. If a Fund receives collateral other than cash, such collateral will be liquidated and the cash received from such liquidation will be available for investment as part of the Fund’s portfolio. Owning such collateral may impact a Fund’s ability to qualify as a regulated investment company for federal income tax purposes.

Certain Borrowers must comply with various restrictive covenants contained in a loan agreement between the Borrower and the holders of the Senior Loan. In addition to requiring scheduled payment of interest and principal, such covenants may include: (1) restrictions on dividend payments and other distributions to stockholders, (2) provisions requiring the Borrower to maintain specific minimum financial ratios, (3) limits on total debt and/or (4) provisions requiring mandatory prepayments. A breach of covenant that is not waived by the Agent of the Loan Investor directly is normally an event of acceleration whereby the Agent or Loan Investor has the right to call the outstanding Senior Loan. The typical practice of the Agent or Loan Investor in relying exclusively or primarily on reports from the Borrower may involve a risk of fraud by the Borrower. Under a Participation, the agreement between the buyer and seller may limit the rights of the holder to vote on certain changes which may be made to the loan agreements, such as waiving a breach of covenant. However, the holder of a Participation will, in almost all cases, have the right to vote on certain fundamental issues such as changes in principal amount, interest rate and payment dates.

With a typical Senior Loan, the Agent administers the terms of the loan agreement and has the right to monitor collateral. The Agent is generally responsible for the collection of principal and interest payments from the Borrower and the apportionment of these payments to the credit of all institutions that are parties to the loan agreement. The Agent is typically responsible for monitoring compliance with covenants in the loan agreement based on reports prepared by the Borrower. The Borrower compensates the Agent for providing these services under a loan agreement and such compensation may include special fees. The Funds will rely on the Agent or an intermediate participant to receive and forward to each Fund its portion of the principal and interest payments on the Senior Loan. Failure by the Agent or intermediate participant to fulfill its obligations may delay or adversely affect receipt of payment by a Fund. Unless the terms of the Participation agreement gives a Fund direct recourse against the Borrower, the Fund will rely on the Agent and the other Loan Investors to use appropriate remedies against the Borrower. If an Agent is terminated, a successor Agent would generally be appointed and the assets held by the terminated Agent should remain available to the holders of Senior Loans. However, if the assets held by the Agent on behalf of a Fund were determined to be subject to the claims of the Agent’s general creditors, the Fund might incur certain costs and delays in payment on a Senior Loan or suffer a loss of principal and/or interest. Similar risks might arise in situations involving intermediate participants.

In the process of buying, selling and holding Senior Loans, a Fund may pay and may receive various fees and commissions including but not limited to facility fees, commitment fees, letter of credit fees, amendment fees and prepayment penalty fees. These fees are in addition to interest payments received.

Senior Loans can require, in addition to scheduled payments of interest and principal, the prepayment of the Senior Loan based on certain events. The degree to which Borrowers prepay Senior Loans may be affected by, among other things, the general business conditions, the financial condition of the Borrower and competitive conditions among Loan investors. Therefore, prepayments cannot be predicted with accuracy. Upon a prepayment, either in part or in full, the actual outstanding debt on which a Fund derives interest income will be reduced. A Fund may receive both a prepayment penalty fee from the Borrower and a facility fee if the Fund elects to purchase a new Senior Loan with the proceeds from the prepayment of the former.

The Funds may purchase and retain a Senior Loan where the Borrower has experienced or may likely experience credit problems including involvement in or emergence from bankruptcy reorganization proceedings or other forms of debt restructuring. Such investments may provide opportunities for enhanced income as well as capital appreciation. In such situations, a Fund may determine or be required to accept equity securities or junior debt in exchange for all or a portion of a Senior Loan.

When a Fund has an interest in certain Senior Loans (for example, in a revolving line of credit), the Fund may have an obligation to make additional loans upon demand by the Borrower. These commitments may have the effect of requiring a Fund to increase its investment in a Borrower at a time when it would not have otherwise done so. The Funds intend to reserve against such contingent obligations by segregating sufficient assets in high quality short-term liquid investments to cover such obligations.

Lenders can be sued by other creditors and shareholders. Losses could be greater than the original loan amount and occur years after the loan’s recovery. If a Borrower becomes involved in bankruptcy proceedings, a court may invalidate a Fund’s security interest in the loan collateral or subordinate a Fund’s rights under the Senior Loan to the interests of the Borrower’s unsecured creditors or cause interest previously paid to be refunded to the Borrower. If a court required interest to be refunded, it could negatively impact the Fund’s performance. Such action by the court could be based, for example, on a “fraudulent conveyance” claim or failure to perfect a security interest in loan collateral. If a Fund’s security interest in loan collateral is invalidated or the Senior Loan is subordinated to other debt of the Borrower in bankruptcy or other proceedings, the Fund would have substantially lower recovery, and perhaps no recovery, on the full amount of the principal and interest due on the Senior Loan, or the Fund could also have to refund interest.

Participations and Assignments involve credit risk, interest rate risk and liquidity risk as well as the potential liability associated with being a lender. If a Fund purchases a Participation, it may only be able to enforce its rights through the

participating Loan Investor and may assume the credit risk of both the Loan Investor and Borrower. Senior Loans generally are not listed on any national securities exchange or automated quotation system and a less active trading market exists for some Senior Loans. As a result, some Senior Loans are illiquid, meaning that a Fund may not be able to sell them quickly at a fair price. Illiquid securities are difficult to value. The market for illiquid securities is more volatile than the market for liquid securities. However, many Senior Loans are of a large principal amount and are held by a large number of owners. In the Adviser’s opinion, this should enhance their liquidity. In addition, in recent years the number of institutional investors purchasing Senior Loans has increased. To the extent that a secondary market does exist for certain Senior Loans, the market may be subject to irregular trading activity, wide bid/ask spreads and extended trade settlement periods. Other than certain restrictions on the amount of illiquid securities that can be held by a Fund, each Fund has no other limitation on the amount of Senior Loans it may hold. If a substantial portion of a Fund’s assets are invested in Senior Loans, it may restrict the ability of the Fund to dispose of its investments in a timely fashion and at a fair price and could result in capital losses to the Fund and its shareholders. The market for Senior Loans could be disrupted in the event of an economic downturn or a substantial increase or decrease in interest rates. This could result in increased volatility in the market and in the Fund’s net asset value per share.

If legislation or state or federal regulators impose additional requirements or restrictions on the ability of financial institutions to make loans that are considered highly leveraged transactions, the availability of Senior Loans for investment by a Fund may be adversely affected. In addition, such requirements or restrictions could reduce or eliminate sources of financing for certain Borrowers. This would increase the risk of default. If legislation or federal or state regulators require financial institutions to dispose of Senior Loans that are considered highly leveraged transactions or subject them to increased regulatory scrutiny, financial institutions may determine to sell such Senior Loans. Such sales by affected financial institutions may not be at desirable prices, in the opinion of the Adviser. If a Fund attempts to sell a Senior Loan at a time when a financial institution is engaging in such a sale, the price the Fund could get for the Senior Loan may be adversely affected.

From time to time, the Funds may use derivatives as a substitute for taking a position in an underlying security, for speculation (taking a position in the hope of increasing returns), to manage interest rate risk, or as part of a hedging strategy (attempting to reduce risk by offsetting one investment position with another). A derivative is a financial instrument which has a value that is based on - or “derived from” - the values of other assets, reference rates, or indexes. These derivative transactions will involve forward contracts, futures contracts, options and swaps, including options on futures and swaps. The use of derivative instruments for both hedging and speculative purposes involves a risk of loss or depreciation possibly greater than that associated with investing directly in the underlying assets.

Derivatives may relate to a wide variety of underlying references, such as commodities, stocks, bonds, interest rates, currency exchange rates and related indexes. Derivatives include futures contracts and options on futures contracts (see discussion below), forward-commitment transactions (see discussion below on “When-Issued and Delayed-Delivery Securities”), options on securities (see discussion below on “Options on Securities”), caps, floors, collars, swap agreements (see discussion below on “Swaps”), and other financial instruments. Some derivatives, such as futures contracts and certain options, are traded on U.S. commodity and securities exchanges, while other derivatives, such as swap agreements, are privately negotiated and entered into in the over-the-counter (“OTC”) market. The risks associated with the use of derivatives are different from, or possibly greater than, the risks associated with investing directly in securities and other traditional investments. Derivatives are used by some investors for speculative purposes. Derivatives also may be used for a variety of purposes that do not constitute speculation, such as hedging, risk management, seeking to stay fully invested, seeking to reduce transaction costs, seeking to simulate an investment in equity or debt securities or other investments, seeking to add value by using derivatives to more efficiently implement portfolio positions when derivatives are favorably priced relative to equity or debt securities or other investments, and for other purposes.

Derivative products are highly specialized instruments that require investment techniques and risk analyses different from those associated with stocks, bonds, and other traditional investments. The successful use of a derivative requires an

understanding not only of the underlying instrument but also of the derivative itself, without the benefit of observing the performance of the derivative under all possible market conditions.

The use of a derivative involves the risk that a loss may be sustained as a result of the insolvency or bankruptcy of the other party to the contract (usually referred to as a “counterparty”) or the failure of the counterparty to make required payments or otherwise comply with the terms of the contract. Additionally, the use of credit derivatives can result in losses if the Adviser does not correctly evaluate the creditworthiness of the issuer on which the credit derivative is based.

Derivatives may be subject to liquidity risk, which exists when a particular derivative is difficult to purchase or sell. If a derivative transaction is particularly large or if the relevant market is illiquid (as is the case with many OTC derivatives), it may not be possible to initiate a transaction or liquidate a position at an advantageous time or price.

Derivatives may be subject to pricing or “basis” risk, which exists when a particular derivative becomes extraordinarily expensive relative to historical prices or the prices of corresponding cash market instruments. Under certain market conditions, it may not be economically feasible to initiate a transaction or liquidate a position in time to avoid a loss or take advantage of an opportunity.

Because many derivatives have a leverage or borrowing component, adverse changes in the value or level of the underlying asset, reference rate, or index can result in a loss substantially greater than the amount invested in the derivative itself. Certain derivatives have the potential for unlimited loss, regardless of the size of the initial investment. While certain derivative transactions may be considered to constitute borrowing transactions, such derivative transactions will not be considered to constitute the issuance of a “senior security”, and therefore such transactions will not be subject to the 300% continuous asset coverage requirement otherwise applicable to borrowings, if a Fund covers the transaction or segregates sufficient liquid assets in accordance with applicable requirements.

Like most other investments, derivative instruments are subject to the risk that the market value of the instrument will change in a way detrimental to a Fund’s interest. The Funds bear the risk that the Adviser will incorrectly forecast future market trends or the values of assets, reference rates, indices, or other financial or economic factors in establishing derivative positions for a Fund. If the Adviser attempts to use a derivative as a hedge against, or as a substitute for, a portfolio investment, a Fund will be exposed to the risk that the derivative will have or will develop an imperfect or no correlation with the portfolio investment. This could cause substantial losses for the Fund. While hedging strategies involving derivative instruments can reduce the risk of loss, they can also reduce the opportunity for gain or even result in losses by offsetting favorable price movements in other investments. Many derivatives, in particular OTC derivatives, are complex and often valued subjectively. Improper valuations can result in increased cash payment requirements to counterparties or a loss of value to a Fund.

It is possible that additional government regulation of various types of derivative instruments, including futures, options and swap agreements, may limit or prevent a Fund from using such instruments as part of its investment strategy, and could ultimately prevent a Fund from being able to achieve its investment objective. It is impossible to fully predict the effects of past, present or future legislation and regulation in this area, but the effects could be substantial and adverse. It is possible that legislative and regulatory activity could limit or restrict the ability of a Fund to use certain instruments as part of its investment strategy. Limits or restrictions applicable to the counterparties with which the Funds engage in derivative transactions could also prevent a Fund from using certain instruments.

There is a possibility of future regulatory changes altering, perhaps to a material extent, the nature of an investment in the Funds or the ability of a Fund to continue to implement its investment strategies. The futures, options and swaps markets are subject to comprehensive statutes, regulations, and margin requirements. In addition, the Securities and Exchange Commission (the “SEC” or the “Commission”), the CFTC and the exchanges are authorized to take extraordinary actions in the event of a market emergency, including, for example, the implementation or reduction of speculative position limits, the implementation of higher margin requirements, the establishment of daily price limits and the suspension of trading. The regulation of futures, options and swaps transactions in the U.S. is a rapidly changing area of law and is

In particular, the Dodd-Frank Act will change the way in which the U.S. financial system is supervised and regulated. Title VII of the Dodd-Frank Act sets forth a new legislative framework for OTC derivatives, including financial instruments, such as swaps, in which a Fund may invest. Title VII of the Dodd-Frank Act makes broad changes to the over-the-counter derivatives markets, grants significant new authority to the Commission and the CFTC to regulate OTC derivatives and market participants, and will require clearing and exchange trading of many OTC derivative transactions. The CFTC and the Commission finalized the definition of “swap” and “security-based swap.” These definitions became effective October 12, 2012 and provide parameters around which contracts will be subject to further regulation under the Dodd-Frank Act.

Provisions in the Dodd-Frank Act include new capital and margin requirements and the mandatory use of clearinghouse mechanisms for many OTC derivative transactions. The CFTC, the Commission and other federal regulators have been tasked with developing the rules and regulations enacting the provisions of the Dodd-Frank Act. Because there is a prescribed phase-in period during which most of the mandated rulemaking and regulations will be implemented, it is not possible at this time to gauge the exact nature and scope of the impact of the Dodd-Frank Act on the Funds. However, it is expected that swap dealers, major market participants and swap counterparties will experience new and/or additional regulations, requirements, compliance burdens and associated costs. The new law and the rules to be promulgated may negatively impact a Fund’s ability to meet its investment objective either through limits or requirements imposed on it or upon its counterparties. In particular, any new position limits imposed on a Fund or its counterparties may impact a Fund’s ability to invest in futures, options, and swaps in a manner that efficiently meets its investment objective. New requirements, even if not directly applicable to the Funds, including capital requirements and mandatory clearing, may increase the cost of a Fund’s investments and cost of doing business, which could adversely affect investors.

An option is a legal contract that gives the buyer (who then becomes the holder) the right to buy, in the case of a call, or sell, in the case of a put, a specified amount of the underlying security at the option price at any time before the option expires. The buyer of a call obtains, in exchange for a premium that is paid to the seller, or “writer,” of the call, the right to purchase the underlying security. The buyer of a put obtains the right to sell the underlying security to the writer of the put, likewise in exchange for a premium. Options have standardized terms, including the exercise price and expiration time; listed options are traded on national securities exchanges that provide a secondary market in which holders or writers can close out their positions by offsetting sales and purchases. The premium paid to a writer is not a down payment; it is a nonrefundable payment from a buyer to a seller for the rights conveyed by the option. A premium has two components: the intrinsic value and the time value. The intrinsic value represents the difference between the current price of the securities and the exercise price at which the securities will be sold pursuant to the terms of the option. The time value is the sum of money investors are willing to pay for the option in the hope that, at some time before expiration, it will increase in value because of a change in the price of the underlying security.

One risk of any put or call that is held is that the put or call is a wasting asset. If it is not sold or exercised prior to its expiration, it becomes worthless. The time value component of the premium decreases as the option approaches expiration, and the holder may lose all or a large part of the premium paid. In addition, there can be no guarantee that a liquid secondary market will exist on a given exchange, in order for an option position to be closed out. Furthermore, if trading is halted in an underlying security, the trading of options is usually halted as well. In the event that an option cannot be traded, the only alternative to the holder is to exercise the option.

Call Options on Securities. When a Fund writes a call, it receives a premium and agrees to sell the related investments to the purchaser of the call during the call period (usually not more than nine months) at a fixed exercise price (which may differ from the market price of the related investments) regardless of market price changes during the call period. If the call is exercised, a Fund foregoes any gain from an increase in the market price over the exercise price.

To terminate its obligation on a call which it has written, a Fund may purchase a call in a “closing purchase transaction.” A profit or loss will be realized depending on the amount of option transaction costs and whether the premium previously received is more or less than the price of the call purchased. A profit may also be realized if the call lapses unexercised, because a Fund retains the premium received. All call options written by a Fund must be “covered.” For a call to be “covered”: (a) a Fund must own the underlying security or have an absolute and immediate right to acquire that security without payment of additional cash consideration; (b) a Fund must maintain cash or liquid securities adequate to purchase the security; or (c) any combination of (a) or (b).

When a Fund buys a call, it pays a premium and has the right to buy the related investments from the seller of the call during the call period at a fixed exercise price. The Fund benefits only if the market price of the related investment is above the call price plus the premium paid during the call period and the call is either exercised or sold at a profit. If the call is not exercised or sold (whether or not at a profit), it will become worthless at its expiration date, and the Fund will lose its premium payment and the right to purchase the related investment.

Put Options on Securities. When a Fund buys a put, it pays a premium and has the right to sell the related investment to the seller of the put during the put period (usually not more than nine months) at a fixed exercise price. Buying a protective put permits a Fund to protect itself during the put period against a decline in the value of the related investment below the exercise price by having the right to sell the investment through the exercise of the put.

When a Fund writes a put option it receives a premium and has the same obligations to a purchaser of such a put as are indicated above as its rights when it purchases such a put. A profit or loss will be realized depending on the amount of option transaction costs and whether the premium previously received is more or less than the put purchased in a closing purchase transaction. A profit may also be realized if the put lapses unexercised, because a Fund retains the premium received. All put options written by a Fund must be “covered.” For a put to be “covered”, a Fund must maintain cash or liquid securities equal to the option price.

The Funds may purchase and write (sell) futures contracts, and may purchase put and call options and write call options on futures contracts. A futures contract obligates the seller to deliver (and the purchaser to take delivery of) the specified commodity on the expiration date of the contract. A futures contract obligates a Fund to purchase or sell an amount of a specific debt security at a future date at a specific price. It is the practice of holders of futures contracts to close out their positions on or before the expiration date by use of offsetting contract positions and physical delivery is thereby avoided.

A futures contract is a commitment to buy or sell a specific product at a currently determined market price, for delivery at a predetermined future date. The futures contract is uniform as to quantity, quality and delivery time for a specified underlying product. The commitment is executed in a designated contract market - a futures exchange - that maintains facilities for continuous trading. The buyer and seller of the futures contract are both required to make a deposit of cash or U.S. Treasury Bills with their brokers equal to a varying specified percentage of the contract amount; the deposit is known as initial margin. Since ownership of the underlying product is not being transferred, the margin deposit is not a down payment; it is a security deposit to protect against nonperformance of the contract. No credit is being extended, and no interest expense accrues on the non-margined value of the contract. The contract is marked to market every day, and the profits and losses resulting from the daily change are reflected in the accounts of the buyer and seller of the contract. A profit in excess of the initial deposit can be withdrawn, but a loss may require an additional payment, known as variation margin, if the loss causes the equity in the account to fall below an established maintenance level. A Fund will maintain cash or liquid securities sufficient to cover its obligations under each futures contract into which it enters.

Successful use of futures contracts and options on futures contracts by a Fund is subject to the Adviser’s ability to predict correctly movements in the direction of the relevant market and, to the extent the transaction is entered into for hedging purposes, to ascertain the appropriate correlation between the transaction being hedged and the price movements of the

futures contract. For example, if a Fund uses futures to hedge against the possibility of a decline in the market value of debt instruments held in its portfolio and the prices of such securities instead increase, the Fund will lose part or all of the benefit of the increased value of the securities which it has hedged because it will have offsetting losses in its futures positions. Furthermore, if in such circumstances a Fund has insufficient cash, it may have to sell securities to meet daily variation margin requirements. A Fund may have to sell such securities at a time when it may be disadvantageous to do so.

When a Fund purchases a put or call option on a futures contract, the Fund pays a premium for the right to sell or purchase the underlying futures contract for a specified price upon exercise at any time during the option period. By writing a call option on a futures contract, a Fund receives a premium in return for granting to the purchaser of the option the right to buy from the Fund the underlying futures contract for a specified price upon exercise at any time during the option period.

Some futures and options strategies tend to hedge a Fund’s positions against price fluctuations, while other strategies tend to increase market exposure. The extent of a Fund’s loss from an unhedged short position in futures contracts or call options on futures contracts is potentially unlimited. A Fund may engage in related closing transactions with respect to options on futures contracts.

A notice of eligibility for exclusion from the definition of the term “commodity pool operator” has been filed with the National Futures Association with respect to each Fund. The Funds intend to limit their use of futures and options on futures or commodities or engage in swap transactions so as to remain eligible for the exclusion. If a Fund were no longer able to claim the exclusion, the Adviser would be required to register as a “commodity pool operator,” and the Adviser would be subject to regulation under the Commodity Exchange Act as a registrant.

When a Fund purchases or sells a futures contract, the Fund “covers” its position. To cover its position, a Fund may maintain with its custodian bank (and mark-to-market on a daily basis) cash or liquid securities that, when added to any amounts deposited with a futures commission merchant as margin, are equal to the market value of the futures contract or otherwise cover its position. If a Fund continues to engage in the described securities trading practices and so maintain cash or liquid securities, the maintained cash or liquid securities will function as a practical limit on the amount of leverage which the Fund may undertake and on the potential increase in the speculative character of the Fund’s outstanding portfolio securities. Additionally, such maintained cash or liquid securities will assure the availability of adequate funds to meet the obligations of a Fund arising from such investment activities.

A Fund may cover its long position in a futures contract by purchasing a put option on the same futures contract with a strike price (namely, an exercise price) as high or higher than the price of the futures contract, or, if the strike price of the put is less than the price of the futures contract, the Fund will maintain cash or liquid securities equal in value to the difference between the strike price of the put and the price of the futures contract. A Fund may also cover its long position in a futures contract by taking a short position in the instruments underlying the futures contract, or by taking positions in instruments the prices of which are expected to move relatively consistently with the futures contract. A Fund may cover its short position in a futures contract by taking a long position in the instruments underlying the futures contract, or by taking positions in instruments the prices of which are expected to move relatively consistently with the futures contract.

A Fund may cover its sale of a call option on a futures contract by taking a long position in the underlying futures contract at a price less than or equal to the strike price of the call option, or, if the long position in the underlying futures contract is established at a price greater than the strike price of the written call, the Fund will maintain cash or liquid securities equal in value to the difference between the strike price of the call and the price of the futures contract. A Fund may also cover its sale of a call option by taking positions in instruments the prices of which are expected to move relatively consistently with the call option.

Although each Fund intends to sell futures contracts only if there is an active market for such contracts, no assurance can be given that a liquid market will exist for any particular contract at any particular time. Many futures exchanges and boards of trade limit the amount of fluctuation permitted in futures contract prices during a single trading day. Once the

daily limit has been reached in a particular contract, no trades may be made that day at a price beyond that limit or trading may be suspended for specified periods during the day. Futures contract prices could move to the limit for several consecutive trading days with little or no trading, thereby preventing prompt liquidation of futures positions and potentially subjecting a Fund to substantial losses. If trading is not possible, or a Fund determines not to close a futures position in anticipation of adverse price movements, the Fund will be required to make daily cash payments of variation margin. The risk that a Fund will be unable to close out a futures position will be minimized by entering into such transactions on a national exchange with an active and liquid secondary market.

Transactions in options by each Fund will be subject to limitations established by each of the exchanges governing the maximum number of options which may be written or held by a single investor or group of investors acting in concert, regardless of whether the options are written or held on the same or different exchanges or are written or held in one or more accounts or through one or more brokers. Thus, the number of options which a Fund may write or hold may be affected by options written or held by other investment advisory clients of the Adviser and its affiliates. Position limits also apply to futures contracts. An exchange may order the liquidations of positions found to be in excess of these limits, and it may impose certain sanctions.

Participation in the options or futures markets involves investment risks and transactions costs to which a Fund would not be subject absent the use of these strategies. In particular, the loss from investing in futures contracts is potentially unlimited. If the Adviser’s prediction of movements in the securities and interest rate markets is inaccurate, a Fund could be in a worse position than if such strategies were not used.

The Funds may seek to realize additional gains through short sale transactions in securities listed on one or more national securities exchanges, or in unlisted securities. Short selling involves the sale of borrowed securities. At the time a short sale is effected, a Fund incurs an obligation to replace the security borrowed at whatever its price may be at the time the Fund purchases it for delivery to the lender. The price at such time may be more or less than the price at which the security was sold by a Fund. Until the security is replaced, a Fund is required to pay the lender amounts equal to any dividend or interest which accrue during the period of the loan. To borrow the security, a Fund also may be required to pay a premium, which would increase the cost of the security sold. The proceeds of the short sale will be retained by the broker, to the extent necessary to meet margin requirements, until the short position is closed.

Short sales involve the risk that a Fund will incur a loss by subsequently buying a security at a higher price than the price at which the Fund previously sold the security short. Any loss will be increased by the amount of compensation, interest or dividends, and transaction costs a Fund must pay to a lender of the security. In addition, because a Fund’s loss on a short sale stems from increases in the value of the security sold short, the extent of such loss, like the price of the security sold short, is theoretically unlimited. By contrast, a Fund’s loss on a long position arises from decreases in the value of the security held by the Fund and therefore is limited by the fact that the security’s value cannot drop below zero. The use of short sales, in effect, leverages a Fund’s portfolio, which could increase the Fund’s exposure to the market, magnify losses and increase the volatility of returns.

There is the risk that the counterparty to a short sale may fail to honor its contractual terms, causing a loss to a Fund. The SEC and other (including non-U.S.) regulatory authorities have imposed, and may in the future impose, restrictions on short selling, either on a temporary or permanent basis, which may include placing limitations on specific companies and/or industries with respect to which a Fund may enter into short positions. Any such restrictions may hinder a Fund in, or prevent it from, fully implementing its investment strategies and may negatively affect performance.

Until a Fund closes its short position or replaces the borrowed security, the Fund will: (a) maintain cash or liquid securities at such a level that the amount deposited in the account plus the amount deposited with the broker as collateral will equal the current value of the security sold short; or (b) otherwise cover the Fund’s short position. These requirements limit a Fund’s leveraging of its investments and the related risk of losses from leveraging.

A swap agreement is a derivative that is subject to the risks discussed above in “Derivatives.” A swap agreement is an agreement between two parties (counterparties) to exchange payments at specified dates (periodic payment dates) on the basis of a specified amount (notional amount) with the payments calculated with reference to a specified asset, reference rate, or index.

Examples of swap agreements include, but are not limited to, interest rate swaps, credit default swaps, equity swaps, commodity swaps, foreign currency swaps, index swaps, and total return swaps. Forms of swap agreements include interest rate caps, under which, in return for a premium, one party agrees to make payments to the other to the extent interest rates exceed a specified rate or “cap”; interest rate floors, under which, in return for a premium, one party agrees to make payments to the other to the extent interest rates fall below a specified level or “floor”; and interest rate collars, under which a party sells a cap and purchases a floor or vice versa in an attempt to protect itself against interest rate movements exceeding given minimum levels. Most swap agreements provide that when the periodic payment dates for both parties are the same, payments are netted, and only the net amount is paid to the counterparty entitled to receive the net payment.

Consequently, a Fund’s current obligations (or rights) under a swap agreement will generally be equal only to the net amount to be paid or received under the agreement, based on the relative values of the positions held by each counterparty. Swap agreements allow for a wide variety of transactions. For example, fixed rate payments may be exchanged for floating rate payments; U.S. dollar-denominated payments may be exchanged for payments denominated in a different currency; and payments tied to the price of one asset, reference rate, or index may be exchanged for payments tied to the price of another asset, reference rate, or index.

An option on a swap agreement, also called a “swaption,” is an option that gives the buyer the right, but not the obligation, to enter into a swap on a future date in exchange for paying a market-based “premium.” A receiver swaption gives the owner the right to receive the total return of a specified asset, reference rate, or index. A payer swaption gives the owner the right to pay the total return of a specified asset, reference rate, or index. Swaptions also include options that allow an existing swap to be terminated or extended by one of the counterparties.

It is possible that developments in the swaps market, including government regulation, could adversely affect a Fund’s ability to terminate existing swap agreements or to realize amounts to be received under such agreements.

To ensure the availability of suitable securities for its portfolio, a Fund may purchase when-issued or delayed-delivery securities. When-issued transactions arise when securities are purchased by a Fund with payment and delivery taking place in the future in order to secure what is considered to be an advantageous price and yield to the Fund at the time of entering into the transaction.

When-issued securities represent securities that have been authorized but not yet issued. A Fund may also purchase securities on a forward commitment or delayed-delivery basis. In a forward commitment transaction, a Fund contracts to purchase securities for a fixed price at a future date beyond customary settlement time. A Fund is required to hold and maintain until the settlement date, cash or other liquid assets in an amount sufficient to meet the purchase price. Alternatively, a Fund may enter into offsetting contracts for the forward sale of other securities that it owns. The purchase of securities on a when-issued or forward commitment basis involves a risk of loss if the value of the security to be purchased declines prior to the settlement date.

The Funds may enter into mortgage “dollar rolls” in which a Fund sells mortgage-backed securities for delivery in the current month and simultaneously contracts to repurchase substantially similar (same type, coupon and maturity) securities on a specified future date. During the roll period, a Fund foregoes principal and interest paid on the mortgage-backed securities.

A Fund is compensated by the difference between the current sales price and the lower forward price for the future purchase (often referred to as the “drop”) as well as by the interest earned on the cash proceeds of the initial sale. A “covered roll” is a dollar roll for which there is an offsetting cash or liquid security position. A Fund will only enter into covered rolls. Covered rolls are not treated as a borrowing or other senior security and will be excluded from the calculation of a Fund’s borrowings and other senior securities.

The Funds may engage in foreign currency transactions on a spot (cash) basis at the spot rate prevailing in the foreign currency exchange market or through entering into contracts to purchase or sell foreign currencies at a future date (“forward foreign currency” contracts or “forward” contracts). A Fund may enter into foreign currency transactions for any purpose consistent with the Fund’s investment objective.

A forward foreign currency contract involves an obligation to purchase or sell a specific currency at a future date, which may be any fixed number of days from the date of the contract agreed upon by the parties, at a price set at the time of the contract. These contracts are principally traded in the inter-bank market conducted directly between currency traders (usually large commercial banks) and their customers.

A forward contract generally has no deposit requirement and no commissions are charged at any stage for trades. Although a Fund values its assets daily in terms of U.S. dollars, it does not intend to convert its holdings of foreign currencies into U.S. dollars on a daily basis. A Fund will do so from time to time and investors should be aware of the costs of currency conversion. Although foreign exchange dealers do not charge a fee for conversion, they realize a profit based on the difference (the “spread”) between the prices at which they are buying and selling various currencies. Thus, a dealer may offer to sell a foreign currency to a Fund at one rate, while offering a lesser rate of exchange should the Fund desire to resell that currency to the dealer.

A Fund may purchase and sell currency futures and purchase and write currency options to increase or decrease its exposure to different foreign currencies. The uses and risks of currency options and futures are similar to options and futures relating to securities or indices, as discussed above. Currency futures contracts are similar to forward foreign

currency contracts, except that they are traded on exchanges (and have margin requirements) and are standardized as to contract size and delivery date. Most currency futures contracts call for payment or delivery in U.S. dollars. The underlying instrument of a currency option may be a foreign currency, which generally is purchased or delivered in exchange for U.S. dollars, or may be a futures contract. The purchaser of a currency call obtains the right to purchase the underlying currency, and the purchaser of a currency put obtains the right to sell the underlying currency.

Currency futures and options values can be expected to correlate with exchange rates, but may not reflect other factors that affect the value of a Fund’s investments. A currency hedge, for example, should protect a Yen-denominated security from a decline in the Yen, but will not protect a Fund against a price decline resulting from deterioration in the issuer’s creditworthiness. In hedging transactions, the value of a Fund’s foreign-denominated investments may change in response to many factors other than exchange rates, in which case it may not be possible to match the amount of currency options and futures to the value of the Fund’s investments exactly over time.

The Funds may invest in securities of foreign issuers. The Funds may also hold securities of U.S. and foreign issuers in the form of American Depositary Receipts (“ADRs”) or American Depositary Shares (“ADSs”), European Depositary Receipts (“EDRs”) and Global Depositary Receipts (“GDRs”) and they may each invest in securities of foreign issuers traded directly in the U.S. securities markets. Investments in foreign securities involve special risks and considerations that are not present when a Fund invests in domestic securities. As an operating policy, each Fund may invest up to 15% of its total assets in non U.S.-dollar denominated securities.

The Funds may invest in obligations issued or guaranteed by one or more foreign governments or any of their political subdivisions, agencies or instrumentalities that are determined by the Adviser to be of comparable quality to the other obligations in which a Fund may invest. Such securities also include debt obligations of supranational entities. Supranational entities include international organizations designated or supported by governmental entities to promote economic reconstruction or development and international banking institutions and related government agencies. Examples include the International Bank for Reconstruction and Development (the World Bank), the European Coal and Steel Community, the Asian Development Bank and the Inter-American Development Bank.

The value of a Fund’s foreign investments may be significantly affected by changes in currency exchange rates, and the Fund may incur certain costs in converting securities denominated in foreign currencies to U.S. dollars. In many countries, there is less publicly available information about issuers than is available in the reports and ratings published about companies in the United States. Additionally, foreign companies are not subject to uniform accounting, auditing and financial reporting standards. Dividends and interest on foreign securities may be subject to foreign withholding taxes which would reduce a Fund’s income without providing a federal income tax credit or deduction for the Fund’s shareholders, unless each Fund meets certain requirements, which they are not expected to satisfy. Although each Fund intends to invest in securities of foreign issuers domiciled in nations which the Adviser considers as having stable and friendly governments, there is a possibility of expropriation, confiscatory taxation, currency blockage or political or social instability which could affect investments in those nations.

Securities markets in emerging market countries are undergoing a period of growth and change which may result in trading volatility and difficulties in the settlement and recording of transactions, and in interpreting and applying the relevant law and regulations. The securities industry in these countries are comparatively undeveloped. Securities brokers and other intermediaries in emerging market countries may not perform as well as their counterparts in the United States and other more developed securities markets.

Emerging market countries may have relatively unstable governments and economies based on only a few industries. The value of Fund shares will likely be particularly sensitive to changes in the economies of such countries (such as reversals

of economic liberalization, political unrest or changes in trading status). Additionally, changes in governments and economies of such countries may result in capital controls or other regulatory measures that may affect a Fund’s ability to satisfy redemptions.

The Funds may purchase securities that have been privately placed but are eligible for purchase and sale under Rule 144A under the Securities Act of 1933, as amended (the “1933 Act”). Rule 144A permits certain qualified institutional buyers, such as the Funds, to trade in privately placed securities that have not been registered for sale under the 1933 Act. The Adviser, under the supervision of the Board, will consider whether securities purchased under Rule 144A are illiquid and thus subject to the Fund’s restriction of investing no more than 15% of its net assets in illiquid securities. In determining whether a Rule 144A security is liquid or not, the Adviser will consider the trading markets for the specific security, taking into account the unregistered nature of a Rule 144A security. In addition, the Adviser will consider the (1) frequency of trades and quotes, (2) number of dealers and potential purchasers, (3) dealer undertakings to make a market, and (4) nature of the security and of marketplace trades (e.g., the time needed to dispose of the security, the method of soliciting offers, and the mechanics of transfer). The liquidity of Rule 144A securities will be monitored. Investing in Rule 144A securities could have the effect of increasing the amount of a Fund’s assets invested in illiquid securities if qualified institutional buyers are unwilling to purchase such securities.

Subject to restriction (3) under “Investment Restrictions” in this SAI, each Fund may lend its portfolio securities to broker-dealers and banks. Any such loan must be continuously secured by collateral in cash or cash equivalents maintained on a current basis in an amount at least equal to the market value of the securities loaned by that Fund. The Fund would continue to receive the equivalent of the interest or dividends paid by the issuer on the securities loaned, and would also receive an additional return that may be in the form of a fixed fee or a percentage of the collateral. The Fund would have the right to call the loan and obtain the securities loaned at any time on notice of not more than five business days. The Fund would not have the right to vote the securities during the existence of the loan, but would call the loan to permit voting of the securities if, in the Adviser’s judgment, a material event requiring a shareholder vote would otherwise occur before the loan was repaid. In the event of bankruptcy or other default of the borrower, a Fund could experience both delays in liquidating the loan collateral or recovering the loaned securities and losses, including (a) possible decline in the value of the collateral or in the value of the securities loaned during the period while the Fund seeks to enforce its rights thereto, (b) possible subnormal levels of income and lack of access to income during this period, and (c) expenses of enforcing its rights.

The Funds may invest in cash and money market securities. Each Fund may do so to “cover” investment techniques, when taking a temporary defensive position or to have assets available to pay expenses, satisfy redemption requests or take advantage of investment opportunities. The money market securities in which a Fund invests include U.S. Treasury Bills, commercial paper, commercial paper master notes and repurchase agreements.

The Funds may invest in commercial paper or commercial paper master notes rated, at the time of purchase, A-l or A-2 by Standard & Poor’s Corporation or Prime-l or Prime-2 by Moody’s Investors Service, Inc. Commercial paper master notes are demand instruments without a fixed maturity bearing interest at rates that are fixed to known lending rates and automatically adjusted when such lending rates change.

Under a repurchase agreement, a Fund purchases a debt security and simultaneously agrees to sell the security back to the seller at a mutually agreed-upon future price and date, normally one day or a few days later. The resale price is greater than the purchase price, reflecting an agreed-upon market interest rate during the purchaser’s holding period. While the maturities of the underlying securities in repurchase transactions may be more than one year, the term of each repurchase

agreement will always be less than one year. Each Fund will enter into repurchase agreements only with member banks of the Federal Reserve System or primary dealers of U.S. government securities. The Adviser will monitor the creditworthiness of each of the firms which is a party to a repurchase agreement with each Fund. In the event of a default or bankruptcy by the seller, a Fund will liquidate those securities (whose market value, including accrued interest, must be at least equal to 100% of the dollar amount invested by the Fund in each repurchase agreement) held under the applicable repurchase agreement, which securities constitute collateral for the seller’s obligation to pay. However, liquidation could involve costs or delays and, to the extent proceeds from the sale of these securities were less than the agreed-upon repurchase price, a Fund would suffer a loss. A Fund also may experience difficulties and incur certain costs in exercising its rights to the collateral and may lose the interest the Fund expected to receive under the repurchase agreement. Repurchase agreements usually are for short periods, such as one week or less, but may be longer. It is the current policy of each Fund to treat repurchase agreements that do not mature within seven days as illiquid for the purposes of its investment policies.

The Funds may also invest in securities issued by other investment companies that invest in high quality, short-term debt securities (namely, money market instruments). In addition to the advisory fees and other expenses each Fund bears directly in connection with its own operations, as a shareholder of another investment company, a Fund would bear its pro rata portion of the other investment company’s advisory fees and other expenses, and such fees and other expenses will be borne indirectly by the Fund’s shareholders.

The Funds may purchase rights and warrants to purchase equity securities. Investments in rights and warrants are pure speculation in that they have no voting rights, pay no dividends and have no rights with respect to the assets of the corporation issuing them. Rights and warrants basically are options to purchase equity securities at a specific price valid for a specific period of time. They do not represent ownership of the securities, but only the right to buy them. Rights and warrants differ from call options in that rights and warrants are issued by the issuer of the security which may be purchased on their exercise, whereas call options may be written or issued by anyone. The prices of rights (if traded independently) and warrants do not necessarily move parallel to the prices of the underlying securities. Rights and warrants involve the risk that a Fund could lose the purchase value of the warrant if the warrant is not exercised prior to its expiration. They also involve the risk that the effective price paid for the warrant added to the subscription price of the related security may be greater than the value of the subscribed security’s market price.

A real estate investment trust (“REIT”) is a corporation, or a business trust that would otherwise be taxed for federal income tax purposes as a corporation, which meets the definitional requirements of the Internal Revenue Code of 1986, as amended (the “Code”). The Code permits a qualifying REIT to deduct dividends paid, thereby effectively eliminating corporate level federal income tax and making the REIT a pass-through vehicle for federal income tax purposes. To meet the definitional requirements of the Code, a REIT must, among other things, invest substantially all of its assets in interests in real estate (including mortgages and other REITs) or cash and government securities, derive most of its income from rents from real property or interest on loans secured by mortgages on real property, and distribute to shareholders annually a substantial portion of its otherwise taxable income.

REITs are characterized as equity REITs, mortgage REITs, and hybrid REITs. Equity REITs, which may include operating or finance companies, own real estate directly and the value of, and income earned by, the REITs depend upon the income of the underlying properties and the rental income they earn. Equity REITs also can realize capital gains (or losses) by selling properties that have appreciated (or depreciated) in value. Mortgage REITs can make construction, development or long-term mortgage loans and are sensitive to the credit quality of the borrower. Mortgage REITs derive their income from interest payments on such loans. Hybrid REITs combine the characteristics of both equity and mortgage REITs, generally by holding both ownership interests and mortgage interests in real estate. The value of securities issued by REITs are affected by tax and regulatory requirements and by perceptions of management skill. They

also are subject to heavy cash flow dependency, defaults by borrowers or tenants, self-liquidation and the possibility of failing to qualify as a REIT under the Code or to maintain exemption from the 1940 Act.

The Funds may enter into reverse repurchase agreements. Reverse repurchase agreements are considered to be borrowings under the 1940 Act, and as such are subject to the investment limitations discussed in the section entitled “Investment Restrictions.” Under a reverse repurchase agreement, a Fund sells portfolio securities and agrees to repurchase them at an agreed-upon future date and price. When a Fund enters into a reverse repurchase agreement, it will maintain cash or liquid securities having a value equal to or greater than the repurchase price (including accrued interest). Reverse repurchase agreements involve the risk that the market value of the securities sold by a Fund may decline below the price of the securities it is obligated to repurchase.

The Funds may invest in inflation-indexed bonds, which are fixed income securities whose value is periodically adjusted according to the rate of inflation. Two structures are common. The U.S. Treasury and some other issuers utilize a structure that accrues inflation into the principal value of the bond. Most other issuers pay out the inflation accruals as part of a semiannual coupon.

Inflation-indexed securities issued by the U.S. Treasury have varying maturities and pay interest on a semi-annual basis equal to a fixed percentage of the inflation-adjusted principal amount. If the periodic adjustment rate measuring inflation falls, the principal value of inflation indexed bonds will be adjusted downward, and consequently the interest payable on these securities (calculated with respect to a smaller principal amount) will be reduced. Repayment of the original bond principal upon maturity (as adjusted for inflation) is guaranteed in the case of U.S. Treasury inflation-indexed bonds, even during a period of deflation. However, the current market value of the bonds is not guaranteed and will fluctuate. The Funds also may invest in other inflation-related bonds that may or may not provide a similar guarantee. If a guarantee of principal is not provided, the adjusted principal value of the bond repaid at maturity may be less than the original principal amount.

The value of inflation-indexed bonds is expected to change in response to changes in real interest rates. Real interest rates in turn are tied to the relationship between nominal interest rates and the rate of inflation. Therefore, if the rate of inflation rises at a faster rate than nominal interest rates, real interest rates might decline, leading to an increase in value of inflation-indexed bonds. In contrast, if nominal interest rates increase at a faster rate than inflation, real interest rates might rise, leading to a decrease in value of inflation-indexed bonds. For federal income tax purposes, any increase in the principal amount of an inflation-indexed bond will be considered taxable ordinary income, even though investors do not receive their principal until maturity.

While these securities are expected to be protected from long-term inflationary trends, short-term increases in inflation may lead to a decline in value. If interest rates rise due to reasons other than inflation (for example, due to changes in currency exchange rates), investors in these securities may not be protected to the extent that the increase is not reflected in the bond’s inflation measure.

The periodic adjustment of U.S. inflation-indexed bonds is tied to the Consumer Price Index for Urban Consumers (“CPI-U”), which is calculated monthly by the U.S. Bureau of Labor Statistics. The CPI-U is a measurement of changes in the cost of living, made up of components such as housing, food, transportation and energy. Inflation-indexed bonds issued by a foreign government are generally adjusted to reflect a comparable inflation index calculated by that government. There can be no assurance that the CPI-U or any foreign inflation index will accurately measure the real rate of inflation in the prices of goods and services. Moreover, there can be no assurance that the rate of inflation in a foreign country will be correlated to the rate of inflation in the United States.

Each Fund operates under the following fundamental investment restrictions, which, together with the investment objectives and fundamental policies, cannot be changed without the approval of a “majority of the outstanding voting securities,” which is defined in the 1940 Act to mean the lesser of (i) 67% of a Fund’s shares present at a meeting where more than 50% of the outstanding shares are present in person or by proxy or (2) more than 50% of a Fund’s outstanding shares. Each Fund may not:

All swap agreements and other derivative instruments that were not classified as commodities or commodity contracts prior to July 21, 2010 are not deemed to be commodities or commodity contracts for purposes of restriction number 2 above. The deposit or payment by a Fund of initial, maintenance or variation margin in connection with all types of short sales, options and futures contract transactions is not considered to be borrowing for purposes of restriction number 4 above or the issuance of a senior security for purposes of restriction number 6 above.

Each Fund is also subject to the following nonfundamental restrictions and policies, which may be changed by the Board without shareholder approval. Each Fund may not:

For purposes of these investment restrictions, with the exception of the restriction on borrowing, subsequent changes in a Fund’s holdings as a result of changing market conditions or changes in the amount of a Fund’s total assets does not require the Fund to sell or dispose of an investment or to take any other action, except that if illiquid securities exceed 15% of a Fund’s net assets after the time of purchase, the Fund will take steps to reduce in an orderly fashion its holdings of illiquid securities. Because illiquid securities may not be readily marketable, the portfolio managers may not be able to dispose of them in a timely manner. As a result, a Fund may be forced to hold illiquid securities while their price depreciates. Depreciation in the price of illiquid securities may cause the net asset value of a Fund to decline. With respect to the investment restriction related to borrowing, a Fund may only borrow from banks and in the event that such asset coverage shall at any time fall below 33 1/3% of its total assets, the Fund shall, within three days thereafter (not including Sundays and holidays), reduce the amount of its borrowings to an extent that the asset coverage of such borrowings shall be at least 33 1/3% of its total assets.

It is the policy of the Funds, DCM and Driehaus Securities LLC (“DS LLC” or the “Distributor”) that non-public information about the Funds’ portfolio holdings (“Portfolio Holdings”) may not be selectively disclosed to any person, unless the disclosure (a) is made for a legitimate business purpose, (b) is made to a recipient who is subject to a duty to keep the information confidential, including a duty not to trade on the basis of the Funds’ Portfolio Holdings (“Authorized Recipients”), (c) is consistent with DCM’s fiduciary duties as an investment adviser, the duties owed by DS LLC as a broker-dealer to its customers or the duties owed by the Fund to its shareholders and (d) will not violate the antifraud provisions of the federal securities laws (“Disclosure Conditions”). The purpose of this policy is to prevent abusive trading in shares of the Funds, such as market timing, and not other fraudulent practices, e.g., trading on “inside information,” that are addressed in the Trust’s, DCM’s and DS LLC’s Code of Ethics.

Authorized Recipients of Portfolio Holdings information are: (a) the Trust’s officers and Trustees in their capacity as such; (b) officers, directors or employees of DCM and DS LLC who need the information to perform their duties; (c) outside counsel to the Trust, DCM or DS LLC and independent counsel to the Trust’s independent Trustees in their capacity as such; (d) the independent registered public accounting firm (the “auditors”) for the Funds, DCM or DS LLC; (e) the auditors conducting the performance verifications for DCM, DS LLC and/or their affiliates; (f) third-party broker-dealers in connection with the provision of brokerage, research or analytical services to the Trust, DCM or DS LLC; (g) third-party service providers to the Funds, DCM or DS LLC, such as the Funds’ custodian; the Funds’ administrator, fund accountant and transfer agent; DCM’s proxy-voting service; the Funds’ pricing service; and “best execution” analysts retained to evaluate the quality of executions obtained for the Funds, provided their contracts with the Funds, DCM and DS LLC contain appropriate provisions protecting the confidentiality, and limiting the use, of the information; (h) consultants and rating and ranking organizations that have entered into written confidentiality agreements with the Trust, DCM or DS LLC appropriately limiting their use of the information; and (i) such other Authorized Recipients as may be pre-approved from time to time by DCM’s Chief Executive Officer, President or General Counsel.

Authorized Recipients do not include, for example, members of the press or other communications media, institutional investors and persons that are engaged in selling shares of the Funds to customers, such as financial planners, broker-dealers or other intermediaries, unless the Disclosure Conditions are satisfied. However, the Funds, DCM or DS LLC may make disclosure of a limited number of Portfolio Holdings, provided the Funds are not disadvantaged by such disclosure and the disclosure is made for a legitimate business purpose. For example, in the normal course of business, in discussions about the Funds with current and potential institutional shareholders conducting due diligence about the Funds, the Adviser may occasionally and incidentally mention specific Portfolio Holdings that have not been previously disclosed. The Funds and the Adviser do not believe that these disclosures will disadvantage the Funds.

The Funds will post performance figures on their web site within seven business days after month-end. The Funds will

post sector weightings and portfolio characteristics on their web site within fifteen business days after month-end. The Funds will post Portfolio Holdings (full or partial holdings) on their web site 30 days after month-end. All Portfolio Holdings information is available at www.driehaus.com. Portfolio Holdings information is also available upon request after the web site posting and quarterly on Form N-Q or Form N-CSR. These filings are described below.

The Funds’ Portfolio Holdings information posted on the web site and in these filings may not represent current or future portfolio composition and are subject to change without notice. Information on particular Portfolio Holdings may be withheld if it is in a Fund’s best interest to do so.

DCM’s General Counsel is responsible for reviewing the agreements between the Trust, DCM or DS LLC and the third-party service providers, consultants, rating and ranking organizations and any pre-approved Authorized Recipients, to seek to ensure that these agreements contain appropriate confidentiality and limitations on use provisions. DCM’s Chief Compliance Officer is responsible for monitoring compliance with the Funds’ pre-approval and disclosure restrictions. The Trust’s Treasurer, Chief Legal Officer and Chief Compliance Officer, working with the Trust’s counsel, are responsible for ensuring the accuracy and completeness of the Prospectus and SAI disclosure requirements. The Trust’s Chief Compliance Officer will report to the Trust’s Board at least annually on compliance by the Funds, DCM and DS LLC with the policies and procedures on selective disclosure of the Funds’ Portfolio Holdings to enable the Board to exercise its oversight of these policies and procedures.

Equity securities, including ADRs, GDRs, EDRs and ETFs, that are traded on a stock exchange are valued at the last sale price as of the regular close of business on the NYSE (normally 3:00 p.m. Central time) on the day the securities are being valued, or lacking any sales, at the mean between the closing bid and asked prices. Securities traded on Nasdaq will be valued at the Nasdaq official closing price or at the mean between the closing bid and asked prices if there are no sales. Other over-the-counter securities are valued at the mean between the closing bid and asked prices.

Long-term fixed income securities are valued at the representative quoted bid price for such securities when held long or the representative quoted asked price if sold short or, if such prices are not available, at prices for securities of comparable maturity, quality and type or as determined by an independent pricing service, as discussed below. Debt securities with maturities of 60 days or less are valued at amortized cost. Repurchase agreements are valued at cost plus accrued interest.

U.S. government securities are traded in the over-the-counter market and are valued at the last available bid price when held long and the last available asked price when sold short. Valuations will be provided by a pricing service and may be determined based on quotations of one or more dealers that make markets in the securities as obtained from such dealers, or on the evaluation of a pricing service.

Options that are traded on exchanges are valued at their last sale price as of the close of such exchanges or, if no sales are reported, at the mean between the last reported bid and asked prices. Valuations for non-exchange traded options are provided by a pricing service or in the event such pricing service does not provide such valuations, on the basis of quotes provided by broker-dealers. Futures contracts and options thereon that are traded on exchanges are valued at their settlement price as of the close of such exchanges. Valuations for non-exchange traded futures contracts are provided by an independent pricing service or in the event that the independent pricing service does not provide such valuations, on the basis of quotes provided by broker-dealers. Swap agreements, swaptions and bank loans are valued at fair value based on the evaluation of an independent pricing service.

Trading in securities on most foreign securities exchanges and over-the-counter markets is normally completed well before the close of the NYSE except securities trading primarily on Central and South American exchanges. Such securities are valued at the last sale price as of the regular close of the relevant exchange. For securities that trade primarily on an exchange that closes after the NYSE, the price of the security will be determined at 3:00 p.m. Central time. In addition, foreign securities trading may not take place on all business days and may occur in various foreign markets on days which are not business days in domestic markets and on which net asset value is not calculated. The calculation of net asset value may not take place contemporaneously with the determination of the prices of portfolio securities used in such calculation. Events affecting the values of portfolio securities that occur between the time their prices are determined and the close of the NYSE will not be reflected in the calculation of net asset value unless the Adviser, by or under the direction of the Board, deems that the particular event would materially affect net asset value, in which case an adjustment will be made. Assets or liabilities initially expressed in terms of foreign currencies are translated prior to the next determination of the net asset value into U.S. dollars at the spot exchange rates at 3:00 p.m. Central time or at such other rates as the Adviser may determine to be appropriate in computing net asset value.

Securities and assets for which market quotations are not readily available or for which the Adviser’s Pricing Committee determines that the valuations provided using the foregoing methods do not accurately reflect current market value are valued at fair value as determined in good faith by the Adviser’s Pricing Committee under procedures established by and

under the general direction and supervision of the Board. Securities and situations in which such fair value pricing may be required include, but are not limited to: (i) illiquid securities, including “restricted” securities and private placements for which there is no public market; (ii) options not traded on a securities exchange; (iii) securities of an issuer that has entered into a restructuring; (iv) securities whose trading has been halted or suspended; (v) fixed income securities that have gone into default and for which there is not a current market value quotation; (vi) U.S. government securities and other fixed income securities when events have occurred subsequent to the close of trading for such securities and the close of the NYSE that would materially impact their value; and (vii) when the portfolio manager believes the market quotation does not reflect the fair value.

The Funds use independent pricing services approved by the Board. Unless priced at fair value in good faith by the Adviser’s Pricing Committee under procedures established by and under the general direction and supervision of the Board, prices of equity securities provided by such services represent the last sale price on the exchange where the security is primarily traded. Prices of bonds provided by such services represent evaluations of the current bid and asked market prices, may be determined without exclusive reliance on quoted prices and may reflect appropriate factors such as institution-size trading in similar groups of securities, yield, quality, coupon rate, maturity, type of issue, individual trading characteristics, indications of values from dealers and other market data. Such services may use electronic data processing techniques and/or a matrix system to determine valuations. Exchange rates of currencies provided by such services are sourced, where possible, from multi-contributor quotations. Normally, the rate will be based upon commercial interbank bid and offer quotes. Representative rates are selected for each currency based upon the latest quotation taken from contributors at short intervals prior to pricing.

The following table sets forth certain information with respect to the officers of the Trust.

The Board has general oversight responsibility with respect to the business and affairs of the Trust. The Board is responsible for overseeing the operations of the Funds in accordance with the provisions of the 1940 Act, other applicable laws and the Trust’s Declaration of Trust. The Board is composed of five Trustees who are not affiliates of the Adviser (each an “Independent Trustee” and collectively, the “Independent Trustees”) and one Interested Trustee. The Board has appointed an Independent Trustee to serve as Chairperson of the Board. Generally, the Board acts by majority vote of all of the Trustees, including a majority vote of the Independent Trustees if required by applicable law. The Trust’s day-to-day operations are managed by the Adviser and other service providers who have been approved by the Board. The Board meets periodically throughout the year to oversee the Trust’s activities, review contractual arrangements with service providers, oversee compliance with regulatory requirements, and review performance. The Board has determined that its leadership structure is appropriate given the size of the Board, the experience of each Trustee with the Trust and the number and nature of funds (including the Funds) within the Trust.

The Trustees were selected to serve and continue on the Board based upon their skills, experience, judgment, analytical ability, diligence, ability to work effectively with other Trustees and a commitment to the interests of shareholders and, with respect to the Independent Trustees, a demonstrated willingness to take an independent and questioning view of management. Each Trustee currently also has familiarity with the Funds, the Adviser and the Distributor, and their operations, as well as the special regulatory requirements governing regulated investment companies and the special responsibilities of investment company directors as a result of his or her prior service as a Trustee of the Trust or as an Advisory Board Member. In addition to those qualifications, the following is a brief summary of the specific experience, qualifications or skills that led to the conclusion, as of the date of this SAI, that each person identified below should serve as a Trustee for the Trust. References to the qualifications, attributes and skills of the Trustees are pursuant to requirements of the SEC, and do not constitute a holding out of the Board or any Trustee as having any special expertise and shall not impose any greater responsibility or liability on any such person or on the Board by reason thereof. As required by rules the SEC has adopted under the 1940 Act, the Trust’s Independent Trustees select and nominate all candidates for Independent Trustee positions.

Richard H. Driehaus. Mr. Driehaus has served as Trustee of the Trust since 1996 and served as President of the Trust from 1996 to 2011. He is Chairman of the Board and founder of the Adviser, the Distributor and USVI. In addition to his business experience as a chief executive officer, Mr. Driehaus has managed investments for over 40 years and currently serves as Chief Investment Officer of the Adviser. He serves on the Boards of Driehaus Capital Holdings LLP, Driehaus Enterprise Management, Inc., Driehaus Trust Company, LLC, The Richard H. Driehaus Foundation and The Richard H. Driehaus Museum. Mr. Driehaus’s role as Chief Investment Officer is structured to be compatible with the information barriers that apply to his investment and trading activity under the code of ethics adopted by the Adviser, the Distributor and the Trust. As the CIO, Mr. Driehaus sets the Adviser’s equity investment philosophy. However, he is prohibited on an on-going basis from engaging in stock-specific discussions with the investment personnel.

Daniel F. Zemanek. Mr. Zemanek has served as Trustee of the Trust since 1996 and as Chairperson of the Board since June 2014. From 2008 through 2014, he served as President of Ludan, Inc., a real estate services company specializing in senior housing. Mr. Zemanek has held senior management positions with various real estate development companies, including serving as Senior Vice President of Sunrise Development, Inc., a wholly owned subsidiary of Sunrise Senior Living, Inc., a NYSE company (SRZ), from 2003 to 2007. Mr. Zemanek has also served as a consultant for real estate development.

Theodore J. Beck. Mr. Beck has served as Trustee of the Trust since 2012 and served as an Advisory Board member from 2011 to 2012. He currently is President and Chief Executive Officer of National Endowment for Financial Education. From 1999 to 2005, Mr. Beck was Associate Dean for Executive Education and Corporate Relations and President for the Center for Advanced Studies in Business at the University of Wisconsin – Madison, and previously spent more than 20 years in senior management positions for Citibank/Citigroup. He also serves or has served on the Boards of the President’s Advisory Council on Financial Capability for Young Americans, President’s Advisory Council on Financial Capability, Federal Deposit Insurance Corporation Advisory Committee on Economic Inclusion and Jump$tart Coalition for Personal Financial Literacy. Mr. Beck previously served on the Boards of Wilshire Variable Insurance Trust and Wilshire Mutual Funds.

Dawn M. Vroegop. Ms. Vroegop has served as Trustee of the Trust since 2012 and served as an Advisory Board member from 2011to 2012. From 1999 to 2003, she was a Managing Director with Dresdner RCM Global Investors. She also serves on the Boards of Met Investor Series Trust, Metropolitan Series Fund, Inc. and City College of San Francisco Foundation. The Board of the Trust has determined that Ms. Vroegop is qualified as an “audit committee financial expert” as defined by the SEC.

performance of the Funds’ independent registered public accounting firm. The Audit Committee also serves to provide an open avenue of communication among the independent registered public accounting firm, Fund management and the Board. All Independent Trustees serve as members of the Audit Committee. The Audit Committee held two meetings during the Trust’s last fiscal year.

As of March 31, 2016, the Trust’s officers and Trustees as a group owned (or held a shared investment or voting power with respect to) less than 1% of the shares of the Driehaus Active Income Fund, 2.42% of the shares of the Driehaus Select Credit Fund and 1.61% of the shares of the Driehaus Event Driven Fund.

More than 75 percent of the Board members are classified under the 1940 Act as not being “interested persons” of the Trust and are often referred to as “Independent Trustees.” In addition to investing in the various other funds of the Trust, Independent Trustees may invest in limited partnerships that are managed by the Adviser and an affiliate of the Adviser. The Independent Trustees may also, from time to time, invest in other investment ventures in which affiliates and employees of the Adviser also invest.

Any expenses that are attributable solely to the organization, operation or business of a Fund shall be paid solely out of the relevant Fund’s assets. Any expenses incurred by the Trust that are not solely attributable to a particular series are apportioned in such manner as the Adviser determines is fair and appropriate, unless otherwise specified by the Board. In return for its services, the Adviser receives a monthly fee from each Fund, computed and accrued daily based on the average net assets of the relevant Fund. The annual rate for the Driehaus Active Income Fund is 0.55%, for the Driehaus Select Credit Fund is 0.80% and for the Driehaus Event Driven Fund is 1.00%. The Adviser has entered into a contractual agreement to waive a portion of its management fee and/or reimburse operating expenses to the extent necessary to cap the Driehaus Select Credit Fund’s ordinary operating expenses, excluding interest, taxes, brokerage commissions, dividends and interest on short sales, other investment-related expenses and extraordinary expenses, at 1.75% of average daily net assets for a period of three years from the Fund’s commencement of operations on September 30, 2010. Pursuant to the agreement, and so long as the investment advisory agreement is in place, for a period of three years from the Driehaus Select Credit Fund’s commencement of operations, the Adviser is entitled to reimbursement for previously waived fees and reimbursed expenses to the extent that the Fund’s ordinary annual operating expenses, excluding dividends and interest on short sales, remain below the 1.75% cap. The Adviser has entered into a contractual agreement to waive a portion of its management fee and/or reimburse operating expenses to the extent necessary to cap the Driehaus Event Driven Fund’s ordinary operating expenses, excluding interest, taxes, brokerage commissions, dividends and interest on short sales, other investment-related expenses and extraordinary expenses, at 2.00% of average daily net assets for a period of three years from the Fund’s commencement of operations on August 26, 2013. Pursuant to the agreement, and so long as the investment advisory agreement is in place, for a period of three years from the Driehaus Event Driven Fund’s commencement of operations, the Adviser is entitled to reimbursement for previously waived fees and reimbursed expenses to the extent that the Fund’s ordinary annual operating expenses, excluding dividends and interest on short sales, remain below the 2.00% cap.

The following table shows the advisory fees paid by each Fund under the advisory agreement to the Adviser and fees waived or reimbursed by the Adviser for each Fund’s last three fiscal years:

decision, there are two overriding considerations: first, the economic impact of the proposal; and second, whether it would be in the best interests of the affected Fund for the proposal to pass or not pass. The proxy voting service performs company-by-company analyses, which means that all votes are reviewed on a case-by-case basis and no issues are considered routine. Each issue is considered in the context of the company under review. The Adviser generally follows the proxy voting service’s recommendations and does not use its discretion in the proxy voting decision. For this reason, proxies are voted in a Fund’s best interests, in accordance with a predetermined policy based upon recommendations of an independent third party, and are not affected by any potential or actual conflict of interest of the Adviser.

A description of the Funds’ policies and procedures with respect to the voting of proxies relating to the Funds’ portfolio securities as well as information regarding how the Funds voted proxies during the 12-month period ended June 30^th is available without charge, upon request, by calling 1-877-779-0079. This information is also available on the Funds’ web site at www.driehaus.com and on the SEC’s web site at http://www.sec.gov.

Trade Allocation. The Adviser manages not only the Funds but other investment accounts. Simultaneous transactions may occur when the Funds and investment accounts are managed by the same investment adviser and the same security is suitable for the investment objective of more than one Fund or investment account. When two or more investment accounts are simultaneously engaged in the purchase or sale of the same security, including initial public offerings (“IPOs”), the prices and amounts are allocated in accordance with procedures, established by the Adviser, and believed to be appropriate and equitable for each investment account. In some cases, this process could have a detrimental effect on the price or value of the security as far as each Fund is concerned. In other cases, however, the ability of the Funds to participate in volume transactions may produce better executions and prices for the Funds.

Description of Compensation. The portfolio managers and assistant portfolio managers are each paid a fixed salary plus a bonus. Each receives a bonus that is calculated as a percentage of advisory fees on the Funds and any other accounts managed. In addition, for the Funds, they receive an additional percentage of advisory fees if the performance of a Fund exceeds a risk adjusted return formula. Ms. Cassidy and Mr. Sharon are also eligible for a discretionary bonus which is determined as a percentage of advisory fees of the Fund. Mr. Caldwell also receives a bonus based on a percentage of his salary, which has subjective and objective components. Mr. Schoenfeld also receives a discretionary bonus based on a percentage of his salary. If the Adviser declares a profit sharing plan contribution, the portfolio managers and assistant portfolio managers also would receive such contribution. Each is eligible to participate in an equity purchase plan available to certain key employees of the Adviser. Mr. Nelson is also a participant in a deferred compensation plan.

Other Accounts. The table below discloses other accounts for which the portfolio managers and assistant portfolio managers are primarily responsible for the day-to-day portfolio management as of December 31, 2015, unless otherwise noted.

As shown in the table above, the Funds’ portfolio managers and assistant portfolio managers, as applicable, may manage the assets of one or more Funds. Both clients and affiliated persons of the Adviser, including the portfolio managers, may own interests in these Funds. The same or related securities may be appropriate and desirable investments for any of the Funds and they may compete in the marketplace for the same investment opportunities, which may be limited. In addition, transactions by a Fund in securities held by another Fund or that another Fund is seeking to buy or sell (or transactions in related securities) may have an adverse impact on the prices that a Fund pays for those securities or can realize upon sale, or on the ability of the Adviser to buy or sell the desired amount of such securities for a Fund at favorable prices. This is particularly true when the Funds’ transactions occur at a point in time close to when trades in the same or related securities are affected for another Fund. This presents a conflict between the interests of a Fund and the interests of the other Funds as well as the affiliates of the Adviser who invest in the Funds.

Conflicts also may arise between the interests of a Fund and the interests of the Adviser and its affiliates, including the portfolio managers. These conflicts can occur as one or more of the Funds pay advisory fees to the Adviser at a higher rate than the rate of fees paid by another Fund. In addition, the Adviser’s affiliates, including the Funds’ portfolio managers, may personally own interests in the Funds or have other financial incentives (including that a portfolio manager’s compensation is based, in part, on assets under management). For example, portfolio managers could favor one Fund over another Fund when dividing their time and attention between them or when presented with limited investment opportunities that would be desirable and suitable for both a Fund and another Fund or when making trading decisions.

The Adviser, through trade allocation and other policies and procedures, seeks to manage these conflicts of interest to reduce any adverse effects on the Funds. These policies and procedures include requirements that transactions by a Fund in the same securities that occur on the same day are average priced when feasible and allocated on a fair and equitable basis. In addition, the Adviser conducts periodic reviews of transactions in and holdings of the same or related securities by a Fund for compliance with the Adviser’s policies and procedures.

Securities Ownership. The following table sets forth the dollar range of equity securities beneficially owned by the portfolio managers and the assistant portfolio managers in the Funds as of December 31, 2015:

In addition to the amounts disclosed in the table above, Mr. Nelson participates in a deferred compensation plan in which he earns an investment return based on a hypothetical investment in various funds that he elects, which may include the Funds that he manages. The following table sets forth the dollar range of Mr. Nelson’s deferred compensation plan account as of December 31, 2015 that is earning an investment return based on a hypothetical investment in the Funds that he manages:

As agent, DS LLC will offer shares of the Funds on a continuous basis to investors in states where the shares are qualified for sale, at net asset value, without sales commissions or other sales load to the investor. In addition, no sales commission or “12b-1 fees” are paid by the Funds. As principal underwriter to the Trust, DS LLC enters into arrangements with selected dealers or other third parties for the sale and redemption of Fund shares and makes payments to such entities for distribution services as well as shareholder and administrative services to customers who purchase Fund shares, including sub-accounting and sub-transfer agency services. DS LLC will offer the Funds’ shares only on a best-efforts basis.

UMB Fund Services, Inc. (“UMBFS”), with offices at 235 West Galena Street, Milwaukee, Wisconsin 53212, is the administrator and fund accountant for the Funds. The asset-based fee for administration and accounting services for each Fund is calculated as follows:

UMBFS is also the Funds’ transfer agent, registrar, dividend-disbursing agent and shareholder servicing agent. As such, UMBFS provides certain bookkeeping and data processing services and services pertaining to the maintenance of shareholder accounts.

Each Fund has adopted a Shareholder Services Plan that authorizes the Fund to make payments for services provided on behalf of the Fund. Payments may be made to banks, other institutions and service professionals (including investment advisers and broker-dealers) and other entities for certain services to investors in the Fund. Such services may include, but shall not be limited to: transfer agent and sub-transfer agent services; aggregating and processing purchase and redemption orders; providing periodic statements; receiving and transmitting funds; processing dividend payments; providing sub-accounting services; forwarding shareholder communications; receiving, tabulating and transmitting proxies; responding to inquiries and performing such other related services as the Fund may request. Each Plan allows for annual payments not to exceed 0.25% of average daily net assets.

The Funds may invest in obligations of the Custodian and may purchase or sell securities from or to the Custodian.

Ernst & Young LLP, 155 North Wacker Drive, Chicago, Illinois 60606, is the Funds’ independent registered public accounting firm (“auditors”). The auditors audit and report on the Funds’ annual financial statements, review certain regulatory reports and the Funds’ federal income tax returns, and perform other professional accounting, auditing, tax and advisory services when pre-approved by the Trust’s Audit Committee and engaged to do so by the Trust.

Vedder Price P.C., 222 North LaSalle Street, Chicago, Illinois 60601, acts as the Trust’s legal counsel and as counsel to the Independent Trustees.

The Adviser is responsible for decisions to buy and sell securities for the Funds, broker-dealer selection, and negotiation of brokerage commission rates. The primary consideration of the Adviser in effecting a securities transaction will be execution at the most favorable securities price. The Trust understands that some of the portfolio transactions of a Fund may be transacted with primary market makers acting as principal on a net basis, with no brokerage commissions being paid by the Fund. Such principal transactions may, however, result in a profit to market makers. Other portfolio transactions may include transactions on behalf of a Fund on stock exchanges and other agency transactions that involve payment by the Fund of a negotiated brokerage commission. Such commissions may vary among different brokers. In certain instances the Adviser may make purchases of underwritten issues for the Funds at prices that include underwriting fees.

In selecting a broker-dealer to execute each particular transaction, the Adviser will take the following into consideration: the best net price available; the reliability, integrity and financial condition of the broker-dealer; the size of and difficulty in executing the order; and the value of the expected contribution of the broker-dealer to the investment performance of the Funds on a continuing basis. Accordingly, the price to a Fund in any transaction may be less favorable than that available from another broker-dealer if the difference is reasonably justified by other aspects of the portfolio trade execution services offered. Subject to such policies as the Board of Trustees may determine, the Adviser shall not be

deemed to have acted unlawfully or to have breached any duty created by the advisory agreement solely by reason of its having caused the Funds to pay a broker or dealer that provides brokerage or research services to the Adviser an amount of commission for effecting a portfolio transaction in excess of the amount of commission another broker or dealer would have charged for effecting that transaction, if the Adviser determined in good faith that such amount of commission was reasonable in relation to the value of the brokerage and research services provided by such broker or dealer, viewed in terms of either that particular transaction or the Adviser’s overall responsibilities with respect to the Trust or other accounts for which the Adviser has investment discretion. The Adviser is further authorized to allocate the orders placed by it on behalf of the Funds to such brokers or dealers who also provide research or statistical material, or other services, to the Trust, the Adviser or any affiliate of the foregoing. Such allocation shall be in such amounts and proportions as the Adviser shall determine and the Adviser shall report on such allocations regularly to the Board of Trustees, indicating the broker-dealers to which such allocations have been made and the basis therefore.

With respect to issues of securities involving brokerage commissions, when more than one broker or dealer is believed to be capable of providing the best combination of price and execution with respect to a particular portfolio transaction for a Fund, the Adviser may select a broker or dealer that furnishes it with brokerage or research services such as research reports, subscriptions to financial publications and research compilations, compilations of securities prices, earnings, dividends and similar data, computer data bases, quotation equipment and services, research-oriented computer software and services, monitoring and reporting services, and services of economic and other consultants consistent with Section 28(e) of the Securities Exchange Act of 1934, as amended. As a result of such research, the Adviser may cause a Fund to pay commissions that are higher than otherwise obtainable from other brokers, provided that the Adviser determines in good faith that the commissions are reasonable in relation to the brokerage or research services provided by the broker. Selection of brokers or dealers is not made pursuant to an agreement or understanding with any of the brokers or dealers; however, the Adviser uses an internal allocation procedure to identify those brokers or dealers who provide it with research products or services and the amount of research products or services they provide, and endeavors to direct sufficient commissions generated by its clients’ accounts in the aggregate, including the Funds, to ensure the continued receipt of research products or services the Adviser feels are useful. In certain instances, the Adviser may receive from brokers and dealers products or services that are used both as investment research and for administrative, marketing or other nonresearch purposes. In such instances, the Adviser will make a good faith effort to determine the relative proportions of such products or services which may be considered as investment research, and this allocation process poses a potential conflict of interest to the Adviser. The portion of the costs of such products or services attributable to research usage may be defrayed by the Adviser (without prior agreement or understanding, as noted above) through brokerage commissions generated by transactions by clients (including the Funds), while the portion of the costs attributable to nonresearch usage of such products or services is paid by the Adviser in cash. Research products or services furnished by brokers and dealers may be used in servicing any or all of the clients of the Adviser, and not all such research products or services are used in connection with the management of the Funds. Information received from brokers by the Adviser will be in addition to, and not in lieu of, the services required to be performed under the advisory agreement. Any advisory or other fees paid to the Adviser are not reduced as a result of the receipt of research services.

For the fiscal year ended December 31, 2013, the Driehaus Active Income Fund and Driehaus Select Credit Fund paid brokerage commissions of $368,980 and $201,017, respectively. For the period August 26, 2013 through December 31, 2013, the Driehaus Event Driven Fund paid brokerage commissions of $35,860. For the fiscal year ended December 31, 2014, the Driehaus Active Income Fund, Driehaus Select Credit Fund and Driehaus Event Driven Fund paid brokerage commissions of $418,378, $375,576 and $1,148,286, respectively. For the fiscal year ended December 31, 2015, the Driehaus Active Income Fund, Driehaus Select Credit Fund and Driehaus Event Driven Fund paid brokerage commissions of $2,063,056, $854,473 and $1,324,322 respectively.

Directed Brokerage. During the year ended December 31, 2015, certain Funds allocated a portion of their brokerage transactions to firms based upon research services and information provided. The table below shows the amount of brokerage transactions allocated and related commissions paid by the Funds during the fiscal year ended December 31, 2015.

The chart below identifies the Funds’ “regular broker-dealers,” the securities of which were held by the Funds as of December 31, 2015 and the dollar value of such securities.

If for any taxable year a Fund does not qualify as a regulated investment company for U.S. federal income tax purposes, it would be treated as a regular corporation subject to federal income tax and distributions to its shareholders would not be deductible by the Fund in computing its taxable income. In addition, the Fund’s distributions, to the extent derived from its current or accumulated earnings and profits, would generally constitute ordinary dividends, which would generally be eligible for the dividends received deduction available to corporate shareholders under Section 243 of the Code, and individual and other noncorporate shareholders of the Fund generally would be able to treat such distributions as “qualified dividend income” under Section 1(h)(11) of the Code, as discussed below, provided certain holding period and other requirements are satisfied.

Distributions of investment company taxable income, which includes net investment income, and net short-term capital gain in excess of net long-term capital loss, are generally taxable as ordinary income to the extent of the Fund’s current and accumulated earnings and profits. Under Section 1(h)(11) of the Code, qualified dividend income received by individual and other noncorporate shareholders is taxed for federal income tax purposes at rates equivalent to long-term capital gain tax rates, which currently reach a maximum of 20%. Qualified dividend income generally includes dividends from certain domestic corporations and dividends from “qualified foreign corporations.” For these purposes, a qualified foreign corporation is a foreign corporation (i) that is incorporated in a possession of the United States or is eligible for benefits under a qualifying income tax treaty with the United States, or (ii) whose stock with respect to which such dividend is paid is readily tradable on an established securities market in the United States. A qualified foreign corporation does not include a foreign corporation which for the taxable year of the corporation in which the dividend was paid, or the preceding taxable year, is a “passive foreign investment company,” as defined in the Code.

A Fund generally can pass the federal income tax treatment of qualified dividend income it receives through to its shareholders to the extent of the aggregate qualified dividends received by the Fund. For a Fund to receive qualified dividend income, the Fund must meet certain holding period and other requirements with respect to the stock on which the otherwise qualified dividend is paid. In addition, the Fund cannot be obligated to make payments (pursuant to a short sale or otherwise) with respect to substantially similar or related property. If a Fund lends portfolio securities, amounts received by the Fund that are the equivalent of the dividends paid by the issuer on the securities loaned will not be eligible for qualified dividend income treatment. The same provisions, including the holding period requirements, apply to each shareholder’s investment in the Fund. If a Fund receives dividends from another fund that qualifies as a regulated investment company and the other fund designates such dividends as qualified dividend income, then the Fund may in turn designate that portion of its distributions derived from those dividends as qualified dividend income as well, provided the Fund meets the holding period and other requirements with respect to its shares of the other fund. It is not expected that a significant portion of a Fund’s distributions will be treated as qualified dividend income. Distributions of net capital gain, if any, are taxable as long-term capital gains for U.S. federal income tax purposes without regard to the length of time the shareholder has held shares of the Fund. A distribution of an amount in excess of a Fund’s current and accumulated earnings and profits, if any, will be treated by a shareholder as a tax-free return of capital which is applied against and reduces the shareholder’s basis in his or her shares. To the extent that the amount of any such distribution exceeds the shareholder’s basis in his or her shares, the excess will be treated by the shareholder as gain from the sale or exchange of shares. The U.S. federal income tax status of all distributions will be designated by each Fund and reported to the shareholders annually.

If a Fund invests in certain pay-in-kind securities, zero coupon securities, deferred interest securities or, in general, any other securities with original issue discount (or with market discount if the Fund elects to include market discount in income currently), the Fund must accrue income on such investments for each taxable year, which generally will be prior to the receipt of the corresponding cash payments. However, each Fund must distribute to shareholders, at least annually, all or substantially all of its investment company taxable income (determined without regard to the deduction for dividends paid), including such accrued income, to avoid federal income and excise taxes. Therefore, a Fund may have to dispose of its portfolio securities under disadvantageous circumstances to generate cash, or may have to leverage itself by borrowing the cash, to satisfy these distribution requirements.

Each Fund may also acquire market discount bonds. A market discount bond is a security acquired in the secondary market at a price below its redemption value (or its adjusted issue price if it is also an original issue discount bond). If a Fund invests in a market discount bond, it will be required to treat any gain recognized on the disposition of such market discount bond as ordinary income (instead of capital gain) to the extent of the accrued market discount unless the Fund elects to include the market discount in income as it accrues.

Each Fund may engage in certain options, futures, forwards, swaps, short sales, foreign currency and other transactions. These transactions may be subject to special provisions under the Code that may accelerate or defer recognition of certain gains or losses, change the character of certain gains or losses or alter the holding periods of certain of a Fund’s portfolio securities. These rules could therefore affect the character, amount and timing of distributions made to shareholders.

For federal income tax purposes, a Fund generally is required to recognize as income for each taxable year its net unrealized capital gains and losses as of the end of the year on certain futures, futures options, non-equity options positions and certain foreign currency contracts (“year-end mark-to-market”). Generally, any gain or loss recognized with respect to such positions is considered to be 60% long-term capital gain or loss and 40% short-term capital gain or loss, without regard to the holding periods of the positions. However, in the case of positions classified as part of a “mixed straddle,” in which an election is properly made, the recognition of losses on certain positions (including options, futures and futures options positions, the related securities and certain successor positions thereto) may be deferred to a later taxable year. Sale of futures contracts or writing of call options (or futures call options) or buying put options (or futures put options) that are intended to hedge against a change in the value of securities held by a Fund: (i) will generally affect the holding period of the hedged securities; and (ii) may cause unrealized gain or loss on such securities to be recognized upon entry into the hedge.

Each Fund may enter into swaps or other notional principal contracts. Payments made or received pursuant to the terms of a notional principal contract are divided into three categories, (i) a “periodic” payment; (ii) a “nonperiodic” payment; and (iii) a “termination” payment. Periodic payments are payments made or received pursuant to a notional principal contract that are payable at intervals of one year or less during the entire term of the contract, that are based on certain types of specified indexes (which include indexes based on objective financial information), and that are based on either a single notional principal amount or a notional principal amount that varies over the term of the contract in the same proportion as the notional principal amount that measures the other party’s payments. A nonperiodic payment is any payment made or received with respect to a notional principal contract that is not a periodic payment or a “termination payment.” All taxpayers, regardless of their method of accounting, must generally recognize for federal income tax purposes the ratable daily portion of a periodic and a nonperiodic payment for the taxable year to which that payment relates.

The application of certain requirements for qualification as a regulated investment company and the application of certain

other federal income tax rules may be unclear in some respects in connection with investments in certain derivatives and other investments. As a result, a Fund may be required to limit the extent to which it invests in such investments and it is also possible that the IRS may not agree with the Fund’s treatment of such investments. In addition, the tax treatment of derivatives and certain other investments may be affected by future legislation, Treasury Regulations and guidance issued by the IRS (which could apply retroactively) that could affect the timing, character and amount of a Fund’s income and gains and distributions to shareholders, affect whether a Fund has made sufficient distributions and otherwise satisfied the requirements to maintain its qualification as a regulated investment company and avoid federal income and excise taxes or limit the extent to which a Fund may invest in certain derivatives and other investments in the future.

Foreign exchange gains and losses realized by a Fund in connection with certain transactions involving foreign currency-denominated debt securities, certain options and futures contracts relating to foreign currency, foreign currency forward contracts, foreign currencies, or payables or receivables denominated in a foreign currency are subject to Section 988 of the Code, which generally causes such gain and loss to be treated as ordinary income or loss and may affect the amount, timing and character of distributions to shareholders.

Generally, the character of the income or capital gains that a Fund receives from another investment company will pass through to the Fund’s shareholders as long as the Fund and the other investment company each qualify as regulated investment companies. However, to the extent that another investment company that qualifies as a regulated investment company realizes net losses on its investments for a given taxable year, a Fund will not be able to recognize its share of those losses until it disposes of shares of such investment company. Moreover, even when a Fund does make such a disposition, a portion of its loss may be recognized as a long-term capital loss, which will not be treated as favorably for federal income tax purposes as an ordinary deduction. In particular, a Fund will not be able to offset any capital losses from its dispositions of shares of other investment companies against its ordinary income. As a result of the foregoing rules, and certain other special rules, it is possible that the amounts of net investment income and net capital gains that a Fund will be required to distribute to shareholders will be greater than such amounts would have been had the Fund invested directly in the securities held by the investment companies in which it invests, rather than investing in shares of the investment companies. For similar reasons, the character of distributions from a Fund (e.g., long-term capital gain, qualified dividend income, etc.) will not necessarily be the same as it would have been had the Fund invested directly in

Each Fund’s investments in REIT equity securities may result in the Fund’s receipt of cash in excess of the REIT’s earnings; if the Fund distributes these amounts, these distributions could constitute a return of capital to Fund shareholders for federal income tax purposes. Investments in REIT equity securities also may require a Fund to accrue and distribute income not yet received. To generate sufficient cash to make the requisite distributions, a Fund may be required to sell securities in its portfolio (including when it is not advantageous to do so) that it otherwise would have continued to hold. Dividends received by a Fund from a REIT will not qualify for the corporate dividends received deduction and generally will not constitute qualified dividend income.

Under a notice issued by the IRS, a portion of a Fund’s income from residual interests in real estate mortgage investment conduits (“REMICs”) or from a REIT (or other pass-through entity) that is attributable to the REIT’s residual interest in a REMIC or an equity interest in a taxable mortgage pool (referred to in the Code as an “excess inclusion”) will be subject to federal income tax in all events. This notice also provides that excess inclusion income of a regulated investment company, such as the Funds, will be allocated to shareholders of the regulated investment company in proportion to the dividends received by such shareholders, with the same consequences as if the shareholders held the related REMIC or taxable mortgage pool interest directly. In general, excess inclusion income allocated to shareholders (i) cannot be offset by net operating losses (subject to a limited exception for certain thrift institutions), (ii) will constitute unrelated business taxable income (“UBTI”) to entities (including a qualified pension plan, an individual retirement account, a 401(k) plan, a Keogh plan or other tax-exempt entity) subject to tax on UBTI, thereby potentially requiring such an entity that is allocated excess inclusion income, and otherwise might not be required to file a federal income tax return, to file a tax return and pay tax on such income, and (iii) in the case of a non-U.S. shareholder, will not qualify for any reduction in U.S. federal withholding tax. In addition, if at any time during any taxable year a “disqualified organization” (as defined by the Code) is a record holder of a share in a regulated investment company, then the regulated investment company will be subject to a tax equal to that portion of its excess inclusion income for the taxable year that is allocable to the disqualified organization, multiplied by the highest federal income tax rate imposed on corporations.

Each Fund anticipates distributing to shareholders annually all net capital gains, if any, that have been recognized for federal income tax purposes including year-end mark-to-market gains. Shareholders will be advised of the nature of these payments.

Each Fund is subject to a nondeductible 4% federal excise tax on the excess of the required distribution for a calendar year over the distributed amount for such calendar year. The required distribution is the sum of 98% of the Fund’s ordinary income for the calendar year plus 98.2% of its capital gain net income for the one-year period ending October 31, plus any undistributed amounts from prior calendar years, minus any overdistribution from prior calendar years. The Funds intend to declare or distribute dividends during the appropriate periods of an amount sufficient to prevent imposition of this 4% excise tax.

A shareholder who redeems or exchanges shares of a Fund will generally recognize capital gain or loss for federal income tax purposes measured by the difference between the value of the shares redeemed or exchanged and the basis of such shares. If a shareholder held such shares for more than one year, the gain, if any, will be a long-term capital gain. Long-term capital gain is taxable to individual and other noncorporate shareholders at a maximum federal income tax rate of 20%. The gain or loss on shares held for one year or less will generally be treated as short-term capital gain or loss. If a shareholder realizes a loss on the redemption of a Fund’s shares and reinvests in substantially identical shares of the Fund (including through dividend reinvestment) or other substantially identical stock or securities within 30 days before or after the redemption, the transactions may be subject to the “wash sale” rules resulting in a postponement of the recognition of such loss for federal income tax purposes. In such a case, the basis of the shares acquired will be adjusted to reflect the disallowed loss. Any loss realized on the redemption of Fund shares held for six months or less will be treated as long-term capital loss to the extent of any long-term capital gain distributions received by the shareholder with respect to such shares. Capital losses may be subject to limitations on their use by a shareholder.

Passive Foreign Investment Companies. Each Fund may purchase the securities of certain foreign investment funds or trusts called passive foreign investment companies (“PFICs”). In addition to bearing its proportionate share of the Fund’s expenses (management fees and operating expenses), shareholders will also indirectly bear similar expenses of such PFICs. Gains on the sale of PFIC holdings will be deemed to be ordinary income regardless of how long the Fund holds its investment. In addition, the Fund may be subject to corporate income tax and an interest charge on certain dividends and capital gains earned (or deemed earned) from PFICs, regardless of whether such income and gains are distributed to shareholders.

Non-U.S. shareholders, including shareholders who, with respect to the U.S., are nonresident alien individuals, may be subject to U.S. withholding tax on certain distributions (whether received in cash or shares) at a rate of 30% or such lower rate as prescribed by an applicable tax treaty. However, a Fund will generally not be required to withhold tax on any amounts paid to a non-U.S. investor with respect to dividends attributable to qualified short-term gain (i.e., the excess of net short-term capital gain over net long-term capital loss) designated as such by the Fund and dividends attributable to certain U.S. source interest income that would not be subject to federal withholding tax if earned directly by a non-U.S. person, provided such amounts are properly designated by the Fund. A Fund may choose not to designate such amounts.

Special rules apply to foreign persons who receive distributions from a Fund that are attributable to gain from “United States real property interests” (“USRPIs”). The Code defines USRPIs to include direct holdings of U.S. real property and any interest (other than an interest solely as a creditor) in a “United States real property holding corporation” or a former United States real property holding corporation. The Code defines a United States real property holding corporation as any corporation whose USRPIs make up 50% or more of the fair market value of its USRPIs, its interests in real property located outside the United States, plus any other assets it uses in a trade or business. In general, if a Fund is a United States real property holding company (determined without regard to certain exceptions), distributions by the Fund that are

attributable to (a) gains realized on the disposition of USPRIs by the Fund and (b) distributions received by the Fund from a lower-tier regulated investment company or REIT that the Fund is required to treat as USRPI gain in its hands will retain their character as gains realized from USRPIs in the hands of the foreign persons. (However, absent the enactment of legislation, on or after January 1, 2014, this “look-through” treatment for distributions by a Fund to foreign persons applies only to such distributions that are attributable to distributions received by the Fund from a lower-tier REIT and are required to be treated as USRPI gain in the Fund’s hands. It is currently unclear whether Congress will extend this provision and what the terms of any such extension would be, including whether any such extension would have retroactive effect.) If the foreign shareholder holds (or has held at any time during the prior year) more than a 5% interest in a class of stock of a Fund, such distributions received by the shareholder with respect to such class of stock will be treated as gains “effectively connected” with the conduct of a “U.S. trade or business,” and subject to tax at graduated rates. Moreover, such shareholders will be required to file a U.S. income tax return for the year in which the gain was recognized and the Fund will be required to withhold 35% of the amount of such distribution. In the case of all other foreign persons (i.e., those whose interest in the Fund did not exceed 5% at any time during the prior year), the USRPI distribution will be treated as ordinary income (regardless of any designation by the Fund that such distribution is qualified short-term gain or net capital gain) and the Fund must withhold 30% (or a lower applicable treaty rate) of the amount of the distribution paid to such foreign persons.

In addition, if a Fund is a United States real property holding corporation or former United States real property holding corporation, the Fund may be required to withhold U.S. tax upon a redemption of shares by a greater-than-5% shareholder that is a foreign person, and that shareholder would be required to file a U.S. income tax return for the year of the disposition of the USRPI and pay any additional tax due on the gain. Prior to January 1, 2014, no withholding is generally required with respect to amounts paid in redemption of shares of a fund if the fund was a domestically controlled qualified investment entity, or, in certain other limited cases, if a fund (whether or not domestically controlled) held substantial investments in regulated investment companies that were domestically controlled qualified investment entities. This exemption from withholding has expired and such withholding is required, without regard to whether a fund or any regulated investment company in which it invests is domestically controlled. It is currently unclear whether Congress will extend the exemption from withholding described above for redemptions made on or after January 1, 2014, and what the terms of any such extension would be, including whether any such extension would have retroactive effect.

Cost basis information. The Funds are required to report to you and the IRS annually on Form 1099-B the cost basis of shares purchased or acquired on or after January 1, 2012 where the cost basis of the shares is known by the Funds (referred to as “covered shares”) and which are disposed of after that date. However, cost basis reporting is not required for certain shareholders, including shareholders investing in the Funds through a tax-advantaged arrangement, such as a 401(k) or an IRA.

information to you. Therefore, shareholders should carefully review the cost basis information provided by the Funds.