Columbia Funds Series Trust

Summary Prospectus

June 25, 2014

Columbia Marsico International Opportunities Fund

Class		Ticker Symbol
Class A Shares		MAIOX
Class B Shares		MBIOX
Class C Shares		MCIOX
Class I Shares		CMOIX
Class R Shares		CMORX
Class R4 Shares		CLFRX
Class Z Shares		NMOAX

Before you invest, you may want to review the Fund’s prospectus, which contains more information about the Fund and its risks. You can find the Fund’s prospectus, statement of additional information and other information about the Fund online at https://www.columbiamanagement.com/web/columbia/forms-literature/fund-literature. You can also get this information at no cost by calling 800.345.6611 or by sending an email to serviceinquiries@columbiamanagement.com. This Summary Prospectus incorporates by reference the Fund’s prospectus, dated June 25, 2014, and current Statement of Additional Information.

As with all mutual funds, the Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense.

Investment Objective

Columbia Marsico International Opportunities Fund (the Fund) seeks long-term growth of capital.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and members of your immediate family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. (the Distributor). More information about these and other discounts is available from your financial intermediary, and can be found in the Choosing a Share Class section beginning on page 19 of the Fund’s prospectus and in Appendix S to the Statement of Additional Information (SAI) under Sales Charge Waivers beginning on page S-1.

Shareholder Fees (fees paid directly from your investment)
	Class A	Class B	Class C	Classes I, R, R4 and Z
Maximum sales charge (load) imposed on purchases (as a % of offering price)	5.75%	None	None	None
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)	1.00% ^(a)	5.00% ^(b)	1.00% ^(c)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
	Class A	Class B	Class C	Class I	Class R	Class R4	Class Z
Management fees	0.79%	0.79%	0.79%	0.79%	0.79%	0.79%	0.79%
Distribution and/or service (12b-1) fees	0.25%	1.00%	1.00%	0.00%	0.50%	0.00%	0.00%
Other expenses^(d)	0.37%	0.37%	0.37%	0.19%	0.37%	0.37%	0.37%
Total annual Fund operating expenses	1.41%	2.16%	2.16%	0.98%	1.66%	1.16%	1.16%

(a)	This charge is imposed on certain investments of between $1 million and $50 million redeemed within 18 months of purchase, as follows: 1.00% if redeemed within 12 months of purchase, and 0.50% if redeemed more than 12, but less than 18, months after purchase, with certain limited exceptions.
(b)	This charge decreases over time.
(c)	This charge applies to redemptions within one year of purchase, with certain limited exceptions.
(d)	Other expenses for Class A, Class B, Class C, Class R, Class R4 and Class Z shares have been restated to reflect contractual changes to certain fees paid by the Fund.

Example

The following 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 illustrates the hypothetical expenses that you would incur over the time periods indicated, and assumes that:

■	you invest $10,000 in the applicable class of Fund shares for the periods indicated,
■	your investment has a 5% return each year, and
■	the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expenses table above.

1	Columbia Marsico International Opportunities Fund

Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:

	1 year	3 years	5 years	10 years
Class A (whether or not shares are redeemed)	$710	$996	$1,302	$2,169
Class B (assuming redemption of all shares at the end of the period)	$719	$976	$1,359	$2,303
Class B (assuming no redemption of shares)	$219	$676	$1,159	$2,303
Class C (assuming redemption of all shares at the end of the period)	$319	$676	$1,159	$2,493
Class C (assuming no redemption of shares)	$219	$676	$1,159	$2,493
Class I (whether or not shares are redeemed)	$100	$312	$ 542	$1,201
Class R (whether or not shares are redeemed)	$169	$523	$ 902	$1,965
Class R4 (whether or not shares are redeemed)	$118	$368	$ 638	$1,409
Class Z (whether or not shares are redeemed)	$118	$368	$ 638	$1,409

Portfolio Turnover

The Fund may pay transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate 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 141% of the average value of its portfolio.

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 65% of its total assets in common stocks of foreign companies. The Fund may invest in an unlimited number of companies of any size throughout the world that are selected for their long-term growth potential. The Fund normally invests in issuers from at least three different countries not including the United States. The Fund may invest in common stocks of companies operating in, or economically tied to, emerging market countries. Some issuers or securities in the Fund's portfolio may be based in, or economically tied to, the United States. The Fund may from time to time emphasize one or more economic sectors in selecting its investments, including the consumer discretionary sector and the information technology and technology-related sectors.

The core investments of the Fund (i.e., the primary investments held by the Fund over time) generally may include established companies and securities that are expected to offer long-term growth potential. However, the Fund's portfolio also may typically include securities of less mature companies, securities with more aggressive growth characteristics, and securities of companies undergoing significant positive developments, such as, without limitation, the introduction of a new product line, the appointment of a new management team, or an acquisition.

The Fund’s investment strategy may involve the frequent trading of portfolio securities. This may cause the Fund to incur higher transaction costs (which may adversely affect the Fund’s performance) and may increase taxable distributions for shareholders.

Principal Risks

An investment in the Fund involves risk, including those described below. There is no assurance that the Fund will achieve its investment objective and you may lose money. The value of the Fund’s holdings may decline, and the Fund’s net asset value (NAV) and share price may go down.

Active Management Risk. Due to its active management, the Fund could underperform its benchmark index and/or other funds with similar investment objectives. The Fund may fail to achieve its investment objective and you may lose money.

Emerging Market Securities Risk. Securities issued by foreign governments or companies in emerging market countries, like Russia and those in Eastern Europe, the Middle East, Asia, Latin America or Africa, are more likely to have greater exposure to the risks of investing in foreign securities that are described in Foreign Securities Risk. In addition, emerging market countries are more likely to experience instability resulting, for example, from rapid changes or developments in social, political and economic conditions. Their economies are usually less mature and their securities markets are typically less developed with more limited trading activity (i.e., lower trading volumes and less liquidity) than more developed countries. Emerging market securities tend to be more volatile than securities in more developed markets. Many emerging market countries are heavily dependent on international trade and have fewer trading partners, which makes them more sensitive to world commodity prices and economic downturns in other countries, and some have a higher risk of currency devaluations.

Foreign Securities Risk. Investments in or exposure to foreign securities involve certain risks not associated with investments in or exposure to securities of U.S. companies. Foreign securities subject the Fund to the risks associated with investing in the particular country of an issuer, including the political, regulatory, economic, social, diplomatic and other conditions or events occurring in the country or region, as well as risks associated with less developed custody and settlement practices. Foreign securities may be more volatile and less liquid than investments in securities of U.S. companies, and are subject to the risks

Columbia Marsico International Opportunities Fund

associated with potential imposition of economic and other sanctions against a particular foreign country, its nationals or industries or businesses within the country. The performance of the Fund may be negatively impacted by fluctuations in a foreign currency’s strength or weakness relative to the U.S. dollar, particularly if the Fund invests a significant percentage of its assets in foreign securities or other assets denominated in currencies other than the U.S. dollar.

Frequent Trading Risk. The portfolio managers may actively and frequently trade investments in the Fund's portfolio to carry out its investment strategies. Frequent trading of investments increases the possibility that the Fund, as relevant, will realize taxable capital gains (including short-term capital gains, which are generally taxable to shareholders at higher rates than long-term capital gains for U.S. federal income tax purposes), which could reduce the Fund's after-tax return. Frequent trading can also mean higher brokerage and other transaction costs, which could reduce the Fund's return. The trading costs and tax effects associated with portfolio turnover may adversely affect the Fund’s performance.

Geographic Concentration Risk/Europe Risk. The Fund may be particularly susceptible to economic, political, regulatory or other events or conditions affecting issuers and countries in Europe. Currency devaluations could occur in countries that have not yet experienced currency devaluation to date, or could continue to occur in countries that have already experienced such devaluations. In addition, the private and public sectors’ debt problems of a single European Union (EU) country can pose significant economic risks to the EU as a whole. As a result, the Fund may be more volatile than a more geographically diversified fund. If securities of issuers in Europe fall out of favor, it may cause the Fund to underperform other funds that do not concentrate in this region of the world.

Growth Securities Risk. Growth securities typically trade at a higher multiple of earnings than other types of equity securities. Accordingly, the market values of growth securities may never reach their expected market value and may decline in price. In addition, growth securities, at times, may not perform as well as value securities or the stock market in general, and may be out of favor with investors for varying periods of time.

Issuer Risk. An issuer in which the Fund invests or to which it has exposure may perform poorly, and the value of its securities may therefore decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors.

Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or long periods. Although equity securities generally tend to have greater price volatility than debt securities, under certain market conditions debt securities may have comparable or greater price volatility.

Sector Risk. At times, the Fund may have a significant portion of its assets invested in securities of companies conducting business in a related group of industries within an economic sector, including the consumer discretionary sector and the information technology and technology-related sectors. Companies in the same economic sector may be similarly affected by economic, regulatory, political or market events or conditions, which may make the Fund more vulnerable to unfavorable developments in that economic sector than funds that invest more broadly. The more a fund diversifies its investments, the more it spreads risk and potentially reduces the risks of loss and volatility.

The Fund may be more susceptible to the particular risks that may affect companies in the consumer discretionary sector than if it were invested in a wider variety of companies in unrelated sectors. Companies in the consumer discretionary sector are subject to certain risks, including fluctuations in the performance of the overall domestic and international economy, interest rate changes, increased competition and consumer confidence. Performance of such companies may be affected by factors including reduced disposable household income, reduced consumer spending, changing demographics and consumer tastes.

The Fund may be more susceptible to the particular risks that may affect companies in the information technology sector, as well as other technology-related sectors (collectively, the technology sectors) than if it were invested in a wider variety of companies in unrelated sectors. Companies in the technology sectors are subject to certain risks, including the risk that new services, equipment or technologies will not be accepted by consumers and businesses or will become rapidly obsolete. Performance of such companies may be affected by factors including obtaining and protecting patents (or the failure to do so) and significant competitive pressures, including aggressive pricing of their products or services, new market entrants, competition for market share and short product cycles due to an accelerated rate of technological developments. Such competitive pressures may lead to limited earnings and/or falling profit margins. As a result, the value of their securities may fall or fail to rise. In addition, many technology sector companies have limited operating histories and prices of these companies’ securities historically have been more volatile than other securities, especially over the short term.

Small- and Mid-Cap Company Securities Risk. Investments in small- and mid-capitalization companies (small- and mid-cap companies) often involve greater risks than investments in larger, more established companies (larger companies) because small- and mid-cap companies tend to have less predictable earnings and may lack the management experience, financial resources, product diversification and competitive strengths of larger companies. Securities of small- and mid-cap companies may be less liquid and more volatile than the securities of larger companies.

3	Columbia Marsico International Opportunities Fund

Performance Information

The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges) for the periods shown with benchmark performance.

The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class include the returns of the Fund’s Class A shares (without applicable sales charges and adjusted to reflect the higher class-related operating expenses of such classes, where applicable) for periods prior to its inception date. Except for differences in annual returns resulting from differences in expenses and sales charges (where applicable), the share classes of the Fund would have substantially similar annual returns because all share classes of the Fund invest in the same portfolio of securities.

The after-tax returns shown in the Average Annual Total Returns table below are calculated using the highest historical individual U.S. federal marginal income tax rates and do not reflect the impact of state, local or foreign taxes. Your actual after-tax returns will depend on your personal tax situation and may differ from those shown in the table. In addition, the after-tax returns shown in the table do not apply to shares held in tax-deferred accounts such as 401(k) plans or Individual Retirement Accounts (IRAs).

The after-tax returns are shown only for Class A shares and will vary for other share classes.

The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future. Updated performance information can be obtained by calling toll-free 800.345.6611 or visiting columbiamanagement.com.

Year by Year Total Return (%) as of December 31 Each Year*	Best and Worst Quarterly Returns During the Period Shown in the Bar Chart
	_Best	_{2nd Quarter 2009}	_26.57%
	_Worst	_{4th Quarter 2008}	_-27.68%

*	Year to Date return as of March 31, 2014: -4.55%

Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2013)

	Share Class Inception Date	1 Year	5 Years	10 Years
Class A	08/01/2000
returns before taxes		13.26%	11.97%	6.02%
returns after taxes on distributions		13.08%	11.77%	5.34%
returns after taxes on distributions and sale of Fund shares		7.94%	9.60%	4.90%
Class B returns before taxes	08/01/2000	14.26%	12.22%	5.84%
Class C returns before taxes	08/01/2000	18.35%	12.46%	5.85%
Class I returns before taxes	09/27/2010	20.57%	13.74%	6.84%
Class R returns before taxes	01/23/2006	19.88%	13.01%	6.38%
Class R4 returns before taxes	11/08/2012	20.35%	13.37%	6.67%
Class Z returns before taxes	08/01/2000	20.56%	13.61%	6.91%
MSCI EAFE Index (Net) (reflects reinvested dividends net of withholding taxes but reflects no deductions for fees, expenses or other taxes)		22.78%	12.44%	6.91%

Columbia Marsico International Opportunities Fund

Fund Management

Investment Manager: Columbia Management Investment Advisers, LLC

Subadviser: Marsico Capital Management, LLC

Portfolio Manager	Title	Role with Fund	Managed Fund Since
James Gendelman	Portfolio Manager and Senior Analyst for Marsico	Co-manager	2000
Munish Malhotra, CFA	Senior Analyst and Portfolio Manager for Marsico	Co-manager	2010

Purchase and Sale of Fund Shares

You may purchase or redeem shares of the Fund on any business day by contacting the Fund in the ways described below:

Online		Regular Mail		Express Mail		By Telephone
columbiamanagement.com		Columbia Funds, c/o Columbia Management Investment Services Corp. P.O. Box 8081 Boston, MA 02266-8081		Columbia Funds, c/o Columbia Management Investment Services Corp. 30 Dan Road, Suite 8081 Canton, MA 02021-2809		800.422.3737

You may purchase shares and receive redemption proceeds by electronic funds transfer, by check or by wire. If you maintain your account with a broker-dealer or other financial intermediary, you must contact that financial intermediary to buy, sell or exchange shares of the Fund through your account with the intermediary.

The minimum initial investment amounts for the share classes offered by the Fund are shown below:

Minimum Initial Investment

Class	Category of eligible account	For accounts other than systematic investment plan accounts	For systematic investment plan accounts
Classes A, B* & C	All accounts other than IRAs	$2,000	$100
Classes A, B* & C	IRAs	$1,000	$100
Classes I, R & R4	All eligible accounts	None	N/A
Class Z	All eligible accounts	$0, $1,000 or $2,000 depending upon the category of eligible investor	$100

*	Class B shares are generally closed to new and existing shareholders.

There is no minimum additional investment for any share class.

Tax Information

The Fund normally distributes net investment income and net realized capital gains, if any, to shareholders. These distributions are generally taxable to you as ordinary income or capital gains, unless you are investing through a tax-advantaged account, such as a 401(k) plan or an IRA. If you are investing through a tax-advantaged account, you may be taxed upon withdrawals from that account.

Payments to Broker-Dealers and Other Financial Intermediaries

If you purchase the Fund through a broker-dealer or other financial intermediary (such as a bank), the Fund and its related companies — including Columbia Management Investment Advisers, LLC (the Investment Manager), Columbia Management Investment Distributors, Inc. (the Distributor) and Columbia Management Investment Services Corp. (the Transfer Agent) — 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 financial advisor to recommend the Fund over another investment. Ask your financial advisor or visit your financial intermediary’s website for more information.

5	Columbia Marsico International Opportunities Fund

225 Franklin Street, Boston, MA 02110

800.345.6611 columbiamanagement.com

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