(Columbia Convertible Securities Fund)

Investment Objective

The Fund seeks total return, consisting of capital appreciation and current income.

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.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees (Columbia Convertible Securities Fund)	Class R4 Shares	Class R5 Shares
Maximum sales charge (load) imposed on purchases, as a % of offering price	none	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net asset value	none	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses (Columbia Convertible Securities Fund)		Class R4 Shares	Class R5 Shares
Management fees		0.82%	0.82%
Distribution and/or service (Rule 12b-1) fees		none	none
Other expenses	[1]	0.21%	0.08%
Total annual Fund operating expenses		1.03%	0.90%
Fee waivers and/or reimbursements	[2]	(0.11%)	(0.11%)
Total annual Fund operating expenses after fee waivers and/or reimbursements		0.92%	0.79%

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 Class R4 or Class R5 shares of the Fund 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 table above.

Since the waivers and/or reimbursements shown in the Annual Fund Operating Expenses table above expire on November 8, 2013, they are only reflected in the 1 year example and the first year of the 3, 5 and 10 year examples.

Based on the assumptions listed above, your costs would be:

Expense Example (Columbia Convertible Securities Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class R4 Shares	94	317	558	1,249
Class R5 Shares	81	276	488	1,098

Remember this is an example only. Your actual costs may be higher or lower.

Portfolio Turnover

The Fund pays 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 66% of the average value of its portfolio.

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 80% of its net assets in convertible securities. The Fund may invest up to 15% of its total assets in Eurodollar convertible securities and up to an additional 20% of its total assets in foreign securities. Most convertible securities are not investment grade-rated. Convertible securities rated below investment grade may be referred to as "junk bonds." The Fund also may invest in other equity securities.

Columbia Management Investment Advisers, LLC, the Fund's investment adviser (the Investment Manager), looks for opportunities to participate in the potential growth of underlying common stocks, while seeking to earn income that is generally higher than the income those stocks provide. The Fund may sell common stocks short against positions in which the Fund has directly invested in convertible securities with no more than 10% of its assets.

The Investment Manager considers a number of factors in identifying investment opportunities and constructing the Fund's portfolio. Although an evaluation of the characteristics of a security, including its conversion features, may be the primary factor for most portfolio decisions, the Investment Manager considers other factors as well, including, among others:

• overall economic and market conditions; and

• the financial condition and management of a company, including its competitive position, the quality of its balance sheet and earnings, its future prospects, and the potential for growth and stock price appreciation.

The Investment Manager tries to limit conversion costs and generally sells securities when they take on the trading characteristics of the underlying common stock. The Investment Manager also may convert securities to common shares when it believes it's appropriate to do so.

Principal Risks

• Investment Strategy Risk – The Fund's manager uses the principal investment strategies and other investment strategies to seek to achieve the Fund's investment objective. There is no assurance that the Fund will achieve its investment objective. Investment decisions may not produce the expected returns, may cause the Fund's shares to lose value or may cause the Fund to underperform other funds with similar investment objectives.

• Market Risk – Market risk refers to the possibility that the market values of securities that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. Security values may fall because of factors affecting individual companies, industries or sectors, or the markets as a whole, reducing the value of an investment in the Fund. Accordingly, an investment in the Fund could lose money over short or even long periods, or fail to increase in value. The market values of the securities the Fund holds also can be affected by changes or perceived changes in U.S. or foreign economies and financial markets, and the liquidity of these securities, among other factors. In general, equity securities tend to have greater price volatility than debt securities.

• Convertible Securities Risk – Convertible securities are subject to the usual risks associated with debt securities, such as interest rate risk and credit risk. Convertible securities also react to changes in the value of the common stock into which they convert. Because the value of a convertible security can be influenced by both interest rates and the common stock's market movements, a convertible security generally is not as sensitive to interest rates as a similar debt security, and generally will not vary in value in response to other factors to the same extent as the underlying common stock. In the event of a liquidation of the issuing company, holders of convertible securities would typically be paid before the company's common stockholders but after holders of any senior debt obligations of the company. The Fund may be forced to convert a convertible security before it otherwise would choose to do so, which may decrease the Fund's return.

• Low and Below Investment Grade Securities Risk – Debt securities with the lowest investment grade rating (e.g., BBB by Standard & Poor's, a division of the McGraw-Hill Companies, Inc. (S&P), or Fitch, Inc. (Fitch) or Baa by Moody's Investors Service, Inc. (Moody's)), or that are below investment grade (which are commonly referred to as "junk bonds") (e.g., BB or below by S&P or Fitch or Ba by Moody's) and unrated securities of comparable quality are more speculative than securities with higher ratings and may experience greater price fluctuations. These securities tend to be more sensitive to credit risk than higher-rated securities, particularly during a downturn in the economy, which is more likely to weaken the ability of the issuers to make principal and interest payments on these securities. These securities typically pay a premium – a higher interest rate or yield – because of the increased risk of loss, including default. These securities also are generally less liquid than higher-rated securities. The securities ratings provided by Moody's, S&P and Fitch are based on analyses by these ratings agencies of the credit quality of the securities and may not take into account every risk related to whether interest or principal will be timely repaid.

• Interest Rate Risk – Debt securities are subject to interest rate risk. In general, if prevailing interest rates rise, the values of debt securities will tend to fall, and if interest rates fall, the values of debt securities will tend to rise. Changes in the value of a debt security usually will not affect the amount of income the Fund receives from it but may affect the value of the Fund's shares. Interest rate risk is generally greater for debt securities with longer maturities/durations.

• Credit Risk – Credit risk applies to most debt securities, but is generally less of a factor for obligations backed by the "full faith and credit" of the U.S. Government. The Fund could lose money if the issuer of a debt security owned by the Fund is unable or perceived to be unable to pay interest or repay principal when it becomes due. Various factors could affect the issuer's actual or perceived willingness or ability to make timely interest or principal payments, including changes in the issuer's financial condition or in general economic conditions. Debt securities backed by an issuer's taxing authority may be subject to legal limits on the issuer's power to increase taxes or otherwise to raise revenue, or may be dependent on legislative appropriation or government aid. Certain debt securities are backed only by revenues derived from a particular project or source, rather than by an issuer's taxing authority, and thus may have a greater risk of default.

• Foreign Securities Risk – Foreign securities are subject to special risks as compared to securities of U.S. issuers. For example, foreign markets can be extremely volatile. Fluctuations in currency exchange rates may impact the value of foreign securities denominated in foreign currencies, or in U.S. dollars, without a change in the intrinsic value of those securities. Foreign securities may be less liquid than domestic securities so that the Fund may, at times, be unable to sell foreign securities at desirable times or prices. Brokerage commissions, custodial fees and other fees are also generally higher for foreign securities. The Fund may have limited or no legal recourse in the event of default with respect to certain foreign securities, including those issued by foreign governments. In addition, foreign governments may impose potentially confiscatory withholding or other taxes, which could reduce the amount of income and capital gains available to distribute to shareholders. Other risks include possible delays in the settlement of transactions or in the payment of income; generally less publicly available information about companies; the impact of political, social or diplomatic events; possible seizure, expropriation or nationalization of a company or its assets; possible imposition of currency exchange controls; and accounting, auditing and financial reporting standards that may be less comprehensive and stringent than those applicable to domestic companies.

• Prepayment and Extension Risk — Prepayment and extension risk is the risk that a loan, bond or other security might be called or otherwise converted, prepaid or redeemed before maturity. This risk is primarily associated with asset-backed securities, including mortgage-backed securities and floating rate loans. If a loan or security is converted, prepaid or redeemed before maturity, particularly during a time of declining interest rates or spreads, the portfolio managers may not be able to invest the proceeds in securities or loans providing as high a level of income, resulting in a reduced yield to the Fund. Conversely, as interest rates rise or spreads widen, the likelihood of prepayment decreases. The portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads because the Fund's investments are locked in at a lower rate for a longer period of time.

• Short Sales Risk – A short sale generally involves the sale by the Fund of a security it does not own with the expectation of acquiring the security at a later time at a lower price, but can involve the sale by the Fund of a security it does own. In order to short sell a common stock, the Fund must borrow, buy or already hold the security in order to make delivery to the counterparty. If the Fund borrows the security, it then is obligated to replace the security at some later time. The price of the security at such time may be higher or lower than the price at which the security was sold short by the Fund. Therefore, the Fund bears the risk that the price of the security at the time of replacement has not decreased. Short sales can potentially involve unlimited loss, as the market price of securities sold short may continue to increase, although the Fund may be able to limit any such losses by purchasing the securities sold short. There also is a risk that the Fund may experience difficulty purchasing the security necessary for replacement if the security does not have a liquid market at the time that the replacement must occur or that an event may occur. The Fund's use of short sales in effect "leverages" the Fund, as the Fund may use the cash proceeds from short sales to invest in additional long positions. Leverage potentially exposes the Fund to greater risks of loss due to unanticipated market movements, which may magnify losses and increase the volatility of returns. In addition, the Fund will incur additional expenses by engaging in short sales in the form of transaction costs, and interest and dividend expenses paid to the lender of the security.

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. Class R4 and Class R5 shares had not commenced operations prior to the date of this prospectus; therefore, performance information for these classes is not yet available. The performance of Class A shares, which have been outstanding longer than any other share class of the Fund, is shown in the bar chart and average annual total return table. Except for differences in annual returns resulting from differences in expenses and sales charges (where applicable), these classes of shares would have annual returns substantially similar to those of Class A shares, which are not offered in this prospectus, because all classes of the Fund's shares invest in the same portfolio of securities.

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 www.columbiamanagement.com.

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.

Year by Year Total Return (%) as of December 31 Each Year

^[1]

Best and Worst Quarterly Returns During this Period

Best:    3rd quarter 2009:    12.42%

Worst:   4th quarter 2008:   -17.91%

Average Annual Total Return as of December 31, 2011

The table compares the Fund's returns for each period with those of the Bank of America Merrill Lynch (BofAML) All Convertibles All Qualities Index, which measures the performance of U.S. dollar-denominated convertible securities not currently in bankruptcy with a total market value greater than $50 million at issuance.

Average Annual Total Returns (Columbia Convertible Securities Fund)	1 Year	5 Years	10 Years
Class A Shares	(10.47%)	0.09%	3.69%
Class A Shares returns after taxes on distributions	(11.23%)	(1.05%)	2.28%
Class A Shares returns after taxes on distributions and sale of Fund shares	(6.64%)	(0.37%)	2.57%
Class A Shares returns before taxes (without sales charges)	(5.03%)	1.29%	4.30%
BofAML All Convertibles All Qualities Index (reflects no deductions for fees, expenses or taxes)	(5.18%)	2.10%	4.88%

The after-tax returns shown in the table above 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).

Returns after taxes on distributions and sale of Fund shares are higher than before-tax returns for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of Fund shares.

[1] Other expenses are based on estimated amounts for the current fiscal year.

[2] Columbia Management Investment Advisers, LLC (the Investment Manager) and certain of its affiliates have contractually agreed to waive fees and/or to reimburse expenses (excluding certain fees and expenses, such as transaction costs and certain other investment related expenses, interest, taxes, acquired fund fees and expenses, and extraordinary expenses) until November 8, 2013, unless sooner terminated at the sole discretion of the Fund's Board of Trustees. Under this agreement, the Fund's net operating expenses, subject to applicable exclusions, will not exceed the annual rates of 0.92% for Class R4 and 0.79% for Class R5.

[1] Year-to-date return as of September 30, 2012: 10.64%