Summary Prospectus

January 1, 2014

Columbia Mid Cap Growth Fund

Class	Ticker Symbol
Class A Shares	CBSAX
Class B Shares	CBSBX
Class C Shares	CMCCX
Class I Shares	CMTIX
Class K Shares	CMCKX
Class R Shares	CMGRX
Class R4 Shares	CPGRX
Class R5 Shares	CMGVX
Class T Shares	CBSTX
Class W Shares	CMRWX
Class Y Shares	CMGYX
Class Z Shares	CLSPX

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 January 1, 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 Mid Cap Growth Fund (the Fund) seeks significant capital appreciation by investing, under normal market conditions, at least 80% of its net assets (plus any borrowings for investment purposes) in stocks of companies with a market capitalization, at the time of initial purchase, equal to or less than the largest stock in the Russell Midcap Index.

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. More information about these and other discounts is available from your financial intermediary, in the Choosing a Share Class section beginning on page 21 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)
	Classes A and T	Class B	Class C	Classes I, K, R, R4, R5, W, Y 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 K	Class R
Management fees	0.68%	0.68%	0.68%	0.68%	0.68%	0.68%
Distribution and/or service (12b-1) fees	0.25%	1.00%	1.00%	0.00%	0.00%	0.50%
Other expenses(d)	0.28%	0.28%	0.28%	0.09%	0.39%	0.28%
Total annual Fund operating expenses	1.21%	1.96%	1.96%	0.77%	1.07%	1.46%
	Class R4	Class R5	Class T	Class W	Class Y	Class Z
Management fees	0.68%	0.68%	0.68%	0.68%	0.68%	0.68%
Distribution and/or service (12b-1) fees	0.00%	0.00%	0.00%	0.25%	0.00%	0.00%
Other expenses(d)	0.28%	0.14%	0.58%	0.28%	0.09%	0.28%
Total annual Fund operating expenses	0.96%	0.82%	1.26%	1.21%	0.77%	0.96%

(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, Class R5, Class T, Class W, Class Y and Class Z have been restated to reflect contractual changes to certain fees paid by the Fund and other expenses for Class K are based on estimated amounts for the Fund’s current fiscal year.

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 Mid Cap Growth 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)	$691	$937	$1,202	$1,957
Class B (assuming redemption of all shares at the end of the period)	$699	$915	$1,257	$2,091
Class B (assuming no redemption of shares)	$199	$615	$1,057	$2,091
Class C (assuming redemption of all shares at the end of the period)	$299	$615	$1,057	$2,285
Class C (assuming no redemption of shares)	$199	$615	$1,057	$2,285
Class I (whether or not shares are redeemed)	$ 79	$246	$ 428	$ 954
Class K (whether or not shares are redeemed)	$109	$340	$ 590	$1,306
Class R (whether or not shares are redeemed)	$149	$462	$ 797	$1,746
Class R4 (whether or not shares are redeemed)	$ 98	$306	$ 531	$1,178
Class R5 (whether or not shares are redeemed)	$ 84	$262	$ 455	$1,014
Class T (whether or not shares are redeemed)	$696	$952	$1,227	$2,010
Class W (whether or not shares are redeemed)	$123	$384	$ 665	$1,466
Class Y (whether or not shares are redeemed)	$ 79	$246	$ 428	$ 954
Class Z (whether or not shares are redeemed)	$ 98	$306	$ 531	$1,178

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 109% of the average value of its portfolio.

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 80% of its net assets (including the amount of any borrowings for investment purposes) in equity securities (including, but not limited to, common stocks, preferred stocks and securities convertible into common or preferred stocks) of companies that have market capitalizations in the range of the companies in the Russell Midcap Index (the Index) at the time of purchase (between $896 million and $28.3 billion as of November 30, 2013).

The market capitalization range and composition of the companies in the Index is subject to change. The Fund may also invest up to 20% of its net assets in equity securities of companies that have market capitalizations outside the range of the Index.

The Fund invests primarily in common stocks of companies believed to have the potential for long-term, above-average earnings growth but may invest in companies for their short, medium or long-term prospects. The Fund may from time to time emphasize one or more economic sectors in selecting its investments, including the consumer discretionary sector.

The Fund may invest up to 20% of its total assets in foreign securities. The Fund may invest directly in foreign securities or indirectly through depositary receipts.

The Fund may invest in special situations such as companies involved in initial public offerings, tender offers, mergers and other corporate restructurings, and in companies involved in management changes or companies developing new technologies.

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.

Columbia Mid Cap Growth Fund 2

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 Fund 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.

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, and are thus subject to market risk. The Fund may also be forced to convert a convertible security at an inopportune time, which may decrease the Fund’s return.

Depositary Receipts Risks. Depositary receipts are receipts issued by a bank or trust company that evidence ownership of underlying securities issued by foreign companies. Some foreign securities are traded in the form of American Depositary Receipts (ADRs). Depositary receipts involve the risks of other investments in foreign securities, including risks associated with investing in the particular country, including the political, regulatory, economic, social and other conditions or events occurring in the country, as well as fluctuations in its currency. In addition, ADR holders may not have all the legal rights of shareholders and may experience difficulty in receiving shareholder communications.

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, 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. The performance of the Fund may be negatively impacted by foreign currency strength or weakness relative to the U.S. dollar, particularly where 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.

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 be more sensitive to adverse economic or other circumstances or changes in current or expected earnings than the market values of other types of securities. 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 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 even long periods. In general, equity securities tend to have greater price volatility than debt securities.

Mid-Cap Company Securities Risk. Investments in mid-capitalization companies (mid-cap companies) often involve greater risks than investments in larger, more established companies (larger companies) because 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, and may be less liquid than the securities of larger companies, and securities of mid-cap companies may be less liquid than the securities of larger companies.

Preferred Stock Risk. Preferred stock is a type of stock that generally pays dividends at a specified rate and that has preference over common stock in the payment of dividends and the liquidation of assets. Preferred stock does not ordinarily carry voting rights. The price of a preferred stock is generally determined by earnings, type of products or services, projected growth rates, experience of management, liquidity, and general market conditions of the markets on which the stock trades. The most significant risks associated with investments in preferred stock include issuer risk, market risk and interest rate risk (i.e., the risk of losses attributable to changes in interest rates).

3 Columbia Mid Cap Growth Fund

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. Companies in the same economic sector may be similarly affected by economic, regulatory, political or market events or conditions, making 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.

Special Situations Risk. Securities of companies that are involved in an initial public offering or a major corporate event, such as a business consolidation or restructuring, may present special risk because of the high degree of uncertainty that can be associated with such events. Securities issued in initial public offerings often are issued by companies that are in the early stages of development, have a history of little or no revenues and may operate at a loss following the offering. It is possible that there will be no active trading market for the securities after the offering, and that the market price of the securities may be subject to significant and unpredictable fluctuations. Investing in special situations may have a magnified effect on the performance of funds with small amounts of assets.

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. Class A share performance (without sales charges) is shown in the bar chart because Class A shares have at least ten calendar years of performance and Class A shares are the most common share class across the Columbia Funds complex that are available for investment by the general public. 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 Z shares (adjusted to reflect the higher class-related operating expenses of such classes, where applicable) for periods prior to its inception date. Class K shares of the Fund commenced operations after the periods ended shown in the table below and, therefore, performance is not yet available.

Any share class that does not have available performance would have annual returns substantially similar to those of Class Z shares. 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 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. After-tax returns are shown for Class A shares because Class A shares have at least ten calendar years of performance and Class A shares are the most common share class across the Columbia Funds complex that are available for investment by the general public.

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.

Columbia Mid Cap Growth Fund 4

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	3rd Quarter 2009	19.11%
	Worst	4th Quarter 2008	-27.29%

* Year to Date return as of September 30, 2013: 22.40%

Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2012)

	Share Class Inception Date	1 Year	5 Years	10 Years
Class A	11/01/2002
returns before taxes		4.40%	0.67%	8.34%
returns after taxes on distributions		3.94%	0.37%	7.78%
returns after taxes on distributions and sale of Fund shares		3.46%	0.51%	7.25%
Class B returns before taxes	11/01/2002	4.88%	0.73%	8.16%
Class C returns before taxes	10/13/2003	8.90%	1.10%	8.21%
Class I returns before taxes	09/27/2010	11.29%	2.21%	9.34%
Class R returns before taxes	01/23/2006	10.47%	1.61%	8.75%
Class R4 returns before taxes	11/08/2012	11.07%	2.13%	9.29%
Class R5 returns before taxes	03/07/2011	11.22%	2.18%	9.32%
Class T returns before taxes	11/01/2002	4.33%	0.61%	8.30%
Class W returns before taxes	09/27/2010	10.80%	1.89%	9.03%
Class Y returns before taxes	07/15/2009	11.19%	2.19%	9.32%
Class Z returns before taxes	11/20/1985	11.03%	2.13%	9.29%
Russell Midcap Growth Index (reflects no deductions for fees, expenses or taxes)		15.81%	3.23%	10.32%
Russell Midcap Index (reflects no deductions for fees, expenses or taxes)		17.28%	3.57%	10.65%

Fund Management

Investment Manager: Columbia Management Investment Advisers, LLC

Portfolio Manager	Title	Role with Fund	Managed Fund Since
George Myers, CFA	Portfolio Manager	Lead Manager	2006
Brian Neigut	Portfolio Manager	Co-manager	2007
James King	Portfolio Manager	Co-manager	September 2013
William Chamberlain, CFA	Portfolio Manager	Co-manager	September 2013

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

5 Columbia Mid Cap Growth Fund

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, exchange or sell shares of the Fund in or from 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 & T*	Nonqualified accounts	$2,000	$100
	Individual retirement accounts	$1,000	$100
Classes I, K**, R & R4	All eligible accounts	None	None
Class R5	Combined underlying accounts of eligible registered investment advisers	$100,000	N/A
	Omnibus retirement plans	None	N/A
Class W	All eligible accounts	$500	N/A
Class Y	Omnibus retirement plans with at least $10 million in plan assets	None	N/A
	All other eligible omnibus retirement plans	$500,000	N/A
Class Z	All eligible accounts	$0, $1,000 or $2,000 depending upon the category of eligible investor.	$100

*	This class of shares is generally closed to new and existing shareholders.
**	This class of shares is generally closed to new investors.

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.

Columbia Mid Cap Growth Fund 6

225 Franklin Street, Boston, MA 02110

800.345.6611 columbiamanagement.com

© 2014 Columbia Management Investment Distributors, Inc. SUM194_08_D01_(01/14)