SUMMARY PROSPECTUS    October 30, 2015

AB Growth Fund

Ticker: Class A–AGRFX; Class B–AGBBX; Class C–AGRCX; Class R–AGFRX; Class K–AGFKX; Class I–AGFIX; Advisor Class–AGRYX

Before you invest, you may want to review the Fund’s Prospectus, which contains more information about the Fund and its risks. The Fund’s Prospectus and Statement of Additional Information (“SAI”), both dated October 30, 2015, are incorporated by reference into this Summary Prospectus. For free paper or electronic copies of the Fund’s Prospectus and other information about the Fund, go to http://www.ABglobal.com/links/mf, email a request to prorequest@ABglobal.com, call (800) 227-4618, or ask any financial advisor, bank, or broker-dealer who offers shares of the Fund.

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INVESTMENT OBJECTIVE

The Fund’s investment objective is 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 reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AB Mutual Funds. More information about these and other discounts is available from your financial intermediary and in Investing in the Funds—Sales Charge Reduction Programs for Class A Shares on page 55 of the Fund’s Prospectus and in Purchase of Shares—Sales Charge Reduction Programs for Class A Shares on page 120 of the Fund’s SAI.

Shareholder Fees (fees paid directly from your investment)

	Class A Shares	Class B Shares (not currently offered to new investors)	Class C Shares	Advisor Class Shares	Class R, K and I Shares
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	4.25%	None	None	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	None(a)	4.00%(b)	1.00%(c)	None	None
Exchange Fee	None	None	None	None	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		Advisor Class		Class R		Class K		Class I
Management Fees		.75%		.75%		.75%		.75%		.75%		.75%		.75%
Distribution and/or Service (12b-1) Fees		.25%		1.00%		1.00%		None		.50%		.25%		None
Other Expenses:
Transfer Agent		.20%		.30%		.22%		.19%		.26%		.19%		.12%
Other Expenses		.09%		.07%		.07%		.08%		.07%		.07%		.08%
Total Other Expenses		.29%		.37%		.29%		.27%		.33%		.26%		.20%
Total Annual Fund Operating Expenses		1.29%		2.12%		2.04%		1.02%		1.58%		1.26%		.95%

(a) Purchases of Class A shares in amounts of $1,000,000 or more, or by certain group retirement plans, may be subject to a 1%, 1-year contingent deferred sales charge, or CDSC, which may be subject to waiver in certain circumstances.

(b) Class B shares automatically convert to Class A shares after eight years. The CDSC decreases over time. For Class B shares, the CDSC decreases 1.00% annually to 0% after the fourth year.

(c) For Class C shares, the CDSC is 0% after the first year.

Examples

The Examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the

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end of those periods. The Examples also assume that your investment has a 5% return each year and that the Fund’s operating expenses stay the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

	Class A		Class B		Class C		Advisor Class		Class R		Class K		Class I
After 1 Year	$	551	$	615	$	307	$	104	$	161	$	128	$	97
After 3 Years	$	817	$	864	$	640	$	325	$	499	$	400	$	303
After 5 Years	$	1,102	$	1,139	$	1,098	$	563	$	860	$	692	$	525
After 10 Years	$	1,915	$	2,240	$	2,369	$	1,248	$	1,878	$	1,523	$	1,166

For the share classes listed below, you would pay the following expenses if you did not redeem your shares at the end of the period.

	Class B		Class C
After 1 Year	$	215	$	207
After 3 Years	$	664	$	640
After 5 Years	$	1,139	$	1,098
After 10 Years	$	2,240	$	2,369

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys or 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 transaction costs, which are not reflected in the Annual Fund Operating Expenses or in the Examples, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 59% of the average value of its portfolio.

PRINCIPAL STRATEGIES

The Fund invests primarily in a domestic portfolio of equity securities of companies selected by the Fund’s Adviser for their growth potential within various market sectors. When selecting securities, the Adviser looks for companies that have experienced management teams, strong market positions, and the potential to deliver greater-than-expected earnings growth rates.

In managing the Fund, the Adviser allocates investments among broad sector groups and selects specific investments based on the fundamental company research conducted by the Adviser’s internal research staff, assessing the current and forecasted investment opportunities and conditions, as well as diversification and risk considerations. The Adviser’s research focus is on companies with high sustainable growth prospects, high or improving return on invested capital, transparent business models, and clear competitive advantages.

The Fund has the flexibility to invest across the capitalization spectrum. The Fund is designed for those seeking exposure to companies of various sizes, and typically has substantial investments in both large-capitalization companies and mid-capitalization companies, and may also invest in small-capitalization companies.

The Fund may enter into derivatives transactions, such as options, futures contracts, forwards and swaps. The Fund may use options strategies involving the purchase and/or writing of various combinations of call and/or put options, including on individual securities and stock indices, futures contracts (including futures contracts on individual securities and stock indices) or shares of exchange-traded funds. These transactions may be used, for example, in an effort to earn extra income, to adjust exposure to individual securities or markets, or to protect all or a portion of the Fund’s portfolio from a decline in value.

PRINCIPAL RISKS

• Market Risk: The value of the Fund’s assets will fluctuate as the stock or bond market fluctuates. The value of its investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events that affect large portions of the market. It includes the risk that a particular style of investing, such as growth, may underperform the market generally.

• Capitalization Risk: Investments in small- and mid-capitalization companies may be more volatile than investments in large-capitalization companies. Investments in small-capitalization companies may have additional risks because these companies have limited product lines, markets or financial resources.

• Derivatives Risk: Derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Fund, and may be subject to counterparty risk to a greater degree than more traditional investments.

• Focused Portfolio Risk: Investments in a limited number of companies may have more risk because changes in the value of a single security may have a more significant effect, either negative or positive, on the Fund’s net asset value, or NAV.

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• Management Risk: The Fund is subject to management risk because it is an actively-managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions for the Fund, but there is no guarantee that its techniques will produce the intended results.

As with all investments, you may lose money by investing in the Fund.

BAR CHART AND PERFORMANCE INFORMATION

The bar chart and performance information provide an indication of the historical risk of an investment in the Fund by showing:

• how the Fund’s performance changed from year to year over ten years; and

• how the Fund’s average annual returns for one, five and ten years compare to those of a broad-based securities market index.

You may obtain updated performance information on the Fund’s website at www.ABglobal.com (click on “Menu—Americas—Individual Investors—US (US Citizens)”, then “Investments—Products and Performance—Mutual Funds”).

The Fund’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.

Bar Chart

The annual returns in the bar chart are for the Fund’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown. Through September 30, 2015, the year-to-date unannualized return for Class A shares was 1.66%.

During the period shown in the bar chart, the Fund’s:

Best Quarter was up 15.47%, 1st quarter, 2012; and Worst Quarter was down -22.97%, 4th quarter, 2008.

Performance Table

Average Annual Total Returns

(For the periods ended December 31, 2014)

		1 Year		5 Years		10 Years
Class A*	Return Before Taxes		8.10%		13.68%		5.99%
	Return After Taxes on Distributions		6.87%		13.42%		5.87%
	Return After Taxes on Distributions and Sale of Fund Shares		5.55%		10.99%		4.82%
Class B	Return Before Taxes		7.97%		13.75%		5.78%
Class C	Return Before Taxes		11.07%		13.84%		5.68%
Advisor Class	Return Before Taxes		13.23%		15.02%		6.78%
Class R**	Return Before Taxes		12.61%		14.48%		6.34%
Class K**	Return Before Taxes		12.96%		14.85%		6.67%
Class I**	Return Before Taxes		13.35%		15.22%		7.01%
Russell 3000® Growth Index (reflects no deduction for fees, expenses, or taxes)			12.44%		15.89%		8.50%

* After-tax returns:

– Are shown for Class A shares only and will vary for the other Classes of shares because these Classes have different expense ratios;

– Are an estimate, which is based on the highest historical individual federal marginal income tax rates, and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor’s tax situation and are likely to differ from those shown; and

– Are not relevant to investors who hold fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.

** Inception date for Class R, Class K and Class I shares: 3/1/05. Performance information for periods prior to the inception of Class R, Class K and Class I shares is the performance of the Fund’s Class A shares adjusted to reflect the respective expense ratios of the Class R, Class K and Class I shares.

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INVESTMENT ADVISER

AllianceBernstein L.P. is the investment adviser for the Fund.

PORTFOLIO MANAGERS

The following table lists the persons responsible for day-to-day management of the Fund’s portfolio:

Employee	Length of Service	Title
Bruce K. Aronow	Since 2013	Senior Vice President of the Adviser
Frank V. Caruso	Since 2008	Senior Vice President of the Adviser
John H. Fogarty	Since 2013	Senior Vice President of the Adviser

PURCHASE AND SALE OF FUND SHARES

Purchase Minimums

	Initial	Subsequent
Class A/Class C Shares, including traditional IRAs and Roth IRAs (Class B Shares are not currently offered to new shareholders)	$2,500	$50
Automatic Investment Program		$50 If initial minimum investment is less than $2,500, then $200 monthly until account balance reaches $2,500
Advisor Class Shares (only available to fee-based programs or through other limited or special arrangements approved by the Adviser)	None	None
Class A, Class R, Class K and Class I Shares are available at NAV, without an initial sales charge, to 401(k) plans, 457 plans, employer-sponsored 403(b) plans, profit-sharing and money purchase pension plans, defined benefit plans, and non-qualified deferred compensation plans where plan level or omnibus accounts are held on the books of the Fund.	None	None

You may sell (redeem) your shares each day the New York Stock Exchange is open. You may sell your shares through your financial intermediary or by mail (AllianceBernstein Investor Services, Inc., P.O. Box 786003, San Antonio, TX 78278-6003) or telephone (800-221-5672).

TAX INFORMATION

The Fund may pay income dividends or make capital gains distributions, which may be subject to federal income taxes and taxable as ordinary income or capital gains, and may also be subject to state and local taxes.

PAYMENTS TO BROKER-DEALERS AND OTHER FINANCIAL INTERMEDIARIES

If you purchase shares of the Fund through a broker-dealer or other financial intermediary (such as a bank or a group retirement plan), the Fund and its 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 financial intermediary and your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your financial intermediary’s website for more information.

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