Alger SMid Cap Growth Fund

Summary Prospectus

March 1, 2015, As Revised January 15, 2016

Class   Ticker Symbols

I   ASIMX

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 and other information about the Fund online at www.alger.com. You can also get this information at no cost by calling 1(800) 992-3863 or by sending an e-mail request to summaryprospectus@alger.com. The Fund's Prospectus and Statement of Additional Information, both dated March 1, 2015, are incorporated by reference to this Summary Prospectus, and may be obtained at no cost in the same manner as described above.

Investment Objective

Alger SMid Cap Growth Fund seeks long-term capital appreciation.

Fund Fees and Expenses

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

	Class I
Shareholder Fees (fees paid directly from your investment)		None
Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Management Fees		.81	%
Distribution and/or Shareholder Servicing (12b-1) Fees		.25	%
Other Expenses		.21	%
Total Annual Fund Operating Expenses		1.27	%

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 assumes that you invest $10,000 in the Fund for the time periods indicated, 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 you would pay the following expenses whether or not you redeemed your shares at the end of each period:

	1 Year		3 Years		5 Years		10 Years
Class I	$	129	$	403	$	697	$	1,534

Inspired by Change, Driven by Growth.

ALGER SMID CAP GROWTH FUND 2/4

Summary Prospectus

March 1, 2015, As Revised January 15, 2016

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 91.59% of the average value of its portfolio.

Principal Investment Strategy

Fred Alger Management, Inc. believes companies undergoing Positive Dynamic Change offer the best investment opportunities. Positive Dynamic Change refers to companies realizing High Unit Volume Growth or companies undergoing Positive Lifecycle Change. High Unit Volume Growth companies are traditional growth companies experiencing, for example, significantly growing demand or market dominance. Positive Lifecycle Change companies are, for example, companies benefitting from regulatory change, a new product introduction or management change.

Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of smallcap and midcap companies. The Fund focuses on smallcap and midcap companies that Fred Alger Management, Inc. believes demonstrate promising growth potential. Smallcap or midcap companies are companies that, at the time of purchase, have total market capitalization within the range of companies included in the Russell 2500 Growth Index or the Russell Midcap Growth Index, respectively, as reported by the indexes as of the most recent quarter-end. At December 31, 2014, the market capitalization of the companies in these indexes ranged from $30.7 million to $33.5 billion.

The Fund can leverage, that is, borrow money to buy additional securities. By borrowing money, the Fund has the potential to increase its returns if the increase in the value of the securities purchased exceeds the cost of borrowing, including interest paid on the money borrowed.

Principal Risks

As with any fund that invests in stocks, your investment will fluctuate in value, and the loss of your investment is a risk of investing. The Fund's price per share will fluctuate due to changes in the market prices of its investments. Also, the Fund's investments may not grow as fast as the rate of inflation and stocks tend to be more volatile than some other investments you could make, such as bonds.

Prices of growth stocks tend to be higher in relation to their companies' earnings and may be more sensitive to market, political and economic developments than other stocks, making their prices more volatile. An investment in the Fund may be better suited to investors who seek long-term capital growth and can tolerate fluctuations in their investment's value.

The following risks also apply:

•  there may be greater risk in investing in companies with small or medium market capitalizations rather than larger, more established issuers owing to such factors as more limited product lines or financial resources or lack of management depth.

•  the cost of borrowing money to leverage may exceed the returns for the securities purchased or the securities purchased may actually go down in value; thus the Fund's net asset value could decrease more quickly than if it had not borrowed.

•  it may be difficult or impossible to liquidate a security position at a time and price acceptable to the Fund owing to the potentially less frequent trading of stocks of smaller market capitalization.

An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

ALGER SMID CAP GROWTH FUND 3/4

Summary Prospectus

March 1, 2015, As Revised January 15, 2016

Performance

The following bar chart and the table beneath it provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for the indicated periods compare with those of an appropriate benchmark of market performance. Performance prior to August 6, 2007, commencement of the Class I Share's operations, is that of the Fund's Class A Shares. Remember that the Fund's past performance (before and after taxes) is not necessarily an indication of how it will perform in the future. Updated performance information is available on the Fund's website www.alger.com.

Annual Total Return For Class I Shares* as of December 31 (%)

Average Annual Total Return as of December 31, 2014

	1 Year			5 Years			10 Years			Since 5/8/02
Class I (Inception 8/6/07)
Return Before Taxes		4.26	%		13.26	%		9.41	%*		8.83	%*
Return After Taxes on Distributions		0.82	%		11.51	%		8.33	%*		7.87	%*
Return After Taxes on Distributions and Sale of Fund Shares		4.86	%		10.49	%		7.64	%*		7.23	%*
Russell 2500 Growth Index (reflects no deduction for fees, expenses or taxes)		7.05	%		17.27	%		9.37	%		9.42	%

* Performance of the Fund's Class I Shares prior to August 6, 2007 reflects the performance of the Fund's Class A Shares, as adjusted with currently applicable sales charges and operating expenses, which differ from historical charges and expenses.

In the foregoing table, after-tax returns are calculated using the historical highest individual federal marginal 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. The after-tax returns shown may not be relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. A "Return After Taxes on Distributions and Sale of Fund Shares" may sometimes be higher than the other two return figures; this happens where there is a capital loss on redemptions, giving rise to a tax benefit to the shareholder.

ALGER SMID CAP GROWTH FUND 4/4

Summary Prospectus

March 1, 2015, As Revised January 15, 2016

Management

Investment Manager:	Portfolio Manager:
Fred Alger Management, Inc.	Jill Greenwald, CFA* Executive Vice President and Portfolio Manager Since Inception (5/8/02)

* Jill Greenwald is currently on a temporary medical leave of absence. During Ms. Greenwald's absence, Daniel C. Chung, Chief Executive Officer, Chief Investment Officer, and Portfolio Manager since January 2016, has primary responsibility for day-to-day management of the Fund's portfolio.

Shareholder Information

Purchasing and Redeeming Fund Shares

The Fund's Class I Shares are not subject to a minimum initial investment. Class I Shares are an investment vehicle principally for institutional investors such as registered investment advisers, banks, trust companies, and other financial institutions, for investments in employee benefit plans, or for advisory platform investors who pay a separate fee to such institution for the right to invest.

Investors may purchase or redeem Fund shares on any business day through a financial intermediary.

Tax Information

The Fund's distributions may be taxable as ordinary income or capital gains.

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 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 website for more information.

Fred Alger & Company, Incorporated 360 Park Avenue South, New York, NY 10010 / 800.992.3863 / www.alger.com

SMidI 11516