Alger Mid Cap Growth Fund (Prospectus Summary) | Alger Mid Cap Growth Fund

Alger Mid Cap Growth Fund

INVESTMENT OBJECTIVE

Alger Mid 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. You may qualify for sales charge discounts if you and your
family invest, or agree to invest in the future, at least $25,000 in Class A
Shares of the Alger Family of Funds, including the Fund. More information about
these and other discounts is available from your financial professional and in
"Purchasing and Redeeming Fund Shares" beginning on page A-2 of the Fund's
Prospectus and the sections "Right of Accumulation (Class A Shares)" and "Letter
of Intent (Class A Shares)" on page 20 of the Fund's Statement of Additional
Information.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Alger Mid Cap Growth Fund	Class A	Class B	Class C
Maximum sales charge (load) imposed on purchases as a % of offering price	5.25%	none	none
Maximum deferred sales charge (load) as a % of purchase price or redemption proceeds, whichever is lower	none	5.00%	1.00%
Redemption Fee (as a % of amount redeemed or exchanged within 30 days)	2.00%	2.00%	2.00%

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

Annual Fund Operating Expenses Alger Mid Cap Growth Fund	Class A	Class B	Class C
Management Fees	0.76%	0.76%	0.76%
Distribution and/or Service (12b-1) Fees	0.25%	1.00%	1.00%
Other Expenses	0.37%	0.35%	0.44%
Total Annual Fund Operating Expenses	1.38%	2.11%	2.20%

EXAMPLE

The following 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 $10,000.00 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 if you redeemed your shares at the end of each period:

Expense Example Alger Mid Cap Growth Fund (USD $)	Expense Example, With Redemption, 1 Year	Expense Example, With Redemption, 3 Years	Expense Example, With Redemption, 5 Years	Expense Example, With Redemption, 10 Years
Class A	658	939	1,241	2,095
Class B	714	961	1,334	2,255
Class C	323	688	1,180	2,534

You would pay the following expenses if you did not redeem your shares:

Expense Example, No Redemption Alger Mid Cap Growth Fund (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
Class A	658	939	1,241	2,095
Class B	214	661	1,134	2,255
Class C	223	688	1,180	2,534

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 examples, affect the Fund's
performance. During the most recent fiscal year, the Fund's portfolio
turnover rate was 245.44% 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.

The Fund focuses on mid-sized companies that Fred Alger Management, Inc.
believes demonstrate promising growth potential. Under normal circumstances,
the Fund invests at least 80% of its net assets in equity securities of companies
that, at the time of purchase of the securities, have total market capitalization
within the range of companies included in the Russell Midcap Growth Index or
the S&P MidCap 400 Index, as reported by the indexes as of the most recent
quarter-end. Both indexes are designed to track the performance of
medium-capitalization stocks. At December 31, 2011, the market capitalization of
the companies in these indexes ranged from $116.7 million to $20.4 billion.

The Fund can also invest in derivative instruments. The Fund currently expects
that its primary uses of derivatives will involve: (1) purchasing put and call
options and selling (writing) covered put and call options, on securities and
securities indexes, to increase gain, to hedge against the risk of unfavorable
price movements in the underlying securities, or to provide diversification of risk,
and(2) entering into forward currency contracts to hedge the Fund's foreign
currency exposure when it holds,or proposes to hold, non-U.S. dollar
denominated securities.

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.

A small investment in derivatives could have a potentially large impact on the
Fund's performance. When purchasing options, the Fund bears the risk that if the
market value of the underlying security does not move to a level that would make
exercise of the option profitable, the option will expire unexercised. When a
call option written by the Fund is exercised, the Fund will not participate in
any increase in the underlying security's value above the exercise price. When a
put option written by the Fund is exercised, the Fund will be required to
purchase the underlying security at a price in excess of its market value. Use
of options on securities indexes is subject to the risk that trading in the
options may be interrupted if trading in certain securities included in the
index is interrupted, the risk that price movements in the Fund's portfolio
securities may not correlate precisely with movements in the level of an index,
and the risk that Fred Alger Management, Inc. may not predict correctly
movements in the direction of a particular market or of the stock market
generally. Because certain options may require settlement in cash, the Fund may
be forced to liquidate portfolio securities to meet settlement obligations.
Forward currency contracts are subject to currency exchange rate risks, the risk
of non-performance by the contract counterparty, and the risk that Fred Alger
Management, Inc. may not predict accurately future foreign exchange rates.

The following risks may also apply:

• the possibility of greater risk by investing in medium-capitalization
companies rather than larger, more established companies due to such factors
as inexperienced management and limited product lines or financial resources.

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

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 in the bar chart does not reflect the effect of the
sales charge imposed on purchases of Class A Shares of the Fund. If the bar
chart reflected the applicable sales charges, returns would be less than those
shown. Remember that a 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 A SHARES as of December 31 (%)

Best Quarter:
Q2 2003  20.22%

Worst Quarter:
Q4 2008  -32.40%

AVERAGE ANNUAL TOTAL RETURN AS OF DECEMBER 31, 2011

Average Annual Total Returns Alger Mid Cap Growth Fund	Average Annual Returns, Label	Average Annual Returns, 1 Year	Average Annual Returns, 5 Years	Average Annual Returns, 10 Years	Average Annual Returns, Since Inception	Average Annual Returns, Inception Date
Class A	Class A Return Before Taxes	(13.03%)	(3.21%)	1.53%	6.40%	Dec. 31, 1996	[1]
Class A After Taxes on Distributions	Class A Return After Taxes on Distributions	(13.03%)	(4.34%)	0.37%	4.35%	Dec. 31, 1996	[1]
Class A After Taxes on Distributions and Sales	Class A Return After Taxes on Distributions and Sale of Fund Shares	(8.47%)	(3.18%)	0.83%	4.51%	Dec. 31, 1996	[1]
Class B	Class B Return Before Taxes	(13.49%)	(3.25%)	1.46%	6.35%	May 24, 1993	[1]
Class C	Class C Return Before Taxes	(10.05%)	(2.99%)	1.26%	5.93%	Jul. 31, 1997	[1]
Russell MidCap Growth Index	Russell MidCap Growth Index (reflects no deduction for fees, expenses or taxes)	(1.65%)	2.44%	5.29%	6.52%	Dec. 31, 1996	[1]

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. After-tax returns for Class B and C Shares, which are not shown, will
vary from those shown for Class A Shares. 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.

[1] Performance of the Fund's Class C Shares prior to July 31, 1997 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. Since inception performance of the Fund's Class B Shares is available upon request.