Summary Prospectus February 26, 2010, as supplemented June 1, 2010

ING Index Plus International Equity Fund

Class / Ticker A/IFIAX; B/IFBBX; C/IFICX; I/IFIIX; O/IDIOX

Before you invest, you may want to review the Fund’s Prospectus, which contains more information about the Fund and its risks. The Prospectus and Statement of Additional Information (“SAI”), both dated February 26, 2010, as supplemented, and most recent financial report to shareholders dated October 31, 2009 are incorporated by reference into (are legally considered part of) this Summary Prospectus. For free paper or electronic copies of the Prospectus and other Fund information (including the SAI and most recent financial report to shareholders), go to www.INGFunds.com/literature, email a request to Literature_request@INGFunds.com, call 1-800-992-0180, or ask your salesperson, financial intermediary, or retirement plan administrator.

INVESTMENT OBJECTIVE

The Fund seeks to outperform the total return performance of the Morgan Stanley Capital International - Europe, Australasia, and Far East^® Index (“Index”), while maintaining a market level of risk.

FEES AND EXPENSES OF THE FUND

These tables describe 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 $50,000 in ING Funds. More information about these and other discounts is available from your financial professional and in the discussion in the Sales Charges section of the Prospectus (page 98) or the Statement of Additional Information (page 167).

Shareholder Fees
Fees paid directly from your investment

	Maximum sales charge (load) as a % of offering price	Maximum deferred sales charge as a % of purchase or sales price, whichever is less
A	5.75	None
B	None	5.00
C	None	1.00
I	None	None
O	None	None

Annual Fund Operating Expenses
Expenses you pay each year as a % of the value of your investment

		A	B	C	I	O
Management Fees	%	0.55	0.55	0.55	0.55	0.55
Distribution and Service (12b-1) Fees	%	0.25	1.00	1.00	N/A	0.25
Administrative Services Fees	%	0.10	0.10	0.10	0.10	0.10
Other Expenses	%	0.63	0.63	0.63	0.27	0.63
Total Annual Fund Operating Expenses1	%	1.53	2.28	2.28	0.92	1.53
Waivers, Reimbursements and Recoupments2	%	(0.38)	(0.38)	(0.38)	(0.02)	(0.38)
Total Annual Fund Operating Expenses after Waivers, Reimbursements and Recoupments	%	1.15	1.90	1.90	0.90	1.15

1

Total Annual Fund Operating Expenses may be higher than the Fund’s ratio of expenses to average net assets shown in the Fund’s Financial Highlights, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.

2

The adviser is contractually obligated to limit expenses to 1.15%, 1.90%, 1.90%, 0.90% and 1.15% for Class A, Class B, Class C, Class I and Class O shares, respectively, through at least March 1, 2011; the obligation does not extend to interest, taxes, brokerage commissions, extraordinary expenses and Acquired Fund Fees and Expenses. The obligation will automatically renew for one-year terms unless it is terminated by the Fund or the adviser upon written notice within 90 days of the end of the current term or upon termination of the advisory agreement and is subject to possible recoupment by the adviser within three years.

Expense Examples $

The Examples are intended to help you compare the cost of investing in shares of the Fund with the costs of investing in other mutual funds. The Examples also assume that you invest $10,000 in the Fund for the time periods indicated. It shows costs if you sold (redeemed) your shares at the end of the period or continued to hold them. The Examples also assume that your investment had 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 your costs would be:

	Share Status		1 Yr	3 Yrs	5 Yrs	10 Yrs
A	Sold or Held	$	685	995	1,327	2,263
B	Sold	$	693	976	1,386	2,397
	Held	$	193	676	1,186	2,397
C	Sold	$	293	676	1,186	2,586
	Held	$	193	676	1,186	2,586
I	Sold or Held	$	92	291	507	1,129
O	Sold or Held	$	117	446	798	1,791

1 of 4

The Examples reflect applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.

Portfolio Turnover % of average value of portfolio

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 transactions costs  and may mean higher taxes if you are investing 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 169% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

Under normal market conditions, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes) in stocks included in the Index, and in exchange-traded funds and derivatives (including futures and options) whose economic returns are similar to the Index or its components. The Fund will provide shareholders with at least 60 days’ prior notice of any change in this investment policy. The Index is a market value-weighted index that reflects the performance of approximately 1,100 securities listed on the stock exchanges of Europe, Australasia and the Far East. Exchange-traded funds are passively managed investment companies traded on a securities exchange whose goal is to track or replicate a desired index.

The Fund may also invest in securities that are convertible into common stocks included in the Index. The Fund may invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations and exemptive orders thereunder (“1940 Act”).

In managing the Fund, the Sub-Adviser attempts to achieve the Fund’s investment objective by overweighting those stocks in the Index that the Sub-Adviser believes will outperform the Index, and underweighting (or avoiding altogether) those stocks that the Sub-Adviser believes will underperform the Index. In determining stock weightings, the Sub-Adviser uses internally developed quantitative computer models to evaluate various criteria, such as cash flows, earnings and price-to-book ratios of each company, in an attempt to select companies with long-term sustainable growth characteristics at acceptable valuation levels. The Fund’s aggregate characteristics will approximate that of the Index.

At any one time, the Sub-Adviser generally includes in the Fund between 300 and 400 of the stocks included in the Index. Although the Fund will not hold all the stocks in the Index, the Sub-Adviser expects that there will be a close correlation between the performance of the Fund and that of the Index in both rising and falling markets. The Fund will pay transactional and other expenses that are not reflected in the Index. This will give the Fund a performance disadvantage in relation to the Index.

The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others.

The Fund may lend portfolio securities on a short-term or long-term basis, up to 33¹/₃% of its assets.

PRINCIPAL RISKS

You could lose money on an investment in the Fund. Any of the following risks, among others, could affect Fund performance or cause the Fund to lose money or to underperform market averages of other funds.

Company   The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless.

Convertible Securities  Convertible securities are securities that are convertible into or exercisable for common stock at a stated price or rate. Convertible securities are subject to the usual risks associated with debt securities, such as interest rate and credit risk. In addition, because convertible securities react to changes in the value of the stocks into which they convert, they are subject to market risk.

Currency   To the extent that the Fund invests directly in foreign currencies or in securities denominated in or that trade in foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged.

Derivative Instruments  Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Fund and reduce its returns.

Foreign Investments  Investing in foreign (non-U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies due to smaller markets, differing reporting, accounting and auditing standards, and nationalization, expropriation or confiscatory taxation, foreign currency fluctuations, currency blockage, or political changes or diplomatic developments.

Investment By Other Funds  Various other mutual funds and/or funds-of-funds, including some ING funds, may invest in the Fund. If investments by these other funds result in large inflows or outflows of cash from the Fund, the Fund’s performance or realization of capital gains could be affected.

Investment Model  The Sub-Adviser’s proprietary model may not adequately allow for existing or unforeseen market factors or the interplay between such factors.

Summary Prospectus February 26, 2010, as supplemented June 1, 2010 2 of 4 ING Index Plus International Equity Fund

Liquidity   If a security is illiquid, the Fund might be unable to sell the security at a time when the Fund’s sub-adviser might wish to sell, and the security could have the effect of decreasing the overall level of the Fund’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Fund could realize upon disposition. The Fund may make investments that become less liquid in response to market developments or adverse investor perception. The Fund could lose money if it cannot sell a security at the time and price that would be most beneficial to the Fund.

Market   Stock prices are volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods.

Other Investment Companies  The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Fund may invest in other investment companies, you will pay a proportionate share of the expenses of that other investment company (including management fees, administration fees and custodial fees) in addition to the expenses of the Fund.

Securities Lending  Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Fund will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Fund will lose money due to the failure of a borrower to return a borrowed security in a timely manner.

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

PERFORMANCE INFORMATION

The following information is intended to help you understand the risks of investing in the Fund. The following bar chart and table show the changes in the Fund’s performance from year to year, and the table compares the Fund’s performance to the performance of a broad-based securities market index/indices for the same period. The Fund’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. The bar chart shows the performance of the Fund’s Class A shares, but does not reflect the impact of sales charges. If it did, returns would be lower than those shown. Other class shares performance would be higher than Class A shares performance because of the higher expenses paid by Class A shares. The Fund’s past performance (before and after taxes) is no guarantee of future results. For the most recent performance figures, go to www.INGFunds.com/literature or call 1-800-992-0180.

Calendar Year Total Returns Class A (as of December 31 of each year)

Best quarter: 2nd, 2009, 27.84% and Worst quarter: 3rd, 2008, (19.86)%

Average Annual Total Returns%
(for the periods ended December 31, 2009)

		1 Yr	5 Yrs (or since inception)	10 Yrs	Inception Date
Class A before taxes	%	23.31	(1.87)	N/A	12/21/05
After tax on distributions	%	23.18	(2.87)	N/A	—
After tax on distributions with sale	%	15.80	(1.74)	N/A	—
MSCI EAFE® Index 1	%	31.78	1.182	N/A	—
Class B before taxes	%	24.99	(2.65)	N/A	01/12/06
MSCI EAFE® Index 1	%	31.78	1.182	N/A	—
Class C before taxes	%	28.96	(2.05)	N/A	01/12/06
MSCI EAFE® Index 1	%	31.78	1.182	N/A	—
Class I before taxes	%	31.04	0.13	N/A	12/21/05
MSCI EAFE® Index 1	%	31.78	1.182	N/A	—
Class O before taxes	%	31.10	(13.63)	N/A	11/09/07
MSCI EAFE® Index 1	%	31.78	(14.88)2	N/A	—

1	The index returns include the reinvestment of dividends and distributions net of withholding taxes, but do not reflect fees, brokerage commissions or other expenses.
2	Reflects index performance since the date closest to the Class’ inception for which data is available.

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, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. In some cases the after-tax returns may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period. After-tax returns are shown for Class A shares only. After-tax returns for other classes will vary.

PORTFOLIO MANAGEMENT

Prior to June 30, 2010 the Fund is managed by the following Investment Adviser, Sub-Adviser and Portfolio Managers:

Investment Adviser	Sub-Adviser
ING Investments, LLC	ING Investment Management Advisors B.V.

Summary Prospectus February 26, 2010, as supplemented June 1, 2010 3 of 4 ING Index Plus International Equity Fund

Portfolio Managers
Martin Jansen	Carl Ghielen
Portfolio Manager (since 12/05)	Portfolio Manager (since 05/12)

Effective June 30, 2010 the Fund is managed by the following Investment Adviser, Sub-Adviser and Portfolio Managers:

Investment Adviser	Sub-Adviser
ING Investments, LLC	ING Investment Management Co.

Portfolio Managers
Martin Jansen	Vincent Costa
Portfolio Manager (since 12/05)	Portfolio Manager (since 06/10)
Pranay Gupta
Portfolio Manager (since 06/10)

PURCHASE AND SALE OF FUND SHARES

Shares of the Fund may be purchased or sold on any business day (normally any day when the New York Stock Exchange is open). Generally, purchase and redemption orders for Fund shares are processed at the net asset value next calculated after an order is received by the Fund’s distributor, ING Funds Distributor, LLC. You can buy or sell shares of the Fund through a broker-dealer or other financial intermediary; by visiting our website at www.ingfunds.com; by writing to us at ING Funds; 7337 East Doubletree Ranch Road, Scottsdale, Arizona 85258; or by calling us at 1-800-992-0180.

Minimum Initial Investment $ by share class

		A,B,C	I	O
Non-retirement accounts	$	1,000	250,000	1,000
Retirement accounts	$	250	250,000	250
Certain omnibus accounts	$	250	—	—
Pre-Authorized Investment Plan	$	1,000	—	1,000

There are no minimums for additional investments except that the Pre-Authorized Investment Plan requires a monthly investment of at least $100. For Class O shares, if you are unable to invest at least $1,000 ($250 for retirement accounts/ESAs), you may open your account for $100 and $100 per month using the Automatic Investment Plan. This allows you to invest regular amounts at regular intervals until you reach the required initial minimum.

TAX INFORMATION

The Fund intends to make distributions that 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 Web site for more information.

Summary Prospectus February 26, 2010, as supplemented June 1, 2010 4 of 4 SPRO-IPINTEQ (0610-060110)