Summary Prospectus December 15, 2010

Natixis Oakmark International Fund

Ticker Symbol: Class A (NOIAX) and Class C (NOICX)

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 ga.natixis.com/funddocuments. You can also get this information at no cost by calling 800-225-5478 or by sending an e-mail request to NatixisFunds@ga.natixis.com. The Fund’s Prospectus and Statement of Additional Information, each dated December 15, 2010 are incorporated by reference into this Summary Prospectus.

Investment Goal

The Fund seeks long-term capital appreciation.

Fund Fees & Expenses

The following 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 $50,000 in the Natixis Fund Complex. More information about these and other discounts is available from your financial professional and in the section “How Sales Charges Are Calculated” on page 14 of the Prospectus and on page 64 in the section “Reduced Sales Charges” of the Statement of Additional Information (“SAI”).

Shareholder Fees (fees paid directly from your investment)	Class A			Class C
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)		5.75	%		None
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, as applicable)		None			1.00	%
Redemption fees		None			None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)	Class A			Class C
Management fees		0.85	%		0.85	%
Distribution and/or service (12b-1) fees		0.25	%		1.00	%
Other expenses (estimated for the current fiscal year)		0.47	%		0.47	%
Total annual fund operating expenses		1.57	%		2.32	%
Fee waiver and/or expense reimbursement1		0.12	%		0.12	%
Total annual fund operating expenses after fee waiver and/or expense reimbursement		1.45	%		2.20	%

Example

This 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 and then redeem all of your shares at the end of those periods (except where indicated). The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, except that the example is based on Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement for the first seventeen months and on the Total Annual Fund Operating Expenses for the remaining periods. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

	Class A		Class C
			If shares are redeemed		If shares are not redeemed
1 year	$	714	$	323	$	223
3 years	$	1,027	$	709	$	709

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1 The Fund’s investment adviser has given a binding contractual undertaking to the Fund to limit the amount of the Fund’s total annual fund operating expenses to 1.45% and 2.20% of the Fund’s average daily net assets for Class A and C shares, respectively, exclusive of brokerage expenses, interest expense, taxes, organizational and extraordinary expenses, such as litigation and indemnification expenses. This undertaking is in effect through April 30, 2012 and may be terminated before then only with the consent of the Fund’s Board of Trustees. The Fund’s investment adviser will be permitted to recover, on a class by class basis, management fees waived and/or expenses reimbursed to the extent that expenses in later periods fall below 1.45% and 2.20% of the Fund’s average daily net assets for Class A and C shares, respectively. The Fund will not be obligated to repay any such waived/reimbursed fees and expenses more than one year after the end of the fiscal year in which the fees or expenses were waived/reimbursed.

Portfolio Turnover

The Fund will 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 for you if your 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.

Investments, Risks and Performance

Principal Investment Strategies

The Fund invests primarily in a diversified portfolio of common stocks of non-U.S. companies. The Fund may invest in non-U.S. markets throughout the world, including emerging markets. Ordinarily, the Fund will invest in the securities of at least five countries outside the U.S. There are no geographic limits on the Fund’s non-U.S. investments, but the Fund does not expect to invest more than 35% of its total assets in securities of companies based in emerging markets. Although the Fund invests primarily in common stocks of non-U.S. companies it may also invest in the securities of U.S. companies. The Fund may invest in the securities of small-, mid- and large capitalization companies.

The Fund’s subadviser, Harris Associates L.P. (“Harris Associates”), uses a value investment philosophy in selecting equity securities, such as common stocks, preferred stocks, warrants, and securities convertible into common stocks and preferred stocks. This investment philosophy is based upon the belief that, over time, a company’s stock price converges with the company’s intrinsic or true business value. By “true business value,” Harris Associates means its estimate of the price a knowledgeable buyer would pay to acquire the entire business. Harris Associates believes that investing in securities priced significantly below their true business value presents the best opportunity to achieve the Fund’s investment objective.

Harris Associates uses this value philosophy to identify companies that it believes have discounted stock prices compared to the companies’ true business values. In assessing such companies, Harris Associates looks for the following characteristics, although not all of the companies selected will have these attributes: (1) free cash flows and intelligent investment of excess cash; (2) earnings that are growing and are reasonably predictable; and (3) high level of manager ownership.

Once Harris Associates determines that a stock is selling at what it believes to be a significant discount and that the company has the additional qualities mentioned above, Harris Associates generally will consider buying that stock for the Fund. Harris Associates usually sells a stock when the price approaches its estimated worth. Harris Associates also monitors each holding and adjusts those price targets as warranted to reflect changes in the company’s fundamentals. The Fund’s portfolio typically holds 30 to 65 stocks.

Principal Risks

The principal risks of investing in the Fund are summarized below. The Fund does not represent a complete investment program. You may lose money by investing in the Fund.

Currency Risk: Fluctuations in the exchange rates between different currencies may negatively affect an investment. The Fund may hedge its exposure to foreign currencies.

Emerging Markets Risk: Investing in emerging markets companies, which may be smaller and have shorter operating histories than companies in developed markets, involves risks in addition to, and greater than, those generally associated with investing in companies in developed foreign markets. The extent of economic development, political stability, market depth, infrastructure, capitalization and regulatory oversight in emerging market economies is generally less than in more developed markets.

Equity Securities Risk: The value of the Fund’s investments in equity securities could be subject to unpredictable declines in the value of individual securities and periods of below-average performance in individual securities or in the equity market as a whole. Small-capitalization and mid-capitalization companies may be subject to more abrupt price movements, limited markets and less liquidity than larger, more established companies, which could adversely affect the value of the Fund’s portfolio. Value stocks can perform differently from the market as a whole and from other types of stocks. Value stocks also present the risk that their lower valuations fairly reflect their business prospects and that investors will not agree that the stocks represent favorable investment opportunities, and they may fall out of favor with investors and underperform growth stocks during any given period. In the event an issuer is liquidated or declares bankruptcy, the claims of owners of the issuer’s bonds and preferred stock generally take precedence over the claims of those who own common stock.

Focused Investment Risk: Because the Fund may invest in a small number of industries or securities, it may have more risk because the impact of a single economic, political or regulatory occurrence may have a greater adverse impact on the Fund’s net asset value.

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Foreign Securities Risk: The Fund’s investments in foreign securities are subject to foreign currency fluctuations. Foreign securities may be subject to higher volatility than U.S. securities, varying degrees of regulation and limited liquidity. Greater political, economic, credit and information risks also are associated with foreign securities.

Management Risk: A strategy used by the Fund’s portfolio managers may fail to produce the intended result.

Market Risk: The market value of a security will move up and down, sometimes rapidly and unpredictably, based upon a change in an issuer’s financial condition, as well as overall market and economic conditions.

Risk/Return Bar Chart and Table

Because the Fund is new and has not yet commenced operations, information related to the Fund’s performance, including a bar chart showing annual returns, has not been included in this Prospectus. The performance information provided by the Fund in the future will give some indication of the risks of an investment 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 compare against those of a broad measure of market performance.

Management

Investment Adviser

Natixis Asset Management Advisors, L.P.

Investment Subadviser

Harris Associates L.P.

Portfolio Managers

David G. Herro, CFA, Chief Investment Officer of International Equity, Vice President and portfolio manager of Harris Associates, has served as co-portfolio manager of the Fund since December 2010.

Robert A. Taylor, CFA, Director of International Research, Vice President and portfolio manager of Harris Associates, has served as co-portfolio manager of the Fund since December 2010.

Purchase and Sale of Fund Shares

The following chart shows the investment minimums for various types of accounts:

Type of Account	Minimum Initial Purchase		Minimum Subsequent Purchase
Any account other than those listed below	$	2,500	$	100
For shareholders participating in Natixis Funds’ Investment Builder Program	$	1,000	$	50
For Traditional IRA, Roth IRA, Rollover IRA, SEP-IRA and Keogh plans using the Natixis Funds’ prototype document (direct accounts, not held through intermediary)	$	1,000	$	100
Coverdell Education Savings Accounts	$	500	$	100

The Fund’s shares are available for purchase (and are redeemable on any business day) through your investment dealer, directly from the Fund by writing to the Fund at Natixis Funds, P.O. Box 219579, Kansas City, MO 64121-9579, by exchange, by wire, through the Automated Clearing House system, or, in the case of redemptions, by telephone at 800-225-5478 or by the Systematic Withdrawal Plan.

Tax Information

Fund distributions are generally taxable to you as ordinary income or capital gain, except for distributions to retirement plans and other investors that qualify for tax-exempt treatment under U.S. federal income tax law generally.

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 the 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.

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UOI77-1210