UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-K

CURRENT REPORT PURSUANT

TO SECTION 13 OR 15(D) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of report (Date of earliest event reported)  February 1, 2010

Affiliated Managers Group, Inc.

(Exact Name of Registrant as Specified in Its Charter)

Delaware

(State or Other Jurisdiction of Incorporation)

(617) 747-3300

(Registrant’s Telephone Number, Including Area Code)

N/A

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

o            Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o            Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o            Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o            Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

ITEM 2.02             Results of Operations and Financial Conditions.

On February 1, 2010, Affiliated Managers Group, Inc. (the “Company”) issued a press release setting forth its financial and operating results for the quarter and year ended December 31, 2009.  A copy of this press release is furnished as Exhibit 99.1 hereto and is hereby incorporated by reference herein.

ITEM 8.01             Other Events.

The financial statement tables set forth in the press release issued by the Company on February 1, 2010 are also filed as Exhibit 99.2 hereto and are hereby incorporated by reference herein.

ITEM 9.01             Financial Statements and Exhibits.

(c)             Exhibits.

*  This exhibit shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, or otherwise subject to the liability of that section, nor shall it be incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

EXHIBIT INDEX

*  This exhibit shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, or otherwise subject to the liability of that section, nor shall it be incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934.

Exhibit 99.1

AMG Reports Financial and Operating Results

for the Fourth Quarter and Full Year 2009

Company Reports Cash EPS of $1.36; EPS of $0.55 for Fourth Quarter,

Cash EPS of $4.37, EPS of $1.38 for Full Year 2009

BOSTON, February 1, 2010 — Affiliated Managers Group, Inc. (NYSE: AMG) today reported its financial and operating results for the fourth quarter and full year 2009.

For the fourth quarter of 2009, Cash Earnings Per Share (“Cash EPS”) were $1.36, compared to $1.32 for the same period of 2008, while diluted earnings per share for the fourth quarter of 2009 were $0.55, compared to $(2.12) for the same period of 2008.  For the fourth quarter of 2009, Cash Net Income was $60.0 million, compared to $52.3 million for the same period of 2008.  For the fourth quarter of 2009, Net Income was $24.6 million, compared to $(83.7) million for the same period of 2008.  (Cash EPS and Cash Net Income are defined in the attached tables.)

For the fourth quarter of 2009, revenue was $244.7 million, compared to $223.4 million for the same period of 2008.  For the fourth quarter of 2009, EBITDA was $79.9 million, compared to $54.9 million for the same period of 2008.

For the year ended December 31, 2009, Cash Net Income was $185.7 million, while EBITDA was $242.8 million.  For the same period, Net Income was $59.5 million, on revenue of $841.8 million.  For the year ended December 31, 2008, Cash Net Income was $225.4 million, while EBITDA was $309.0 million.  For the same period, Net Income was $(1.3) million, on revenue of $1,158.2 million.

Net client cash flows for the fourth quarter of 2009 were approximately $(780) million.  Pro forma for pending investments, the aggregate assets under management of AMG’s affiliated investment management firms were approximately $231 billion at December 31, 2009.

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“AMG’s results for the fourth quarter and full year 2009 reflect the quality and diversity of our Affiliates, and with their outstanding relative investment performance and increasingly global profile, we are well positioned for strong earnings growth,” stated Sean M. Healey, President and Chief Executive Officer of AMG.  “Over the course of the year, we made excellent progress across all elements of our growth strategy, through the performance of our key Affiliates and the continued expansion of our global distribution platform, as well as the successful addition of outstanding new Affiliates.  Looking ahead, we are confident in our prospects for maximizing shareholder returns in 2010.”

Mr. Healey continued, “Our Affiliates generally produced excellent investment performance in the quarter, with our global and international equity and alternative managers delivering especially strong results for their clients. For example, the flagship strategies at Tweedy, Browne and Genesis produced outstanding performance relative to their benchmarks, with Tweedy’s Global Value Fund ranking first in its Lipper and Morningstar categories.  Together with outstanding international equity strategies from Affiliates such as AQR, Harding Loevner, Third Avenue, and Beutel Goodman, global equity products contributed over 40% of our EBITDA in the quarter.  Among domestic managers, value strategies from Third Avenue and Systematic, and growth products from Frontier and TimesSquare extended their strong track records.  Finally, in the alternative space, AQR and BlueMountain generated good performance in the quarter across a wide range of their absolute return products, positioning them very well for 2010.”

“Consistent with broader industry trends, inflows to our Affiliates’ global and international equity products were offset by outflows from U.S. equities.  However, our overall client cash flow trends continue to improve, and we have been pleased to see a number of recent mandate wins through our global distribution platforms in Australia, Europe, and the Middle East, as well as increasing search volumes in global equities and alternatives.  With our Affiliates’ excellent track records of investment performance, especially among our global equity and alternative products, we are well positioned for accelerating organic growth as institutional and retail investors reallocate to return-oriented assets.”

Mr. Healey added, “Finally, we are extremely pleased with the successful execution of our New Investments strategy in 2009 and thus far in 2010, with the announcement today of our investment in Artemis Investment Management.  In 2009, we were pleased to partner with three outstanding managers — global and emerging markets equity manager Harding Loevner; Value Partners, which extended AMG’s global presence into the Asian marketplace; and manager-of-managers Aston Asset Management.  Consistent with our strategic focus, these investments increased AMG’s exposure to the fastest-growing and most attractive areas of the industry, including the global, international, and alternative segments.  Our newest investment further supports our strategic objectives.  Artemis is a leading $16 billion UK-based investment manager with one of the most highly regarded brands in the United Kingdom among retail and institutional investors.  We are very pleased to welcome our newest Affiliate, which will bring our EBITDA contribution from global and international equity products to approximately 45%.”

Mr. Healey concluded, “We see ongoing opportunities ahead for continued growth through the execution of our New Investments strategy.  Our pipeline continues to include a diverse array of outstanding traditional and alternative firms based in the U.S. and abroad, and we are uniquely

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positioned to capitalize on these prospects.  Given demographic trends and improving market conditions and asset flows, we will continue to benefit from our reputation as the succession-planning partner of choice among high-quality boutique asset managers globally.  With our substantial financial capacity, we are well positioned to maximize shareholder returns and add materially to our earnings growth through accretive investments in additional new Affiliates.”

About Affiliated Managers Group

AMG is a global asset management company with equity investments in leading boutique investment management firms.  AMG’s innovative partnership approach allows each Affiliate’s management team to own significant equity in their firm while maintaining operational autonomy.  AMG’s strategy is to generate growth through the internal growth of existing Affiliates, as well as through investments in new Affiliates.  In addition, AMG provides centralized assistance to its Affiliates in strategic matters, marketing, distribution, product development and operations.  As of December 31, 2009 (pro forma for pending investments), the aggregate assets under management of AMG’s Affiliates were approximately $231 billion in more than 300 investment products across a broad range of investment styles, asset classes and distribution channels.  For more information, please visit the Company’s website at www.amg.com.

Financial Tables Follow

A teleconference will be held with AMG’s management at 11:00 a.m. Eastern time today.  Parties interested in listening to the teleconference should dial 1-877-407-9210 (domestic calls) or 1-201-689-8049 (international calls) starting at 10:45 a.m. Eastern time.  Those wishing to listen to the teleconference should dial the appropriate number at least ten minutes before the call begins.

The teleconference will also be available for replay beginning approximately one hour after the conclusion of the call.  To hear a replay of the call, please dial 1-877-660-6853 (domestic calls) or 1-201-612-7415 (international calls) and provide account number 286 and conference ID 343510.  The live call and replay of the session, and additional financial information referenced during the teleconference, can also be accessed via the Web at www.amg.com.

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Affiliated Managers Group, Inc.

Financial Highlights

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Affiliated Managers Group, Inc.

Financial Highlights

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Affiliated Managers Group, Inc.

Reconciliations of Earnings Per Share Calculation

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Affiliated Managers Group, Inc.

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Affiliated Managers Group, Inc.

Operating Results

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Assets Under Management

Statement of Changes - Quarter to Date

Statement of Changes - Year to Date

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Operating Results

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Affiliated Managers Group, Inc.

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Affiliated Managers Group, Inc.

Consolidated Statements of Income

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Affiliated Managers Group, Inc.

Consolidated Balance Sheets

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Affiliated Managers Group, Inc.

Consolidated Statements of Cash Flow

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