AFFILIATED MANAGERS GROUP, INC.
LONG-TERM EXECUTIVE INCENTIVE PLAN

        1.     PURPOSE. This Plan is intended to create incentives to allow the Company to attract and retain executive officers who will contribute to increases in stockholder value, and that Awards made under this Plan be used to achieve the objectives of (i) aligning executive incentive compensation with such increases in stockholder value, and (ii) using deferred incentive compensation as a tool to retain key employees. It is the intent of the Company that compensation payable under this Plan shall qualify as performance-based compensation within the meaning of Section 162(m) of the Code.

        2.     DEFINITIONS. Capitalized terms not otherwise defined herein shall have the meanings set forth below:

        (a)   "AWARD" shall mean, for any Participant, that percentage of an Incentive Pool granted by the Committee to the Participant pursuant to Section 5.2.

        (b)   "BASE CASH NET INCOME" for any fiscal year shall mean the Company's Cash Net Income, less the after-tax impact of such Performance Fees as the Committee may determine.

        (c)   "BASE CASH EARNINGS PER SHARE" for any fiscal year shall mean Base Cash Net Income, divided by the adjusted diluted average number of Shares during the fiscal year calculated in a manner consistent with the Company's presentation of cash earnings per share in its financial disclosures for such fiscal year.

        (d)   "CASH NET INCOME" for any fiscal year shall mean the Company's cash net income calculated in a manner consistent with the Company's presentation of such measure in its financial disclosures for such fiscal year.

        (e)   "CODE" shall mean the Internal Revenue Code of 1986, as amended.

        (f)    "COMMITTEE" shall mean those members of the Compensation Committee of the Board of Directors of the Company who are "outside directors" and "non-employee directors "as such terms are defined under the Code and applicable regulations and Rule 16b-3 promulgated under the Securities Exchange Act of 1934, as amended, respectively. If the Compensation Committee includes members who are not outside directors or non-employee directors, as so defined, it shall act with respect to this Plan without the participation of such nonqualifying members, and all references herein to the Committee shall be deemed to refer to the Compensation Committee so acting.

        (g)   "COMPANY" shall mean Affiliated Managers Group, Inc.

        (h)   "FISCAL YEAR" shall mean the fiscal year of the Company, which is the calendar year.

        (i)    "INCENTIVE POOL" shall mean, with respect to any Performance Period, the total amount available for Awards for such Performance Period as determined in accordance with Section 6.1.

        (j)    "PARTICIPANT" shall mean an executive officer designated by the Committee pursuant to Section 4 to participate herein with respect to a Performance Period.

        (k)   "PERFORMANCE FEES" shall mean, with respect to any Performance Period, those fee revenues determined by the Committee to be non-recurring in nature and not appropriate for inclusion in Base Cash Net Income.

        (l)    "PERFORMANCE MEASURE" for any Performance Period shall mean Base Cash Earnings per Share meeting the target level set by the Committee for such Performance Period.

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        (m)  "PERFORMANCE PERIOD" shall mean each fiscal year of the Company.

        (n)   "PLAN" shall mean the Affiliated Managers Group, Inc. Long-Term Executive Incentive Plan, as amended from time to time.

        (o)   "PRE-TAX CASH NET INCOME" for any fiscal year shall mean the Company's Cash Net Income plus any component of consolidated income tax expense used to calculate Cash Net Income for such fiscal year.

        (p)   "SHARE" shall mean a share of the common stock, par value $.01 per share, of the Company.

        (q)   "STOCK PLAN" shall mean any authorized stock plan of the Company.

        (r)   "TRUST" shall mean any trust established pursuant to a trust agreement between the Company and a trustee, or any similar or successor trust, under which Awards may be paid pursuant to Section 6.4 of this Plan.

        3.     ADMINISTRATION. Subject to Section 15, the Committee shall have sole discretionary power to interpret the provisions of this Plan, to administer and make all decisions and exercise all rights of the Company with respect to this Plan. The Committee shall have final authority to apply the provisions of the Plan and determine, in its sole discretion, the amount of the Incentive Pool and Awards to be paid or allocated to Participants hereunder and shall also have the exclusive discretionary authority to make all other determinations (including, without limitation, the interpretation and construction of the Plan and the determination of relevant facts) regarding the entitlement to benefits hereunder and the amount of benefits to be paid from the Plan. The Committee's exercise of this discretionary authority shall at all times be in accordance with the terms of the Plan and shall be entitled to deference upon review by any court, agency or other entity empowered to review its decision, and shall be enforced provided that it is not arbitrary, capricious or fraudulent.

        4.     ELIGIBILITY. For each Performance Period, the Committee in its discretion shall select those executive officers who shall be Participants. The selection of an individual to be a Participant in any one Performance Period does not entitle the individual to be a Participant in any other Performance Period.

        5.     PERFORMANCE MEASURE AND AWARDS.

        5.1   PERFORMANCE MEASURE. Within the first 90 days of a Performance Period, the Committee shall establish the target amount of Base Cash Earnings per Share and the formula for determining the size of the Incentive Pool for such Performance Period, which target amount and formula shall be set forth in the minutes of the meetings of the Committee. The size of the Incentive Pool shall be determined by reference to growth in the Company's Pre-Tax Cash Net Income.

        5.2   GRANTING OF AWARDS. Within the period of time prescribed by Section 162(m) of the Code and the regulations promulgated thereunder, the Committee may grant to any Participant an Award representing a percentage of the Incentive Pool to be determined for such Performance Period. In no event shall Awards representing more than 100 percent of an Incentive Pool be granted to Participants; nor shall the Award for any individual Participant exceed five percent of the Company's Pre-Tax Cash Net Income. The Committee shall notify each Participant of the grant of an Award in such manner as it shall deem appropriate. The Award to each Participant shall be set forth in the minutes of the meetings of the Committee.

        5.3   NATURE OF AWARDS. The Awards granted under this Plan shall be used solely as a device for the measurement and determination of certain compensation to be paid to each Participant as provided herein. Awards shall not constitute or be treated as property or as a trust fund of any kind or as capital stock of the Company, stock options or other form of equity or security until they are paid out in the form of cash or Shares.

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        6.     VALUATION OF INCENTIVE POOL AND PAYMENTS.

        6.1   VALUATION. If at the end of a Performance Period, the Performance Measure for such Performance Period has been attained, the total value of the Incentive Pool for the Performance Period shall be determined based upon the formula adopted by the Committee for such Performance Period. The value of each Participant's Award shall be equal to the percentage of the Incentive Pool represented by such Award which has been allocated to him or her for the Performance Period.

        6.2   COMMITTEE CERTIFICATION. No Participant shall receive any cash or Shares under this Plan unless the Committee has certified, by resolution or other appropriate action in writing, that the amount of the Incentive Pool has been accurately determined in accordance with the terms, conditions and limits of the Plan and that the Performance Measure has in fact been satisfied. The Committee shall have the discretion to reduce the size of the Incentive Pool or the size of any individual Award, but the Committee may not, however, increase the maximum amount permitted to be paid to any Participant under Section 5.2 of this Plan, increase the size of any individual Award or authorize the payment of cash or Shares under this Plan if the Performance Measure has not been satisfied.

        6.3   PAYMENTS TO PARTICIPANTS. Once the value of the Incentive Pool is determined pursuant to Section 6.1 and certified by the Committee in accordance with Section 6.2, and once attainment of the Performance Measure has also been so certified, and subject to the provisions of Section 10, a Participant shall be paid his or her Award in cash or Shares. To the extent the Award is payable in Shares, it shall be made from Shares reserved under a Stock Plan.

        6.4   DEFERRAL OF PAYMENTS. Notwithstanding the foregoing, the Committee reserves the right to defer payment of Awards to Participants, subject to such terms and provisions as the Committee may determine (including additional time-based vesting), through the Trust or otherwise, consistent with its intention to employ long-term incentive award arrangements in which the value of awards may be directly tied to the value of the Company's common stock. Any such deferral shall be designed to comply with the requirements of Section 409A of the Code to the extent applicable. Any portion of the Awards set aside in the Trust shall be subject to and accordance with the terms of the Trust.

        7.     FORFEITURE. A Participant whose employment with the Company terminates for any reason prior to payment of an Award (including payment to the Trust) or prior to fulfilling the vesting requirements for his or her deferred Award hereunder shall forfeit all rights to the Award which might otherwise have been granted to him or her, or the deferred Award, as the case may be. The Committee may allocate part or all of an Award forfeited prior to the completion of the Performance Period to one or more executives not presently designated as Participants, including newly hired executives. In accordance with the terms of the Trust, forfeitures of Awards that occur after the payment of an Award to the Trust will be allocated to other Participants. In no event shall the reallocation of any forfeited Award or portion thereof result in any increase in any other Award intended to satisfy the performance-based exception requirements of Section 162(m) of the Code.

        8.     AMENDMENT OR TERMINATION OF PLAN. The Company may amend or terminate this Plan at any time or from time to time; provided, however, that no such amendment or termination shall, without the written consent of the Participants, in any material adverse way affect the rights of a Participant with respect to benefits earned prior to the date of amendment or termination.

        9.     LIMITATION OF COMPANY'S LIABILITY. Subject to its obligation to make payments as provided for hereunder, neither the Company nor any person acting on behalf of the Company shall be liable for any act performed or the failure to perform any act with respect to this Plan, except in the event that there has been a judicial determination of willful misconduct on the part of the Company or such person. The Company is under no obligation to fund any of the payments required to be made hereunder in advance of their actual payment or to establish any reserves with respect to this Plan. Any benefits which become payable hereunder shall be paid from the general assets of the Company. No Participant, or his or

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her beneficiary or beneficiaries, shall have any right, other than the right of an unsecured general creditor, against the Company in respect of the benefits to be paid hereunder.

        10.   WITHHOLDING OF TAX. Anything to the contrary notwithstanding, all payments required to be made by the Company hereunder shall be subject to the withholding of such amounts as the Company reasonably may determine that it is required to withhold pursuant to applicable federal, state or local law or regulation. Withholding can be made in the form of Shares, if the Committee so determines.

        11.   ASSIGNABILITY. Except as otherwise provided by law, no benefit hereunder shall be assignable, or subject to alienation, garnishment, execution or levy of any kind, and any attempt to cause any benefit to be so subject shall be void.

        12.   NO CONTRACT FOR CONTINUING SERVICES. This Plan shall not be construed as creating any contract for continued services between the Company and any Participant and nothing herein contained shall give any Participant the right to be retained as an employee of the Company.

        13.   GOVERNING LAW. This Plan shall be construed, administered, and enforced in accordance with the laws of the Commonwealth of Massachusetts.

        14.   NON-EXCLUSIVITY. Subject to Section 15, the Plan does not limit the authority of the Company, the Committee, or any subsidiary of the Company, to grant awards or authorize any other compensation under any other plan or authority, including, without limitation, awards or other compensation based on the same Performance Measure used under the Plan. In addition, executives not selected to participate in the Plan may participate in other plans of the Company.

        15.   SECTION 162(M) CONDITIONS; BIFURCATION OF PLAN. It is the intent of the Company that the Plan and Awards made hereunder satisfy and be interpreted in a manner, that, in the case of Participants who are or may be persons whose compensation is subject to Section 162(m), satisfies any applicable requirements as performance-based compensation. Any provision, application or interpretation of the Plan inconsistent with this intent to satisfy the standards in Section 162(m) of the Code shall be disregarded. Notwithstanding anything to the contrary in the Plan, the provisions of the Plan may at any time be bifurcated by the Committee in any manner so that certain provisions of the Plan intended (or required in order) to satisfy the applicable requirements of Section 162(m) are applicable only to persons whose compensation is subject to Section 162(m).

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