Amendment to the Seventh Amended and Restated Limited Liability Company Agreement of Acadian Asset Management LLC, dated December 30, 2022

This Amendment (this “Amendment”) dated as of December 30, 2022 to the Seventh Amended and Restated Limited Liability Operating Agreement of Acadian Asset Management LLC (the “Company”), dated as of February 26, 2018 (the “Agreement”), is made and entered into by and between BrightSphere Affiliate Holdings LLC f/k/a OMAM Affiliate Holdings LLC (“BrightSphere”) and Acadian KELP LP (“KELP”). Capitalized expressions not otherwise defined in this Amendment shall have the meanings ascribed to them in the Agreement.

WHEREAS: the Agreement makes references to certain BrightSphere entities which have, following the effective date of the Agreement, changed their legal names, including, OMAM, OM(US)H, and OM Asset Management;

WHEREAS: BrightSphere and the KELP desire to amend the Agreement to reflect the name changes referenced herein;

WHEREAS: Section 6.1(d) of the Agreement provides that, except as otherwise set forth in the Agreement, until December 31, 2022, the approval of a majority of the KELP Managers is required to take certain actions set forth in such Section 6.1(d) (the “KELP Veto Rights”); and

WHEREAS: Section 8.3(c) of the Agreement provides that, until December 31, 2022, the KELP shall have the right to purchase all (or such pro rata share) of the Interests or other assets offered by BSIG or the Company in connection with a Proposed ROFR Sale (the “KELP ROFR Right,” and together with the KELP Veto Rights, the “KELP Rights”); and

WHEREAS: BrightSphere and the KELP desire to amend the Agreement to provide for an extension of the KELP Rights until the earliest of (i) December 31, 2023, (ii) a Liquidity Event, (iii) a sale of BrightSphere Investment Group’s interest in the Company and (iv) a change in control of BrightSphere Investment Group Inc.

NOW THEREFORE, in consideration of the mutual promises and agreements made herein and intending to be legally bound hereby, the parties hereto agree to amend the Agreement as follows:

1.The term “OMAM” shall be deleted and replaced with the term “BrightSphere.”

2.The term “OM(US)H” shall be deleted and replaced with the term “BS Inc.”

3.The term “OM Asset Management” shall be deleted and replaced with the term “BrightSphere Investment Group.”

4.The definition of the term “OM Asset Management” shall be replaced in its entirety with:

““BrightSphere Investment Group” shall mean BrightSphere Investment Group Inc., a     Delaware corporation listed on the New York Stock Exchange”.

5.The first sentence of Section 6.1(d) of the Agreement is hereby replaced in its entirety by the foll    owing:

6.Article XII shall be amended to add the following:

““KELP Rights Expiration Date” shall mean the earliest of (i) December 31, 2023, (ii) the consummation of a Liquidity Event, (iii) a sale of BrightSphere Investment Group Inc.’s interest (directly or indirectly) in the Company and (iv) a change in control of BrightSphere Investment Group Inc.”

7.The first sentence of Section 8.3(c) of the Agreement is hereby replaced in its entirety with the following:

8.As amended by this Amendment, the Agreement constitutes the entire agreement between the parties and supersedes all prior and contemporaneous agreements and understandings of the parties it being understood and agreed, however, that any provisions of the Agreement not expressly amended by this Amendment shall hereupon and hereafter apply and be construed mutatis mutandis after giving effect to all modifications to the Agreement effected by this Amendment.