CERTIFICATION PURSUANT TO SECTION 302(a) OF THE SARBANES-OXLEY ACT OF 2002
I, Jay C. Horgen, certify that:
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| 1. | I have reviewed this Annual Report on Form 10-K/A of Affiliated Managers Group, Inc.; and |
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| 2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report. |
Date: March 29, 2018
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| | | /s/ JAY C. HORGEN |
| | | Jay C. Horgen |
| | | Chief Financial Officer and Treasurer |
