Exhibit 31.3
CERTIFICATION PURSUANT TO SECTION 302(a) OF THE SARBANES-OXLEY ACT OF 2002
I, Sean M. Healey, certify that:
| 1. | I have reviewed this Annual Report on Form 10-K/A of Affiliated Managers Group, Inc.; and |
| 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 28, 2014
/s/ SEAN M. HEALEY
Sean M. Healey
Chief Executive Officer and Chairman