Exhibit 31.4
CERTIFICATION PURSUANT TO SECTION 302(a) OF THE SARBANES-OXLEY ACT OF 2002
I, Jay C. Horgen, 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/ JAY C. HORGEN
Jay C. Horgen
Chief Financial Officer and Treasurer