AFFILIATED MANAGERS GROUP, INC. — Director's Dealing 2011

May 2, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AFFILIATED MANAGERS GROUP INC (AMG)
CIK: 0001004434
Period of Report: 2011-04-28

Reporting Person: HEALEY SEAN M (Director, CEO and Chairman)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-04-28	Common Stock	M	45000	$45.27	Acquired	46833	Direct
2011-04-28	Common Stock	S	58607	$109.33	Disposed	46833	Direct
2011-04-29	Common Stock	M	50000	$45.27	Acquired	46833	Direct
2011-04-29	Common Stock	S	50000	$109.27	Disposed	46833	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-04-28	Employee Stock Option (Right to Buy)	$45.27	M	45000	Disposed	2014-07-27	Common Stock (45000)	Direct
2011-04-29	Employee Stock Option (Right to Buy)	$45.27	M	50000	Disposed	2014-07-27	Common Stock (50000)	Direct

Footnotes

F1: The sale price reflects the weighted average sales price of the shares sold; the individual transaction prices ranged from $109.00 to $110.43. Specific transaction details will be provided to the SEC upon request.

F2: The sale price reflects the weighted average sales price of the shares sold; the individual transaction prices ranged from $108.93 to $109.54. Specific transaction details will be provided to the SEC upon request.