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: KINGSTON JOHN III (Vice Chairman & Gen. Counsel)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-04-28	Common Stock	M	14919	$44.35	Acquired	19878	Direct
2011-04-28	Common Stock	M	15000	$45.27	Acquired	19878	Direct
2011-04-28	Common Stock	S	29919	$109.01	Disposed	19878	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-04-28	Employee Stock Option (Right to Buy)	$44.35	M	14919	Disposed	2013-12-10	Common Stock (14919)	Direct
2011-04-28	Employee Stock Option (Right to Buy)	$45.27	M	15000	Disposed	2014-07-27	Common Stock (15000)	Direct

Footnotes

F1: The sale reflects the weighted average sales price of the shares sold; the individual transaction prices ranged from $108.89 to $109.11. Specific transaction details will be provided to the SEC upon request.