AFFILIATED MANAGERS GROUP, INC. — Director's Dealing 2010

May 4, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AFFILIATED MANAGERS GROUP INC (AMG)
CIK: 0001004434
Period of Report: 2010-05-03

Reporting Person: KINGSTON JOHN III (Exec. V.P., Gen. Counsel)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-05-03	Common Stock	M	30000	$43.50	Acquired	20000	Direct
2010-05-03	Common Stock	M	45081	$44.35	Acquired	20000	Direct
2010-05-03	Common Stock	S	67500	$85.05	Disposed	20000	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-05-03	Employee Stock Option (Right to Buy)	$43.50	M	30000	Disposed	2013-07-24	Common Stock (30000)	Direct
2010-05-03	Employee Stock Option (Right to Buy)	$44.35	M	45081	Disposed	2013-12-10	Common Stock (45081)	Direct

Footnotes

F1: The reported amount is the weighted average sales price of the shares sold; the individual transaction prices ranged from $84.60 to $85.35. Specific transaction details will be provided to the SEC upon request.