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

Aug 2, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AFFILIATED MANAGERS GROUP INC (AMG)
CIK: 0001004434
Period of Report: 2010-07-29

Reporting Person: NUTT WILLIAM J (Director, Chairman)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-07-29	Common Stock	M	40000	$35.42	Acquired	387991	Direct
2010-07-29	Common Stock	S	28000	$71.63	Disposed	387991	Direct
2010-07-30	Common Stock	M	40000	$35.42	Acquired	387991	Direct
2010-07-30	Common Stock	S	28000	$70.81	Disposed	387991	Direct
2010-08-02	Common Stock	M	40000	$35.42	Acquired	387991	Direct
2010-08-02	Common Stock	S	28000	$72.66	Disposed	387991	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-07-29	Employee Stock Option (Right to Buy)	$35.42	M	40000	Disposed	2010-08-14	Common Stock (40000)	Direct
2010-07-30	Employee Stock Option (Right to Buy)	$35.42	M	40000	Disposed	2010-08-14	Common Stock (40000)	Direct
2010-08-02	Employee Stock Option (Right to Buy)	$35.42	M	40000	Disposed	2010-08-14	Common Stock (40000)	Direct

Footnotes

F1: The sale price reflects the weighted average price of the shares sold; the individual transaction prices ranged from $71.14 to $72.12. Specific details will be provided to the SEC upon request.

F2: The sale price reflects the weighted average price of the shares sold; the individual transaction prices ranged from $70.37 to $71.34. Specific details will be provided to the SEC upon request.

F3: The sale price reflects the weighted average price of the shares sold; the individual transaction prices ranged from $71.52 to $73.26. Specific details will be provided to the SEC upon request.