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

Nov 1, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AFFILIATED MANAGERS GROUP INC (AMG)
CIK: 0001004434
Period of Report: 2010-10-28

Reporting Person: NUTT WILLIAM J (Director, Chairman)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-10-28	Common Stock	M	50000	$31.96	Acquired	387991	Direct
2010-10-28	Common Stock	S	50000	$86.94	Disposed	387991	Direct
2010-10-29	Common Stock	M	36871	$31.96	Acquired	387991	Direct
2010-10-29	Common Stock	M	13129	$44.35	Acquired	387991	Direct
2010-10-29	Common Stock	S	50000	$86.33	Disposed	387991	Direct
2010-11-01	Common Stock	M	50000	$44.35	Acquired	387991	Direct
2010-11-01	Common Stock	S	50000	$86.78	Disposed	387991	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-10-28	Employee Stock Option (Right to Buy)	$31.96	M	50000	Disposed	2010-12-19	Common Stock (50000)	Direct
2010-10-29	Employee Stock Option (Right to Buy)	$31.96	M	36871	Disposed	2010-12-19	Common Stock (36871)	Direct
2010-10-29	Employee Stock Option (Right to Buy)	$44.35	M	13129	Disposed	2010-12-10	Common Stock (13129)	Direct
2010-11-01	Employee Stock Option (Right to Buy)	$44.35	M	50000	Disposed	2010-12-10	Common Stock (50000)	Direct

Footnotes

F1: The sale price reflects the weighted average price of the shares sold; the individual transaction prices ranged from $86.79 to $87.35. 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 $85.06 to $87.99. 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 $85.70 to $87.15. Specific details will be provided to the SEC upon request.