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

Feb 18, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AFFILIATED MANAGERS GROUP INC (AMG)
CIK: 0001004434
Period of Report: 2011-02-17

Reporting Person: Horgen Jay C. (Executive Vice President)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-02-17	Common Stock	M	40000	$48.38	Acquired	3137	Direct
2011-02-17	Common Stock	S	40000	$111.26	Disposed	3137	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-02-17	Employee Stock Option (Right to Buy)	$48.38	M	40000	Disposed	2015-11-03	Common Stock (40000)	Direct

Footnotes

F1: The sale price reflects the weighted average sales price of the shares sold; the individual transaction prices ranged from $111.18 to $111.47. Specific transaction details will be provided to the SEC upon request.