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: 2011-02-16

Reporting Person: CRATE DARRELL W (Executive V.P. and CFO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-02-16	Common Stock	M	1611	$62.04	Acquired	3111	Direct
2011-02-16	Common Stock	F	700	$111.21	Disposed	3111	Direct
2011-02-16	Common Stock	M	79667	$45.27	Acquired	3111	Direct
2011-02-16	Common Stock	S	100000	$112.10	Disposed	3111	Direct
2011-02-17	Common Stock	M	20333	$45.27	Acquired	3111	Direct
2011-02-17	Common Stock	S	20333	$111.43	Disposed	3111	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-02-16	Employee Stock Option (Right to Buy)	$62.04	M	1611	Disposed	2016-07-21	Common Stock (1611)	Direct
2011-02-16	Employee Stock Option (Right to Buy)	$45.27	M	79667	Disposed	2014-07-27	Common Stock (79667)	Direct
2011-02-17	Employee Stock Option (Right to Buy)	$45.27	M	20333	Disposed	2014-07-27	Common Stock (20333)	Direct

Footnotes

F1: The sale price reflects the weighted average sales price of the shares sold; the individual transaction prices ranged from $111.81 to $112.66. Specific transaction details will be provided to the SEC upon request.

F2: The sale price reflects the weighted average sales price of the shares sold; the individual transaction prices ranged from $111.20 to $111.80. Specific transaction details will be provided to the SEC upon request.