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

Mar 15, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AFFILIATED MANAGERS GROUP INC (AMG)
CIK: 0001004434
Period of Report: 2010-03-15

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-03-15	Common Stock	M	20000	$48.38	Acquired	3437	Direct
2010-03-15	Common Stock	S	20000	$76.76	Disposed	3437	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-03-15	Employee Stock Option(Right to Buy)	$48.38	M	20000	Disposed	2015-11-03	Common Stock (20000)	Direct

Footnotes

F1: The reported amount is the weighted average sales price; the individual transaction prices ranged from $76.70 to $76.78. Specific transaction details will be provided to the SEC upon request.

F2: This option is exercisable in 25% increments on each of December 31, 2009, 2010, 2011 and 2012. The exercisability of this option would be accelerated upon change of control of the Company.