AFFILIATED MANAGERS GROUP, INC. — Director's Dealing 2012

Aug 30, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AFFILIATED MANAGERS GROUP INC (AMG)
CIK: 0001004434
Period of Report: 2012-08-28

Reporting Person: Horgen Jay C. (CFO and Treasurer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-08-28	Common Stock	M	13675	$62.91	Acquired	11359	Direct
2012-08-28	Common Stock	S	8675	$118.86	Disposed	11359	Direct
2012-08-29	Common Stock	M	1325	$62.91	Acquired	11359	Direct
2012-08-29	Common Stock	M	30000	$65.51	Acquired	11359	Direct
2012-08-29	Common Stock	S	31325	$118.81	Disposed	11359	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-08-28	Employee Stock Option (Right to Buy)	$62.91	M	13675	Disposed	2017-07-20	Common Stock (13675)	Direct
2012-08-29	Employee Stock Option (Right to Buy)	$62.91	M	1325	Disposed	2017-07-20	Common Stock (1325)	Direct
2012-08-29	Employee Stock Option (Right to Buy)	$65.51	M	30000	Disposed	2016-12-02	Common Stock (30000)	Direct

Footnotes

F1: The sale reflects the weighted average sales price of the shares sold; the individual transaction prices ranged from $118.75 to $119.02. Specific transaction details will be provided to the SEC upon request.

F2: The sale reflects the weighted average sales price of the shares sold; the individual transaction prices ranged from $118.60 to $119.00. Specific transaction details will be provided to the SEC upon request.