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

May 15, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AFFILIATED MANAGERS GROUP INC (AMG)
CIK: 0001004434
Period of Report: 2012-05-11

Reporting Person: KINGSTON JOHN III (Vice Chairman & Gen. Counsel)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-02-13	Common Stock	G	378	—	Disposed	24000	Direct
2012-05-11	Common Stock	M	3222	$62.04	Acquired	24000	Direct
2012-05-11	Common Stock	M	45000	$45.27	Acquired	24000	Direct
2012-05-11	Common Stock	S	45000	$106.91	Disposed	24000	Direct
2012-05-14	Common Stock	M	1278	$45.27	Acquired	24000	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-05-11	Employee Stock Option (Right to Buy)	$62.04	M	3222	Disposed	2016-07-21	Common Stock (3222)	Direct
2012-05-11	Employee Stock Option (Right to Buy)	$45.27	M	45000	Disposed	2014-07-27	Common Stock (45000)	Direct
2012-05-14	Employee Stock Option (Right to Buy)	$45.27	M	1278	Disposed	2014-07-27	Common Stock (1278)	Direct

Footnotes

F1: The sale reflects the weighted average sales price of the shares sold; the individual transaction prices ranged from $106.70 to $107.15. Specific transaction details will be provided to the SEC upon request.