3M CO — Director's Dealing 2010

May 11, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: 3M CO (MMM)
CIK: 0000066740
Period of Report: 2010-05-10

Reporting Person: Lobey Jean (EXEC VP SFTY SEC & PROT SVCS)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-05-10	Common Stock	M	16590	$64.50	Acquired	17735	Direct
2010-05-10	Common Stock	S	640	$85.54	Disposed	17095	Direct
2010-05-10	Common Stock	S	920	$85.55	Disposed	16175	Direct
2010-05-10	Common Stock	S	920	$85.56	Disposed	15255	Direct
2010-05-10	Common Stock	S	1520	$85.57	Disposed	13735	Direct
2010-05-10	Common Stock	S	100	$85.575	Disposed	13635	Direct
2010-05-10	Common Stock	S	1400	$85.58	Disposed	12235	Direct
2010-05-10	Common Stock	S	100	$85.5802	Disposed	12135	Direct
2010-05-10	Common Stock	S	200	$85.5875	Disposed	11935	Direct
2010-05-10	Common Stock	S	5400	$85.59	Disposed	6535	Direct
2010-05-10	Common Stock	S	3389	$85.60	Disposed	3146	Direct
2010-05-10	Common Stock	S	100	$85.62	Disposed	3046	Direct
2010-05-10	Common Stock	S	600	$85.64	Disposed	2446	Direct
2010-05-10	Common Stock	S	1100	$85.645	Disposed	1346	Direct
2010-05-10	Common Stock	S	200	$85.65	Disposed	1146	Direct
2010-05-10	Common Stock	S	1	$85.66	Disposed	1145	Direct
2010-05-10	Common Stock	M	17380	$61.85	Acquired	18525	Direct
2010-05-10	Common Stock	S	139	$85.27	Disposed	18386	Direct
2010-05-10	Common Stock	S	200	$85.28	Disposed	18186	Direct
2010-05-10	Common Stock	S	800	$85.29	Disposed	17386	Direct
2010-05-10	Common Stock	S	1261	$85.30	Disposed	16125	Direct
2010-05-10	Common Stock	S	5	$85.302	Disposed	16120	Direct
2010-05-10	Common Stock	S	100	$85.305	Disposed	16020	Direct
2010-05-10	Common Stock	S	2300	$85.31	Disposed	13720	Direct
2010-05-10	Common Stock	S	1200	$85.315	Disposed	12520	Direct
2010-05-10	Common Stock	S	1300	$85.32	Disposed	11220	Direct
2010-05-10	Common Stock	S	100	$85.41	Disposed	11120	Direct
2010-05-10	Common Stock	S	200	$85.415	Disposed	10920	Direct
2010-05-10	Common Stock	S	134	$85.42	Disposed	10786	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-05-10	Non-qualified Stock Option (Right to Buy)	$64.50	M	16590	Disposed	2012-05-14	Common Stock (16590)	Direct
2010-05-10	Non-qualified Stock Option (Right to Buy)	$61.85	M	17380	Disposed	2013-05-12	Common Stock (17380)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	742	Indirect

Footnotes

F1: Includes shares acquired during the fiscal year pursuant to the 3M Voluntary Investment Plan.