3M CO — Director's Dealing 2010

Oct 1, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: 3M CO (MMM)
CIK: 0000066740
Period of Report: 2010-09-30

Reporting Person: SMITH MARSCHALL (VICE PRESIDENT LEGAL)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-09-30	Common Stock	M	7225	$54.11	Acquired	8857	Direct
2010-09-30	Common Stock	S	100	$87.64	Disposed	8757	Direct
2010-09-30	Common Stock	S	100	$87.68	Disposed	8657	Direct
2010-09-30	Common Stock	S	155	$87.69	Disposed	8502	Direct
2010-09-30	Common Stock	S	100	$87.70	Disposed	8402	Direct
2010-09-30	Common Stock	S	200	$87.72	Disposed	8202	Direct
2010-09-30	Common Stock	S	100	$87.7201	Disposed	8102	Direct
2010-09-30	Common Stock	S	100	$87.73	Disposed	8002	Direct
2010-09-30	Common Stock	S	145	$87.74	Disposed	7857	Direct
2010-09-30	Common Stock	S	100	$87.7754	Disposed	7757	Direct
2010-09-30	Common Stock	S	200	$87.78	Disposed	7557	Direct
2010-09-30	Common Stock	S	200	$87.8054	Disposed	7357	Direct
2010-09-30	Common Stock	S	340	$87.82	Disposed	7017	Direct
2010-09-30	Common Stock	S	200	$87.83	Disposed	6817	Direct
2010-09-30	Common Stock	S	100	$87.8336	Disposed	6717	Direct
2010-09-30	Common Stock	S	100	$87.839	Disposed	6617	Direct
2010-09-30	Common Stock	S	100	$87.84	Disposed	6517	Direct
2010-09-30	Common Stock	S	260	$87.85	Disposed	6257	Direct
2010-09-30	Common Stock	S	600	$87.86	Disposed	5657	Direct
2010-09-30	Common Stock	S	300	$87.87	Disposed	5357	Direct
2010-09-30	Common Stock	S	325	$87.88	Disposed	5032	Direct
2010-09-30	Common Stock	S	400	$87.89	Disposed	4632	Direct
2010-09-30	Common Stock	S	100	$87.8903	Disposed	4532	Direct
2010-09-30	Common Stock	S	100	$87.8913	Disposed	4432	Direct
2010-09-30	Common Stock	S	200	$87.90	Disposed	4232	Direct
2010-09-30	Common Stock	S	100	$87.9039	Disposed	4132	Direct
2010-09-30	Common Stock	S	500	$87.91	Disposed	3632	Direct
2010-09-30	Common Stock	S	100	$87.9127	Disposed	3532	Direct
2010-09-30	Common Stock	S	372	$87.92	Disposed	3160	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-09-30	Non-qualified Stock Option (Right to Buy)	$54.11	M	7225	Disposed	2019-02-08	Common Stock (7225)	Direct

Footnotes

F1: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 11, 2010.