3M CO — Director's Dealing 2012

May 8, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: 3M CO (MMM)
CIK: 0000066740
Period of Report: 2012-05-04

Reporting Person: SAUER BRAD T (EXEC VP HEALTH CARE)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-05-04	Common Stock	M	17026	$84.40	Acquired	33232	Direct
2012-05-04	Common Stock	F	16206	$88.67	Disposed	17026	Direct
2012-05-04	Common Stock	F	350	$88.67	Disposed	16676	Direct
2012-05-04	Common Stock	M	14215	$76.00	Acquired	30891	Direct
2012-05-04	Common Stock	S	100	$88.5915	Disposed	30791	Direct
2012-05-04	Common Stock	S	3700	$88.595	Disposed	27091	Direct
2012-05-04	Common Stock	S	2700	$88.60	Disposed	24391	Direct
2012-05-04	Common Stock	S	2000	$88.605	Disposed	22391	Direct
2012-05-04	Common Stock	S	1300	$88.61	Disposed	21091	Direct
2012-05-04	Common Stock	S	1178	$88.63	Disposed	19913	Direct
2012-05-04	Common Stock	S	100	$88.6315	Disposed	19813	Direct
2012-05-04	Common Stock	S	2400	$88.635	Disposed	17413	Direct
2012-05-04	Common Stock	S	637	$88.64	Disposed	16776	Direct
2012-05-04	Common Stock	S	100	$88.645	Disposed	16676	Direct
2012-05-07	Common Stock	S	1118	$88.0519	Disposed	15558	Direct
2012-05-07	Common Stock	S	800	$88.0615	Disposed	14758	Direct
2012-05-07	Common Stock	S	300	$88.0616	Disposed	14458	Direct
2012-05-07	Common Stock	S	100	$88.0617	Disposed	14358	Direct
2012-05-07	Common Stock	S	800	$88.065	Disposed	13558	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-05-04	Non-qualified Stock Option (Right to Buy)	$84.40	M	17026	Disposed	2014-05-09	Common Stock (17026)	Direct
2012-05-04	Non-qualified Stock Option (Right to Buy)	$76.00	M	14215	Disposed	2013-05-13	Common Stock (14215)	Direct
2012-05-04	Non-qualified Stock Option (Right to Buy)	$88.67	A	16556	Acquired	2014-05-09	Common Stock (16556)	Direct

Footnotes

F1: This Form is being filed to report the exercise of a 3M stock option for a total of 17,026 shares by means of a stock swap. A stock swap is a method of exercising a stock option in which the option holder attests to the ownership of enough shares of stock already owned by the option holder to cover the exercise price of the option being exercised. As a result of this stock swap, the reporting person acquired ownership of an additional 470 shares of 3M common stock. As a result of this transaction, 350 shares were sold to pay withholding taxes to the respective government agencies.