3M CO — Director's Dealing 2012

May 1, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: 3M CO (MMM)
CIK: 0000066740
Period of Report: 2012-04-27

Reporting Person: Bushman Julie L (Executive Vice President)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-04-27	Common Stock	M	7540	$61.85	Acquired	21451	Direct
2012-04-27	Common Stock	F	5218	$89.36	Disposed	16233	Direct
2012-04-27	Common Stock	F	759	$89.36	Disposed	15474	Direct
2012-04-27	Common Stock	M	19752	$54.11	Acquired	35226	Direct
2012-04-27	Common Stock	S	10074	$89.26	Disposed	25152	Direct
2012-04-27	Common Stock	S	2516	$89.27	Disposed	22636	Direct
2012-04-27	Common Stock	S	400	$89.28	Disposed	22236	Direct
2012-04-27	Common Stock	S	400	$89.29	Disposed	21836	Direct
2012-04-27	Common Stock	S	6262	$89.30	Disposed	15574	Direct
2012-04-27	Common Stock	S	100	$89.3025	Disposed	15474	Direct
2012-04-30	Common Stock	S	1563	$89.18	Disposed	13911	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-04-27	Non-qualified Stock Option (Right to Buy)	$61.85	M	7540	Disposed	2013-05-13	Common Stock (7540)	Direct
2012-04-27	Non-qualified Stock Option (Right to Buy)	$54.11	M	19752	Disposed	2019-02-08	Common Stock (19752)	Direct
2012-04-27	Non-qualified Stock Option (Right to Buy)	$89.36	A	5977	Acquired	2013-05-13	Common Stock (5977)	Direct

Footnotes

F1: This option became exercisable in equal installments on each of the first three anniversaries of the grant date (2/9/2009)

F2: This Form is being filed to report the exercise of a 3M stock option for a total of 7,540 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 1,563 shares of 3M common stock. As a result of this transaction, 759 shares were sold to pay withholding taxes to the respective government agencies.