3M CO — Director's Dealing 2015

May 18, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: 3M CO (MMM)
CIK: 0000066740
Period of Report: 2015-05-15

Reporting Person: Roman Michael F (Executive Vice President)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-05-15	Common Stock	M	2500	$87.35	Acquired	7474	Direct
2015-05-15	Common Stock	S	1900	$162.77	Disposed	5574	Direct
2015-05-15	Common Stock	M	5000	$87.35	Acquired	10574	Direct
2015-05-15	Common Stock	S	144	$162.70	Disposed	10430	Direct
2015-05-15	Common Stock	S	300	$162.71	Disposed	10130	Direct
2015-05-15	Common Stock	S	4456	$162.72	Disposed	5674	Direct
2015-05-15	Common Stock	S	100	$162.722	Disposed	5574	Direct
2015-05-15	Common Stock	G	532	—	Disposed	5042	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-05-15	Non-qualified Stock Option (Right to Buy)	$87.35	M	5000	Disposed	2016-05-09	Common Stock (5000)	Direct
2015-05-15	Non-qualified Stock Option (Right to Buy)	$87.35	M	2500	Disposed	2016-05-09	Common Stock (2500)	Direct

Footnotes

F1: This form is being filed to report the exercise of a 3M stock option by means of a cashless-sell-to-cover method (selling enough shares to cover option share purchase price, fee and taxes, then retaining the remaining shares).