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	S	328	$87.93	Disposed	2832	Direct
2010-09-30	Common Stock	S	100	$87.9318	Disposed	2732	Direct
2010-09-30	Common Stock	S	100	$87.9354	Disposed	2632	Direct
2010-09-30	Common Stock	S	300	$87.94	Disposed	2332	Direct
2010-09-30	Common Stock	S	100	$87.9418	Disposed	2232	Direct
2010-09-30	Common Stock	S	100	$87.945	Disposed	2132	Direct
2010-09-30	Common Stock	S	100	$87.95	Disposed	2032	Direct
2010-09-30	Common Stock	S	100	$87.96	Disposed	1932	Direct
2010-09-30	Common Stock	S	100	$87.98	Disposed	1832	Direct
2010-09-30	Common Stock	S	200	$88.00	Disposed	1632	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	358	Indirect

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.

F2: Includes shares acquired during the fiscal year pursuant to the 3M Voluntary Investment Plan.