3M CO — Director's Dealing 2010

May 6, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: 3M CO (MMM)
CIK: 0000066740
Period of Report: 2010-05-04

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-05-05	Common Stock	M	21299	$61.85	Acquired	36323	Direct
2010-05-05	Common Stock	F	15024	$87.68	Disposed	21299	Direct
2010-05-05	Common Stock	F	2051	$87.68	Disposed	19248	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-05-04	Non-qualified Stock Option (Right to Buy)	$87.68	A	17075	Acquired	2013-05-13	Common Stock (17075)	Direct
2010-05-05	Non-qualified Stock Option (Right to Buy)	$61.85	M	21299	Disposed	2013-05-12	Common Stock (21299)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	1405	Indirect

Footnotes

F1: Includes shares acquired during the fiscal year pursuant to the 3M Voluntary Investment Plan.