3M CO — Director's Dealing 2010

May 3, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: 3M CO (MMM)
CIK: 0000066740
Period of Report: 2010-04-30

Reporting Person: CAMPBELL PATRICK D (VICE PRESIDENT FINANCE & CFO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-04-30	Common Stock	M	880	$58.625	Acquired	4409	Indirect
2010-04-30	Common Stock	S	880	$89.3545	Disposed	3529	Indirect
2010-04-30	Common Stock	M	740	$64.50	Acquired	4269	Indirect
2010-04-30	Common Stock	S	740	$89.27	Disposed	3529	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-04-30	Incentive Stock Option (Right to Buy)	$58.625	M	880	Disposed	2011-05-08	Common Stock (880)	Indirect
2010-04-30	Non-qualified Stock Option (Right to Buy)	$64.50	M	740	Disposed	2012-05-14	Common Stock (740)	Indirect