3M CO — Director's Dealing 2006

May 8, 2006

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: 3M CO (MMM)
CIK: 0000066740
Period of Report: 2006-05-04

Reporting Person: MAHAN JAMES T (VICE PRESIDENT ENGRG MFG & LOG)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2006-05-04	Common Stock	M	1270	$62.65	Acquired	21267	Direct
2006-05-04	Common Stock	F	922	$86.255	Disposed	20345	Direct
2006-05-04	Common Stock	F	113	$86.255	Disposed	20232	Direct
2006-05-04	Common Stock	M	252	$64.5	Acquired	20484	Direct
2006-05-04	Common Stock	F	188	$86.255	Disposed	20296	Direct
2006-05-04	Common Stock	F	20	$86.255	Disposed	20276	Direct
2006-05-04	Common Stock	M	2172	$31.5175	Acquired	22448	Direct
2006-05-04	Common Stock	F	793	$86.255	Disposed	21655	Direct
2006-05-04	Common Stock	S	5000	$86.4764	Disposed	16655	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2006-05-04	Incentive Stock Option (right to buy)	$31.5175	M	2172	Disposed	2006-05-14	Common Stock (2172)	Direct
2006-05-04	Non-Qualified Stock Option (right to buy)	$62.65	M	1270	Disposed	2006-05-12	Common Stock (1270)	Direct
2006-05-04	Non-Qualified Stock Option (right to buy)	$64.5	M	252	Disposed	2006-05-12	Common Stock (252)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	3739	Indirect