3M CO — Director's Dealing 2010

Aug 5, 2010

SEC Form 4/A — Form 4/A

Issuer: 3M CO (MMM)
CIK: 0000066740
Period of Report: 2010-07-27

Reporting Person: MacDonald Robert D III (VICE PRESIDENT MARKETING)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-07-27	Common Stock	F	1655	$86.80	Disposed	29627	Direct
2010-07-27	Common Stock	F	1633	$86.80	Disposed	32990	Direct
2010-07-27	Common Stock	F	443	$86.80	Disposed	33905	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-07-27	Non-qualified Stock Option (Right to Buy)	$86.80	A	3267	Acquired	2011-05-06	Common Stock (3267)	Direct
2010-07-27	Non-qualified Stock Option (Right to Buy)	$86.80	A	14017	Acquired	2013-05-13	Common Stock (14017)	Direct
2010-07-27	Non-qualified Stock Option (Right to Buy)	$86.80	A	13395	Acquired	2012-05-14	Common Stock (13395)	Direct

Footnotes

F1: On July 27, 2010, the reporting person completed three option exercises via swap, automatically received three reload grants, and reported these transactions on July 29, 2010. Due to a tax processing error, the reporting person's tax withholding for each exercise was incorrectly reported. The tax calculation error also impacted the number of shares awarded for each reload grant. This report corrects the tax withholding for each option exercise and corrects the subsequent number of shares awarded for each reload grant.