Sec Form 4 Filing - SAUER BRAD T @ 3M CO - 2012-05-04

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person SAUER BRAD T 2. Issuer Name and Ticker or Trading Symbol 3M CO [ MMM] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) EXEC VP HEALTH CARE (Last) (First) (Middle) 3M CENTER 3. Date of Earliest Transaction (MM/DD/YY) 05/04/2012 (Street) ST. PAUL, MN55144-1000 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 05/04/2012 M 17,026 ( 1 ) A $ 84.4 33,232 D Common Stock 05/04/2012 F 16,206 ( 1 ) D $ 88.67 17,026 D Common Stock 05/04/2012 F 350 ( 1 ) D $ 88.67 16,676 D Common Stock 05/04/2012 M 14,215 A $ 76 30,891 D Common Stock 05/04/2012 S 100 D $ 88.5915 30,791 D Common Stock 05/04/2012 S 3,700 D $ 88.595 27,091 D Common Stock 05/04/2012 S 2,700 D $ 88.6 24,391 D Common Stock 05/04/2012 S 2,000 D $ 88.605 22,391 D Common Stock 05/04/2012 S 1,300 D $ 88.61 21,091 D Common Stock 05/04/2012 S 1,178 D $ 88.63 19,913 D Common Stock 05/04/2012 S 100 D $ 88.6315 19,813 D Common Stock 05/04/2012 S 2,400 D $ 88.635 17,413 D Common Stock 05/04/2012 S 637 D $ 88.64 16,776 D Common Stock 05/04/2012 S 100 D $ 88.645 16,676 D Common Stock 05/07/2012 S 1,118 D $ 88.0519 15,558 D Common Stock 05/07/2012 S 800 D $ 88.0615 14,758 D Common Stock 05/07/2012 S 300 D $ 88.0616 14,458 D Common Stock 05/07/2012 S 100 D $ 88.0617 14,358 D Common Stock 05/07/2012 S 800 D $ 88.065 13,558 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Non-qualified Stock Option (Right to Buy) $ 84.4 05/04/2012 M 17,026 ( 1 ) 05/12/2005 05/09/2014 Common Stock 17,026 $ 0 974 D Non-qualified Stock Option (Right to Buy) $ 76 05/04/2012 M 14,215 04/27/2010 05/13/2013 Common Stock 14,215 $ 0 0 D Non-qualified Stock Option (Right to Buy) $ 88.67 05/04/2012 A 16,556 11/04/2012 05/09/2014 Common Stock 16,556 $ 88.67 16,556 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other SAUER BRAD T 3M CENTER ST. PAUL, MN55144-1000 EXEC VP HEALTH CARE Signatures George Ann Biros, attorney-in-fact for Brad T. Sauer 05/08/2012 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This Form is being filed to report the exercise of a 3M stock option for a total of 17,026 shares by means of a stock swap. A stock swap is a method of exercising a stock option in which the option holder attests to the ownership of enough shares of stock already owned by the option holder to cover the exercise price of the option being exercised. As a result of this stock swap, the reporting person acquired ownership of an additional 470 shares of 3M common stock. As a result of this transaction, 350 shares were sold to pay withholding taxes to the respective government agencies.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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