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 OF SECURITIES 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 * Holmes Christopher D   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) Senior VP, Supply Chain Ops (Last) (First) (Middle) 3M CENTER 3. Date of Earliest Transaction (Month/Day/Year) 07/30/2014 (Street) ST. PAUL, MN 55144-1000 4. If Amendment, Date Original Filed(Month/Day/Year) 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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 07/30/2014   M   5,120 (1) A $ 76.8 10,429.2036 D   Common Stock 07/30/2014   F   2,735 (1) D $ 143.74 7,694.2036 D   Common Stock 07/30/2014   F   1,149 (1) D $ 143.74 6,545.2036 D   Common Stock 07/30/2014   M   2,650 (2) A $ 87.35 9,195.2036 D   Common Stock 07/30/2014   F   1,610 (2) D $ 143.74 7,585.2036 D   Common Stock 07/30/2014   F   501 (2) D $ 143.74 7,084.2036 D

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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 (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

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 (Month/Day/Year)

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)

$ 76.8

07/30/2014

M

5,120 (1)

05/10/2006

05/08/2015

Common Stock

5,120

$ 0

0

D

Non-qualified Stock Option (Right to Buy)

$ 87.35

07/30/2014

M

2,650 (2)

05/09/2007

05/09/2016

Common Stock

2,650

$ 0

8,720

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Holmes Christopher D 3M CENTER ST. PAUL, MN 55144-1000			Senior VP, Supply Chain Ops

Signatures

Patricia L. Meagher, attorney-in-fact for Christopher D. Holmes		08/01/2014
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	This Form is being filed to report the exercise of a 3M stock option for a total of 5,120 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 1,236 shares of 3M common stock. As a result of this transaction, 1,149 shares were sold to pay withholding taxes to the respective government agencies.
(2)	This Form is being filed to report the exercise of a 3M stock option for a total of 2,650 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 539 shares of 3M common stock. As a result of this transaction, 501 shares were sold to pay withholding taxes to the respective government agencies.

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