OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response... 0.5 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940 1. Name and Address of Reporting Person * 2. Issuer Name and Ticker or Trading Symbol 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) Hardgrove Ian F 3M CO [ MMM ] (Last) (First) 3. Date of Earliest Transaction (MM/DD/YYYY) (Middle) (Street) (State) _____ Other (specify 4. If Amendment, Date Original Filed Sr. Vice President 6. Individual or Joint/Group Filing (Check (MM/DD/YYYY) Applicable Line) ST. PAUL, MN 55144-1000 (City) _____ 10% Owner __ X __ Officer (give title below) below) 9/1/2015 3M CENTER _____ Director _ X _ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Trans. 2A. 3. Trans. Date Deemed Code Execution (Instr. 8) Date, if any 4. Securities Acquired 5. Amount of Securities Beneficially Owned (A) or Disposed of (D) Following Reported Transaction(s) (Instr. 3 and 4) (Instr. 3, 4 and 5) (A) or Code V Amount (D) 9/1/2015 Common Stock M 9/1/2015 Common Stock F 2021 Price A $138.50 680 (1) D $138.50 Common Stock 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 15374 D 14694 (2) D 810 (3) I 7. Nature of Indirect Beneficial Ownership (Instr. 4) By 401k/paesop Trust Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivate Security (Instr. 3) 2. 3. Trans. Conversion Date or Exercise Price of Derivative Security 3A. 4. Trans. Deemed Code Execution (Instr. 8) Date, if any 5. Number of 6. Date Exercisable Derivative and Expiration Date Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) Code V (A) Restricted Stock Units $0 (4) 9/1/2015 M (D) 2021 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) Date Expiration Title Exercisable Date (5) (5) Common Stock 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) $0 0 D Amount or Number of Shares 2021 Explanation of Responses: ( 1) The number of shares withheld for taxes are estimated and will be revised by amendment, if necessary. ( 2) Includes shares acquired under 3M's General Employee Stock Purchase Plan. ( 3) Includes shares acquired pursuant to the 3M Voluntary Investment Plan. ( 4) Each restricted stock unit represents a contingent right to receive one share of 3M common stock. ( 5) The restricted stock units will vest in equal installments on 9-1-2013 and 9-1-2015. Reporting Owners Reporting Owner Name / Address Hardgrove Ian F 3M CENTER ST. PAUL, MN 55144-1000 Relationships Director 10% Owner Officer Sr. Vice President Other 11. Nature of Indirect Beneficial Ownership (Instr. 4) Signatures /s/ Sheila B. Claugherty, attorney-in-fact for Ian F. Hardgrove ** Signature of Reporting Person 9/3/2015 Date 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. Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.