FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 [ ] 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 OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response... 0.5 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 McGrath Marlene Mary 3M CO [ MMM ] (Last) (First) 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director 3. Date of Earliest Transaction (MM/DD/YYYY) (Middle) (Street) 4. If Amendment, Date Original Filed (MM/DD/YYYY) 6. Individual or Joint/Group Filing (Check Applicable Line) ST. PAUL, MN 55144-1000 (City) _____ Other (specify below) Senior VP - Human Resources 6/3/2016 3M CENTER _____ 10% Owner __ X __ Officer (give title below) (State) _ 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. Date 2A. Deemed Execution Date, if any 3. Trans. Code (Instr. 8) Code V 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) Amount (A) or (D) Price 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) Common Stock 6/3/2016 M 3522 A $168.38 18895 D Common Stock 6/3/2016 F 1698 D $168.38 17197 D 7. Nature of Indirect Beneficial Ownership (Instr. 4) Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivate Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed 4. Trans. Code 5. Number of 6. Date Exercisable and Execution (Instr. 8) Derivative Expiration Date Date, if any Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) Code Restricted Stock Units (1) 6/3/2016 V (A) M (D) 3522 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) Date Expiration Title Exercisable Date (2) (2) 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 3523 D Amount or Number of Shares 3522 11. Nature of Indirect Beneficial Ownership (Instr. 4) Explanation of Responses: ( 1) Each restricted stock unit represents a contingent right to receive one share of 3M common stock. ( 2) The restricted stock units will vest in equal installments on 6/3/2016 and 6/3/2018. Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer McGrath Marlene Mary 3M CENTER ST. PAUL, MN 55144-1000 Other Senior VP - Human Resources Signatures /s/ Sheila B. Claugherty, attorney-in-fact for Marlene M. McGrath 6/6/2016 ** Signature of Reporting Person 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.