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
                                                                                  
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OMB Number: 3235-0287
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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 *

McGrath Marlene Mary
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 - Human Resources
(Last)          (First)          (Middle)

3M CENTER
3. Date of Earliest Transaction (MM/DD/YYYY)

5/18/2017
(Street)

ST. PAUL, MN 55144-1000
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

5/19/2017 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

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)
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   5/18/2017     M    3573   A $89.47   24480   D    
Common Stock   5/18/2017     S    56   D $194.9301   24424   D    
Common Stock   5/18/2017     S    1300   D $194.931   23124   D    
Common Stock   5/18/2017     S    100   D $194.94   23024   D    
Common Stock   5/18/2017     S    700   D $194.942   22324   D    
Common Stock   5/18/2017     S    1417   D $194.9556   20905   D    
Common Stock   5/18/2017     M    5360   A $87.89   26267   D    
Common Stock   5/18/2017     S    589   D $194.79   25678   D    
Common Stock   5/18/2017     S    200   D $194.80   25478   D    
Common Stock   5/18/2017     S    971   D $194.8155   24507   D    
Common Stock   5/18/2017     S    300   D $194.82   24207   D    
Common Stock   5/18/2017     S    200   D $194.83   24007   D    
Common Stock   5/18/2017     S    1100   D $194.84   22907   D    
Common Stock   5/18/2017     S    600   D $194.8401   22307   D    
Common Stock   5/18/2017     S    200   D $194.841   22107   D    
Common Stock   5/18/2017     S    300   D $194.845   21807   D    
Common Stock   5/18/2017     S    400   D $194.853   21407   D    
Common Stock   5/18/2017     S    500   D $194.865   20907   (1) D    

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 Execution Date, if any 4. Trans. 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 7. Title and Amount of Securities Underlying Derivative Security
(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)   (2) $89.47   5/18/2017     M         3573    2/8/2012   2/8/2021   Common Stock   3573   $0   0   D    
Non-qualified Stock Option (Right to Buy)   (3) $87.89   5/18/2017     M         5360    2/7/2013   2/7/2022   Common Stock   5360   $0   0   D    

Explanation of Responses:
(1)  Due to an error caused by a third-party vendor, the reporting person in refiling a report filed earlier today, solely to correct the total holding reported in column 5 of Table 1.
(2)  This option becomes exercisable in equal installments on each of the first three anniversaries of the grant date (2/8/2011).
(3)  This option becomes exercisable in equal installments on each of the first three anniversaries of the grant date (2/5/2013).

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
McGrath Marlene Mary
3M CENTER
ST. PAUL, MN 55144-1000


Senior VP - Human Resources

Signatures
/s/ Sheila B. Claugherty, attorney-in-fact for Marlene M. McGrath 5/19/2017
** 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.
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