X0306 4/A 2019-02-05 2019-02-07 0000066740 3M CO MMM 0001577544 Roman Michael F 3M CENTER ST. PAUL MN 55144-1000 1 1 Chief Exec Officer & Director Common Stock 2019-02-05 4 A 0 7624.196 0 A 33313.5722 D Common Stock 2019-02-05 4 F 0 241.797 0 D 33071.7752 D Incentive Stock Option (Right to Buy) 201.12 2019-02-05 4 A 0 146240 0 A 2020-02-05 2029-02-04 Common Stock 146240 146240 D On February 7, 2019, the reporting person reported the number of shares of 3M Common Stock that will be delivered on a deferred basis as a result of the vesting of a 2016 performance share award made to the reporting person. The number of shares previously reported as being withheld for the payment of FICA taxes was estimated. This amendment is being filed to update the Form 4 with the actual number of shares withheld. Includes shares acquired under 3M's General Employee Stock Purchase Plan. /s/ Sheila B. Claugherty, attorney-in-fact for Michael F. Roman 2019-02-20