3M (MMM) DEFA14A Additional proxy soliciting materials

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of
the Securities Exchange Act of 1934 (Amendment No.     )

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Filed by a Party other than the Registrant  o
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o	Preliminary Proxy Statement
o	Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
o	Definitive Proxy Statement
x	Definitive Additional Materials
o	Soliciting Material under §240.14a-12
3M Company
(Name of Registrant as Specified In Its Charter)
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)
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Ways to Vote Go to ProxyVote.com As an investor in this security, you have the right to vote on important issues. Make your voice heard now! Vote Common Shares by: May 10, 2021 Vote Plan Shares by: May 9, 2021 Call 1-800-690-6903 Control Number: 0123456789012345 This email represents the following share(s): 3M COMPANY-COMMON 123,456,789,012.00000

3M COMPANY - 401K 3M COMPANY - ESOP 3M COMPANY - COMMON 3M COMPANY 3M COMPANY-401K 3M COMPANY-ESOP 3M COMPANY-COMMON 123,456,789,012.00000 123,456,789,012.00000 123,456,789,012.00000 123,456,789,012.00000 123,456,789,012.00000 123,456,789,012.00000 123,456,789,012.00000 As a 3Mer and shareholder, you contribute to 3M's business growth and financial strength, you share in the risk and rewards, and you benefit from our Company's success. We encourage you to both understand and vote on the proposals being considered at this year's Annual Meeting. In this email you'll find the materials you need: Notice of the Annual Meeting and Proxy Statement, the 2020 Annual Report and helpful instructions. Your vote is very important; please enter it as soon as possible. As part of our precautions related to COVID-19, and to prioritize the health and well-being of our shareholders, this year’s Annual Shareholder Meeting will be held at 8:30 a.m. CDT, on Tuesday, May 11, 2021, exclusively online at www.virtualshareholdermeeting.com/MMM2021. There will not be a physical location for the Annual Meeting, and you will not be able to attend the meeting in person. To be admitted to the virtual-only Annual Meeting, you need to enter the 16-digit control number contained in this email. At the virtual Annual Meeting, you or your proxyholder may participate, vote, type in your question, and examine a list of shareholders of record. If you wish to submit questions in advance of the online meeting, you may do so by using your 16-digit control number to access www.proxyvote.com. Thank you all for your contributions! 3M Company Important Materials: Proxy Statement Annual Report

For holders as of March 16, 2021 (c) 1997-2021 Broadridge Financial Solutions Inc. P.O. Box 1310, Brentwood, NY 11717 ProxyVote and Broadridge are trademarks of Broadridge Financial Solutions Inc. CUSIP is a registered trademark of the American Bankers Association. All other registered marks belong to their respective owners. Email Settings | Terms and Conditions | Privacy Statement Why Should I Vote? Make your voice heard on critical issues like board elections and executive compensation. The outcome of the vote can affect the value of your shares. Attend the Virtual Meeting Attend the Meeting