tm2621008-1_424b5 - none

424B5 1 tm2621008-1_424b5.htm 424B5 tm2621008-1_424b5 - none - 5.281292s

This preliminary prospectus supplement and the accompanying prospectus relate to an effective registration statement under the Securities Act of 1933, as amended, but are not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and we are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitted.

Filed pursuant to 424(b)(5)
File No. 333-293169

SUBJECT TO COMPLETION, DATED SEPTEMBER 3, 2026

PRELIMINARY PROSPECTUS SUPPLEMENT
(To prospectus dated February 3, 2026)

€

3M Company

€ % Notes due 20
€ % Notes due 20
€ % Notes due 20

We are offering € aggregate principal amount of % Notes due 20 (the “20 notes”), € aggregate principal amount of % Notes due 20 (the “20 notes”) and € aggregate principal amount of % Notes due 20 (the “20 notes” and, together with the 20 notes and the 20 notes, the “notes”).

We will pay interest on the notes on of each year, beginning on , 2027. The 20 notes will mature on , 20 , the 20 notes will mature on , 20 and the 20 notes will mature on , 20 .

We may redeem some or all of the notes at any time, and from time to time, at the applicable redemption prices described in this prospectus supplement. See “Description of the Notes — Optional Redemption of the Notes.”

We may redeem any series of the notes in whole, but not in part, at any time at our option in the event of certain changes in the tax laws of a relevant Tax Jurisdiction (as defined herein) that would require us to pay additional amounts as described under “Description of the Notes — Redemption for Tax Reasons.”

The notes will be our unsecured and unsubordinated obligations and will rank equally with our existing and future unsecured and unsubordinated indebtedness.

Investing in the notes involves risks. See “Risk Factors” beginning on page S-11 of this prospectus supplement as well as the “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2025 and our Quarterly Reports on Form 10-Q for the periods ended March 31, 2026 and June 30, 2026, each of which is incorporated by reference into this prospectus supplement.

Per 20
Note

Total

Per 20
Note

Total

Per 20
Note

Total

Public offering price(1)

€

Underwriting discount

€

Proceeds, before expenses, to us(1)

€

(1)

Plus accrued interest, if any, from , 2026, if settlement occurs after that date.

Neither the Securities and Exchange Commission (“SEC”) nor any other regulatory body has approved or disapproved of these securities or passed upon the accuracy and adequacy of this prospectus supplement or the accompanying prospectus. Any representation to the contrary is a criminal offense.

We intend to apply to list each series of the notes on the New York Stock Exchange (“NYSE”). The listing applications will be subject to approval by NYSE. We currently expect trading in each series of the notes on NYSE to begin within 30 days after the original issue date. Currently, there is no public market for any series of the notes.

The underwriters expect to deliver the notes on or about , 2026, only in book-entry form through the facilities of Euroclear Bank SA/NV (“Euroclear”), and Clearstream Banking S.A. (“Clearstream”), which will be the fifth London business day following the date hereof (this settlement cycle being referred to as “T+5”). See “Underwriting (Conflicts of Interest).” Under Rule 15c6-1 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) trades in the secondary market generally are required to settle in one business day, unless the parties to a trade expressly agree otherwise. Accordingly, purchasers who wish to trade the notes on any day prior to the London business day before delivery will be required to specify alternative settlement arrangements at the time of any such trade to prevent a failed settlement and should consult their own advisors.

Joint Book-Running Managers

Deutsche Bank

BofA Securities

Citigroup

J.P. Morgan

The date of this prospectus supplement is , 2026.

	Page
ABOUT THIS PROSPECTUS SUPPLEMENT		S-1
CAUTIONARY NOTE CONCERNING FACTORS THAT MAY AFFECT FUTURE RESULTS		S-4
SUMMARY		S-6
RISK FACTORS		S-11
USE OF PROCEEDS		S-16
DESCRIPTION OF THE NOTES		S-17
CERTAIN U.S. FEDERAL TAX CONSIDERATIONS		S-28
UNDERWRITING (CONFLICTS OF INTEREST)		S-35
LEGAL MATTERS		S-40
EXPERTS		S-40
WHERE YOU CAN FIND MORE INFORMATION AND INCORPORATION BY REFERENCE		S-40

	Page
ABOUT THIS PROSPECTUS		1
WHERE YOU CAN FIND ADDITIONAL INFORMATION		1
INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE		1
THE COMPANY		3
RISK FACTORS		4
SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS		5
USE OF PROCEEDS		7
DESCRIPTION OF THE SECURITIES WE MAY OFFER		8
DEBT SECURITIES		8
CAPITAL STOCK		18
PLAN OF DISTRIBUTION		20
LEGAL MATTERS		21
EXPERTS		21

	Paid by Us
Per 20 note			%
20 notes total		€
Per 20 note			%
20 notes total		€
Per 20 note			%
20 notes total		€
Total		€