美国运通美股招股说明书(2026-06-10版)

€American Express Company% Fixed-to-Floating Rate Notes due, 20 We are offering €principal amount of our% fixed-to-floating rate notes due, 20, or the notes. We will pay interest on the notes (i)from, and including,, 2026, to, but excluding,, 20at a rate perannum equal to%, payable annually in arrears onof each year, beginning, 2027 and endingon, 20, and (ii)from, and including,, 20to, but excluding, the maturity date at a rate perannum equal to three-month EURIBOR (as defined on pageS-16of this prospectus supplement) plus%, payablequarterly in arrears on,,and, beginning, 20and ending on the maturity date.The notes will mature on, 20. We may redeem the notes (i)in whole or in part on or after, 20and prior to, 20,(ii)in whole but not in part on, 20, (iii)in whole or in part during theperiod prior to thematurity date or (iv) in whole but not in part upon the occurrence of a Tax Event (as defined on pageS-20of thisprospectus supplement), in each case at the applicable redemption price described under “Description of Notes” below.The notes will be our senior unsecured obligations and will rank prior to all of our present and future subordinatedindebtedness and on an equal basis with all of our other present and future senior unsecured indebtedness. Currently there is no public market for the notes. We intend to apply to list the notes on the New York StockExchange (“NYSE”). The listing application will be subject to approval by the NYSE. We expect trading in the notes onthe NYSE to begin within 30days after the original issue date. If such a listing is obtained, we have no obligation tomaintain such listing and we may delist the notes at any time. We will only issue the notes in book-entry form through a common depositary of Clearstream Banking S.A.(“Clearstream”) and Euroclear Bank SA/NV, as operator of the Euroclear system (“Euroclear” and, together withClearstream, the “clearing systems”). Except as described in this prospectus supplement, we will not issue notes indefinitive form. The underwriters are offering the notes for sale in those jurisdictions both inside and outside the United Stateswhere it is lawful to make such offers. Investing in the notes involves risks. You should carefully consider the information under “Risk Factors” beginning onpageS-8of this prospectus supplement and on page3of the accompanying prospectus, and in ourAnnual Report onForm10-K for the year ended December31, 2025and ourQuarterly Report on Form 10-Q for the quarter ended March31,2026, each incorporated herein by reference. The notes are not deposits or savings accounts. The notes are not insured or guaranteed by the Federal DepositInsurance Corporation (“FDIC”) or by any other governmental agency or instrumentality. Price to PublicUnderwritingDiscountProceeds to theCompanyPer noteTotal for notes€€€(1)(1)(2)%%% (1)(2)Plus accrued interest, if any, from, 2026 to the date of delivery.Before offering expenses. Delivery of the notes will be made on or about, 2026. Neither the Securities and Exchange Commission (the “SEC”) nor any state securities commission has approved ordisapproved of these securities or determined if this prospectus supplement or the accompanying prospectus is truthful orcomplete. Any representation to the contrary is a criminal offense. Joint Book-Running ManagersThe information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offerto sell these securities and are not soliciting an offer to buy these securities in any state where the offer or sale is not permitted. , 2026. TABLE OF CONTENTS Prospectus Supplement PageStabilizationS-1Notice to Prospective Investors in the European Economic AreaS-1Notice to Prospective Investors in the United KingdomS-2About This Prospectus SupplementS-3SummaryS-4Risk FactorsS-8Cautionary Statement Regarding Forward-Looking InformationS-13Use of ProceedsS-14Description of NotesS-15Material U.S. Federal Income Tax ConsequencesS-27UnderwritingS-30Where You Can Find More InformationS-33Incorporation of Certain Documents by ReferenceS-33Legal MattersS-34ExpertsS-34ProspectusAbout This ProspectusiiWhere You Can Find More InformationiiIncorporation of Certain Documents by ReferenceiiForward-Looking StatementsivThe Company1Summary of the Securities We May Offer1Risk Factors3Use of Proceeds12Description of Debt Securities13Description of Preferred Shares40Description of Depositary Shares42Description of Common Shares43Description of Securities Warrants45Description of Other Warrants47Description of Units48Description of Guarantees49ERISA Considerations50Material U.S. Federal Income Tax Consequences of Debt Securities52Plan of Distribution57Legal Matters64Experts64 STABILIZATION IN CONNECTION WITH THE OFFERING OF THE NOTES, MORGAN STANLEY & CO.INTERNATIONAL PLC (THE “STABILIZING MANAGER”) (OR PERSONS ACTING ON ITS BEHALF)MAY OVER-ALLOT NOTES OR EFFECT TRANSACTIO