安费诺美股招股说明书(2026-05-05版)

AMPHENOL CORPORATION % Senior Notes due 20% Senior Notes due 20 We are offering €aggregate principal amount of our% Senior Notes due 20(the “20notes”) and €aggregate principal amount of our% Senior Notes due 20(the “20notes” and, together with the 20notes, the “notes”).We will pay interest on the 20notes annually onof each year, beginning on, 2027, and we will payinterest on the 20notes annually onof each year, beginning on, 2027. Each series of the notes will be our unsecured senior obligations and will rank equally in right of payment with all of our otherunsecured senior indebtedness outstanding from time to time. We may redeem some or all of the 20notes and the 20notes from time to time at the applicable redemption pricesdescribed in “Description of the Notes — Optional Redemption” in this prospectus supplement. Also, we may, at our option, redeemthe 20notes and/or the 20notes, in whole but not in part, at 100% of their principal amount, together with interest accruedthereon to, but not including, the date fixed for redemption, in the event of certain changes in tax law as described under“Description of the Notes — Redemption Upon Changes in Withholding Taxes.” Unless we have previously redeemed the notes, if a Change of Control Repurchase Event (as defined herein) occurs, we will berequired to offer to repurchase the notes at a purchase price in cash equal to 101% of the principal amount of the notes, plus anyaccrued and unpaid interest to, but not including, the date of repurchase as described under “Description of the Notes — Change ofControl” in this prospectus supplement. Investing in the notes involves risks. See “Risk Factors” beginning on pageS-9of this prospectus supplement and on page6of theaccompanying prospectus and the risk factors included in our periodic reports filed with the Securities and Exchange Commission underthe Securities Exchange Act of 1934, as amended, each of which is incorporated by reference herein, for a discussion of certain risks youshould consider carefully before investing in the notes. Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of thesesecurities or determined if this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to thecontrary is a criminal offense. (1)Plus accrued interest, if any, from, 2026, if settlement occurs after that date. Each series of notes is a new issue of securities with no established trading market. We intend to apply to list the notes on theNew York Stock Exchange (the “NYSE”). The listing application will be subject to approval by the NYSE. The notes will be ready for delivery in book-entry form only through a common depositary for Euroclear Bank SA/NV, asoperator of the Euroclear System (“Euroclear”), and Clearstream Banking,société anonyme(“Clearstream”), on or about,2026. BarclaysBNP PARIBAS HSBC Mizuho Co-Managers INGThe 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 senior notes and are not soliciting an offer to buy these senior notes in any jurisdiction where the offer or sale is not permitted. Siebert Williams Shank , 2026. Each of this prospectus supplement, the accompanying prospectus and any free writing prospectus weauthorize contains and incorporates by reference information that you should consider when making yourinvestment decision. We have not, and the underwriters have not, authorized anyone to provide you withdifferent information. If you receive any different or inconsistent information, you should not rely on it. You should assume that the information contained in this prospectus supplement, the accompanyingprospectus, any free writing prospectus and the documents incorporated by reference herein and therein, isaccurate only as of their respective dates. Our business, financial condition, results of operations and prospectsmay have changed since those dates. We are not, and the underwriters are not, making an offer to sell the notes in any jurisdiction where theoffer or sale is not permitted. TABLE OF CONTENTS Prospectus Supplement PageABOUT THIS PROSPECTUS SUPPLEMENTS-iiFORWARD-LOOKING STATEMENTSS-vTRADEMARKSS-viINCORPORATION OF CERTAIN INFORMATION BY REFERENCES-viSUMMARYS-1RISK FACTORSS-9USE OF PROCEEDSS-14CAPITALIZATIONS-15DESCRIPTION OF THE NOTESS-17PROVISIONS RELATING TO THE NOTES WHILE REPRESENTED BY THE GLOBAL NOTESS-28MATERIAL UNITED STATES FEDERAL INCOME TAX CONSEQUENCESS-32CERTAIN ERISA CONSIDERATIONSS-39UNDERWRITING (CONFLICTS OF INTEREST)S-41LEGAL MATTERSS-47EXPERTSS-47 Prospectus PageABOUT THIS PROSPECTUS1NOTICE TO PROSPECTIVE INVESTORS IN THE EUROPEAN ECONOMIC AREA3FORWARD-LOOKING STATEMENTS4WHERE YOU CAN FIND MORE INFORMATION4INCORPORATION OF CERTAIN INFORMATION BY REFERENCE5RISK FACTORS6AMPHENOL CORPORATION7AMPHENOL TECHNOLOGIES