安费诺美股招股说明书(2026-05-07版)

AMPHENOL CORPORATION€600,000,000 3.375% Senior Notes due 2029€500,000,000 3.875% Senior Notes due 2034 We are offering €600,000,000 aggregate principal amount of our 3.375% Senior Notes due 2029 (the “2029 notes”) and €500,000,000aggregate principal amount of our 3.875% Senior Notes due 2034 (the “2034 notes” and, together with the 2029 notes, the “notes”). We will pay interest on the 2029 notes annually on May 12 of each year, beginning on May12, 2027, and we will pay interest on the2034 notes annually on May 12 of each year, beginning on May12, 2027. Each series of the notes will be our unsecured senior obligations and will rank equally in right of payment with all of our other unsecuredsenior indebtedness outstanding from time to time. We may redeem some or all of the 2029 notes and the 2034 notes from time to time at the applicable redemption prices described in“Description of the Notes — Optional Redemption” in this prospectus supplement. Also, we may, at our option, redeem the 2029 notes and/orthe 2034 notes, in whole but not in part, at 100% of their principal amount, together with interest accrued thereon to, but not including, thedate fixed for redemption, in the event of certain changes in tax law as described under “Description of the Notes — Redemption UponChanges in Withholding Taxes.” Unless we have previously redeemed the notes, if a Change of Control Repurchase Event (as defined herein) occurs, we will be requiredto offer to repurchase the notes at a purchase price in cash equal to 101% of the principal amount of the notes, plus any accrued and unpaidinterest to, but not including, the date of repurchase as described under “Description of the Notes — Change of Control” in this prospectussupplement. 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 under theSecurities Exchange Act of 1934, as amended, each of which is incorporated by reference herein, for a discussion of certain risks you shouldconsider carefully before investing in the notes. Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities ordetermined if this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminaloffense. (1)Plus accrued interest, if any, from May 12, 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 the New YorkStock 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, as operator of theEuroclear System (“Euroclear”), and Clearstream Banking,société anonyme(“Clearstream”), on or about May12, 2026. Joint Book-Running Managers BarclaysBNP PARIBAS HSBC Mizuho Standard Chartered Bank Siebert Williams Shank The date of this prospectus supplement is May 5, 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 HOLDING GMBH8ENFORCEMENT OF CIVIL LIABILITIES9USE OF PROCEEDS11GUARANTOR DISCLOSURES12DESCRIPT