安费诺美股招股说明书(2026-03-25版)

AMPHENOL TECHNOLOGIES HOLDING GmbH€500,000,000 3.625% Senior Notes due 2031Guaranteed on a Senior Unsecured Basis byAMPHENOL CORPORATION Amphenol Technologies Holding GmbH (the “Issuer”) is offering €500,000,000 aggregate principal amount of 3.625% SeniorNotes due 2031 (the “notes”). The Issuer will pay interest on the notes annually on March30 of each year, beginning on March30, 2027. The notes will be the Issuer’s senior unsecured and unsubordinated indebtedness and will rank equally in right of payment withall of the Issuer’s existing and future senior unsecured and unsubordinated indebtedness, senior in right of payment to the Issuer’sfuture indebtedness that is expressly subordinated to the notes, structurally subordinated to the indebtedness of the Issuer’s subsidiariesand effectively subordinated to all of the Issuer’s future secured indebtedness to the extent of the value of the assets securing suchindebtedness. The notes will be guaranteed on a senior unsecured basis by Amphenol Corporation (the “Guarantee”), a Delawarecorporation and the Issuer’s indirect corporate parent (the “Guarantor”). The Guarantee will be a senior unsecured obligation of theGuarantor and will rank equally in right of payment with all of the Guarantor’s existing and future unsecured and unsubordinatedindebtedness, senior in right of payment to any future unsecured and subordinated indebtedness of the Guarantor, structurallysubordinated to the indebtedness of the Guarantor’s subsidiaries and effectively subordinated to the Guarantor’s future securedindebtedness to the extent of the value of the assets securing such indebtedness. The Issuer may redeem some or all of the notes from time to time at the applicable redemption prices described in “Descriptionof the Notes — Optional Redemption” in this prospectus supplement. Also, the Issuer may, at its option, redeem the notes, in whole butnot in part, at 100% of their principal amount, together with interest accrued thereon to, but not including, the date fixed forredemption, in the event of certain changes in tax law as described under “Description of the Notes — Tax Redemption.” Unless the Issuer has previously redeemed the notes, if a Change of Control Repurchase Event (as defined herein) occurs, theIssuer will be required to 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 unpaid interest to, but not including, the date of repurchase as described under “Description of the Notes —Change of Control” in this prospectus supplement. Investing in the notes involves risks. See “Risk Factors” beginning on pageS-10of this prospectus supplement and on page 6 of theaccompanying prospectus and the risk factors included in Amphenol Corporation’s periodic reports filed with the Securities and ExchangeCommission under the Securities Exchange Act of 1934, as amended, each of which is incorporated by reference herein, for a discussion ofcertain risks you should consider carefully before investing in the notes. Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securitiesor determined if this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is acriminal offense. There is currently no market for the notes. An application will be made for the listing particulars relating to the notes to beapproved by the Irish Stock Exchange plc, trading as Euronext Dublin (“Euronext Dublin”) and for the notes to be admitted to listingon the Official List of Euronext Dublin and trading on the Global Exchange Market thereof. There can be no assurance that the noteswill be admitted to the Official List of Euronext Dublin or admitted to trading on the Global Exchange Market. The listing applicationwill be subject to approval by Euronext Dublin. The Issuer cannot assure you that its application to list the notes on the Official List ofEuronext Dublin will be approved or that the notes will be admitted to trading on the Global Exchange Market thereof or that any suchadmissions to listing and trading will be maintained. Prospective purchasers of the notes should be aware that the Global ExchangeMarket is not a regulated market for the purposes of Directive 2014/65/EU (as amended, “MiFID II”). See “Description of the Notes— Listing of the notes” and “Underwriting.” (1)Plus accrued interest, if any, from March30, 2026, if settlement occurs after that date. 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 March30,2026. The date of this prospectus supplement is March24, 2026. Each of this prospectus supplement, the accompanying prospectus and any free writing prospectusauthorized by Amphenol Corporation and the Issuer co