APH: Material agreement · New financial obligation

Item 1.01 Entry into a Material Definitive Agreement. On May 12, 2026, Amphenol Corporation (the “Company”) issued and sold €600,000,000 aggregate principal amount of the Company’s 3.375% Senior Notes due 2029 (the “2029 Notes”) and €500,000,000 aggregate principal amount of the Company’s 3.875% Senior Notes due 2034 (the “2034 Notes” and, together with the 2029 Notes, the “Notes”), pursuant to the Company’s Registration Statement on Form S-3 (No. 333-293923) (the “Registration Statement”), including the related prospectus dated March 2, 2026, as supplemented by the prospectus supplement dated May 5, 2026. The Notes were sold in an underwritten public offering pursuant to an underwriting agreement, dated May 5, 2026, by and between the Company and Barclays Bank PLC, Citigroup Global Markets Limited, Commerzbank Aktiengesellschaft, HSBC Bank plc, BNP PARIBAS, J.P. Morgan Securities plc, Mizuho International plc, Standard Chartered Bank, ING Bank N.V., Belgian Branch and Siebert Williams Shank & Co., LLC. The Company received net proceeds from the offering of the Notes, after deducting the underwriting discounts and estimated offering expenses payable by the Company, of approximately €1,093.1 million. The Company intends to use the net proceeds from the offering of the Notes to repay borrowings under its U.S. commercial paper program and its 364-day unsecured delayed draw term loan credit agreement, and for general corporate purposes. The Notes were issued pursuant to an indenture dated as of March 16, 2023 (the “Indenture”) between the Company and U.S. Bank Trust Company, National Association, as trustee, and certain of the terms of each series of the Notes were established pursuant to a certificate issued by officers of the Company dated May 12, 2026 (the “Officers’ Cer