Amphenol Technologies Files 424B3 Prospectus Update

TL;DR

**Amphenol Technologies just updated its prospectus for future offerings.**

AI Summary

This 424B3 filing, dated March 24, 2026, by Amphenol Technologies Holding GmbH, is a prospectus related to a previously filed registration statement (File No. 333-293923-01). It indicates that Amphenol Corp /DE/ (CIK: 0000820313) is also involved, sharing the same business address at 358 Hall Avenue, Wallingford, CT 06492. This filing is important for investors as it updates the terms under which securities may be offered, providing current information for potential buyers or existing shareholders.

Why It Matters

This filing updates the public on potential future securities offerings, which could impact share dilution or capital structure for Amphenol Corp /DE/ and its subsidiary.

Risk Assessment

Risk Level: low — This is a routine prospectus filing, not an event that inherently carries high risk, but rather provides information about potential future events.

Analyst Insight

Investors should review the full prospectus to understand the specific terms of any potential future securities offerings and assess their impact on existing shares.

Key Numbers

• 0002114624 — CIK for Amphenol Technologies Holding GmbH (Unique identifier for the filing entity)
• 0000820313 — CIK for Amphenol Corp /DE/ (Unique identifier for the parent company)
• 2026-03-24 — Filing Date (Date the prospectus was filed)

Key Players & Entities

• Amphenol Technologies Holding GmbH (company) — Filer of the 424B3 prospectus
• Amphenol Corp /DE/ (company) — Related Filer, CIK 0000820313
• 358 HALL AVE WALLINGFORD CT 06492 (dollar_amount) — Business and Mailing Address for both entities
• 2026-03-24 (dollar_amount) — Filing Date
• 333-293923-01 (dollar_amount) — File Number for Amphenol Technologies Holding GmbH
• 333-293923 (dollar_amount) — File Number for Amphenol Corp /DE/

FAQ

Key Financial Figures

• $ — ences in this prospectus supplement to "$," "dollars" and "U.S. dollars" are to t
• $500 billion — sor-related products were approximately $500 billion in 2025. Certain predecessor business

Filing Documents

• tm267510-6_424b3.htm (424B3) — 1009KB
• lg_amphenol-pn.jpg (GRAPHIC) — 13KB
• 0001104659-26-033479.txt ( ) — 1029KB

Underwriting

Underwriting Discount Proceeds to us (before expenses) Per note % % % Total € € € (1) Plus accrued interest, if any, from , 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, as operator of the Euroclear System ("Euroclear"), and Clearstream Banking, socit anonyme ("Clearstream"), on or about , 2026. Joint Book-Running Managers Barclays Citigroup Commerzbank HSBC BofA Securities Goldman Sachs & Co. LLC TD Securities Senior Co-Manager US Bancorp Co-Managers Loop Capital Markets Siebert Williams Shank The date of this prospectus supplement is , 2026. TABLE OF CONTENTS Each of this prospectus supplement, the accompanying prospectus and any free writing prospectus authorized by Amphenol Corporation and the Issuer contains and incorporates by reference information that you should consider when making your investment decision. Amphenol Corporation and the Issuer have not, and the underwriters have not, authorized anyone to provide you with different 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 accompanying prospectus, any free writing prospectus and the documents incorporated by reference herein and therein, is accurate only as of their respective dates. Our business, financial condition, results of operations and prospects may have changed since those dates. Amphenol Corporation and the Issuer are not, and the underwriters are not, making an offer to sell the notes in any jurisdiction where the offer or sale is not permitted. TABLE OF CONTENTS Prospectus Supplement Page ABOUT THIS PROSPECTUS SUPPLEMENT S-iii

FORWARD-LOOKING STATEMENTS

FORWARD-LOOKING STATEMENTS S-vi TRADEMARKS S-vii INCORPORATION OF CERTAIN INFORMATION BY REFERENCE S-vii SUMMARY S-1

USE OF PROCEEDS

USE OF PROCEEDS S-17 CAPITALIZATION S-18 DESCRIPTION OF THE NOTES S-20 PROVISIONS RELATING TO THE NOTES WHILE REPRESENTED BY THE GLOBAL NOTES S-32 MATERIAL UNITED STATES FEDERAL INCOME TAX CONSEQUENCES S-36 MATERIAL GERMAN TAX CONSIDERATIONS S-41 CERTAIN ERISA CONSIDERATIONS S-45 CERTAIN GERMAN INSOLVENCY LAW CONSIDERATIONS S-47

UNDERWRITING

UNDERWRITING S-51 LEGAL MATTERS S-57 EXPERTS S-57 SUPPLEMENTAL LISTING AND GENERAL INFORMATION S-58 Prospectus Page ABOUT THIS PROSPECTUS 1 NOTICE TO PROSPECTIVE INVESTORS IN THE EUROPEAN ECONOMIC AREA 3

FORWARD-LOOKING STATEMENTS

FORWARD-LOOKING STATEMENTS 4 WHERE YOU CAN FIND MORE INFORMATION 4 INCORPORATION OF CERTAIN INFORMATION BY REFERENCE 5

RISK FACTORS

RISK FACTORS 6 AMPHENOL CORPORATION 7 AMPHENOL TECHNOLOGIES HOLDING GMBH 8 S-i TABLE OF CONTENTS Page ENFORCEMENT OF CIVIL LIABILITIES 9

USE OF PROCEEDS

USE OF PROCEEDS 11 GUARANTOR DISCLOSURES 12 DESCRIPTION OF SENIOR DEBT SECURITIES 13 DESCRIPTION OF GUARANTEES 25 GLOBAL SECURITIES 26 PLAN OF DISTRIBUTION 30 LEGAL MATTERS 32 EXPERTS 32 S-ii TABLE OF CONTENTS ABOUT THIS PROSPECTUS SUPPLEMENT This prospectus supplement supplements the accompanying prospectus. The accompanying prospectus is part of an automatic shelf registration statement on Form S-3 that we filed with the Securities and Exchange Commission (the "SEC") under the Securities Act of 1933, as amended (the "Securities Act"), using a "shelf" registration, or continuous offering, process. Under this shelf registration process, we may, at any time and from time to time, issue and sell, in one or more offerings, the senior debt securities, including the notes and the related Guarantee, described in the accompanying prospectus. The accompanying prospectus provides you with a general description of the senior debt securities and the guarantees, and this prospectus supplement contains specific information about the terms of this offering of the notes and the Guarantee. This prospectus supplement, or the information incorporated by reference in this prospectus supplement or the accompanying prospectus, may add, update or change information contained in the accompanying prospectus. If information in this prospectus supplement, or the information incorporated by reference in this prospectus supplement, is inconsistent with the accompanying prospectus, this prospectus supplement, or the information incorporated by reference in this prospectus supplement, will apply and will modify or supersede that information in the accompanying prospectus. Pursuant to Rule 3-10 of Regulation S-X, separate consolidated financial statements of Amphenol Technologies Holding GmbH have not been presented. As permitted under Rule 13-01(a)(4)(vi) of Regulation S-X, we have excluded the combined summarized financial information of Amphenol Corpor

FORWARD-LOOKING STATEMENTS

FORWARD-LOOKING STATEMENTS This prospectus supplement, the accompanying prospectus and the documents incorporated by reference herein and therein, include forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 and the provisions of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Such forward-looking statements are based on our management's assumptions and beliefs about future events or circumstances using information currently available, and as a result, they are subject to risks and uncertainties. Forward-looking statements address events or developments that we expect or believe may or will occur in the future. These forward-looking statements, which address our expected business and financial performance and financial condition, among other matters, may contain words and terms such as: "anticipate," "believe," "continue," "could," "estimate," "expect," "forecast," "guidance," "intend," "look ahead," "may," "ongoing," "optimistic," "plan," "potential," "predict," "project," "seek," "should," "target," "will" or "would" and other words and terms of similar meaning. Forward-looking statements by their nature address matters that are, to different degrees, uncertain, such as statements about expected earnings, revenues, growth, liquidity, effective tax rate, interest rates, the expected timing for the closing of certain acquisitions or other matters. Although we believe the expectations reflected in all forward-looking statements are based upon reasonable assumptions, the expectations may not be attained or there may be material deviation. Readers and investors are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date on which they are made. There are risks and uncertainties that could cause actual results to differ materially from these forward-looking statements. A d

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