APH / Amphenol Corporation - SEC-Einreichungen, Jahresbericht, Proxy Statement

Amphenol Corporation Conflict Minerals Report For The Year Ended December 31, 2025

Exhibit 1.01 Amphenol Corporation Conflict Minerals Report For The Year Ended December 31, 2025 This report (this “Conflict Minerals Report”) for the year ended December 31, 2025 is presented to comply with Rule 13p-1 under the Securities Exchange Act of 1934, as amended, and Form SD (collectively, the “Rule”). The Rule was adopted by the Securities and Exchange Commission (the “SEC”) to implement

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Amphenol Corporation (Exact Name of Registrant as Specified in Charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Amphenol Corporation (Exact Name of Registrant as Specified in Charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation or organization) (Commission File Number) (I.R.S. Employer Identification No.) 358 Hall Avenue, Wallingford, Connecticut 06492 (Address of Princ

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 21, 2026 AMPHENOL CORPORATION

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 21, 2026 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File Nu

NYSE CERTIFICATION

New York Stock Exchange 11 Wall Street New York, NY 10005 Tel: +1 212.656.3000 nyse.com May 15, 2026 Chief, Information Technology Securities and Exchange Commission Division of Corporate Finance 100 F Street, NE MS 3040 Washington, DC 20549 To whom it may concern: The New York Stock Exchange certifies its approval for listing and registration of the following securities of AMPHENOL CORPORATION, u

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 AMPHENOL CORPORATION (Exact Name of Registrant as

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 AMPHENOL CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 1-10879 22-2785165 (State or Other Jurisdiction of Incorporation) (Commission File Number) (I.

AMPHENOL CORPORATION 3.375% SENIOR NOTES DUE 2029

Exhibit 4.3 THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE COMMON DEPOSITARY OR A NOMINEE OF THE COMMON DEPOSITARY. THIS NOTE IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE COMMON DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSF

AMPHENOL CORPORATION OFFICERS’ CERTIFICATE Pursuant to Section 2.2 of the Indenture

Exhibit 4.2 Execution Version AMPHENOL CORPORATION OFFICERS’ CERTIFICATE Pursuant to Section 2.2 of the Indenture Reference is made to the Indenture (the “Indenture”), dated as of March 16, 2023, between Amphenol Corporation, a Delaware corporation (the “Company”), and U.S. Bank Trust Company, National Association, as trustee (the “Trustee”). Capitalized terms used but not otherwise defined herein

AMPHENOL CORPORATION 3.875% SENIOR NOTES DUE 2034

Exhibit 4.4 THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE COMMON DEPOSITARY OR A NOMINEE OF THE COMMON DEPOSITARY. THIS NOTE IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE COMMON DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSF

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 12, 2026 AMPHENOL CORPORATION

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 12, 2026 AMPHENOL CORPORATION (Exact name of registrant as specified in charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File Number

Security Type

Calculation of Filing Fee Tables S-3 AMPHENOL CORP /DE/ Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Debt 3.

AMPHENOL CORPORATION €600,000,000 3.375% Senior Notes due 2029 €500,000,000 3.875% Senior Notes due 2034

TABLE OF CONTENTS  Filed Pursuant to Rule 424(b)(5)  Registration No. 333-293923 PROSPECTUS SUPPLEMENT (To Prospectus dated March 2, 2026) 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 €500,000,000 aggregate principal amount o

AMPHENOL CORPORATION €600,000,000 3.375% Senior Notes due 2029 €500,000,000 3.875% Senior Notes due 2034 UNDERWRITING AGREEMENT May 5, 2026 Underwriting Agreement

Exhibit 1.1 AMPHENOL CORPORATION €600,000,000 3.375% Senior Notes due 2029 €500,000,000 3.875% Senior Notes due 2034 UNDERWRITING AGREEMENT May 5, 2026 Underwriting Agreement May 5, 2026 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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported) May 5, 2026 AMPHENOL CORPORATION (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported) May 5, 2026 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File Numb

AMPHENOL ANNOUNCES PRICING OF EURO-DENOMINATED SENIOR NOTES OFFERINGS

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL ANNOUNCES PRICING OF EURO-DENOMINATED SENIOR NOTES OFFERINGS Wallingford, Connecticut, May 5, 2026. Amphenol Corporation (NYSE: APH) (the “Company”) announced today the pricing of its offering of €600 million aggregate principal amount of senior notes due 2029 (the “2029 No

SUBJECT TO COMPLETION PRELIMINARY PROSPECTUS SUPPLEMENT DATED MAY 5, 2026

TABLE OF CONTENTS The information in this preliminary prospectus supplement is not complete and may be changed.

AMPHENOL CORPORATION Final Term Sheet May 5, 2026

Filed Pursuant to Rule 433 Registration Statement No. 333- 293923 May 5, 2026 AMPHENOL CORPORATION Final Term Sheet May 5, 2026 Issuer: Amphenol Corporation (the “Company”) Legal Entity Identifier (LEI) Code: 549300D3L3G0R4U4VT04 Expected Ratings (Moody’s / S&P)*: A3 (Stable) /A- (Positive) Trade Date: May 5, 2026 Settlement Date**: May 12, 2026 (T+5) Description of the Securities: 3.375% Senior N

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2026 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 29, 2026 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File

AMPHENOL REPORTS RECORD FIRST QUARTER 2026 RESULTS

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL REPORTS RECORD FIRST QUARTER 2026 RESULTS First Quarter 2026 Highlights: ● Sales of $7.6 billion, up 58% in U.S. dollars and 33% organically compared to the first quarter of 2025 ● Orders of $9.4 billion, resulting in a book-to-bill of 1.24:1 ● GAAP Diluted EPS of $0.72, up

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule

ARS

2025 ANNUAL REPORT Enabling the Electronics RevolutionCUMULATIVE 5-YEAR TOTAL SHAREHOLDER RETURN Amphenol Corporation Dow Jones U.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   ) Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Def

AMPHENOL TECHNOLOGIES HOLDING GMBH AMPHENOL CORPORATION OFFICERS’ CERTIFICATE Pursuant to Section 2.2 of the Indenture

Exhibit 4.2 Execution Version AMPHENOL TECHNOLOGIES HOLDING GMBH AMPHENOL CORPORATION OFFICERS’ CERTIFICATE Pursuant to Section 2.2 of the Indenture Reference is made to the Indenture (the “Indenture”), dated as of March 30, 2026, among Amphenol Technologies Holding GmbH, a German limited liability company (Gesellschaft mit beschränkter Haftung), as issuer (the “Issuer”), Amphenol Corporation, a D

Amphenol Technologies Holding GmbH 3.625% Senior Notes due 2031

Exhibit 4.3 THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE COMMON DEPOSITARY OR A NOMINEE OF THE COMMON DEPOSITARY. THIS NOTE IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE COMMON DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSF

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 30, 2026 AMPHENOL CORPORATI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 30, 2026 AMPHENOL CORPORATION (Exact name of registrant as specified in charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File Numb

INDENTURE, dated as of March 30, 2026 AMPHENOL TECHNOLOGIES HOLDING GMBH, as Issuer AMPHENOL CORPORATION, as Guarantor U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee

Exhibit 4.1 Execution Version INDENTURE, dated as of March 30, 2026 among AMPHENOL TECHNOLOGIES HOLDING GMBH, as Issuer AMPHENOL CORPORATION, as Guarantor and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee CONTENTS Page Article I DEFINITIONS AND INCORPORATION BY REFERENCE 1 Section 1.1 Definitions 1 Section 1.2 Incorporation by Reference of Trust Indenture Act 7 Section 1.3 Rules of Con

Connectivity and Cable Solutions Combined Financial Statements Years Ended December 31, 2025 and 2024

Exhibit 99.1 Combined Financial Statements Connectivity and Cable Solutions Years Ended December 31, 2025 and 2024 With Report of Independent Auditors Connectivity and Cable Solutions Combined Financial Statements Years Ended December 31, 2025 and 2024 Contents Report of Independent Auditors 1 Combined Financial Statements Combined Statements of Operations 3 Combined Statements of Comprehensive In

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

Exhibit 99.2 UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION On January 9, 2026 (the “Closing Date”), pursuant to the purchase agreement announced on August 4, 2025, Amphenol Corporation (“Amphenol” or the “Company”), completed the acquisition of the Connectivity and Cable Solutions Business (“CommScope”) from Vistance Networks, Inc. (“Vistance,” formerly known as CommScope Holding Co

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 9, 2026 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporati

AMPHENOL CORPORATION UNAUDITED SUPPLEMENTAL NON-GAAP FINANCIAL INFORMATION (dollars in millions, except per share data)

Exhibit 99.3 AMPHENOL CORPORATION UNAUDITED SUPPLEMENTAL NON-GAAP FINANCIAL INFORMATION (dollars in millions, except per share data) Amphenol Corporation (the “Company”) is furnishing the following information on pro forma non-GAAP measures of the Company for the year ended December 31, 2025, to supplement the audited combined financial statements of the Connectivity and Cable Solutions business (

AMPHENOL TECHNOLOGIES HOLDING GmbH €500,000,000 3.625% Senior Notes due 2031 Guaranteed on a Senior Unsecured Basis by AMPHENOL CORPORATION

TABLE OF CONTENTS  Filed Pursuant to Rule 424(b)(5)  Registration No. 333-293923  333-293923-01 PROSPECTUS SUPPLEMENT (To Prospectus dated March 2, 2026) AMPHENOL TECHNOLOGIES HOLDING GmbH €500,000,000 3.625% Senior Notes due 2031 Guaranteed on a Senior Unsecured Basis by AMPHENOL CORPORATION Amphenol Technologies Holding GmbH (the “Issuer”) is offering €500,000,000 aggregate principal amount of 3

Security Type

Calculation of Filing Fee Tables S-3 AMPHENOL CORP /DE/ Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Debt 3.

AMPHENOL TECHNOLOGIES HOLDING GmbH €500,000,000 3.625% Senior Notes due 2031 Guaranteed on a Senior Unsecured Basis by AMPHENOL CORPORATION

TABLE OF CONTENTS  Filed Pursuant to Rule 424(b)(5)  Registration No. 333-293923  333-293923-01 PROSPECTUS SUPPLEMENT (To Prospectus dated March 2, 2026) AMPHENOL TECHNOLOGIES HOLDING GmbH €500,000,000 3.625% Senior Notes due 2031 Guaranteed on a Senior Unsecured Basis by AMPHENOL CORPORATION Amphenol Technologies Holding GmbH (the “Issuer”) is offering €500,000,000 aggregate principal amount of 3

Security Type

Calculation of Filing Fee Tables S-3 AMPHENOL CORP /DE/ Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Debt 3.

AMPHENOL TECHNOLOGIES HOLDING GMBH €500,000,000 3.625% Senior Notes due 2031 UNDERWRITING AGREEMENT March 24, 2026 Underwriting Agreement

Exhibit 1.1 Execution Version AMPHENOL TECHNOLOGIES HOLDING GMBH €500,000,000 3.625% Senior Notes due 2031 UNDERWRITING AGREEMENT March 24, 2026 Underwriting Agreement March 24, 2026 BARCLAYS BANK PLC CITIGROUP GLOBAL MARKETS EUROPE AG Commerzbank Aktiengesellschaft HSBC BANK PLC BofA Securities Europe SA Goldman Sachs & Co. LLC TD Global Finance unlimited company U.S. BANCORP INVESTMENTS, INC. Lo

AMPHENOL CORPORATION ANNOUNCES PRICING OF EURO-DENOMINATED SENIOR NOTES OFFERING

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL CORPORATION ANNOUNCES PRICING OF EURO-DENOMINATED SENIOR NOTES OFFERING Wallingford, Connecticut, March 24, 2026. Amphenol Corporation (NYSE: APH) (the “Company”) announced today the pricing of an offering of €500 million aggregate principal amount of senior notes due 2031

SUBJECT TO COMPLETION PRELIMINARY PROSPECTUS SUPPLEMENT DATED MARCH 24, 2026

TABLE OF CONTENTS The information in this preliminary prospectus supplement is not complete and may be changed.

SUBJECT TO COMPLETION PRELIMINARY PROSPECTUS SUPPLEMENT DATED MARCH 24, 2026

TABLE OF CONTENTS The information in this preliminary prospectus supplement is not complete and may be changed.

AMPHENOL TECHNOLOGIES HOLDING GMBH Final Term Sheet March 24, 2026

Filed Pursuant to Rule 433 Registration Statement No. 333- 293923 March 24, 2026 AMPHENOL TECHNOLOGIES HOLDING GMBH Final Term Sheet March 24, 2026 Issuer: Amphenol Technologies Holding GmbH (the “Company”) Guarantor: Amphenol Corporation (the “Guarantor”) Legal Entity Identifier (LEI) Code: 549300110BRSS7DV8V39 Expected Ratings (Moody’s / S&P)*: A3 (Stable) / A- (Stable) Trade Date: March 24, 202

AMPHENOL TECHNOLOGIES HOLDING GMBH Final Term Sheet March 24, 2026

Filed Pursuant to Rule 433 Registration Statement No. 333- 293923 March 24, 2026 AMPHENOL TECHNOLOGIES HOLDING GMBH Final Term Sheet March 24, 2026 Issuer: Amphenol Technologies Holding GmbH (the “Company”) Guarantor: Amphenol Corporation (the “Guarantor”) Legal Entity Identifier (LEI) Code: 549300110BRSS7DV8V39 Expected Ratings (Moody’s / S&P)*: A3 (Stable) / A- (Stable) Trade Date: March 24, 202

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported) March 24, 2026 AMPHENOL CORPORATIO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported) March 24, 2026 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File N

INDENTURE, dated as of [·], 2026 AMPHENOL TECHNOLOGIES HOLDING GMBH, as Issuer AMPHENOL CORPORATION, as Guarantor U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee

Exhibit 4.2 INDENTURE, dated as of [·], 2026 among AMPHENOL TECHNOLOGIES HOLDING GMBH, as Issuer AMPHENOL CORPORATION, as Guarantor and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee CONTENTS Page Article I DEFINITIONS AND INCORPORATION BY REFERENCE 1 Section 1.1 Definitions 1 Section 1.2 Incorporation by Reference of Trust Indenture Act 7 Section 1.3 Rules of Construction 8 Article II

INDENTURE, dated as of [·], 2026 AMPHENOL TECHNOLOGIES HOLDING GMBH, as Issuer AMPHENOL CORPORATION, as Guarantor U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee

Exhibit 4.2 INDENTURE, dated as of [·], 2026 among AMPHENOL TECHNOLOGIES HOLDING GMBH, as Issuer AMPHENOL CORPORATION, as Guarantor and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee CONTENTS Page Article I DEFINITIONS AND INCORPORATION BY REFERENCE 1 Section 1.1 Definitions 1 Section 1.2 Incorporation by Reference of Trust Indenture Act 7 Section 1.3 Rules of Construction 8 Article II

Security Type

Calculation of Filing Fee Tables S-3 AMPHENOL CORP /DE/ Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Debt Amphenol Corporation Debt Securities 457(r) 0.

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 Statement of Eligibility Under The Trust Indenture Act of 1939 of a Corporation Designated to Act as Trustee Check if an Application to Determine Eligibility of a Trustee Pursuant to

Exhibit 25.2 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 Statement of Eligibility Under The Trust Indenture Act of 1939 of a Corporation Designated to Act as Trustee Check if an Application to Determine Eligibility of a Trustee Pursuant to Section 305(b)(2) ¨ U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (Exact name of Trustee as specified in its charter) 91-1821036 I.R.S. E

Security Type

Calculation of Filing Fee Tables S-3 AMPHENOL CORP /DE/ Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Debt Amphenol Corporation Debt Securities 457(r) 0.

The following subsidiary of Amphenol Corporation (“

Exhibit 22 The following subsidiary of Amphenol Corporation (“Amphenol”) will be the issuer of senior debt securities under the indenture to be entered into among Amphenol, as guarantor, and the subsidiary listed below. Subsidiary Jurisdiction of Organization Amphenol Technologies Holding GmbH Germany

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 Statement of Eligibility Under The Trust Indenture Act of 1939 of a Corporation Designated to Act as Trustee Check if an Application to Determine Eligibility of a Trustee Pursuant to

Exhibit 25.2 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 Statement of Eligibility Under The Trust Indenture Act of 1939 of a Corporation Designated to Act as Trustee Check if an Application to Determine Eligibility of a Trustee Pursuant to Section 305(b)(2) ¨ U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (Exact name of Trustee as specified in its charter) 91-1821036 I.R.S. E

As filed with the Securities and Exchange Commission on March 2, 2026

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on March 2, 2026 Registration No.

The following subsidiary of Amphenol Corporation (“

Exhibit 22 The following subsidiary of Amphenol Corporation (“Amphenol”) will be the issuer of senior debt securities under the indenture to be entered into among Amphenol, as guarantor, and the subsidiary listed below. Subsidiary Jurisdiction of Organization Amphenol Technologies Holding GmbH Germany

As filed with the Securities and Exchange Commission on March 2, 2026

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on March 2, 2026 Registration No.

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 Statement of Eligibility Under The Trust Indenture Act of 1939 of a Corporation Designated to Act as Trustee Check if an Application to Determine Eligibility of a Trustee Pursuant to

Exhibit 25.1 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 Statement of Eligibility Under The Trust Indenture Act of 1939 of a Corporation Designated to Act as Trustee Check if an Application to Determine Eligibility of a Trustee Pursuant to Section 305(b)(2) ¨ U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (Exact name of Trustee as specified in its charter) 91-1821036 I.R.S. E

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 Statement of Eligibility Under The Trust Indenture Act of 1939 of a Corporation Designated to Act as Trustee Check if an Application to Determine Eligibility of a Trustee Pursuant to

Exhibit 25.1 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 Statement of Eligibility Under The Trust Indenture Act of 1939 of a Corporation Designated to Act as Trustee Check if an Application to Determine Eligibility of a Trustee Pursuant to Section 305(b)(2) ¨ U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (Exact name of Trustee as specified in its charter) 91-1821036 I.R.S. E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31, 2025 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1-1087

FOURTEENTH AMENDMENT (2025-SECOND) TO THE PENSION PLAN FOR EMPLOYEES OF AMPHENOL CORPORATION AS AMENDED AND RESTATED EFFECTIVE JANUARY 1, 2016

Exhibit 10.21 FOURTEENTH AMENDMENT (2025-SECOND) TO THE PENSION PLAN FOR EMPLOYEES OF AMPHENOL CORPORATION AS AMENDED AND RESTATED EFFECTIVE JANUARY 1, 2016 Pursuant to Section 12.1 of the Pension Plan for Employees of Amphenol Corporation as amended and restated effective January 1, 2016 (the "Plan"), the Plan is hereby amended as follows, effective January 1, 2026: 1.Exhibit D (Chatham Cable) is

Description of the Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 DESCRIPTION OF COMMON STOCK

Exhibit 4.14 Description of the Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 DESCRIPTION OF COMMON STOCK The following description of the capital stock of Amphenol Corporation (“Amphenol,” the “Company,” “us” or “we”) is a summary and does not purport to be complete. It is subject to and qualified in its entirety by reference to the Company’s Res

AMENDMENT EXECUTION PAGE

Exhibit 10.32 AMENDMENT EXECUTION PAGE Plan Name:Amphenol Corporation Employee Savings/401(k) Plan (the “Plan”) Employer:Amphenol Corporation [Note: These execution pages are to be completed in the event the Employer modifies any prior election(s) or makes a new election(s) in this Adoption Agreement. Attach the amended page(s) of the Adoption Agreement to these execution pages.] The following sec

Amphenol Corporation Listing of Subsidiaries as of December 31, 2025

Exhibit 21.1 Amphenol Corporation Listing of Subsidiaries as of December 31, 2025 State or other Jurisdiction Name of Subsidiary of Incorporation 3395 Walden Avenue Acquisition Corp. New York, U.S.A. ABA Medical Technology (Dongguan) Co. Ltd China Accumetrics, Inc. New York, U.S.A. Add-On Computer Peripherals LLC California, U.S.A. Advantage Medical Electronics, LLC Delaware, U.S.A. Airmar EMEA EU

AMPHENOL MANAGEMENT INCENTIVE PLAN

Exhibit 10.26 2026 AMPHENOL MANAGEMENT INCENTIVE PLAN I. Purpose The purpose of the 2026 Management Incentive Plan (the “2026 Incentive Plan”) is to reward eligible key management personnel of Amphenol Corporation and affiliated operations with performance-based cash bonus payments provided certain goals are achieved. II. Eligibility Generally, participation includes senior management positions, c

THIRTEENTH AMENDMENT (2025-FIRST) TO THE PENSION PLAN FOR EMPLOYEES OF AMPHENOL CORPORATION AS AMENDED AND RESTATED EFFECTIVE JANUARY 1, 2016

Exhibit 10.20 THIRTEENTH AMENDMENT (2025-FIRST) TO THE PENSION PLAN FOR EMPLOYEES OF AMPHENOL CORPORATION AS AMENDED AND RESTATED EFFECTIVE JANUARY 1, 2016 Pursuant to Section 12.1 of the Pension Plan for Employees of Amphenol Corporation as amended and restated effective January 1, 2016 (the "Plan"), the Plan is hereby amended as follows, effective January 1, 2026: 1.Exhibit H (Sidney Hourly) is

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 4, 2026 AMPHENOL CORPORA

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 4, 2026 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission Fil

AMPHENOL ANNOUNCES BOARD SUCCESSION PLAN

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL ANNOUNCES BOARD SUCCESSION PLAN Wallingford, Connecticut, February 4, 2026. Amphenol Corporation (NYSE: APH) today announced that the Board of Directors has appointed R. Adam Norwitt, currently serving as President and Chief Executive Officer, to the additional role of Chai

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 28, 2026 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission Fil

AMPHENOL REPORTS RECORD FOURTH QUARTER AND FULL YEAR 2025 RESULTS

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL REPORTS RECORD FOURTH QUARTER AND FULL YEAR 2025 RESULTS Fourth Quarter 2025 Highlights: ● Sales of $6.4 billion, up 49% in U.S. dollars and 37% organically compared to the fourth quarter of 2024 ● GAAP Diluted EPS of $0.93, up 58% compared to prior year ● Adjusted Diluted

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 9, 2026 AMPHENOL CORPORAT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 9, 2026 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File

AMPHENOL COMPLETES ACQUISITION OF CCS BUSINESS FROM COMMSCOPE

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL COMPLETES ACQUISITION OF CCS BUSINESS FROM COMMSCOPE Wallingford, Connecticut, January 12, 2026. Amphenol Corporation (NYSE: APH) today announced that it has completed its previously announced acquisition of CommScope’s (NASDAQ: COMM) Connectivity and Cable Solutions (CCS)

AMPHENOL APPOINTS SANJIV LAMBA TO BOARD OF DIRECTORS

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL APPOINTS SANJIV LAMBA TO BOARD OF DIRECTORS Wallingford, Connecticut. January 8, 2026. Amphenol Corporation (NYSE: APH) today announced that Sanjiv Lamba has been appointed to Amphenol’s board of directors. With his appointment, the size of the Company’s board has increased

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 8, 2026 AMPHENOL CORPORAT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 8, 2026 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 10, 2025 AMPHENOL CORPOR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 10, 2025 AMPHENOL CORPORATION (Exact name of registrant as specified in charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File N

AMPHENOL CORPORATION 5.300% SENIOR NOTES DUE 2055

Exhibit 4.9 THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITARY OR A NOMINEE OF THE DEPOSITARY. THIS NOTE IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSFERRED EXCEPT AS A WHO

AMPHENOL CORPORATION FLOATING RATE NOTES DUE 2027

Exhibit 4.3 THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITARY OR A NOMINEE OF THE DEPOSITARY. THIS NOTE IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSFERRED EXCEPT AS A WHO

AMPHENOL CORPORATION OFFICERS’ CERTIFICATE Pursuant to Section 2.2 of the Indenture

Exhibit 4.2 Execution Version AMPHENOL CORPORATION OFFICERS’ CERTIFICATE Pursuant to Section 2.2 of the Indenture Reference is made to the Indenture (the “Indenture”), dated as of March 16, 2023, between Amphenol Corporation, a Delaware corporation (the “Company”), and U.S. Bank Trust Company, National Association, as trustee (the “Trustee”). Capitalized terms used but not otherwise defined herein

AMPHENOL CORPORATION 4.125% SENIOR NOTES DUE 2030

Exhibit 4.6 THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITARY OR A NOMINEE OF THE DEPOSITARY. THIS NOTE IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSFERRED EXCEPT AS A WHO

AMPHENOL CORPORATION 3.800% SENIOR NOTES DUE 2027

Exhibit 4.4 THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITARY OR A NOMINEE OF THE DEPOSITARY. THIS NOTE IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSFERRED EXCEPT AS A WHO

AMPHENOL CORPORATION 3.900% SENIOR NOTES DUE 2028

Exhibit 4.5 THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITARY OR A NOMINEE OF THE DEPOSITARY. THIS NOTE IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSFERRED EXCEPT AS A WHO

AMPHENOL CORPORATION 4.400% SENIOR NOTES DUE 2033

Exhibit 4.7 THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITARY OR A NOMINEE OF THE DEPOSITARY. THIS NOTE IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSFERRED EXCEPT AS A WHO

AMPHENOL CORPORATION 4.625% SENIOR NOTES DUE 2036

Exhibit 4.8 THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITARY OR A NOMINEE OF THE DEPOSITARY. THIS NOTE IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSFERRED EXCEPT AS A WHO

AMPHENOL CORPORATION $500,000,000 Floating Rate Senior Notes due 2027 $750,000,000 3.800% Senior Notes due 2027 $750,000,000 3.900% Senior Notes due 2028 $1,000,000,000 4.125% Senior Notes due 2030 $1,250,000,000 4.400% Senior Notes due 2033 $1,600,0

Exhibit 1.1 AMPHENOL CORPORATION $500,000,000 Floating Rate Senior Notes due 2027 $750,000,000 3.800% Senior Notes due 2027 $750,000,000 3.900% Senior Notes due 2028 $1,000,000,000 4.125% Senior Notes due 2030 $1,250,000,000 4.400% Senior Notes due 2033 $1,600,000,000 4.625% Senior Notes due 2036 $1,650,000,000 5.300% Senior Notes due 2055 UNDERWRITING AGREEMENT October 27, 2025 Underwriting Agree

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported) October 27, 2025 AMPHENOL CORPORAT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported) October 27, 2025 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File

AMPHENOL CORPORATION ANNOUNCES PRICING OF SENIOR NOTES OFFERINGS

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL CORPORATION ANNOUNCES PRICING OF SENIOR NOTES OFFERINGS Wallingford, Connecticut, October 27, 2025. Amphenol Corporation (NYSE: APH) (the “Company”) announced today the pricing of its offering of $500 million aggregate principal amount of floating rate senior notes due 2027

AMPHENOL CORPORATION $500,000,000 Floating Rate Senior Notes due 2027 $750,000,000 3.800% Senior Notes due 2027 $750,000,000 3.900% Senior Notes due 2028 $1,000,000,000 4.125% Senior Notes due 2030 $1,250,000,000 4.400% Senior Notes due 2033 $1,600,0

TABLE OF CONTENTS  Filed Pursuant to Rule 424(b)(5)  Registration No. 333-270605 PROSPECTUS SUPPLEMENT (To Prospectus dated March 16, 2023) AMPHENOL CORPORATION $500,000,000 Floating Rate Senior Notes due 2027 $750,000,000 3.800% Senior Notes due 2027 $750,000,000 3.900% Senior Notes due 2028 $1,000,000,000 4.125% Senior Notes due 2030 $1,250,000,000 4.400% Senior Notes due 2033 $1,600,000,000 4.6

Security Type

Calculation of Filing Fee Tables S-3 AMPHENOL CORP /DE/ Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Debt Floating Rate Notes due 2027 457(r) 500,000,000 $ 500,000,000.

AMPHENOL CORPORATION Final Term Sheet October 27, 2025

Filed Pursuant to Rule 433 Registration Statement No. 333- 270605 October 27, 2025 AMPHENOL CORPORATION Final Term Sheet October 27, 2025 Issuer: Amphenol Corporation (the “Company”) Expected Ratings (Moody’s / S&P)*: A3 / A- (Stable / Stable) Trade Date: October 27, 2025 Settlement Date**: November 10, 2025 (T+10) Floating Rate Senior Notes due 2027 (the “Floating Rate Notes”) 3.800% Senior Notes

SUBJECT TO COMPLETION PRELIMINARY PROSPECTUS SUPPLEMENT DATED OCTOBER 27, 2025

TABLE OF CONTENTS The information in this preliminary prospectus supplement is not complete and may be changed.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file numbe

AMPHENOL REPORTS RECORD THIRD QUARTER 2025 RESULTS AND ANNOUNCES DIVIDEND INCREASE

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL REPORTS RECORD THIRD QUARTER 2025 RESULTS AND ANNOUNCES DIVIDEND INCREASE Third Quarter 2025 Highlights: ● Sales of $6.2 billion, up 53% in U.S. dollars and 41% organically compared to the third quarter of 2024 ● GAAP Diluted EPS of $0.97, up 102% compared to prior year ● A

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 22, 2025 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission Fil

144

144 0002006947 XXXXXXXX LIVE 0000820313 AMPHENOL CORPORATION 001-10879 358 Hall Avenue Wallingford CT 06492 203-265-8900 PETER JOHN STRAUB Officer Common Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004 88000 9735941.

THREE-YEAR TERM LOAN CREDIT AGREEMENT dated as of August 22, 2025 AMPHENOL CORPORATION, as the Borrower THE SUBSIDIARIES PARTY HERETO, as Subsidiary Guarantors The Lenders Party Hereto, JPMORGAN CHASE BANK, N.A., as Administrative Agent BNP PARIBAS S

Exhibit 10.1 Execution Version THREE-YEAR TERM LOAN CREDIT AGREEMENT dated as of August 22, 2025 among AMPHENOL CORPORATION, as the Borrower THE SUBSIDIARIES PARTY HERETO, as Subsidiary Guarantors The Lenders Party Hereto, and JPMORGAN CHASE BANK, N.A., as Administrative Agent BNP PARIBAS SECURITIES CORP. and MIZUHO BANK, LTD., as Co-Syndication Agents and BANK OF AMERICA, N.A., BARCLAYS BANK PLC,

364-DAY TERM LOAN CREDIT AGREEMENT dated as of August 22, 2025 AMPHENOL CORPORATION, as the Borrower THE SUBSIDIARIES PARTY HERETO, as Subsidiary Guarantors The Lenders Party Hereto, JPMORGAN CHASE BANK, N.A., as Administrative Agent BNP PARIBAS SECU

Exhibit 10.2 Execution Version 364-DAY TERM LOAN CREDIT AGREEMENT dated as of August 22, 2025 among AMPHENOL CORPORATION, as the Borrower THE SUBSIDIARIES PARTY HERETO, as Subsidiary Guarantors The Lenders Party Hereto, and JPMORGAN CHASE BANK, N.A., as Administrative Agent BNP PARIBAS SECURITIES CORP. and MIZUHO BANK, LTD., as Co-Syndication Agents and BANK OF AMERICA, N.A., BARCLAYS BANK PLC, CI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 22, 2025 AMPHENOL CORPORAT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 22, 2025 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 4, 2025 AMPHENOL CORPORATI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 4, 2025 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File

AMPHENOL CORPORATION TO ACQUIRE CONNECTIVITY AND CABLE SOLUTIONS BUSINESS FROM COMMSCOPE

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL CORPORATION TO ACQUIRE CONNECTIVITY AND CABLE SOLUTIONS BUSINESS FROM COMMSCOPE Transaction highlights: · To acquire CommScope’s Connectivity and Cable Solutions business for $10.5 billion in cash · Adds significant fiber optic interconnect capabilities for the IT datacom a

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1-

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 23, 2025 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File N

AMPHENOL REPORTS RECORD SECOND QUARTER 2025 RESULTS

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL REPORTS RECORD SECOND QUARTER 2025 RESULTS Second Quarter 2025 Highlights: ● Sales of $5.7 billion, up 57% in U.S. dollars and 41% organically compared to the second quarter of 2024 ● GAAP Diluted EPS of $0.86, up 110% compared to prior year ● Adjusted Diluted EPS of $0.81,

LETTER

June 25, 2025 Craig A. Lampo Senior Vice President and Chief Financial Officer Amphenol Corporation 358 Hall Avenue Wallingford, CT 06492 Re: Amphenol Corporation Form 10-K for the Fiscal Year Ended December 31, 2024 Filed February 7, 2025 File No. 001-10879 Dear Craig A. Lampo: We have completed our review of your filing. We remind you that the company and its management are responsible for the a

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Amphenol Amphenol Corporation World Headquarters 358 Hall Avenue Wallingford, CT 06492 U.

NYSE CERTIFICATION

New York Stock Exchange 11 Wall Street New York, NY 10005 Tel: +1 212.656.3000 nyse.com June 17, 2025 Chief, Information Technology Securities and Exchange Commission Division of Corporate Finance 100 F Street, NE MS 3040 Washington, DC 20549 To whom it may concern: The New York Stock Exchange certifies its approval for listing and registration of the 3.125% Senior Notes due 2032 of AMPHENOL CORPO

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 16, 2025 AMPHENOL CORPORATION (Exact name of registrant as specified in charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File Numbe

Form of Global Note for the Notes

Exhibit 4.3 THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE COMMON DEPOSITARY OR A NOMINEE OF THE COMMON DEPOSITARY. THIS NOTE IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE COMMON DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSF

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 AMPHENOL CORPORATION (Exact Name of Registrant as

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 AMPHENOL CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 1-10879 22-2785165 (State or Other Jurisdiction of Incorporation) (Commission File Number) (I.

Officers’ Certificate, dated June 16, 2025, establishing the 3.125% Senior Notes due 2032, pursuant to the Indenture (filed as Exhibit 4.2 to the Form 8-K filed on June 16, 2025).*

Exhibit 4.2 AMPHENOL CORPORATION OFFICERS’ CERTIFICATE Pursuant to Section 2.2 of the Indenture Reference is made to the Indenture (the “Indenture”), dated as of March 16, 2023, between Amphenol Corporation, a Delaware corporation (the “Company”), and U.S. Bank Trust Company, National Association, as trustee (the “Trustee”). Capitalized terms used but not otherwise defined herein shall have the re

AMPHENOL CORPORATION €600,000,000 3.125% Senior Notes due 2032

TABLE OF CONTENTS  Filed Pursuant to Rule 424(b)(5)  Registration No. 333-270605 PROSPECTUS SUPPLEMENT (To Prospectus dated March 16, 2023) AMPHENOL CORPORATION €600,000,000 3.125% Senior Notes due 2032 We are offering €600,000,000 aggregate principal amount of our 3.125% Senior Notes due 2032 (the “notes”). We will pay interest on the notes annually on June 16 of each year, beginning on June 16,

Form of Global Note for the Notes

Exhibit 4.3 THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITARY OR A NOMINEE OF THE DEPOSITARY. THIS NOTE IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSFERRED EXCEPT AS A WHO

Table 1: Newly Registered and Carry Forward Securities

Calculation of Filing Fee Tables S-3 AMPHENOL CORP /DE/ Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Debt 3.

Underwriting Agreement, dated June 11, 2025, by and between the Company and BNP PARIBAS, Citigroup Global Markets Limited, Commerzbank Aktiengesellschaft, Barclays Bank PLC, HSBC Bank plc, Mizuho International plc, The Toronto-Dominion Bank, Goldman Sachs & Co. LLC, J.P. Morgan Securities plc, ING Bank N.V. Belgian Branch, Siebert Williams Shank & Co., LLC, Standard Chartered Bank and U.S. Bancorp Investments, Inc., relating to the offer and sale of €600,000,000 aggregate principal amount of the Euro Notes.

Exhibit 1.1 AMPHENOL CORPORATION €600,000,000 3.125% Senior Notes due 2032 UNDERWRITING AGREEMENT June 11, 2025 Underwriting Agreement June 11, 2025 BNP PARIBAS CITIGROUP GLOBAL MARKETS LIMITED COMMERZBANK AKTIENGESELLSCHAFT BARCLAYS BANK PLC HSBC BANK PLC MIZUHO INTERNATIONAL PLC THE TORONTO-DOMINION BANK GOLDMAN SACHS & CO. LLC J.P. MORGAN SECURITIES PLC ING BANK N.V. BELGIAN BRANCH SIEBERT WILL

Officers’ Certificate, dated June 12, 2025, establishing the 4.375% Senior Notes due 2028, pursuant to the Indenture (filed as Exhibit 4.2 to the Form 8-K filed on June 12, 2025).*

Exhibit 4.2 AMPHENOL CORPORATION OFFICERS’ CERTIFICATE Pursuant to Section 2.2 of the Indenture Reference is made to the Indenture (the “Indenture”), dated as of March 16, 2023, between Amphenol Corporation, a Delaware corporation (the “Company”), and U.S. Bank Trust Company, National Association, as trustee (the “Trustee”). Capitalized terms used but not otherwise defined herein shall have the re

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported) June 11, 2025 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File Nu

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 12, 2025 AMPHENOL CORPORATION (Exact name of registrant as specified in charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File Numbe

AMPHENOL CORPORATION ANNOUNCES PRICING OF EURO-DENOMINATED SENIOR NOTES OFFERING

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL CORPORATION ANNOUNCES PRICING OF EURO-DENOMINATED SENIOR NOTES OFFERING Wallingford, Connecticut, June 11, 2025. Amphenol Corporation (NYSE: APH) (the “Company”) announced today the pricing of its offering of €600 million aggregate principal amount of senior notes due 2032

SUBJECT TO COMPLETION PRELIMINARY PROSPECTUS SUPPLEMENT DATED JUNE 11, 2025

TABLE OF CONTENTS The information in this preliminary prospectus supplement is not complete and may be changed.

AMPHENOL CORPORATION Final Term Sheet June 11, 2025

Filed Pursuant to Rule 433 Registration Statement No. 333- 270605 June 11, 2025 AMPHENOL CORPORATION Final Term Sheet June 11, 2025 Issuer: Amphenol Corporation (the “Company”) Legal Entity Identifier (LEI) Code: 549300D3L3G0R4U4VT04 Expected Ratings (Moody’s / S&P)*: A3 / A- (Stable / Stable) Trade Date: June 11, 2025 Settlement Date**: June 16, 2025 (T+3) 3.125% Senior Notes due 2032 Principal A

AMPHENOL CORPORATION ANNOUNCES PRICING OF USD-DENOMINATED SENIOR NOTES OFFERING

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL CORPORATION ANNOUNCES PRICING OF USD-DENOMINATED SENIOR NOTES OFFERING Wallingford, Connecticut, June 9, 2025. Amphenol Corporation (NYSE: APH) (the “Company”) announced today the pricing of its offering of $750 million aggregate principal amount of senior notes due 2028 (t

Table 1: Newly Registered and Carry Forward Securities

Calculation of Filing Fee Tables S-3 AMPHENOL CORP /DE/ Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Debt 4.

AMPHENOL CORPORATION $750,000,000 4.375% Senior Notes due 2028

TABLE OF CONTENTS  Filed Pursuant to Rule 424(b)(5)  Registration No. 333-270605 PROSPECTUS SUPPLEMENT (To Prospectus dated March 16, 2023) AMPHENOL CORPORATION $750,000,000 4.375% Senior Notes due 2028 We are offering $750,000,000 aggregate principal amount of our 4.375% Senior Notes due 2028 (the “notes”). We will pay interest on the notes semi-annually on June 12 and December 12 of each year, b

Underwriting Agreement, dated June 9, 2025, by and between the Company and Citigroup Global Markets Inc., Mizuho Securities USA LLC and TD Securities (USA) LLC, as representatives of the several Underwriters named in Schedule A thereto, relating to the offer and sale of $750,000,000 aggregate principal amount of the USD Notes.

Exhibit 1.1 AMPHENOL CORPORATION $750,000,000 4.375% Senior Notes due 2028 UNDERWRITING AGREEMENT June 9, 2025 Underwriting Agreement June 9, 2025 CITIGROUP GLOBAL MARKETS INC. MIZUHO SECURITIES USA LLC TD SECURITIES (USA) LLC As Representatives of the several Underwriters named in Schedule A hereto c/o Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 c/o Mizuho Securiti

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported) June 9, 2025 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File Num

AMPHENOL CORPORATION Final Term Sheet June 9, 2025

Filed Pursuant to Rule 433 Registration Statement No. 333- 270605 June 9, 2025 AMPHENOL CORPORATION Final Term Sheet June 9, 2025 Issuer: Amphenol Corporation (the “Company”) Expected Ratings (Moody’s / S&P)*: A3 / A- (Stable / Stable) Trade Date: June 9, 2025 Settlement Date**: June 12, 2025 (T+3) 4.375% Senior Notes due 2028 Principal Amount: $750,000,000 (the “Notes”) Maturity Date: June 12, 20

SUBJECT TO COMPLETION PRELIMINARY PROSPECTUS SUPPLEMENT DATED JUNE 9, 2025

TABLE OF CONTENTS The information in this preliminary prospectus supplement is not complete and may be changed.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Amphenol Corporation (Exact Name of Registrant as Specified in Charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorpor

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Amphenol Corporation (Exact Name of Registrant as Specified in Charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation or organization) (Commission File Number) (I.R.S. Employer Identification No.) 358 Hall Avenue, Wallingford, Connecticut 06492 (Address of Princ

Exhibit 1.01 - Conflict Minerals Report as required by Items 1.01 and 1.02 of this Form SD.

Exhibit 1.01 Amphenol Corporation Conflict Minerals Report For The Year Ended December 31, 2024 This report (this “Conflict Minerals Report”) for the year ended December 31, 2024 is presented to comply with Rule 13p-1 under the Securities Exchange Act of 1934, as amended, and Form SD (collectively, the “Rule”). The Rule was adopted by the Securities and Exchange Commission (the “SEC”) to implement

* * *

Amphenol Amphenol Corporation World Headquarters 358 Hall Avenue Wallingford, CT 06492 U.

Certificate of Amendment to the Restated Certificate of Incorporation of Amphenol Corporation

Exhibit 3.1 CERTIFICATE OF AMENDMENT TO THE RESTATED CERTIFICATE OF INCORPORATION OF AMPHENOL CORPORATION Amphenol Corporation, a corporation organized and existing under and by virtue of the General Corporation Law of the State of Delaware, does hereby certify: 1. The name of the Corporation is Amphenol Corporation (hereinafter, the “Corporation”). 2. Article FOURTH of the Corporation’s Restated

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 15, 2025 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File Nu

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 8, 2025 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File Num

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1

AMPHENOL REPORTS RECORD FIRST QUARTER 2025 RESULTS

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL REPORTS RECORD FIRST QUARTER 2025 RESULTS First Quarter 2025 Highlights: ● Record Sales of $4.8 billion, up 48% in U.S. dollars and 33% organically compared to the first quarter of 2024 ● GAAP Diluted EPS of $0.58, up 32% compared to prior year ● Record Adjusted Diluted EPS

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 23, 2025 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File

LETTER

April 10, 2025 Craig A. Lampo Senior Vice President and Chief Financial Officer Amphenol Corporation 358 Hall Avenue Wallingford, CT 06492 Re: Amphenol Corporation Form 10-K for the Fiscal Year Ended December 31, 2024 Filed February 7, 2025 File No. 001-10879 Dear Craig A. Lampo: We have limited our review of your filing to the financial statements and related disclosures and have the following co

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Defin

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule

ARS

Enabling the Electronics Revolution 2024 ANNUAL REPORTAbout Amphenol Amphenol is one of the world’s largest providers of high-technology interconnect, sensor and antenna solutions.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☒ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule

Twelfth Amendment to Pension Plan for Employees of Amphenol Corporation, as amended and restated effective January 1, 2016, dated December 19, 2024.†**

Exhibit 10.19 TWELFTH AMENDMENT (2024-2nd) TO THE PENSION PLAN FOR EMPLOYEES OF AMPHENOL CORPORATION Pursuant to Section 12.1 of the Pension Plan for Employees of Amphenol Corporation amended and restated effective January 1, 2016 (the "Plan"), the Plan is hereby amended as follows, effective January 1, 2025: 1.Exhibit B (Hourly Employees’) is amended by revising existing Section 4.1(a)(10)(xi) to

Eleventh Amendment to Pension Plan for Employees of Amphenol Corporation, as amended and restated effective January 1, 2016, dated December 19, 2024 (filed as Exhibit 10.18 to the December 31, 2024 Form 10-K).†*

Exhibit 10.18 ELEVENTH AMENDMENT (2024-FIRST) TO THE PENSION PLAN FOR EMPLOYEES OF AMPHENOL CORPORATION AS AMENDED AND RESTATED EFFECTIVE JANUARY 1, 2016 Pursuant to Section 12.1 of the Pension Plan for Employees of Amphenol Corporation as amended and restated effective January 1, 2016 (the “Plan”), the Plan is hereby amended as follows, effective January 1, 2024: 1. Section 7.5 is amended in its

Amendment to The Amphenol Corporation Employee Savings/401(K) Plan Adoption Agreement, effective January 1, 2025, dated November 21, 2024 (filed as Exhibit 10.29 to the December 31, 2024 Form 10-K).†*

Exhibit 10.29 AMENDMENT EXECUTION PAGE Plan Name:Amphenol Corporation Employee Savings/401(k) Plan (the “Plan”) Employer:Amphenol Corporation [Note: These execution pages are to be completed in the event the Employer modifies any prior election(s) or makes a new election(s) in this Adoption Agreement. Attach the amended page(s) of the Adoption Agreement to these execution pages.] The following sec

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1-1087

Amphenol Corporation Insider Trading Compliance Policy.**

Exhibit 19.1 AMPHENOL CORPORATION Insider Trading Compliance Policy Amphenol Corporation (together with its subsidiaries, the “Company”) seeks to promote a culture that encourages ethical conduct and a commitment to compliance with the law. We require our personnel to comply at all times with federal law governing insider trading. This policy sets forth procedures designed to provide reasonable as

Subsidiaries of the Company.**

Exhibit 21.1 Amphenol Corporation Listing of Subsidiaries as of December 31, 2024 State or other Jurisdiction Name of Subsidiary of Incorporation 3395 Walden Avenue Acquisition Corp. New York, U.S.A. Accumetrics, Inc. New York, U.S.A. Add-On Computer Peripherals LLC California, U.S.A. Airmar EMEA EURL France Airmar Technology Corp. New Hampshire, U.S.A. Aither Groupe France All Sensors Corporation

2025 Amphenol Corporation Management Incentive Plan (filed as Exhibit 10.24 to the December 31, 2024 Form 10-K).†*

Exhibit 10.24 2025 AMPHENOL MANAGEMENT INCENTIVE PLAN I. Purpose The purpose of the 2025 Management Incentive Plan (the “2025 Incentive Plan”) is to reward eligible key management personnel of Amphenol Corporation and affiliated operations with performance-based cash bonus payments provided certain goals are achieved. II. Eligibility Generally, participation includes senior management positions, c

AMPHENOL CORPORATION COMPLETES ACQUISITION OF OWN AND DAS BUSINESSES FROM COMMSCOPE

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL CORPORATION COMPLETES ACQUISITION OF OWN AND DAS BUSINESSES FROM COMMSCOPE Wallingford, Connecticut, February 3, 2025. Amphenol Corporation (NYSE: APH) today announced it had completed the acquisition of CommScope’s (NASDAQ: COMM) Outdoor Wireless Networks (OWN) and Distrib

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 31, 2025 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission Fil

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 22, 2025 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission Fil

AMPHENOL REPORTS RECORD FOURTH QUARTER AND FULL YEAR 2024 RESULTS

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL REPORTS RECORD FOURTH QUARTER AND FULL YEAR 2024 RESULTS Fourth Quarter 2024 Highlights: ● Sales of $4.3 billion, up 30% in U.S. dollars and 20% organically compared to the fourth quarter of 2023 ● GAAP Diluted EPS of $0.59, up 44% compared to prior year ● Adjusted Diluted

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): October 31, 2024 AMPHENOL CORPORATION (Exact name of registrant as specified in charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File Nu

Form of Global Note for the 2027 Notes

Exhibit 4.4 THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITARY OR A NOMINEE OF THE DEPOSITARY. THIS NOTE IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSFERRED EXCEPT AS A WHO

Officer’s Certificate, dated October 31, 2024, establishing the 5.000% Senior Notes due 2035 and 5.375% Senior Notes due 2054, pursuant to the Indenture (filed as Exhibit 4.3 to the Form 8-K filed on October 31, 2024).*

Exhibit 4.3 AMPHENOL CORPORATION OFFICERS’ CERTIFICATE Pursuant to Section 2.2 of the Indenture Reference is made to the Indenture (the “Indenture”), dated as of March 16, 2023, between Amphenol Corporation, a Delaware corporation (the “Company”), and U.S. Bank Trust Company, National Association, as trustee (the “Trustee”). Capitalized terms used but not otherwise defined herein shall have the re

Form of Global Note for the 2035 Notes

Exhibit 4.5 THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITARY OR A NOMINEE OF THE DEPOSITARY. THIS NOTE IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSFERRED EXCEPT AS A WHO

Form of Global Note for the 2054 Notes

Exhibit 4.6 THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITARY OR A NOMINEE OF THE DEPOSITARY. THIS NOTE IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSFERRED EXCEPT AS A WHO

Table 1: Newly Registered and Carry Forward Securities

Calculation of Filing Fee Tables S-3 AMPHENOL CORP /DE/ Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Debt 5.

Underwriting Agreement, dated October 28, 2024, by and between the Company and Barclays Capital Inc., BNP Paribas Securities Corp., BofA Securities, Inc. and HSBC Securities (USA) Inc., as representatives of the several Underwriters named in Schedule A thereto, relating to the offer and sale of $250,000,000 aggregate principal amount of the Additional 2027 Notes, $750,000,000 aggregate principal amount of the 2035 Notes and $500,000,000 aggregate principal amount of the 2054 Notes.

Exhibit 1.1 AMPHENOL CORPORATION $250,000,000 5.050% Senior Notes due 2027 $750,000,000 5.000% Senior Notes due 2035 $500,000,000 5.375% Senior Notes due 2054 UNDERWRITING AGREEMENT October 28, 2024 Underwriting Agreement October 28, 2024 BARCLAYS CAPITAL INC. BNP PARIBAS SECURITIES CORP. BOFA SECURITIES, INC. HSBC Securities (USA) Inc. As Representatives of the several Underwriters named in Sched

AMPHENOL CORPORATION ANNOUNCES PRICING OF SENIOR NOTES OFFERING

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL CORPORATION ANNOUNCES PRICING OF SENIOR NOTES OFFERING Wallingford, Connecticut, October 28, 2024. Amphenol Corporation (NYSE: APH) announced today the pricing of its offering of $250 million aggregate principal amount of senior notes due 2027 (the “Additional 2027 Notes”),

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported) October 28, 2024 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File

AMPHENOL CORPORATION $250,000,000 5.050% Senior Notes due 2027 $750,000,000 5.000% Senior Notes due 2035 $500,000,000 5.375% Senior Notes due 2054

424B5 1 tm2426831-2424b5.htm 424B5 TABLE OF CONTENTS  Filed Pursuant to Rule 424(b)(5)  Registration No. 333-270605 PROSPECTUS SUPPLEMENT (To Prospectus dated March 16, 2023) AMPHENOL CORPORATION $250,000,000 5.050% Senior Notes due 2027 $750,000,000 5.000% Senior Notes due 2035 $500,000,000 5.375% Senior Notes due 2054 We are offering $250,000,000 aggregate principal amount of our 5.050% Senior N

SUBJECT TO COMPLETION, PRELIMINARY PROSPECTUS SUPPLEMENT DATED OCTOBER 28, 2024

TABLE OF CONTENTS The information in this preliminary prospectus supplement is not complete and may be changed.

AMPHENOL CORPORATION Final Term Sheet October 28, 2024

Filed Pursuant to Rule 433 Registration Statement No. 333- 270605 October 28, 2024 AMPHENOL CORPORATION Final Term Sheet October 28, 2024 Issuer: Amphenol Corporation Expected Ratings (Moody’s / S&P)*: A3 / BBB+ (Stable / Stable) Trade Date: October 28, 2024 Settlement Date**: October 31, 2024 (T+3) 5.050% Senior Notes due 2027 5.000% Senior Notes due 2035 5.375% Senior Notes due 2054 Principal Am

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file numbe

AMPHENOL REPORTS RECORD THIRD QUARTER 2024 RESULTS

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL REPORTS RECORD THIRD QUARTER 2024 RESULTS Third Quarter 2024 Highlights: ● Record sales of $4.04 billion, up 26% in U.S. dollars and 15% organically compared to the third quarter of 2023 ● Record GAAP Diluted EPS of $0.48, up 17% compared to prior year ● Record Adjusted Dil

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 23, 2024 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission Fil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1-

AMPHENOL REPORTS RECORD SECOND QUARTER 2024 RESULTS AND ANNOUNCES DIVIDEND INCREASE

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL REPORTS RECORD SECOND QUARTER 2024 RESULTS AND ANNOUNCES DIVIDEND INCREASE Second Quarter 2024 Highlights: ● Record sales of $3.61 billion, up 18% in U.S. dollars and 11% organically compared to the second quarter of 2023 ● GAAP Diluted EPS of $0.41, up 11% compared to prio

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 24, 2024 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File N

AMPHENOL CORPORATION TO ACQUIRE MOBILE NETWORKS BUSINESSES FROM COMMSCOPE

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL CORPORATION TO ACQUIRE MOBILE NETWORKS BUSINESSES FROM COMMSCOPE Transaction highlights: · To acquire CommScope’s Outdoor Wireless Networks and Distributed Antenna Systems businesses for $2.1 billion in cash · Adds advanced antenna and associated interconnect products, tech

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 18, 2024 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File N

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 11, 2024 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File N

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Amphenol Corporation (Exact Name of Registrant as Specified in Charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Amphenol Corporation (Exact Name of Registrant as Specified in Charter) Delaware 1-10879 (State of Incorporation) (Commission File Number) 358 Hall Avenue, Wallingford, Connecticut 06492 (Address of Principal Executive Offices) (Zip Code) Lance E. D’Amico 203 265-8900 (Name and telephone n

Exhibit 1.01 - Conflict Minerals Report as required by Items 1.01 and 1.02 of this Form SD.

Exhibit 1.01 Amphenol Corporation Conflict Minerals Report For The Year Ended December 31, 2023 This report (this “Conflict Minerals Report”) for the year ended December 31, 2023 is presented to comply with Rule 13p-1 under the Securities Exchange Act of 1934, as amended, and Form SD (collectively, the “Rule”). The Rule was adopted by the Securities and Exchange Commission (the “SEC”) to implement

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 21, 2024 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File Nu

AMPHENOL CORPORATION COMPLETES ACQUISITION OF CIT BUSINESS FROM CARLISLE

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL CORPORATION COMPLETES ACQUISITION OF CIT BUSINESS FROM CARLISLE Wallingford, Connecticut, May 21, 2024. Amphenol Corporation (NYSE: APH) today announced it had completed the acquisition of the Carlisle Interconnect Technologies (CIT) business from Carlisle Companies Incorpo

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 20, 2024 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File Nu

AMPHENOL CORPORATION ANNOUNCES TWO-FOR-ONE STOCK SPLIT

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL CORPORATION ANNOUNCES TWO-FOR-ONE STOCK SPLIT Wallingford, Connecticut, May 20, 2024. Amphenol Corporation (NYSE: APH) today announced that its Board of Directors approved a two-for-one stock split to be paid in the form of a stock dividend. Each Amphenol shareholder of rec

As filed with the Securities and Exchange Commission on May 17, 2024.

As filed with the Securities and Exchange Commission on May 17, 2024. Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Amphenol Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 22-2785165 (I.R.S. Empl

Filing Fee Table

Exhibit 107 Calculation of Filing Fee Table Form S-8 (Form Type) Amphenol Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered(1)(2) Proposed Maximum Offering Price Per Share(3) Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Equity Class A Common Stock, par value $0.

Certificate of Amendment to the Restated Certificate of Incorporation of Amphenol Corporation, dated May 16, 2024 (filed as Exhibit 3.1 to the Form 8-K filed on May 16, 2024).*

Exhibit 3.1 CERTIFICATE OF AMENDMENT TO THE RESTATED CERTIFICATE OF INCORPORATION OF AMPHENOL CORPORATION Amphenol Corporation, a corporation organized and existing under and by virtue of the General Corporation Law of the State of Delaware, does hereby certify: 1. The name of the Corporation is Amphenol Corporation (hereinafter, the “Corporation”). 2. Article SEVENTH of the Corporation’s Restated

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 16, 2024 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File Nu

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1

Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 24, 2024 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File

AMPHENOL REPORTS FIRST QUARTER 2024 RESULTS AND ANNOUNCES NEW STOCK REPURCHASE PROGRAM

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL REPORTS FIRST QUARTER 2024 RESULTS AND ANNOUNCES NEW STOCK REPURCHASE PROGRAM First Quarter 2024 Highlights: ● Sales of $3.26 billion, up 9% in U.S. dollars and 6% organically compared to the first quarter of 2023 ● GAAP Diluted EPS of $0.87, up 23% compared to prior year ●

ARS

Enabling the Electronics Revolution 2023 ANNUAL REPORTAbout Amphenol Amphenol is one of the world’s largest providers of high-technology interconnect, sensor and antenna solutions.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule

Form of Global Note for the 2029 Notes

Exhibit 4.4 THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITARY OR A NOMINEE OF THE DEPOSITARY. THIS NOTE IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSFERRED EXCEPT AS A WHO

Form of Global Note for the 2027 Notes

Exhibit 4.3 THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITARY OR A NOMINEE OF THE DEPOSITARY. THIS NOTE IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSFERRED EXCEPT AS A WHO

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) April 5, 2024 AMPHENOL CORPORATION (Exact name of registrant as specified in charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File Number

Officer’s Certificate, dated April 5, 2024, establishing the 5.050% Senior Notes due 2027, 5.050% Senior Notes due 2029, and 5.250% Senior Notes due 2034, pursuant to the Indenture (filed as Exhibit 4.2 to the Form 8-K filed on April 5, 2024).*

Exhibit 4.2 AMPHENOL CORPORATION OFFICERS’ CERTIFICATE Pursuant to Section 2.2 of the Indenture Reference is made to the Indenture (the “Indenture”), dated as of March 16, 2023, between Amphenol Corporation, a Delaware corporation (the “Company”), and U.S. Bank Trust Company, National Association, as trustee (the “Trustee”). Capitalized terms used but not otherwise defined herein shall have the re

Form of Global Note for the 2034 Notes

Exhibit 4.5 THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITARY OR A NOMINEE OF THE DEPOSITARY. THIS NOTE IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSFERRED EXCEPT AS A WHO

AMPHENOL CORPORATION $450,000,000 5.050% Senior Notes due 2027 $450,000,000 5.050% Senior Notes due 2029 $600,000,000 5.250% Senior Notes due 2034

TABLE OF CONTENTS  Filed Pursuant to Rule 424(b)(5)  Registration No. 333-270605 PROSPECTUS SUPPLEMENT (To Prospectus dated March 16, 2023) AMPHENOL CORPORATION $450,000,000 5.050% Senior Notes due 2027 $450,000,000 5.050% Senior Notes due 2029 $600,000,000 5.250% Senior Notes due 2034 We are offering $450,000,000 aggregate principal amount of our 5.050% Senior Notes due 2027 (the “2027 notes”), $

Calculation of Filing Fee Table (Form Type) Amphenol Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

Exhibit 107 Calculation of Filing Fee Table 424(b)(5) (Form Type) Amphenol Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Fees to be Paid Debt 5.

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported) April 2, 2024 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File Nu

AMPHENOL CORPORATION ANNOUNCES PRICING OF SENIOR NOTES OFFERING

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL CORPORATION ANNOUNCES PRICING OF SENIOR NOTES OFFERING Wallingford, Connecticut, April 2, 2024. Amphenol Corporation (NYSE: APH) announced today the pricing of its offering of $450 million aggregate principal amount of senior notes due 2027 (the “2027 Notes”), $450 million

Underwriting Agreement, dated April 2, 2024, by and between the Company and BofA Securities, Inc., Citigroup Global Markets Inc., J.P. Morgan Securities LLC and TD Securities (USA) LLC, as representatives of the several Underwriters named in Schedule A thereto, relating to the offer and sale of $450,000,000 aggregate principal amount of the 2027 Notes, $450,000,000 aggregate principal amount of the 2029 Notes and $600,000,000 aggregate principal amount of the 2034 Notes.

Exhibit 1.1 AMPHENOL CORPORATION    $450,000,000 5.050% Senior Notes due 2027 $450,000,000 5.050% Senior Notes due 2029 $600,000,000 5.250% Senior Notes due 2034 UNDERWRITING AGREEMENT April 2, 2024    Underwriting Agreement    April 2, 2024    BOFA SECURITIES, INC. CITIGROUP GLOBAL MARKETS INC. J.P. MORGAN SECURITIES LLC TD Securities (USA) LLC As Representatives of the several Underwriters named

SUBJECT TO COMPLETION, PRELIMINARY PROSPECTUS SUPPLEMENT DATED APRIL 2, 2024

TABLE OF CONTENTS The information in this preliminary prospectus supplement is not complete and may be changed.

AMPHENOL CORPORATION Final Term Sheet April 2, 2024

Filed Pursuant to Rule 433 Registration Statement No. 333- 270605 April 2, 2024 AMPHENOL CORPORATION Final Term Sheet April 2, 2024 Issuer: Amphenol Corporation Expected Ratings (Moody’s / S&P)*: A3 / BBB+ (Stable / Stable) Trade Date: April 2, 2024 Settlement Date**: April 5, 2024 (T+3) 5.050% Senior Notes due 2027 5.050% Senior Notes due 2029 5.250% Senior Notes due 2034 Principal Amount: $450,0

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☒ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule

Third Amended and Restated Credit Agreement, dated March 21, 2024, among the Company, certain subsidiaries of the Company, a syndicate of financial institutions and JPMorgan Chase Bank, N.A., acting as the administrative agent (filed as Exhibit 10.1 to the Form 8-K filed on March 22, 2024).*

Exhibit 10.1 EXECUTION VERSION THIRD AMENDED AND RESTATED CREDIT AGREEMENT dated as of March 21, 2024 among AMPHENOL CORPORATION, as Parent Borrower and a Guarantor AMPHENOL EAST ASIA LIMITED 安費諾（東亞）有限公司, as Hong Kong Borrower and AMPHENOL TECHNOLOGIES HOLDING GMBH, as German Borrower and AMPHENOL BENELUX B.V., as Dutch Borrower and AMPHENOL LIMITED, as UK Borrower and THE OTHER SUBSIDIARIES PARTY

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 21, 2024 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File

APH / Amphenol Corporation / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv0282-amphenolcorporationcl.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 15)* Name of issuer: Amphenol Corporation Class A Title of Class of Securities: Common Stock CUSIP Number: 032095101 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate

APH / Amphenol Corporation / FMR LLC Passive Investment

SC 13G/A 1 filing.txt SCHEDULE 13G Amendment No.24 AMPHENOL CORPORATION NEW CLASS A COMMON STOCK Cusip #032095101 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: [x] Rule 13d-1(b) [ ] Rule 13d-1(c) [ ] Rule 13d-1(d) Cusip #032095101 Item 1: Reporting Person - FMR LLC Item 2: (a) [ ] (b) [ ] Item 4: Delaware Item 5: 53,299,613 Item 6: 0 Item 7: 55,887,537 I

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1-1087

Subsidiaries of the Company.**

Exhibit 21.1 Amphenol Corporation Listing of Subsidiaries as of December 31, 2023 State or other Jurisdiction Name of Subsidiary of Incorporation 3395 Walden Avenue Acquisition Corp. New York, U.S.A. Accumetrics, Inc. New York, U.S.A. Add-On Computer Peripherals LLC California, U.S.A. Airmar EMEA EURL France Airmar Technology Corporation New Hampshire, U.S.A. Aither Groupe France All Sensors Corpo

Description of the Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 (filed as Exhibit 4.11 to the December 31, 2023 Form 10-K).*

Exhibit 4.11 Description of the Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 The following description of the capital stock of Amphenol Corporation (the “Company,” “us” or “we”) is a summary and does not purport to be complete. It is subject to and qualified in its entirety by reference to the Company’s Restated Certificate of Incorporation (the

Amendment to The Amphenol Corporation Employee Savings/401(K) Plan Adoption Agreement, effective January 1, 2024, dated November 30, 2023 (filed as Exhibit 10.28 to the December 31, 2023 Form 10-K).†*

Exhibit 10.28 ADOPTION AGREEMENT ARTICLE 1 PROFIT SHARING/401(K) PLAN 1.01 PLAN INFORMATION (a) Name of Plan: This is the Amphenol Corporation Employee Savings/401(k) Plan (the “Plan”) Pre-Approved Defined Contribution Plan – 06/30/2020 PS Plan 85085-1701083461AA 2020 FMR LLC All rights reserved. 1 AMENDMENT EXECUTION PAGE Plan Name:Amphenol Corporation Employee Savings/401(k) Plan (the “Plan”) Em

2024 Amphenol Corporation Management Incentive Plan (filed as Exhibit 10.24 to the December 31, 2023 Form 10-K).†*

Exhibit 10.24 2024 AMPHENOL MANAGEMENT INCENTIVE PLAN I. Purpose The purpose of the 2024 Management Incentive Plan (the “2024 Incentive Plan”) is to reward eligible key management personnel of Amphenol Corporation and affiliated operations with performance-based cash bonus payments provided certain goals are achieved. II. Eligibility Generally, participation includes senior management positions, c

Amphenol Corporation Policy for Recovery of Erroneously Awarded Compensation.**

Exhibit 97.1 AMPHENOL CORPORATION POLICY FOR RECOVERY OF ERRONEOUSLY AWARDED COMPENSATION Amphenol Corporation (the “Company”) has adopted this Policy for Recovery of Erroneously Awarded Compensation (the “Policy”), effective as of October 2, 2023 (the “Effective Date”). Capitalized terms used in this Policy but not otherwise defined herein are defined in Section 11. 1. Persons Subject to Policy T

AMPHENOL CORPORATION TO ACQUIRE CIT BUSINESS FROM CARLISLE

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL CORPORATION TO ACQUIRE CIT BUSINESS FROM CARLISLE Transaction highlights: · To acquire Carlisle Interconnect Technologies for $2.0 billion in cash · Adds leading capabilities in harsh environment interconnect solutions · Broad product portfolio highly complementary to Amphe

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 30, 2024 AMPHENOL CORPORA

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 30, 2024 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission Fil

APH / Amphenol Corporation / BlackRock Inc. Passive Investment

SC 13G/A 1 us0320951017012524.txt us0320951017012524.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No: 11) AMPHENOL CORPORATION - (Name of Issuer) Class A Common Stock - (Title of Class of Securities) 032095101 - (CUSIP Number) December 31, 2023 - (Date of Event Which Requires Filing of this Statement) Check the appr

AMPHENOL REPORTS FOURTH QUARTER AND FULL YEAR 2023 RESULTS

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL REPORTS FOURTH QUARTER AND FULL YEAR 2023 RESULTS Fourth Quarter 2023 Highlights: ● Record Sales of $3.33 billion, up 3% in U.S. dollars and down 1% organically compared to the fourth quarter of 2022 ● GAAP Diluted EPS of $0.83, up 1% compared to prior year ● Record Adjuste

Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 24, 2024 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission Fil

Tenth Amendment to Pension Plan for Employees of Amphenol Corporation as amended and restated effective January 1, 2016, dated August 28, 2023 (filed as Exhibit 10.17 to the September 30, 2023 Form 10-Q).†*

Exhibit 10.17 TENTH AMENDMENT (2023-FIRST) TO THE PENSION PLAN FOR EMPLOYEES OF AMPHENOL CORPORATION AS AMENDED AND RESTATED EFFECTIVE JANUARY 1, 2016 Pursuant to Section 12.1 of the Pension Plan for Employees of Amphenol Corporation as amended and restated effective January 1, 2016 (the “Plan”), the Plan is hereby amended as follows, effective September 1, 2023: 1. Section 7.1(b) is amended in it

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file numbe

Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 25, 2023 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission Fil

AMPHENOL REPORTS THIRD QUARTER 2023 RESULTS AND ANNOUNCES DIVIDEND INCREASE

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL REPORTS THIRD QUARTER 2023 RESULTS AND ANNOUNCES DIVIDEND INCREASE Third Quarter 2023 Highlights: ● Sales of $3.199 billion, down 3% in U.S. dollars and 5% organically compared to the third quarter of 2022 ● GAAP Diluted EPS of $0.83, up 4% compared to prior year ● Adjusted

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 6, 2023 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 3, 2023 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File

Amphenol Corporation, Fifth Amended and Restated By-laws dated August 3, 2023 (filed as Exhibit 3.1 to the Form 8-K filed on August 4, 2023).*

Exhibit 3.1 AMPHENOL CORPORATION FIFTH AMENDED AND RESTATED BY-LAWS (as of August 3, 2023) Article I MEETINGS OF STOCKHOLDERS Section 1.                Place of Meeting and Notice. Meetings of the stockholders of the Corporation shall be held at such place either within or without the State of Delaware as the Board of Directors may determine. Section 2.                 Section 2.1.         Annual

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 3, 2023 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File

Amphenol Corporation Form of Director Phantom Stock Award Agreement (filed as Exhibit 10.22 to the June 30, 2023 Form 10-Q).†*

Exhibit 10.22 AMPHENOL CORPORATION NOTICE OF CASH AWARD You have been granted the following Cash Award (the “Cash Award”), which Cash Award has a value equal to the value of a number of shares (“Related Shares”) of common stock (the “Common Stock”) of AMPHENOL CORPORATION (“Amphenol”) as set forth in this Notice of Cash Award: Date of Grant: Name of Recipient: Total Number of Related Shares: Vesti

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1-

AMPHENOL REPORTS SECOND QUARTER 2023 RESULTS

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL REPORTS SECOND QUARTER 2023 RESULTS Second Quarter 2023 Highlights: ● Sales of $3.054 billion, down 3% in U.S. dollars and 4% organically compared to the second quarter of 2022 ● GAAP Diluted EPS of $0.74, down 3% compared to prior year ● Adjusted Diluted EPS of $0.72, down

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 26, 2023 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File N

Exhibit 1.01 - Conflict Minerals Report as required by Items 1.01 and 1.02 of this Form.

U.S. Securities and Exchange Commission You’ve Exceeded the SEC’s Traffic Limit Your request rate has exceeded the SEC’s maximum allowable requests per second. Your access to SEC.gov will be limited for 10 minutes. Current guidelines limit each user to a total of no more than 10 requests per second, regardless of the number of machines used to submit requests. To ensure that SEC.gov remains

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Amphenol Corporation (Exact Name of Registrant as Specified in Charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Amphenol Corporation (Exact Name of Registrant as Specified in Charter) Delaware 1-10879 22-2785165 (State of Incorporation) (Commission File Number) (IRS Employer Identification No.) 358 Hall Avenue, Wallingford, Connecticut 06492 (Address of Principal Executive Offices) (Zip Code) Lance

Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 18, 2023 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File Nu

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1

AMPHENOL REPORTS FIRST QUARTER 2023 RESULTS

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL REPORTS FIRST QUARTER 2023 RESULTS First Quarter 2023 Highlights: ● Sales of $2.974 billion, up 1% in U.S. dollars and organically compared to the first quarter of 2022 ● GAAP Diluted EPS of $0.71, up 4% compared to prior year ● Adjusted Diluted EPS of $0.69, up 3% compared

Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 26, 2023 AMPHENOL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-10879 22-2785165 (State or other jurisdiction of incorporation) (Commission File

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defi

ARS

2022 ANNUAL REPORT Enabling the Electronics RevolutionAbout Amphenol Amphenol is one of the world’s largest providers of high-technology interconnect, sensor and antenna solutions.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) March 30, 2023 AMPHENOL CORPORATIO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) March 30, 2023 AMPHENOL CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 1-10879 22-2785165 (State or Other Jurisdiction of Incorporation) (Commission File Numbe

Form of Global Note

Exhibit 4.3 THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITARY OR A NOMINEE OF THE DEPOSITARY. THIS NOTE IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSFERRED EXCEPT AS A WHO

Officer’s Certificate, dated March 30, 2023, establishing the 4.750% Senior Notes due 2026 pursuant to the Indenture (filed as Exhibit 4.2 to the Form 8-K filed on March 30, 2023).*

Exhibit 4.2 AMPHENOL CORPORATION OFFICERS’ CERTIFICATE Pursuant to Section 2.2 of the Indenture Reference is made to the Indenture (the “Indenture”), dated as of March 16, 2023, between Amphenol Corporation, a Delaware corporation (the “Company”), and U.S. Bank Trust Company, National Association, as trustee (the “Trustee”). Capitalized terms used but not otherwise defined herein shall have the re

$350,000,000 AMPHENOL CORPORATION 4.750% Senior Notes due 2026

TABLE OF CONTENTS  Filed Pursuant to Rule 424(b)(5)  Registration No. 333-270605 PROSPECTUS SUPPLEMENT (To Prospectus dated March 16, 2023) $350,000,000 AMPHENOL CORPORATION 4.750% Senior Notes due 2026 We are offering $350,000,000 aggregate principal amount of our 4.750% Senior Notes due 2026 (the “notes”). We will pay interest on the notes semi-annually on March 30 and September 30 of each year,

Underwriting Agreement, dated March 27, 2023, by and between the Company and BNP Paribas Securities Corp., BofA Securities, Inc. and J.P. Morgan Securities LLC, as representatives of the several Underwriters named in Schedule A thereto, relating to the offer and sale of $350,000,000 aggregate principal amount of the Notes.

Exhibit 1.1 AMPHENOL CORPORATION $350,000,000 4.750% Senior Notes due 2026 UNDERWRITING AGREEMENT March 27, 2023 Underwriting Agreement March 27, 2023 BNP PARIBAS SECURITIES CORP. BOFA SECURITIES, INC. J.P. MORGAN SECURITIES LLC As Representatives of the several Underwriters named in Schedule A hereto c/o BNP Paribas Securities Corp. 787 Seventh Avenue, 3rd Floor New York, New York 10019 c/o BofA

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) March 27, 2023 AMPHENOL CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 1-10879 22-2785165 (State or Other Jurisdiction of Incorporation) (Commission File Numbe

AMPHENOL CORPORATION ANNOUNCES PRICING OF $350,000,000 OF SENIOR NOTES

Exhibit 99.1 Amphenol News Release World Headquarters 358 Hall Avenue Wallingford, CT 06492 Telephone (203) 265-8900 AMPHENOL CORPORATION ANNOUNCES PRICING OF $350,000,000 OF SENIOR NOTES Wallingford, Connecticut, March 28, 2023. Amphenol Corporation (NYSE: APH) announced today the pricing of its offering of $350,000,000 aggregate principal amount of senior notes due 2026 (the “Notes”). The Notes

You’ve Exceeded the SEC’s Traffic Limit

Exhibit 107 Calculation of Filing Fee Table 424(b)(5) (Form Type) Amphenol Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Fees to be Paid Debt 4.

AMPHENOL CORPORATION Final Term Sheet March 27, 2023

Filed Pursuant to Rule 433 Registration Statement No. 333- 270605 March 27, 2023 AMPHENOL CORPORATION Final Term Sheet March 27, 2023 Issuer: Amphenol Corporation Expected Ratings (Moody’s / S&P)*: A3 / BBB+ (Stable / Stable) Trade Date: March 27, 2023 Settlement Date**: March 30, 2023 (T+3) Principal Amount: $350,000,000 Maturity Date: March 30, 2026 Coupon (Interest Rate): 4.750% Price to Public

SUBJECT TO COMPLETION, PRELIMINARY PROSPECTUS SUPPLEMENT DATED MARCH 27, 2023

TABLE OF CONTENTS The information in this preliminary prospectus supplement is not complete and may be changed.

Form T-1, Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of U.S. Bank Trust Company, National Association, as Trustee under the Indenture for the Senior Debt Securities*

Exhibit 25.1 securities and exchange commission Washington, D.C. 20549 FORM T-1 Statement of Eligibility Under The Trust Indenture Act of 1939 of a Corporation Designated to Act as Trustee Check if an Application to Determine Eligibility of a Trustee Pursuant to Section 305(b)(2) ¨ U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (Exact name of Trustee as specified in its charter) 91-1821036 I.R.S. E

Filing Fee table*

Exhibit 107 Calculation of Filing Fee Tables Form S-3 (Form Type) Amphenol Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Ca

Indenture, dated as of March 16, 2023, between Amphenol Corporation and U.S. Bank Trust Company, National Association, as trustee (filed as Exhibit 4.1 to the Company’s Registration Statement on Form S-3 filed on March 16, 2023).*

Exhibit 4.1 INDENTURE, dated as of March 16, 2023, between AMPHENOL CORPORATION and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee CONTENTS Page Article I DEFINITIONS AND INCORPORATION BY REFERENCE 5 Section 1.1 Definitions 5 Section 1.2 Incorporation by Reference of Trust Indenture Act 10 Section 1.3 Rules of Construction 11 Article II THE SECURITIES 11 Section 2.1 Issuable in Series 1

As filed with the Securities and Exchange Commission on March 16, 2023

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on March 16, 2023 Registration No.

APH / Amphenol Corporation / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv0256-amphenolcorpclassa.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 14)* Name of issuer: Amphenol Corp. Class A Title of Class of Securities: Common Stock CUSIP Number: 032095101 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box to de

APH / Amphenol Corporation / FMR LLC Passive Investment

SC 13G/A 1 filing.txt SCHEDULE 13G Amendment No.23 AMPHENOL CORPORATION NEW CLASS A COMMON STOCK Cusip #032095101 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: [x] Rule 13d-1(b) [ ] Rule 13d-1(c) [ ] Rule 13d-1(d) Cusip #032095101 Item 1: Reporting Person - FMR LLC Item 2: (a) [ ] (b) [ ] Item 4: Delaware Item 5: 51,690,601 Item 6: 0 Item 7: 53,735,004 I

2023 Amphenol Corporation Management Incentive Plan (filed as Exhibit 10.22 to the December 31, 2022 Form 10-K).†*

Exhibit 10.22 2023 AMPHENOL MANAGEMENT INCENTIVE PLAN I. Purpose The purpose of the 2023 Management Incentive Plan (the “2023 Incentive Plan”) is to reward eligible key management personnel of Amphenol Corporation and affiliated operations with performance-based cash bonus payments provided certain goals are achieved. II. Eligibility Generally, participation includes senior management positions, c

Subsidiaries of the Company.**

Exhibit 21.1 Amphenol Corporation Listing of Subsidiaries as of December 31, 2022 State or other Jurisdiction Name of Subsidiary of Incorporation 3395 Walden Avenue Acquisition Corp. New York, U.S.A. Accumetrics, Inc. New York, U.S.A. Add-On Computer Peripherals LLC California, U.S.A. All Sensors Corporation California, U.S.A. All Systems Broadband, Inc. California, U.S.A. Alturna Connect N.V. Net

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31, 2022 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1-1087

Description of the Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 (filed as Exhibit 4.9 to the December 31, 2022 Form 10-K).*

Exhibit 4.9 Description of the Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 The following description of the capital stock of Amphenol Corporation (the “Company,” “us” or “we”) is a summary and does not purport to be complete. It is subject to and qualified in its entirety by reference to the Company’s Restated Certificate of Incorporation (the “

Amendment to The Amphenol Corporation Employee Savings/401(K) Plan Adoption Agreement, effective January 1, 2023, dated December 19, 2022 (filed as Exhibit 10.25 to the December 31, 2022 Form 10-K).†*

Exhibit 10.25 ADOPTION AGREEMENT ARTICLE 1 PROFIT SHARING/401(K) PLAN 1.01 PLAN INFORMATION (g) Plan Status: (4)þPlan Merger Effective Dates. Certain plan(s) were merged into the Plan on or after the date specified in Subsection 1.01(g)(1) above. Please complete the appropriate subsection(s) of the Plan Mergers Addendum. Pre-Approved Defined Contribution Plan – 06/30/2020 PS Plan 85085-1671095574A