Amendment to The Amphenol Corporation Employee Savings/401(K) Plan Adoption Agreement, effective January 1, 2024, dated November 30, 2023

Exhibit 10.28

ADOPTION AGREEMENT

ARTICLE 1

PROFIT SHARING/401(K) PLAN

This is the Amphenol Corporation Employee Savings/401(k) Plan (the “Plan”)

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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 section(s) of the Plan are hereby amended effective as of the date(s) set forth below:

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IN WITNESS WHEREOF, the Employer has caused this Amendment to be executed on the date given below.

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Note: Only one authorized signature is required to execute this Adoption Agreement unless the Employer's corporate policy mandates two authorized signatures.

Note: This page may be duplicated, if needed, to allow separate execution when the Employer indicated in Section 1.02(a) is changing.

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PLAN MERGERS ADDENDUM

for

Plan Name: Amphenol Corporation Employee Savings/401(k) Plan

Effective Date: 01/01/2023

Effective Date: 01/01/2023

Effective Date: 01/01/2024

Note: If a 411(d)(6) protected benefit in a plan being merged into the Plan is not permitted in a pre-approved plan, as described in Section 6.03 of Revenue Procedure 2017-41, such provision must be discontinued no later than the merger date and shall apply only to the extent required under Code Section 411(d)(6).

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PARTICIPATING EMPLOYERS ADDENDUM

for

Plan Name: Amphenol Corporation Employee Savings/401(k) Plan

Note: All participating employers must be a business entity of a type recognized under Treasury Regulation Section ###-###-####-2(a).

(a)        þ        Only the following Related Employers (as defined in Subsection 2.01(uu) of the Basic Plan Document) participate in the Plan (list each participating Related Employer and its Employer Tax Identification Number):

Amphenol (Maryland), Inc., 52-1176780

Amphenol Adronics, Inc., 99-0361205

Amphenol Alden Products Company, 20 ###-###-####

Amphenol Antenna Solutions, Inc., 36 ###-###-####

Amphenol Cables on Demand Corp., 20 ###-###-####

Amphenol Custom Cable, 59 ###-###-####

Amphenol EEC, Inc., 32-0040123

Amphenol Interconnect Products Corporation, 06-1237121

Amphenol Nelson-Dunn Technologies Inc., 95 ###-###-####

Amphenol Network Solutions, Inc., 91-1182148

Amphenol Optimize Manufacturing Co., 86-0503978

Amphenol PCD, Inc., 04 ###-###-####

Amphenol Printed Circuits, 02-0502908

Amphenol T&M Antennas, 06-1574456

Amphenol Tecvox LLC, 46 ###-###-####

Ardent Concepts, 20-0050339

Charles Industry, LLC, 36 ###-###-####, 01/01/2023

FCI USA LLC, 27-1370902

Onanon, Inc., 77-0023432, 01/01/2023

Piezotech, LLC, 35 ###-###-####

SV Microwave, Inc., 65-0368031

Sine Systems Corporation, 06-1274360

Times Fiber Communications, Inc., 06-0955048

Times Microwave Systems, Inc., 01-0816035

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(b)        ◻        All Related Employer(s) as defined in Subsection 2.01(uu) of the Basic Plan Document participate in the Plan as soon as administratively feasible.

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(c)        ◻        All Related Employer(s) as defined in Subsection 2.01(uu) of the Basic Plan Document participate in the Plan at the time described in Subsection 2.01(u) of the Basic Plan Document.

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(1)      þ    If the common control relationship (as defined in Code Section 414(c)) of any participating employer changes in such a way that such participating employer is no longer a Related Employer, then such employer shall continue to be a participating employer and the Plan shall be a multiple employer plan as provided in Section 18.05 of the Basic Plan Document.

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