Amendment to The Amphenol Corporation Employee Savings/401(K) Plan Adoption Agreement, effective January 1, 2023, dated December 19, 2022

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Exhibit 10.25

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ADOPTION AGREEMENT

ARTICLE 1

PROFIT SHARING/401(K) PLAN

(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.

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AMENDMENT EXECUTION PAGE

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

Employer:Amphenol Corporation

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[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.]

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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

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

Effective Date:  01/01/2023

Effective Date:  01/01/2023

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

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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)þOnly 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 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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COMPENSATION ADDENDUM

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

(14)þAmounts paid to, or on behalf of, the Employee to reduce or offset student loan repayment obligations.

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MATCHING EMPLOYER CONTRIBUTIONS ADDENDUM

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

(1)þFlat Percentage Match

All participants except employees covered by a collective bargaining agreement (International Association of Machinists and Aerospace Workers, Sidney Lodge No. 1529 (Amphenol Sidney Union); International Brotherhood of Electrical Workers, Local 2015 (Amphenol RF union); The United Steelworkers, Local Union #9428 (TFC Union)..

Limit on Non-Discretionary Matching Employer Contributions for the group of “eligible” Participants described above, if any:

(i)þContributions in excess of 8% of the "eligible" Participant's Compensation for the Contribution Period shall not be considered for non-discretionary Matching Employer Contributions.

(ii)¨Matching Employer Contributions for each "eligible" Participant for each Plan Year shall be limited to $_____.

Effective 1/1/2023, a union employee at International Association of Machinists and Aerospace Workers, Sidney Lodge No. 1529 (Amphenol Sidney Union).

Limit on Non-Discretionary Matching Employer Contributions for the group of “eligible” Participants described above, if any:

(i)þContributions in excess of 4% of the "eligible" Participant's Compensation for the Contribution Period shall not be considered for non-discretionary Matching Employer Contributions.

(ii)¨Matching Employer Contributions for each "eligible" Participant for each Plan Year shall be limited to $_____.

Effective 1/1/2023, a union employee at The United Steelworkers, Local Union #9428 (TFC Union).

Limit on Non-Discretionary Matching Employer Contributions for the group of “eligible” Participants described above, if any:

(i)þContributions in excess of 4% of the "eligible" Participant's Compensation for the Contribution Period shall not be considered for non-discretionary Matching Employer Contributions.

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NONELECTIVE EMPLOYER CONTRIBUTIONS ADDENDUM

for

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

(1)þFixed Percentage Employer Contribution - For each Contribution Period, the Employer shall contribute for each "eligible" Participant (except as otherwise provided in (A)(i) below) a percentage of such "eligible" Participant's Compensation equal to:

(A)0% (not to exceed 25%) to all “eligible” Participants, except as provided in (i) below.

Note:  The eligible group(s) defined below must be clearly defined in a manner that will not violate the definite predetermined allocation formula requirement of Treasury Regulation Section 1.401-1(b)(1)(ii) and cannot be subject to the discretion of the Employer. In addition, the design of the classifications cannot be such that the only Non-Highly Compensated Employees benefiting under the Plan are those with the lowest compensation and/or the shortest periods of service and who may represent the minimum number of such employees necessary to satisfy coverage under Code Section 410(b).

(i)þDifferent percentages for different groups of "eligible" Participants as follows:

1). Effective 1/1/2016, a union employee at International Brotherhood of Electrical Workers, Local 2015 (Amphenol RF union) hired or rehired on or after 1/1/2016.

1). Effective 1/1/2020, a union employee at International Association of Machinists and Aerospace Workers, Sidney Lodge No. 1529 (Amphenol Sidney Union), hired or rehired on or after January 1, 2014. 2). Effective 1/1/2023, a union employee at The United Steelworkers, Local Union #9428 (TFC Union) hired or rehired on or after 9/1/2013.

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PROTECTED BENEFIT PROVISIONS ADDENDUM

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

Protected Benefit Provisions - The following benefits are retained under the Plan due to the nature of each as a "protected benefit" under Code Section 411(d)(6) and apply for the Participants and Beneficiaries described:

Effective 04/22/2016, Participants who had been previously recognized by the Plan as having had assets transferred to the Plan in conjunction with a Plan merger and having a separate vesting schedule (or schedules) due to such merger or having a vesting schedule in the Plan different from the vesting schedule(s) selected in Section 1.16, will now be 100% vested in all Matching Employer Contributions and Nonelective Employer Contributions in the Plan. The Tecvox OEM Solutions, LLC 401(k) Profit Sharing Plan Nonelective Employer Contributions that merged into the plan will be eligible for the Active Military Distribution (Heart Act)
The Early Retirement Age for the Participants who merged into the Plan from the Amphenol Affiliated Companies Employee Savings 401(k) Plan effective 03/01/2021, is the date the Participant attains age 55 and completes 7 years of Vesting Service.
The Early Retirement Age for the Participants who merged into the Plan from Telect Employee Retirement Plan on 11/29/2021, is the date the Participant attains age 55.
The Early Retirement Age for the Participants who merged into the Plan from Charles Industries, Ltd. 401(k) Savings Plan on 01/01/2023, is the date the Participant attains age 62.

Note:  If a 411(d)(6) protected benefit in the Plan or a plan being merged into the Plan is not either (i) available as a provision through the Pre-Approved Plan or (ii) the subject of a prior determination, advisory, or opinion letter, the Employer cannot rely on the Pre-Approved Plan Provider’s opinion letter for qualification with respect to such benefit.  If a 411(d)(6) protected benefit in the Plan or 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 date the Plan adopts the Pre-Approved Plan or, in the case of a merger, the merger date and shall apply only to the extent required under Code Section 411(d)(6).

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ADDITIONAL PROVISIONS ADDENDUM

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

(a)Additional Provision(s) – The following provisions supplement and/or, to the degree described herein, supersede other provisions of this Adoption Agreement and the Basic Plan Document in the following manner:

Participants who merged into this Plan from the Charles Industries, LTD. 401(k) Savings Plan, effective 01/01/2023, also have the following definition of disability: Determined by the Administrator on the basis of medical evidence satisfactory to it: "unable to perform usually and customary duties for Employer.".