Amendment to The Amphenol Corporation Employee Savings/401(K) Plan Adoption Agreement, effective January 1, 2025, dated November 21, 2024

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Exhibit 10.29

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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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PARTICIPATING EMPLOYERS ADDENDUM

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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).

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(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 Cable and Interconnect Technologies, Inc., 59 ###-###-####

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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MATCHING EMPLOYER CONTRIBUTIONS ADDENDUM

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for

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:

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

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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)þ  Contributions 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 $    .

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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)þ  Contributions 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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(ii)¨Matching Employer Contributions for each “eligible” Participant for each Plan Year shall be limited to $     .

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Effective 1/1/2025, a union employee at International Brotherhood of Electrical Workers, Local  2015 (Amphenol RF union) hired or rehired on or after January 1, 2016.

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

(i)þ  Contributions in excess of 6% 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 $     .

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      % of the next        % of the “eligible” Participant’s Compensation contributed to the Plan,

       % of the next       % of the “eligible” Participant’s Compensation contributed to the Plan shall be allocated only to the “eligible” Participants described below:

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

(i)¨Matching Employer Contributions for each “eligible” Participant for each Plan Year shall be limited to $      .

Note: The group of “eligible” Participants identified above 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).

Note: The group of “eligible” Participants benefiting under each match rate must satisfy the nondiscriminatory coverage requirements of Code Section 410(b) and the group to whom the match rate is effectively available must not substantially favor HCEs.

(3)¨       Employees covered by the following collective bargaining agreement(s) shall only receive Employer Matching Contributions to the extent so indicated within each such agreement:

(4)¨       Employees covered by the following collective bargaining agreement(s) shall receive Employer Matching Contributions indicated within each such agreement in addition to any other Employer Matching Contributions to which they would be entitled pursuant to Section 1.11 of this Adoption Agreement:

(A)¨Service Weighted Match:

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For this purpose, years of Vesting Service will be determined as of the beginning of the:

(i)¨Plan Year for which the Matching Employer Contribution is made.

(ii)¨Contribution Period for which the Matching Employer Contribution is made.

Note: The group of “eligible” Participants benefiting under each match rate must satisfy the nondiscriminatory coverage requirements of Code Section 410(b) and the group to whom the match rate is effectively available must not substantially favor HCEs.

(B)¨Age Weighted Match:

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For this purpose, age will be determined as of the beginning of the:

(i)¨Plan Year for which the Matching Employer Contribution is made.

(ii)¨Contribution Period for which the Matching Employer Contribution is made.

Note: The group of “eligible” Participants benefiting under each match rate must satisfy the nondiscriminatory coverage requirements of Code Section 410(b) and the group to whom the match rate is effectively available must not substantially favor HCEs.

(C)¨Age and Service Weighted Match:

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For this purpose, age and years of Vesting Service will be determined as of the beginning of the:

(i)¨Plan Year for which the Matching Employer Contribution is made.

(ii)¨Contribution Period for which the Matching Employer Contribution is made.

Note: The group of “eligible” Participants benefiting under each match rate must satisfy the nondiscriminatory coverage requirements of Code Section 410(b) and the group to whom the match rate is effectively available must not substantially favor HCEs.

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