Amendment to The Amphenol Corporation Employee Savings/401(K) Plan Adoption Agreement, effective January 1, 2022, dated November 17, 2021

DocuSign Envelope ID: 6A1D9318-3C32-4D88-BF8C-E8CC91EC8763

Exhibit 10.28

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.

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Accepted by:Fidelity Management Trust Company, as Trustee

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DocuSign Envelope ID: 6A1D9318-3C32-4D88-BF8C-E8CC91EC8763

ADDITIONAL PROVISIONS ADDENDUM

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for

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

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Sign on Bonus, Referral Bonus

Note:   The Participant group(s) 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: If the Employer has selected Safe Harbor Matching Employer Contributions or 401(k) Safe Harbor Formula any exclusion listed above must be a permitted exclusion under Section 1.414(s)-1(d)(2) of the Treasury Regulations. If the Employer has selected Safe Harbor Matching Employer Contributions, a Participant must also be permitted to make Deferral Contributions under the Plan sufficient to receive the full 401(k) Safe Harbor Matching Employer Contribution, determined as a percentage of Compensation meeting the requirements of Code Section 414(s).

Note: Compensation must be tested to show that it meets the requirements of Code Section 414(s) or, unless 401(k) Safe Harbor Formula has been selected, the allocations must be tested to show that they meet the general test under regulations issued under Code Section 401(a)(4). With respect to Matching Employer Contributions (other than 401(k) Safe Harbor Matching Employer Contributions), Compensation for purposes of applying the limitations on Matching Employer Contributions described in Section 6.10 of the Basic Plan Document (for deemed satisfaction of the "ACP" test), must be tested to show that it meets the requirements of Code Section 414(s).

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DocuSign Envelope ID: 6A1D9318-3C32-4D88-BF8C-E8CC91EC8763

Note:   If the Employer has elected a QACA in Option 1.07(a)(6)(D), then after the effective date of this election, any Participant automatically enrolled pursuant to this subparagraph (C) who was automatically enrolled under the QACA at the time of leaving employment shall be automatically enrolled at the same rate in effect immediately prior to his leaving employment plus any increases missed in accordance with paragraph (2) below (if applicable) prior to his Reemployment.

Note:   The Participant group(s) identified 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).

Employees of the AAOH Division.

Note: If the Employer has elected a QACA in Option 1.07(a)(6)(D), then after the effective date of this election, any Participant automatically enrolled under the Plan who was automatically enrolled under the QACA at the time of leaving employment shall be automatically enrolled at the same rate in effect immediately prior to his leaving employment plus any increases missed in accordance with paragraph (B) below (if applicable) prior to his Reemployment.

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DocuSign Envelope ID: 6A1D9318-3C32-4D88-BF8C-E8CC91EC8763

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:

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Effective 1/1/2020, 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:

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Effective 1/1/2020, 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:

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DocuSign Envelope ID: 6A1D9318-3C32-4D88-BF8C-E8CC91EC8763

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Effective 1/1/2022, 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:

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Note: The Employer may be required to satisfy the nondiscriminatory benefits requirement of Code Section 401(a)(4).

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Note: The eligible group(s) defined below must be definitely determinable 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).

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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    2). Effective 1/1/2017, 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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DocuSign Envelope ID: 6A1D9318-3C32-4D88-BF8C-E8CC91EC8763

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..

(b) Discretionary Formula - The Employer may decide each Contribution Period whether to make a discretionary Nonelective Employer Contribution on behalf of "eligible" Participants in accordance with Section 5.10 of the Basic Plan Document.

Note: The specific categories of "eligible" Participants should be such that resulting allocations are provided pursuant to a definite predetermined formula that complies with Treasury Regulations Section 1.401-1(b)(1)(ii).

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DocuSign Envelope ID: 6A1D9318-3C32-4D88-BF8C-E8CC91EC8763

Plan will not satisfy a design-based safe harbor pursuant to the regulations under Code Section 401(a)(4). If the Plan cannot be restructured, the Plan shall be required to satisfy the nondiscriminatory amount requirement by testing in accordance with Section 1.401(a)(4)-2(a) of the Treasury Regulations. If the Plan is required to pass cross-testing in accordance with Section 1.401(a)(4)-8 of the Treasury Regulations to satisfy the nondiscriminatory amount requirement and the Plan does not meet the exception found in Section 1.401(a)(4)-8(b)(1)(i)(B)(1) or (2), the Plan shall provide a minimum gateway contribution allocation to Participants who are not Highly Compensated Employees and who are required to benefit under this allocation formula equal to at least 1/3rd of the allocation rate for the Highly Compensated Employee benefiting under this allocation formula who has the highest allocation rate, provided that the Plan may instead provide a minimum gateway allocation to each such Participant equal to 5% of his “415 compensation”, as described in Section 6.01(m) of the Basic Plan Document. All Participants not included in an allocation group above shall be considered as not benefiting under this allocation for the Contribution Period unless otherwise is required to pass the nondiscriminatory amount testing pursuant to Section 1.401(a)(4)-8 of the Treasury Regulations. The Employer shall notify the Plan Administrator of the amount allocable to each group.

Note: The requirements of Treasury Regulations Section 1.401(k)-1(a)(6) (describing what constitutes a cash or deferred arrangement with respect to Self-Employed Individuals) applies to the allocation formula under this Option. Therefore, the allocation formula should be structured so that application of the formula does not create a cash or deferred arrangement with respect to a Self-Employed Individual (e.g., by permitting partners to directly or indirectly vary the amount of contribution made on their behalf).

(1) Loan not Due on Termination. If a Participant with an outstanding loan balance terminates employment with the Employer and all Related Employers, the outstanding principal and accrued interest on such loan shall not be immediately due and payable as provided in Section 9.11 of the Basic Plan Document. Instead, such loan shall continue to be payable in accordance with the provisions of the loan note and Article 9 of the Basic Plan Document.

19.05. Costs of Administration. All reasonable costs and expenses (including legal, accounting, and employee communication fees) incurred by the Administrator and the Trustee in administering the Plan and Trust may be paid from the forfeitures (if any) resulting under Section 11.08, from the suspense account described in this Section, if any, or from the remaining Trust Fund. All such costs and expenses paid from the remaining Trust Fund shall, unless allocable to the Accounts of particular Participants, be charged against the Accounts of all Participants as provided in the Service Agreement.

Amounts a service provider agrees to credit to the Plan in recognition of the service provider’s compensation for Plan services will be allocated to the Plan as follows: (a) to the extent an amount is attributable to a Permissible Investment, such amount shall be allocated to the Accounts of Participants and Beneficiaries pro rata based on the ratio that each Participant and Beneficiary’s balance in each such Permissible Investment bears to the total balances for all such Participants and Beneficiaries in such Permissible Investment; and, (b) to the extent an amount is a credit for float earnings of the Plan in excess of float expenses, such amount shall be allocated to a suspense account from which the Administrator may pay Plan expenses and/or allocate amounts to the Accounts of Participants and Beneficiaries pro rata based on their Account balances in the Trust excluding amounts invested in a loan pursuant to Article 9. Any amounts so allocated shall not constitute “annual additions” (as defined in Subsection 6.01(a)) under the Plan.