Use these links to rapidly review the document
TABLE OF CONTENTS

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

---

Table of Contents

---

Table of Contents

NOTICE OF 2018 ANNUAL MEETING OF STOCKHOLDERS

TIME AND DATE

11:00 a.m., Thursday, May 17, 2018

PLACE

Amphenol Corporation
World Headquarters
Conference Center
358 Hall Avenue
Wallingford, CT 06492
(203) 265-8900

AGENDA

1.

To elect ten directors as named for terms indicated in the Proxy Statement.

2.

To ratify the selection of Deloitte & Touche LLP as independent accountants.

3.

To conduct an advisory vote on compensation of named executive officers.

4.

To vote on the stockholder proposal set forth in the proxy statement, if properly presented at the Annual Meeting.

5.

To transact such other business as may properly come before the meeting and any postponements or adjournments thereof.

By Order of the Board of Directors
Lance E. D'Amico
Vice President, Secretary and General Counsel

April 13, 2018

—IMPORTANT—
PLEASE COMPLETE, DATE, SIGN AND RETURN
THE ACCOMPANYING PROXY WHETHER OR
NOT YOU PLAN TO ATTEND THE MEETING

   

Important Notice Regarding the Availability of Proxy Materials for the Stockholders Meeting to Be Held on May 17, 2018: The Proxy Statement and Annual Report to Stockholders for the fiscal year ended December 31, 2017 are available at www.edocumentview.com/APH.

---

Table of Contents

TABLE OF CONTENTS

i

---

Table of Contents

ii

---

Table of Contents

2018 Proxy Summary

        This summary highlights selected information contained elsewhere in this proxy statement. This summary does not contain all of the information that you should consider, and you should read the entire proxy statement and the 2017 Amphenol Annual Report to Stockholders carefully before voting.

Annual Meeting of Stockholders

Meeting Agenda and Voting Matters

iii

---

Table of Contents

Director Nominees

iv

---

Table of Contents

Governance

        The Company's most current Governance Principles, the Code of Business Conduct and Ethics and the Charters of the Audit Committee, the Compensation Committee and the Nominating/Corporate Governance Committee of the Board can be accessed via the Company's website at www.amphenol.com by clicking on "Investors", then "Corporate Governance", then "Governance Documents", then the desired principles, code or charter. A printed copy will also be provided to any stockholder of the Company free of charge upon written request to the Company, c/o Secretary, Amphenol Corporation, 358 Hall Avenue, Wallingford, Connecticut 06492.

Executive Compensation

        At the 2017 annual meeting of stockholders, the Company's stockholders cast a non-binding advisory vote regarding the compensation of the Company's named executive officers as disclosed in the proxy statement for that meeting. The Company's stockholders overwhelmingly approved the proposal with more than 97% of the shares voted being cast in favor of the proposal. These programs and policies remain intact, as described in detail beginning on page 25. The Company's core management compensation programs include base salary, an annual performance-based incentive plan payment opportunity, annual stock option awards (with 20% vesting each year over a five year period, except that vesting may be accelerated or continued in cases of death, disability, retirement or a change in control), insurance benefits and retirement benefits.

        Compensation programs for the named executive officers emphasize at-risk, performance-based elements. Fixed compensation elements, including base salary, retirement benefits and other compensation are designed to be market competitive for purposes of retention, and to a lesser extent, recruitment. However, it is intended that a larger part of the named executive officers' compensation be geared to reward performance that generates long-term stockholder value.

        For the Company's Chief Executive Officer, fixed compensation elements including salary, retirement benefits and "all other compensation" comprised approximately 15% of his total 2017 compensation. His at-risk compensation linked to increasing stockholder value comprised approximately 85% of his total 2017 compensation. These at-risk elements include stock options granted with an exercise price equal to the closing price of the Company's common stock on the date of grant which only generate value if the Company's share price increases after the grant date (the value ascribed to the options for purposes of calculating percentages in this paragraph is the grant date fair value calculated in accordance with ASC Topic 718, as further described in footnote (1) to the Summary Compensation Table on page 37). The other at-risk compensation is incentive plan compensation which historically has required year-over-year earnings per share ("EPS") growth before any amount is paid in addition to other considerations designed to motivate the Chief Executive Officer to generate long-term stockholder value, and rewards the Chief Executive Officer when Company revenues and EPS grow. For the Company's other named executive officers as a group, fixed compensation elements comprised approximately 25% of total 2017 compensation while at-risk compensation comprised approximately 75% of total 2017 compensation. As with the Chief Executive Officer, the fixed compensation elements for the other named executive officers include salary, retirement benefits and "all other compensation", while the at-risk items include stock options and incentive plan compensation linked to goals that encourage growth in revenues and either EPS or operating income, depending on the role of the named executive officer.

        The Board believes this compensation program is a valuable and appropriate tool which contributes to the Company's continuing success.

2017 Performance Highlights

        In 2017, the Company achieved new records in sales and adjusted diluted EPS. Sales grew 12% to $7.0 billion and adjusted diluted EPS grew 15% to $3.12 (adjustments to financial measures calculated in

v

---

Table of Contents

accordance with generally accepted accounting principles ("GAAP") are explained in more detail on page 31). The Company's level of profitability was strong, with adjusted net income as a percentage of sales exceeding 14% and adjusted operating margins reaching 20.4%. Our financial strength was clearly reflected in the Company's cash generation, with a record $1.14 billion in operating cash flow and $918 million in free cash flow, reconfirming the strength and discipline of the Amphenol organization. Most importantly, we continued to put our financial resources to work creating growth opportunities for the Company and value for our stockholders, through investing in new products and capabilities, acquiring new companies, increasing our dividend and repurchasing the Company's stock.

Investor Outreach

        Amphenol has continued to engage with key stockholders to discuss, among other items, governance issues to ensure that management and the Board understand and address issues that are important to the Company's stockholders. Through these engagements the Company has obtained valuable feedback. For example, in 2016, the Board adopted an amendment to the Company's By-Laws that, among other things, implemented "proxy access", which, subject to the requirements of the By-Laws, permits any stockholder or group of up to 20 stockholders that beneficially owns at least 3% of the Company's outstanding common stock continuously for three years to nominate candidates for election to the Board and to require the Company to list such nominees in the Company's proxy statement. In addition, in 2014, the Company lowered the threshold to call special meetings of stockholders from 50% to 25%. During recent years, the Company has also taken actions to declassify the Board and provide for the annual election of directors. It has also allowed stockholders to act by written consent and eliminated supermajority voting requirements in the Company's Articles of Incorporation and By-Laws.

        The Company has also continued to engage key stockholders to discuss other important topics, such as compensation practices and programs.

2019 Annual Meeting

vi

---

Table of Contents

PROXY STATEMENT

        This Proxy Statement (first mailed to stockholders on or about April 13, 2018) is furnished to the holders of the Class A Common Stock, par value $.001 per share ("Common Stock"), of Amphenol Corporation (the "Company" or "Amphenol") in connection with the solicitation of proxies for use at the Annual Meeting of Stockholders to be held in the Conference Center at the Company's Corporate Headquarters at 358 Hall Avenue, Wallingford, Connecticut 06492 (telephone (203) 265-8900) at 11:00 a.m. on Thursday, May 17, 2018 (the "Annual Meeting").

RECORD DATE

        The Board of Directors of the Company (the "Board") has fixed the close of business on March 19, 2018 as the Record Date for the 2018 Annual Meeting (the "Record Date"). Only stockholders of record at the Record Date are entitled to notice of and to vote at the Annual Meeting and any postponements or adjournments thereof, in person or by proxy. At the Record Date, there were 302,001,190 shares of Common Stock outstanding.

PROXIES

        The proxy accompanying this Proxy Statement is solicited on behalf of the Board for use at the Annual Meeting and any postponements or adjournments thereof. Each holder of Common Stock is entitled to one vote for each share of Common Stock held at the Record Date. The holders of record, present in person or by proxy, of a majority of the issued and outstanding shares of Common Stock shall constitute a quorum. Abstentions and broker non-votes are counted as present for quorum purposes.

        Shares will be voted in accordance with stockholder instructions. If a stockholder returns a signed proxy card that omits voting instructions for some or all matters to be voted on, the proxy holders will vote on all uninstructed matters in accordance with the recommendations of the Board. In addition, if a stockholder has returned a signed proxy card, the proxy holders will have, and intend to exercise, discretion to vote shares in accordance with their best judgment on any matters not identified in the Proxy Statement on which a vote is taken at the Annual Meeting. At present, the Company is not aware of any such matter.

        For stockholders that hold their shares through an account with a broker and do not give voting instructions on a matter, under the rules of the New York Stock Exchange, the broker is permitted to vote in its discretion only on Proposal 2 (ratification of selection of the independent accountants) and is required to withhold its vote on each of the other proposals, the withholding of which is referred to as a "broker non-vote."

        A proxy may be revoked. For shares that are held in "street name", the stockholder must follow the directions provided by its bank, broker or other intermediary for revoking or modifying voting instructions. For shares that are registered in the stockholder's own name, the proxy may be revoked by written notification to the Company Secretary prior to its exercise and providing relevant name and account information, submitting a new proxy card with a later date (which will override the earlier proxy) or voting in person at the Annual Meeting.

        Votes on each of the proposals other than election of directors are advisory and therefore not binding on the Company. However, the Board will consider the outcome of these votes in its future deliberations.

        The inspectors of election appointed for the Annual Meeting with the assistance of the Company's transfer agent, Computershare Trust Company, N.A., will tabulate the votes.

        The Company pays the cost of preparing, printing, assembling and mailing this proxy soliciting material. The Company has engaged the firm of Georgeson LLC to assist in the distribution of this Notice of 2018 Annual Meeting and Proxy Statement and will pay Georgeson LLC its out of pocket expenses for such services. The Company will reimburse brokerage houses and other custodians, nominees and

1

---

Table of Contents

fiduciaries for their reasonable out-of-pocket expenses for forwarding proxy and solicitation materials to stockholders. Georgeson LLC has also been retained to assist in soliciting proxies for a fee not expected to exceed $8,500, plus distribution costs and other costs and expenses. Proxies may also be solicited from some stockholders personally, by mail, e-mail, telephone or other means of communication by the Company's directors, officers and regular employees who are not specifically employed for proxy solicitation purposes and who will not receive any additional compensation.

2

---

Table of Contents

SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS

        Listed in the following table are those stockholders known to Amphenol to be the beneficial owners of more than five percent of the Company's Common Stock as of December 31, 2017.

3

---

Table of Contents

SECURITY OWNERSHIP OF MANAGEMENT

        Set forth below is certain information with respect to beneficial ownership of the Company's Common Stock as of April 2, 2018 by each director, the named executive officers (listed in the Summary Compensation Table on page 37) and by all executive officers and directors of the Company as a group. Except as otherwise noted, the individuals listed in the table below have the sole power to vote or transfer the shares reflected in the table.

4

---

Table of Contents

SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

        Section 16(a) of the Securities Exchange Act of 1934 requires that the Company's executive officers and directors, and any persons who own more than 10% of the Common Stock, file reports of initial ownership of the Company's Common Stock and subsequent changes in that ownership with the Securities and Exchange Commission ("SEC") and furnish the Company with copies of all forms they file pursuant to Section 16(a). As a practical matter, the Company seeks to assist its directors and officers by monitoring transactions and completing and filing reports on their behalf.

        Based solely upon a review of the filings with the SEC and written representations from directors and executive officers that no other reports were required, the Company believes that all executive officers and directors of the Company filed all required reports on a timely basis with respect to 2017 and prior fiscal years, except that on February 21, 2018 a Form 4 was filed with the SEC reporting the sale of 2,000 shares of Common Stock which were inadvertently not previously reported by Mr. Lord and on March 1, 2018 a Form 4 was filed with the SEC reporting the sale of 15,000 shares of Common Stock which were inadvertently not previously reported by Mr. Walter.

5

---

Table of Contents

PROPOSAL 1. ELECTION OF DIRECTORS

        The Restated Certificate of Incorporation and the By-Laws of the Company, taken together, provide for a Board consisting of not less than three or more than 15 directors. Currently, the number of directors of the Company is ten. Our directors are elected annually. Action will be taken at the Annual Meeting for the re-election of ten directors: Ronald P. Badie, Stanley L. Clark, John D. Craig, David P. Falck, Edward G. Jepsen, Martin H. Loeffler, John R. Lord, R. Adam Norwitt, Diana G. Reardon and Anne Clarke Wolff for a term of one year that will expire at the 2019 Annual Meeting.

        It is intended that the proxies delivered pursuant to this solicitation will be voted in favor of the election of Messrs. Badie, Clark, Craig, Falck, Jepsen, Loeffler, Lord, Norwitt and Mmes. Reardon and Wolff, except in cases of proxies bearing contrary instructions. In the event that any of these nominees should become unavailable for election for any presently unforeseen reason, the persons named in the proxy will have the right to use their discretion to vote for a substitute.

        Certain information regarding all directors, including individual experience, qualifications, attributes and skills that led the Board to conclude that the director should serve on the Board is set forth below. The Company's goal is to assemble a Board that works together and with management to deliver long term stockholder value. The Company believes that the nominees and directors set forth below, each of whom is currently a director of the Company, possess the skills and experience necessary to guide the Company in the best interests of its stockholders. The Company's current Board consists of individuals with proven records of success in their chosen professions and with the Company. They all have high integrity and keen intellect. They are collegial yet independent in their thinking, and have demonstrated the willingness to make the time commitment necessary to be informed about the Company and its relevant industry, including its customers, suppliers, competitors, stockholders and management. Members of the Board also have extensive experience in leadership, the management of public companies, risk assessment, accounting and finance, capital markets, mergers and acquisitions, technology and global business practices and operations.

        The following information details offices held and other business directorships of public companies during the past five years of each of the proposed director nominees. Beneficial ownership of equity securities of the current directors and the proposed director nominees is shown under the caption Security Ownership of Management on page 4.

6

---

Table of Contents

DIRECTOR NOMINEES

7

---

Table of Contents

8

---

Table of Contents

9

---

Table of Contents

THE BOARD OF DIRECTORS RECOMMENDS A VOTE FOR EACH OF THE
NOMINEES FOR ELECTION TO THE BOARD OF DIRECTORS.

10

---

Table of Contents

THE BOARD OF DIRECTORS AND THE COMMITTEES OF THE BOARD

Governance Principles

        Amphenol's Corporate Governance Principles meet or exceed the Listing Standards of the New York Stock Exchange (the "NYSE Listing Standards"), including guidelines for determining director independence and reporting concerns to non-employee directors and the Audit Committee. The Company's most current Governance Principles, the Code of Business Conduct and Ethics and the Charters of the Audit Committee, the Compensation Committee and the Nominating/Corporate Governance Committee are reviewed at least annually and revised as warranted. Amphenol's Code of Business Conduct and Ethics applies to all employees, directors and officers of the Company and its subsidiaries. The principles, code and charters can be accessed via the Company's website at www.amphenol.com by clicking on "Investors", then "Corporate Governance", then "Governance Documents", then the desired principles, code or charter. A printed copy of the Company's most current Corporate Governance Principles, the Code of Business Conduct and Ethics and the Audit Committee Charter, the Compensation Committee Charter and the Nominating/Corporate Governance Committee Charter will also be provided to any stockholder of the Company free of charge upon written request to the Secretary of the Company, Amphenol Corporation, 358 Hall Avenue, Wallingford, Connecticut 06492.

Director Independence

        The Board has adopted the definition of "independent director" set forth in the NYSE Listing Standards to assist it in making determinations of independence. In addition to applying these guidelines, the Board will consider all relevant facts and circumstances in making an independence determination.

        The Board considered Ms. Wolff's role as Head of Global Corporate Banking and Global Leasing at Bank of America Merrill Lynch ("BAML") and the Company's current financial relationships with BAML, including BAML's role as a lender under the Company's revolving credit facility, and determined that these relationships do not impair her independence. The Board has determined that all of the directors are independent of the Company and its management with the exception of Mr. Norwitt and Ms. Reardon who are considered inside directors because of their current or recent employment with the Company.

Leadership Structure

        Mr. Loeffler is Chairman of the Board and Mr. Falck is the Board's Presiding Director. As Presiding Director, Mr. Falck has the authority to call, schedule and chair executive sessions of the independent directors. After each Board meeting, committee meeting and executive session the Chairman and Presiding Director communicate with the Chief Executive Officer to provide feedback and to effectuate the decisions and recommendations of the directors.

        The Board of Directors has determined that at the present time, its current leadership structure, including a Presiding Director, a Chairman of the Board who retired from employment with the Company in 2010 after 37 years of service and a Chief Executive Officer who is an inside director, is appropriate and allows the Board to fulfill its duties effectively and efficiently based on the Company's current needs. The Presiding Director and independent Chairman of the Board provide a means for the Board to effectively operate independently of the Company's management as necessary or desirable. This structure also allows the Board to draw upon the skills and extensive experience of a Chairman, who can ensure that the other directors' attention is devoted to the issues of greatest importance to the Company and its stockholders, while permitting the Chief Executive Officer to continue to set the strategic direction and drive the ongoing business operations and finances of the Company, all in consultation with the Board of Directors.

11

---

Table of Contents

Board of Directors Summary Information

        The following table sets forth basic information about the current structure of the Board including summary information for the nominees to the Board.

Committees

        The Board has five standing committees: the Audit Committee, the Compensation Committee, the Executive Committee, the Pension Committee and the Nominating/Corporate Governance Committee. The Board has determined that all the members of the Audit Committee, the Compensation Committee and the Nominating/Corporate Governance Committee are independent and satisfy the relevant SEC and the New York Stock Exchange independence requirements for the members of such committees. The Board has determined that all members of the Executive Committee and the Pension Committee are independent, except for Ms. Reardon.

        Audit Committee.     The Audit Committee operates under a written charter adopted by the Board. As described more fully in its charter, the principal oversight duties of the Audit Committee include the following: (1) review reports on the evaluation of the Company's internal controls for financial reporting and the Company's annual audited and quarterly unaudited financial statements and related disclosures therein under "Management's Discussion and Analysis of Financial Condition and Results of Operations"; (2) review the Company's earnings press releases; (3) select, engage, evaluate and replace, if deemed necessary, the independent auditors and approve all audit engagement fees and terms and pre-approve all permissible tax and other non-audit services; (4) review the qualifications, performance and independence of the Company's independent auditors; (5) review and approve the scope of the annual audit of the Company's financial statements; (6) review the scope and coverage of the Company's internal audit plan; (7) review the results of internal audits and the procedures for maintaining internal controls; (8) review the integrity of the Company's financial reporting processes and the selection and quality of the Company's accounting principles; (9) review critical accounting principles and practices and applicable legal and regulatory standards and principles and their effect on the financial statements of the Company;

12

---

Table of Contents

(10) review significant audit issues identified by the Company's internal audit function or the Company's independent auditors and the Company's responses thereto; (11) review accounting adjustments noted or proposed by the Company's independent auditors, reports on the Company's internal controls, and material written communications with the independent auditors; (12) review and discuss the Company's guidelines and policies for risk assessment and management; (13) establish Company hiring policies for employees of the Company's independent auditors; (14) establish procedures for the receipt, retention and treatment of employee concerns regarding questionable accounting or auditing matters; and (15) sustain a constructive dialogue with the independent auditors about significant matters relevant to the audit of the financial statements of the Company and of internal control over financial reporting. See also Report of the Audit Committee on page 22. The members of the Audit Committee are Ronald P. Badie, Stanley L. Clark, David P. Falck and Edward G. Jepsen (Chairman), each of whom is an independent director as defined under the NYSE Listing Standards. The Board of Directors has determined that Messrs. Badie and Jepsen are audit committee financial experts as defined by the applicable rules of the SEC and the NYSE Listing Standards, and that each of the members of the Audit Committee is sufficiently proficient in reading and understanding the Company's financial statements to serve on the Audit Committee.

        Compensation Committee.     The Compensation Committee establishes the principles related to the compensation programs of the Company. It approves compensation guidelines, reviews the role and performance of executive officers and key management employees of the Company and its subsidiaries, approves the base compensation, incentive plan target and award and the allocation of stock option awards, if any, for the Chief Executive Officer and reviews and approves the recommendations of the Chief Executive Officer for base compensation and adjustments in base compensation, incentive plan targets and allocations and stock option awards, if any, for the direct reports to the Chief Executive Officer as well as the Company's other top 20 most highly compensated employees. See also the Compensation Discussion and Analysis on page 25 and the Compensation Committee Report on page 36. The Compensation Committee has the authority to retain and solicit the advice of compensation advisors. The members of the Compensation Committee are Stanley L. Clark, David P. Falck, and John R. Lord (Chairman).

        Executive Committee.     The Executive Committee is empowered to exercise the powers and authority of the Board during the intervals between meetings of the Board. Notwithstanding the foregoing, the Executive Committee does not have power or authority to: (i) approve any transactions or expenditures in an amount exceeding $50 million; (ii) amend the Company's Charter or Bylaws; (iii) adopt an agreement or plan of merger, share exchange, or consolidation to which the Company is a party; (iv) recommend to the stockholders any action that requires stockholder approval including, but not limited to, (a) the sale, lease, or exchange of all or substantially all of the Company's property or assets or (b) a dissolution of the Company or a revocation of a dissolution of the Company; (v) remove any executive officer from his or her position, or appoint any new executive officer, (vi) declare a dividend or authorize the issuance of capital stock of the Company; or (vii) take any other action or exercise any authority prohibited by law or the Company's Charter or Bylaws. The Executive Committee meets as necessary and all actions of the Committee are presented to the full Board at the next meeting of the Board. The members of the Executive Committee are Ronald P. Badie (Chairman), John R. Lord and Diana G. Reardon.

        Pension Committee.     The Pension Committee administers the Company's various defined contribution 401(k) plans and the U.S. pension plan (the "Pension Plan"—for more information on the Pension Plan, see the section entitled Pensions and Deferred Compensation beginning on page 42). The Pension Committee has oversight responsibility for funding and investments in the U.S. pension plan and consults with the Chief Financial Officer and the Treasurer of the Company at least annually and with the actuarial consultants and other advisors and the trustee and investment managers of the assets of the Company's U.S. pension plan as it deems necessary and appropriate. The Pension Committee reviews the liabilities, assets and investments of the Company's U.S. pension plan as a Committee at least semi-annually. It also ensures there is an appropriate selection of diverse investments for employees of the

13

---

Table of Contents

Company participating in the various defined contribution 401(k) plans. The members of the Pension Committee are Ronald P. Badie, Stanley L. Clark (Chairman), Edward G. Jepsen and Diana G. Reardon.

        Nominating/Corporate Governance Committee.     The Nominating/Corporate Governance Committee's principal duties include the following: (1) assisting the Board in identifying appropriate individuals qualified to serve as directors of the Company and evaluating the qualifications of such individuals; (2) selecting, or recommending that the Board select, the candidates for all directorships to be filled by the Board or by the stockholders; (3) developing and recommending to the Board a set of corporate governance guidelines applicable to the Company; and (4) overseeing and discussing, as necessary and appropriate, a plan for the continuity and development of senior management of the Company. The Nominating/Corporate Governance Committee also oversees the annual evaluation of and the compensation of the Board. The members of the Nominating/Corporate Governance Committee are David P. Falck (Chairman), Edward G. Jepsen and John R. Lord.

        The Nominating/Corporate Governance Committee will consider candidates for Board membership suggested by its members and other Board members, as well as by management and stockholders. A stockholder may recommend any person for consideration as a nominee for director by writing to the Nominating/Corporate Governance Committee, c/o Secretary, Amphenol Corporation, 358 Hall Avenue, Wallingford, CT 06492. Recommendations must be received by December 31, 2018 to be considered for inclusion in the Proxy Statement for the 2019 Annual Meeting of Stockholders, and must comply with the requirements in the Company's by-laws. Recommendations must include the name and address of the stockholder making the recommendation, a representation that the stockholder is a holder of record of Common Stock, biographical information about the individual recommended and any other information the stockholder believes would be helpful to the Nominating/Corporate Governance Committee in its evaluation of the individual being recommended by the stockholder as a nominee for director.

        Potential candidates for the Board will be evaluated by the Nominating/Corporate Governance Committee on the basis of:

•

character, judgment, personal and professional ethics, integrity and values;



•

business, financial and/or other applicable experience;



•

familiarity with national and international issues affecting the Company's business;



•

depth of experience, skills and knowledge complementary to the Board and the Company's business; and



•

ability and willingness to devote sufficient time to effectively carry out the duties and responsibilities of a director of the Company.

        The Board believes that an important component of a Board is diversity including not only background, skills, experience, and expertise, but also gender, race and culture. To the extent used, search firms retained by the Nominating/Corporate Governance Committee to assist in identifying qualified candidates will be specifically advised to seek diverse candidates from traditional and non-traditional environments, including women and minorities. The Nominating/Corporate Governance Committee may also consider such other relevant factors as it deems appropriate. It will make a recommendation to the full Board as to any persons it believes should be nominated by the Board, and the Board will determine the nominees after considering the recommendation and report of the Nominating/Corporate Governance Committee. The process for considering candidates recommended by a stockholder for Board membership will be no different than the process for candidates recommended by members of the Nominating/Corporate Governance Committee, other members of the Board or management. In connection with the identification and appointment of Ms. Wolff, the Board engaged a reputable international search firm.

14

---

Table of Contents

        The full Board meets at least annually with the Nominating/Corporate Governance Committee to review and discuss the Nominating/Corporate Governance Committee's self-evaluation including its performance as measured against its Charter and the continuing effectiveness of its Charter as well as the corporate governance guidelines that it is responsible for developing and recommending to the Board.

Meetings of the Board and Committees

        During 2017 there were seven formal meetings of the Board and ten actions taken by unanimous written consent of the Board, six formal meetings and one action by unanimous written consent of the Audit Committee, two formal meetings and two actions by unanimous written consent of the Compensation Committee, and two formal meetings of the Pension Committee. The Executive Committee had one formal meeting and acted on six matters by unanimous written consent. The Nominating/Corporate Governance Committee had three formal meetings and one action by unanimous written consent. All director nominees participated in all meetings of the Board and the Committees on which they served in 2017. Directors also attended meetings as invited guests of Committees on which they did not serve. This included quarterly telephonic meetings of the Audit Committee during which quarterly results were discussed and quarterly press releases reporting operating results were reviewed and approved.

        The independent directors of the Company meet in executive session as necessary and following the conclusion of each Board meeting and each committee meeting. Such private meetings are currently presided over by the Chairman of the Board, the Presiding Director, the chairman of the committee or by the director who requests the opportunity to meet in executive session.

Risk Oversight

        The Board is actively involved in overseeing risk management for the Company. This oversight is conducted primarily through the committees of the Board. The chairman of each committee discusses with the Board such risk management considerations and actions as are deemed necessary and appropriate.

        The Audit Committee reviews the Company's portfolio of risk with management and the Company's independent accountants, discusses with management significant financial risks, the Company's policies with respect to risk assessment and risk management and the actions management has taken to limit, monitor and control financial and other risk exposures. The Audit Committee also reviews the Company's internal system of audit and financial controls and the process for maintaining financial reporting controls with management and the Company's independent accountants. Cyber risk is also reviewed by the Audit Committee.

        The Compensation Committee oversees risk management as it relates to compensation plans, policies and practices in connection with structuring the Company's executive compensation programs and incentive compensation programs for other employees. The Compensation Committee reviews with management whether the compensation programs, including the performance-based incentive plans and the stock option plans described in the section entitled Elements of Compensation Program beginning on page 27, are reasonably likely to create incentives for employees that may cause such employees to take excessive or inappropriate risks which could have a material adverse effect on the Company. The Compensation Committee and management have concluded the Company's compensation programs are not reasonably likely to create incentives for employees that may cause such employees to take excessive or inappropriate risks which could have a material adverse effect on the Company.

        The Nominating and Corporate Governance Committee also facilitates an annual review by the full Board regarding the practices of management of the Company related to the identification and evaluation of enterprise risk and the development of risk avoidance, mitigation and response strategies.

15

---

Table of Contents

        The Pension Committee oversees risk management as it relates to the Company's U.S. pension plan described beginning on page 42. The Pension Committee reviews with management the forecasted liabilities of the U.S. pension plan, the actuarial assumptions used in determining those liabilities, the investments funding those anticipated obligations, the periodic performance of those investments and, as necessary, reviews and recommends revisions to the general investment policies governing the investment of the assets of such pension plan.

Director Compensation for the 2017 Fiscal Year

        The following table contains information relating to compensation of the Company's directors who are not named executive officers. The only director who is also a named executive officer is Mr. Norwitt. His compensation is described in more detail in the "Summary Compensation Table" on page 37 and in the section entitled Compensation of Named Executive Officers beginning on page 31. Ms. Reardon is a director of the Company, and was also employed by the Company in the role of Senior Advisor in 2017. Ms. Wolff was not a director in 2017. Currently, non-employee director compensation consists solely of an annual retainer fee, committee chairman fees and an annual grant of restricted stock.

16

---

Table of Contents

17

---

Table of Contents

        Action will be taken at the Annual Meeting for the election of ten directors. Nine are non-employee directors: Messrs. Badie, Clark, Craig, Falck, Jepsen, Loeffler, Lord and Mmes. Reardon and Wolff. One of the directors, Mr. Norwitt, is an employee of the Company, serving as President and CEO.

        The retainer fee for the Chairman of the Board is $180,000 per year. The other non-employee directors receive an annual retainer fee of $80,000 per year plus, if applicable, (a) an additional retainer fee for the Audit Committee Chairman of $12,000 per year and/or (b) an additional retainer fee for chairpersons of the other committees of the Board of $8,000 per year. Non-employee directors can elect to receive their director fees in cash as earned or defer payment of their fees to a future date with the ultimate payment in cash or Common Stock. All non-employee directors currently receive their director fees in cash as earned quarterly.

        The 2012 Directors Restricted Stock Plan of Amphenol Corporation (the "Directors Restricted Stock Plan") provides annual grants of restricted stock to the non-employee directors on the first business day after each annual meeting of stockholders. On the grant date, each non-employee director will be given shares of Common Stock subject to the restrictions and conditions in the Directors Restricted Stock Plan. Commencing in 2016, the number of shares granted has been determined by dividing $140,000 by the closing price for the Common Stock on the grant date and rounding up to the next whole share amount. The closing price of the Common Stock on May 19, 2017, the date on which 1,921 restricted shares were granted to Messrs. Badie, Clark, Falck, Jepsen, Loeffler and Lord pursuant to the Directors Restricted Stock Plan, was $72.90, and on July 28, 2017, the date on which 1,379 shares were granted to Mr. Craig pursuant to the Director's Restricted Stock Plan was $76.13.

        The Nominating/Corporate Governance Committee will continue to monitor and make recommendations to the Company and to the Board regarding the annual retainer fee, committee fees and equity compensation elements of the directors' compensation program to ensure that total director compensation is fair and reasonable and competitive for the purpose of attracting and retaining qualified directors. The Board recognizes that the equity compensation element of the directors compensation program enables share ownership by directors further aligning their financial interests consistent with their oversight role for the Company.

Communications with the Board of Directors

        Stockholders and other interested parties may communicate directly with members of the Board of Directors c/o Secretary, Amphenol Corporation, 358 Hall Avenue, Wallingford, CT 06492. All communications will be promptly forwarded to the appropriate directors for their review, except that the Board has instructed the Secretary not to forward solicitations, bulk mail or communications that address improper or irrelevant topics or requests for general information.

Board Member Attendance at Annual Meeting of Stockholders

        In each of the last ten years, more than 85% of outstanding shares of Common Stock have been voted by proxy and no more than five non-employee stockholders (representing only a nominal number of shares) have personally attended any of the Company's Annual Meetings of Stockholders. Accordingly, the Company does not require members of the Board to attend the Annual Meeting of Stockholders. The only then current Board member who attended the 2017 Annual Meeting of Stockholders was Mr. Norwitt, as President and Chief Executive Officer.

18

---

Table of Contents

EXECUTIVE OFFICERS WHO ARE NOT DIRECTORS

19

---

Table of Contents

20

---

Table of Contents

21

---

Table of Contents

REPORT OF THE AUDIT COMMITTEE

        The Audit Committee has undertaken a review of its charter, practices and procedures in order to assure continuing compliance with the provisions of the Sarbanes-Oxley Act of 2002 and related regulatory requirements promulgated by the SEC and the NYSE. Following that review, the Audit Committee confirmed its Charter and its policies and practices. The Audit Committee Charter is available on the Company's website at www.amphenol.com by clicking on "Investors", then "Corporate Governance", then "Governance Documents", and then "Audit Committee Charter". In addition, a printed copy of the most current Audit Committee Charter will also be provided to any stockholder free of charge upon written request to Amphenol Corporation, Secretary, 358 Hall Avenue, Wallingford, Connecticut 06492.

        The Audit Committee reports as follows:

1.

The Audit Committee has reviewed and discussed the Company's audited financial statements for the year ended December 31, 2017 with Company management, which has primary responsibility for establishing and maintaining adequate internal financial controls, preparing the Company's quarterly and annual financial statements and for the Company's public reporting process, and with Deloitte & Touche LLP, the Company's independent accountants for 2017, which is responsible for expressing an opinion on the conformity of the Company's audited financial statements with generally accepted accounting principles and its own assessment of the Company's internal control over financial reporting.



2.

The Audit Committee has discussed with Deloitte & Touche LLP those matters required to be discussed by professional auditing standards including, without limitation, those matters required to be discussed by Auditing Standards No. 61, as amended (AICPA, Professional Standards, Vol. 1. AU section 380) as adopted by the Public Company Accounting Oversight Board in rule 3200T.



3.

The Audit Committee has received the letter and written disclosures from Deloitte & Touche LLP required by applicable requirements of the Public Company Accounting Oversight Board regarding the independent accountant's communications with the Audit Committee concerning independence and has discussed with Deloitte & Touche LLP that firm's independence. The Audit Committee has also determined that Deloitte & Touche LLP's provision of audit and non-audit services to the Company is compatible with that firm's independence.



4.

Based on the review and discussions referred to above, the Audit Committee has recommended to the Board and the Company that the audited consolidated financial statements be included in its Annual Report on Form 10-K for the year ended December 31, 2017 for filing with the Securities and Exchange Commission. The Audit Committee has also selected Deloitte & Touche LLP as independent accountants of the Company for fiscal year 2018.

22

---

Table of Contents

AUDIT AND NON-AUDIT FEES

        Fees billed to the Company by Deloitte & Touche LLP, our independent auditor, for services rendered in 2017 and 2016 were as follows:

PRE-APPROVAL OF AUDITOR SERVICES

        The Audit Committee has adopted and implemented approval policies and procedures related to the provision of permissible audit, audit-related, tax and other non-audit services by the Company's independent accountants. Under these procedures, the Audit Committee has pre-approved the use of the independent accountants for specific types of services. These specific types of services include, but are not limited to, instances where total fees are not expected to exceed $25,000 plus reimbursable expenses in connection with audits, services provided in connection with audits, merger and acquisition due diligence, tax services, internal control reviews and reviews of employee benefit plans. The Audit Committee has elected to delegate pre-approval authority to the Chairman of the Audit Committee. All engagements performed by the Company's independent accountants are to be reported to the Audit Committee on no less frequently than a quarterly basis. Any permitted services by Deloitte where the estimated cost of such services is expected to exceed $25,000 for any given project must be pre-approved by the Audit Committee or the Chairman of the Audit Committee to ensure compatibility with maintaining the accountants' independence. In 2017, all fees for permitted services were pre-approved in accordance with these policies.

HIRING RESTRICTIONS ON FORMER EMPLOYEES OF AUDITOR

        The Audit Committee has also reviewed and confirmed Company policies and procedures imposing restrictions on the hiring of certain individuals employed by or formerly employed by the Company's independent accountants including any employee or former employee of the Company's independent accountants who currently has or who has previously had any responsibility for the performance of any audit work for the Company or any involvement with the certification of the Company's financial statements.

23

---

Table of Contents

PROPOSAL 2. RATIFICATION OF INDEPENDENT ACCOUNTANTS

        The Audit Committee of the Board of Directors has considered the performance and qualifications of Deloitte & Touche LLP and has selected Deloitte & Touche LLP to act as independent accountants to examine the financial statements of the Company for the current fiscal year. Deloitte & Touche LLP has acted as independent accountants for the Company since 1997, and the Audit Committee and management have considered and believe it desirable and in the best interests of the Company to continue the engagement of that firm. Representatives of Deloitte & Touche LLP are expected to be present at the Annual Meeting. Such representatives are expected to have the opportunity to make a statement if they desire to do so, and are expected to be available to respond to appropriate questions.

        If the selection of Deloitte & Touche LLP is not ratified by an affirmative vote of a majority of the shares, present in person or represented by proxy at the Annual Meeting, the Audit Committee will review its future selection of independent accountants in light of that result.

        The Board is asking stockholders to approve the following advisory resolution at the 2018 Annual Meeting:

        RESOLVED, that the selection by the Audit Committee of the Board of Directors of the firm of Deloitte & Touche LLP as independent public accountants for the Company for the year 2018 is hereby RATIFIED.

THE BOARD OF DIRECTORS RECOMMENDS A VOTE FOR APPROVAL OF THE ADVISORY RESOLUTION FOR RATIFICATION OF SELECTION OF INDEPENDENT ACCOUNTANTS

24

---

Table of Contents

COMPENSATION DISCUSSION & ANALYSIS

        Overview of Compensation.     The Compensation Committee of the Board (referred to in this Compensation Discussion & Analysis as the "Committee") has responsibility for establishing, implementing and continually monitoring adherence with the Company's compensation philosophy and guidelines. A primary goal of the compensation philosophy and these guidelines is to align the interests of management with the stockholders to drive stockholder value through performance. In allocating the Company's resources towards compensation, the Committee strives to ensure that the total compensation paid to executive officers and key management employees is appropriate and reasonable, while, at the same time, capable of attracting, motivating and retaining the executive officers and key management employees of the Company. The Committee endeavors to keep the structure of the Company's compensation programs simple, transparent and broad-based. The Company's core management compensation programs include base salary, an annual performance-based incentive plan payment opportunity, annual stock option awards, insurance benefits and retirement benefits.

        Throughout this Proxy Statement, the Company's Chief Executive Officer and the Chief Financial Officer together with the three other individuals included in the Summary Compensation Table on page 37, are referred to as the "named executive officers". References to "executive officers and key management employees" in this Proxy Statement relate to the approximately 680 management personnel of the Company, including the named executive officers, who participated in the Company's core management compensation programs in 2017.

        The Committee has concluded that its compensation policies and programs are not reasonably likely to create incentives for employees that may cause such employees to take excessive or inappropriate risks which could have a material adverse effect on the Company.

        Say on Pay.     At the 2017 Annual Meeting, the Company's stockholders cast a non-binding advisory vote regarding the compensation of the Company's named executive officers as disclosed in the proxy statement for the 2017 Annual Meeting of Stockholders. The proposal received overwhelming support with more than 97% of the shares voted being cast in favor of the proposal. The Board appreciates this show of support, which reaffirms to the Board that the Company's current management compensation policies and programs work to support our stockholders' objectives. The Company believes the philosophy and objectives of its management compensation program, as well as the implementation of the elements of the compensation program, are appropriately geared towards aligning the interests of management with the stockholders to drive stockholder value. No material changes were made to the structure of the Company's core management compensation programs in 2017.

        The Compensation Committee.     The Committee is currently composed of three independent directors. The activities and actions of the Committee are subject to the review of the full Board. All actions of the Committee are reported to the Board no later than the next subsequent meeting of the full Board following any Committee action.

        The Committee has responsibility, from time to time, but at least annually, to:

•

Review and approve the overall compensation philosophy and guidelines for all executive officers and key management employees of the Company and its subsidiaries.



•

Complete an annual performance evaluation of itself.



•

Review and approve changes as necessary and appropriate to the Company's 2014 Executive Incentive Plan (as defined on page 27), the Company's annual Management Incentive Plan and the Company's Stock Option Plans as described beginning on pages 27 and 29, respectively.



•

Review and approve the goals relevant to compensation for, and evaluate the performance of, the Company's Chief Executive Officer and determine and approve, as deemed necessary and appropriate, any changes in compensation including the level of his base salary, performance-based

25

---

Table of Contents

incentive plan target, performance-based incentive plan payments and/or option awards. Approve any performance based incentive plan payments and/or any option awards to the Company's Chief Executive Officer.

•

Review and approve recommendations from the Company's Chief Executive Officer related to the performance-based incentive plan awards and stock option awards and other related matters for all other executive officers and key management employees and any prospective senior management employees of the Company and its subsidiaries.



•

Review and approve recommendations from the Company's Chief Executive Officer related to specific adjustments to individual base salary and incentive plan targets and allocations for all executives reporting directly to the Chief Executive Officer and the other top 20 paid executives of the Company based on annual base salary for employees of the Company and its subsidiaries.



•

Review and approve the Compensation Committee Report for inclusion in the Company's annual Proxy Statement.

        Role of Compensation Consultant in Compensation Decisions.     The Committee has retained Meridian Compensation Partners,  LLC ("Meridian"), an independent compensation consultant, to advise it from time to time on executive and board compensation matters. Meridian reports directly to the Committee and the Committee has sole authority to negotiate the terms of service, including all fees paid to Meridian.

        Role of Executive Officers in Compensation Decisions.     In establishing, reviewing and assessing the appropriateness of compensation levels and adjustments in compensation levels for the executive officers (other than the Chief Executive Officer) and key management employees and prospective senior management employees, the Committee considers the recommendations of certain executive officers of the Company. Mr. Norwitt is particularly involved. Mr. Norwitt and certain executive officers of the Company review the performance and compensation of the executive officers and key management employees at least annually and any prospective senior management employees as necessary. As part of this process general compensation surveys may be considered. These surveys are generally comprised of widely available information which is generally accessible for purchase or provided without charge to the Company in exchange for participation in the survey. The Company's human resources department, including the Vice President, Human Resources, provides data, information and feedback based on its general knowledge of compensation inside and outside of the Company. The accounting department and legal department, including the executive officers in those departments, also compile and analyze data and share this with Mr. Norwitt. The recommendations of these executive officers, including Mr. Norwitt, regarding any salary adjustments, annual performance-based incentive plan payments and annual option award amounts based on individual and operating unit performance, are presented to the Committee. The Committee exercises its discretion in modifying and approving any such recommendations. The Committee's compensation actions are then submitted to the full Board for ratification and approval. Mr. Norwitt consults with the Committee on essentially all compensation matters but does not participate in the evaluation or determination of his own compensation.

        Mr. Norwitt does not vote on any compensation matters considered by the Committee. However, he is available to the Committee as an additional resource to respond to questions and discuss individual and operating unit performance, as well as related compensation matters. The Committee also meets informally from time to time and in executive session following each meeting to discuss compensation matters without Company employees present.

        Philosophy and Objectives of Compensation Program.     The Committee continues to strive to develop, refine and implement a complete and straightforward compensation program that helps to attract, motivate and retain the executive officers and key management employees, and that remains competitive with comparable companies. The program is designed to promote decision making geared to increasing stockholder value by rewarding executive officers and key management employees who contribute to

26

---

Table of Contents

increasing stockholder value. The Committee believes that to further these objectives, executive compensation packages should include both cash and equity-based compensation as well as reasonable benefits.

        Elements of Compensation Program.     The Committee endeavors to provide an appropriate mix of different elements of compensation, including finding a balance among (i) fixed versus at-risk compensation, (ii) current versus long-term compensation, (iii) cash versus equity-based compensation and (iv) basic benefits. Cash payments primarily reward recent performance and equity-based awards encourage key management employees, including the named executive officers, to continue to deliver results over a longer period of time and serve as a retention tool. The Committee generally strives to provide equity-based compensation at a level sufficient to drive an appropriate amount of focus on the long-term performance of the Company. The compensation program for all executive officers and key management employees, including the named executive officers, includes the following elements:

•

Base Salary



•

Performance-Based Incentive Plans



•

Stock Option Plans



•

Insurance Benefits



•

Retirement Benefits

        Base Salary.     The Company establishes base salary to provide fixed income at approximately the median level for executives of comparable companies with similar responsibilities. Several elements are considered in setting base salary, including the size, scope and complexity of the executive officer's or key management employee's responsibilities. Position, geography and economic and market conditions are also considered, particularly with respect to retention. Base salary must be reasonable, fair and competitive. The Committee also considers the historical, current and forecasted performance of the Company and individual operating units, and the contributions or expected contributions of each executive officer or key management employee to those results when considering proposed adjustments to base salary. Salary levels for all executive officers and key management employees are reviewed and typically adjusted annually. Salary levels are also typically reviewed and may be adjusted in connection with a change in job responsibilities.

        Performance-Based Incentive Plans.     Executive officers and key management employees, including the named executive officers (with the exception of key sales and marketing employees who typically have their own sales incentive or commission plans and from time-to-time certain key employees of newly acquired companies who had or have their own incentive plans), were eligible to receive payments pursuant to The 2017 Management Incentive Plan (the "2017 Management Incentive Plan"). The 2017 Management Incentive Plan is an executive bonus plan designed to fall within the parameters of The 2014 Amphenol Executive Incentive Plan (the "2014 Executive Incentive Plan") approved by the stockholders at the 2014 Annual Meeting of Stockholders. The Committee has reviewed and approved the 2018 Management Incentive Plan (the "2018 Management Incentive Plan") with terms that are substantially the same as the 2017 Management Incentive Plan. The 2018 Management Incentive Plan, the 2017 Management Incentive Plan, and the 2014 Executive Incentive Plan, are collectively hereinafter referred to as the "incentive plan". Target payments under the incentive plan when added to fixed base salary are intended to generate total annual cash compensation for participating Company employees that the Company believes is reasonable, fair and competitive with annual cash compensation paid to similarly situated employees in comparable positions at other companies with comparable performance.

        Incentive plan payments, when made, have historically totaled in the aggregate less than 2% of the annual consolidated operating income for the Company. There were approximately 425 participants in the 2017 Management Incentive Plan. Approximately 365 participants were paid approximately $20.3 million

27

---

Table of Contents

representing approximately 1.4% of the Company's consolidated operating income for 2017. Approximately 60 participants received no incentive plan payment for 2017 performance. There are currently approximately 440 participants in the 2018 Management Incentive Plan who, at achievement of 100% of 2018 performance targets and goals, would be paid an aggregate of approximately $17.5 million.

        The incentive plan provides participants with a cash bonus opportunity if certain individual, operating unit and/or Company goals are achieved. A "responsibility unit" in the discussion below refers to the group or business unit for which the employee has management responsibility or to which he or she is assigned. For executive officers and key management employees with global headquarters roles (i.e., Company-wide responsibilities), such as Messrs. Norwitt, Lampo and D'Amico, the Company is considered the responsibility unit. For Messrs. Doherty and Walter, the group over which each served as Group General Manager in 2017 is considered the responsibility unit.

        The incentive plan is intended to reward participants upon the achievement of the goals for their respective responsibility unit, with discretion for qualitative individual, operating unit and Company performance factors. No annual incentive payments will be made if a threshold performance level is not achieved, absent the occurrence of extenuating circumstances that, in the discretion of the Committee, merit an exception to the threshold performance requirement. As a general rule, the threshold performance requirement for consideration of any incentive plan payment for employees with Company-wide responsibilities is year-over-year growth in Company EPS and for other employees is year-over-year growth in the operating income of their respective responsibility units.

        Incentive plan payment amounts are calculated by multiplying three factors together: (i) a participant's annual base salary, (ii) a participant's incentive plan target percentage and (iii) a participant's incentive plan multiplier.

        Incentive plan target percentages for each participant are established at the beginning of each year, occasionally subject to adjustment mid-year. Incentive plan target percentages for participants in the 2017 Management Incentive Plan ranged from 5% to 125% of annual base salary.

        The incentive plan multiplier is determined for each participant after the end of each year by analyzing a number of quantitative factors, subject to qualitative adjustment, as discussed in more detail below. The maximum incentive plan multiplier any recipient may be awarded is 200%. The incentive plan does not guarantee any minimum incentive plan multiplier to any participant. For 2017, participants received incentive plan multipliers ranging from 0% to 200%.

        A participant's incentive plan multiplier is based primarily on responsibility unit performance against quantitative measures established at the beginning of each year. In addition, consideration is given, when appropriate, to certain qualitative factors to pass the test of reasonableness and consistency. The quantitative portion of the incentive plan multiplier is contingent upon the Company's achievement and/or the applicable responsibility unit's achievement of performance targets and/or goals. These targets and/or goals may vary from year to year and may include revenue growth, operating income growth, operating cash flow, return on investment, return on sales, organic growth and/or contribution to EPS growth. Actual performance against these criteria is measured against both year-over-year growth and/or the current year target.

        The Company continues to believe that the key drivers to generating stockholder value are revenue growth, operating income growth and EPS growth. In 2017 the quantitative performance criteria for (i) participants with Company-wide responsibilities was based on Company revenue and Adjusted Diluted EPS growth in 2017 over 2016 and (ii) other participants was primarily based on responsibility unit revenue and operating income growth in 2017 over 2016 and actual performance in 2017 as compared to 2017 budget. Revenue growth and operating income growth are calculated in local currency for executive officers and key management employees with responsibility units outside the United States.

28

---

Table of Contents

        The specific targets to be achieved by Messrs. Norwitt, Lampo and D'Amico to attain a 100% quantitative portion of the incentive plan multiplier under the incentive plan in 2017 were (i) Company revenue growth of at least 7%, and (ii) Company Adjusted Diluted EPS growth of at least 11%. To achieve a 200% quantitative portion of the incentive plan multiplier under the incentive plan in 2017 would have required Company revenue growth and Company Adjusted Diluted EPS growth of at least two and one half times the levels required for a 100% quantitative portion of the incentive plan multiplier. In calculating the incentive plan multiplier, Company Adjusted Diluted EPS growth and Company revenue growth are given equal weighting. The specific targets to be achieved by Messrs. Doherty and Walter to attain a 100% incentive plan multiplier under the 2017 incentive plan were (i) responsibility unit revenue growth of at least 7% and (ii) responsibility unit operating income growth of at least 11%.

        In addition, for executives that do not have global headquarters roles, such as Messrs. Doherty and Walter, the incentive plan multiplier is adjusted up or down based on responsibility unit achievement to responsibility unit budget. To achieve a 200% quantitative portion of the incentive plan multiplier under the incentive plan in 2017 required responsibility unit revenue growth and responsibility unit operating income growth of at least two and one half times the levels required for a 100% quantitative portion of the incentive plan multiplier. In calculating the incentive plan multiplier, responsibility unit operating income growth and responsibility unit revenue growth are given equal weighting. If there is no operating income growth or Adjusted Diluted EPS growth, as applicable, the impact to the incentive plan multiplier is at the discretion of the Committee, but generally has resulted in an incentive plan multiplier of 0%. For purposes of making all calculations for incentive plan purposes using these ranges, responsibility unit operating income is adjusted for other expenses recorded below operating income and for certain amortization expense.

        Once the quantitative portion of the incentive plan multiplier is established, management and/or the Committee, as applicable, consider various qualitative factors and may adjust the incentive plan multiplier accordingly. The qualitative analysis is designed to ensure that a participant is rewarded for responsibility unit performance and individual performance, but also to provide a means to ensure the awards are fair and meet the other goals of the Committee in determining executive compensation. In 2017, the aggregate qualitative adjustment with respect to all participants in the incentive plan was an increase of approximately 4.8% of the total amount calculated pursuant to the quantitative measures. There was no qualitative adjustment with respect to Messrs. Norwitt, Lampo and D'Amico as each earned the same incentive multiplier as other headquarters employees.

        In 2018 there is no change in the quantitative performance criteria for the 2018 Management Incentive Plan as compared to the 2017 Management Incentive Plan.

        Stock Option Plans.     Granting stock options serves to maintain the alignment of the interests of the Company's executive officers and key management employees with its stockholders and allows executive officers and key management employees to participate in the long-term growth and profitability of the Company. The Committee believes that granting stock options helps create competitive levels of compensation and provides an opportunity for increased equity ownership by executive officers and key management employees (including the named executive officers). All currently outstanding employee stock option grants have a five-year vesting period, with 20% vesting each year. The Committee believes this extended vesting schedule helps retain executive officers and key management employees and encourages them to make decisions geared towards long-term growth. Assuming the minimum service requirements have been satisfied, vesting would be immediately accelerated upon death, or under certain circumstances, disability (as defined in the plans). The Committee has discretion to allow continued vesting of unvested options following termination of employment due to retirement at age 65 or older with at least five years of employment with the Company or following termination of employment due to retirement at age 55 or older with at least ten years of employment with the Company. With respect to anyone who is not a direct report of the Chief Executive Officer, the discretion to continue vesting has been delegated to the Chief Executive Officer. Vesting stops under most other termination situations. The potential for

29

---

Table of Contents

continued vesting incentivizes the executives to look after the long-term health of the Company. The total expense for options granted each year is typically in the range of approximately 4% to 5% of the Company's annual budgeted consolidated operating income for such year.

        The employee stock option plan is administered by the Committee. The Committee will consider recommendations of the Chief Executive Officer and other senior management employees of the Company and determine those employees of Amphenol and its subsidiaries who will be eligible to receive options, the number and the terms and conditions of each option grant, the form of the option agreement and any conditions on the exercise of an option award.

        The Committee has authorized the Company to issue stock options to executive officers and other key employees pursuant to approved stock options plans. In determining the number of options to be granted to an individual employee, a value is imputed for each option, with reference to the Company's then current stock price and the estimated Black-Scholes valuation for option grants. The Committee also considers information regarding the total amount of options available, an individual's base salary, the amount of stock options, if any, previously awarded to an individual, an individual's past and expected future contributions to the Company's financial performance and an individual's responsibilities for assisting the Company in achieving its long-term strategic goals.

        The Committee has historically made annual awards of stock options in the second quarter of each year. Newly hired or promoted executive officers or key management employees have on occasion received an award of stock options at or near the date of appointment. The Committee does not grant stock options with an exercise price that is less than the closing price of the Common Stock on the grant date.

        All stock option recipients must enter into a Stock Option Agreement and a Management Stockholder's Agreement with the Company which set forth the terms and conditions and limitations applicable to any shares purchased pursuant to options granted.

        Insurance Benefits.     Each executive officer and key management employee (including the named executive officers) is offered the same health and life insurance benefits as other employees working at the same location. The Company also makes a contribution to group term life insurance on behalf of substantially all U.S.-based salaried employees (including the named executive officers) on the same terms and conditions as similarly situated U.S. based salaried employees for which the Company is required to impute compensation for amounts in excess of $50,000 net of employee payments, see table of All Other Compensation under footnote (4) on page 38. Key management employees outside of the U.S. participate in the same insurance programs on the same terms and conditions as similarly situated salaried employees.

        Retirement Benefits.     U.S.-based salaried employees (including the named executive officers) may participate in the Company's Pension Plan, Supplemental Employee Retirement Plan, or SERP, a non-qualified supplemental defined contribution program, or DC SERP, and in the Company's 401(k) programs on the same terms and conditions as similarly situated U.S.-based salaried employees. For more information on the Pension Plan, the SERP, the DC SERP and 401(k) programs, and each named executive officer's participation, see the section entitled Pensions and Deferred Compensation beginning on page 42. As certain of the retirement programs are unfunded, i.e. the SERP and the DC SERP, the Company's executives are incentivized to look after the long-term health of the Company. Key management employees outside of the U.S. participate in the same retirement programs on the same terms and conditions as similarly situated salaried employees.

        Perquisites/Other.     Mr. Norwitt was provided with car and driver services in 2017. Mr. Norwitt continues to receive car and driver services in 2018. In connection with his joining the Company as General Counsel in August 2016, Mr. D'Amico was paid a one-time sign-on bonus in 2017 and the Company paid for various expenses related to his relocation from California to Connecticut where the Company is headquartered.

30

---

Table of Contents

Compensation of Named Executive Officers

        Company Performance —When reviewing compensation, the Committee reviewed the Company's 2017 financial results. The Company's 2017 financial results have been prepared in conformity with GAAP, and reported in the consolidated financial statements included in the Company's 2017 Annual Report on Form 10-K. In addition to reviewing relevant GAAP financial measures, the Committee considered non-GAAP measures which it believes are also relevant in gauging year-over-year performance. Thus, Adjusted Operating Income, Adjusted Diluted EPS and Adjusted Operating Margins were considered by the Committee.¹ In 2017, Company revenue increased over 2016 levels by 12%, Adjusted Diluted EPS increased over 2016 levels by 15%, and Adjusted Operating Margins reached 20.4%, up from the 19.8% Adjusted Operating Margins achieved in 2016.

        Pay Mix —Compensation programs for the named executive officers emphasize at-risk, performance-based elements geared to encourage management to generate stockholder value, namely stock options and incentive plan compensation linked to goals that encourage growth in revenue, operating income and/or EPS. Fixed compensation elements, such as base salary, retirement benefits and other compensation are designed to be market competitive for purposes of retention, and to a lesser extent, recruitment.

   

---

        (1) Explanation of Non-GAAP Financial Measures.    In addition to assessing the Company's financial condition, results of operations, liquidity and cash flows in accordance with GAAP, management and the Committee utilize certain non-GAAP financial measures defined below when assessing employee compensation measures. Management and the Committee believe that these non-GAAP financial measures are helpful in assessing the Company's overall financial performance, trends and year-over-year comparative results, in addition to the reasons noted below. Non-GAAP financial measures related to operating income, operating margin, net income attributable to Amphenol Corporation and diluted EPS exclude income and expenses that are not directly related to the Company's operating performance during the applicable time period. Items excluded in such non-GAAP financial measures in any period may consist of, without limitation, acquisition-related expenses, refinancing-related costs, and certain discrete tax items including but not limited to (i) the impact of the Tax Cuts and Jobs Act enacted on December 22, 2017 (the "Tax Act") and (ii) the excess tax benefits related to stock-based compensation that may arise during such periods due to the Tax Act's reduction of a substantial portion of such future tax benefits.

        The non-GAAP financial measures should be read in conjunction with the Company's financial statements presented in accordance with GAAP. See Item 7—Management's Discussion and Analysis of Financial Condition and Results of Operations to the Company's 2017 Annual Report on Form 10-K for further details.

•

Adjusted Diluted EPS is defined as diluted earnings per share (as reported in accordance with GAAP), excluding income and expenses and their specific tax effects, that are not directly related to the Company's operating performance during the years presented. Adjusted Diluted EPS is calculated as Adjusted Net Income attributable to Amphenol Corporation, as defined below, divided by the weighted average outstanding diluted shares as reported in the Company's Consolidated Statements of Income.



•

Adjusted Net Income attributable to Amphenol Corporation is defined as Net income attributable to Amphenol Corporation, as reported in the Consolidated Statements of Income, excluding income and expenses and their specific tax effects that are not directly related to the Company's operating performance during the applicable time period.



•

Adjusted Operating Income is defined as Operating income, as reported in the Consolidated Statements of Income, excluding income and expenses that are not directly related to the Company's operating performance during the applicable time period.



•

Adjusted Operating Margin is defined as Adjusted Operating Income (as defined above) expressed as a percentage of Net sales (as reported in the Consolidated Statements of Income).

31

---

Table of Contents

        For the Company's Chief Executive Officer, fixed compensation elements including salary, change in pension value and "all other compensation" comprised approximately 15% of his total 2017 compensation. His at-risk compensation linked to increasing stockholder value comprised approximately 85% of his total 2017 compensation. These at-risk elements include stock options granted with an exercise price equal to the closing price of the Company's Common Stock on the date of grant which only generate value if the Company's share price increases after the grant date. The value ascribed to the options for purposes of calculating percentages in this paragraph is the grant date fair value calculated in accordance with ASC Topic 718, as further described in footnote (1) to the Summary Compensation Table on page 37. The other at-risk compensation is incentive-plan compensation which historically has required year-over-year EPS growth before any amount is paid in addition to other considerations designed to motivate the Chief Executive Officer to generate stockholder value, and rewards the Chief Executive Officer when Company revenues and EPS grow. For the Company's other named executive officers as a group, fixed compensation elements comprised approximately 25% of total 2017 compensation while at-risk compensation comprised approximately 75% of total 2017 compensation. As with the Chief Executive Officer, the fixed compensation elements for the other named executive officers include salary, retirement benefits and "all other compensation", while the at-risk items include stock options and incentive plan compensation linked to goals that encourage growth in revenues and either EPS or operating income, depending on the role of the named executive officer. In addition to the standard elements of compensation, Mr. D'Amico was paid a one-time sign-on bonus in 2017 in connection with joining the Company which was not considered for purposes of this calculation.

        CEO Compensation —Mr. Norwitt's annual base salary at the beginning of 2018 was increased by approximately 3% from $1,093,000 to $1,130,000. Mr. Norwitt's incentive plan target percentage pursuant to the 2018 Management Incentive Plan remains at 125%. In its deliberations about whether and how to adjust these two elements of Mr. Norwitt's compensation, the Committee considered the Company's revenue, operating income, headcount, number of facilities, as well as the complexity of the Company's business. The Committee also considered the annual base salary and target bonus percentages of chief executive officers of similarly-sized companies in the electronics industry. The Committee determined that it was appropriate to increase Mr. Norwitt's annual base salary by approximately 3%, from $1,093,000 to $1,130,000, in line with the average inflationary increase generally given to other salaried employees of the Company in the United States, while continuing to emphasize performance-based compensation. His actual potential 2018 Management Incentive Plan payment will range from 0% to 250% of his base salary.

        Consistent with the methodology for calculating incentive plan payments described in the section entitled Performance-Based Incentive Plans above, the calculation of the incentive plan payment for Mr. Norwitt is the product of his 2017 base compensation, multiplied by his incentive plan target percentage and his incentive plan multiplier. In 2017, the Company achieved revenue growth of 12% and Adjusted Diluted EPS growth of 15%.

        Based on calculations made using the ranges provided above, the quantitative portion of Mr. Norwitt's incentive plan multiplier in 2017 was calculated to be 130%, the same percentage calculated for all named executive officers with global headquarters roles. His incentive plan payment pursuant to the 2017 Management Incentive Plan was $1,776,125, representing a product of his 2017 base salary of $1,093,000 multiplied by his incentive plan target percentage of 125%, multiplied by the global headquarters incentive plan multiplier of 130%. This was approximately 163% of his 2017 base salary as compared to a maximum possible payout under the 2017 Management Incentive Plan of 250% of his 2017 base salary.

        In May 2017, Mr. Norwitt was awarded 585,000 options pursuant to the 2017 Option Plan with an exercise price of $72.90. The option award reflects the Board's confidence in his leadership. The award is also designed to further align Mr. Norwitt's interest with the Company's stockholders to generate long-term stockholder value.

32

---

Table of Contents

        In 2017, Mr. Norwitt was provided with car and driver services. These services allow him to work more efficiently and facilitate his ability to communicate with the Company's global organization. The Company expenses associated with this car and driver were $20,283. The imputed value of compensation for group term life insurance provided to Mr. Norwitt in 2017 in excess of $50,000, net of employee payments, was $3,510. The Company continues to provide Mr. Norwitt with car and driver services and to contribute to his group term life insurance in 2018.

        Mr. Norwitt continues to participate in the Pension Plan (further described in the section entitled Pension Plan Background commencing on page 42), but his benefits under such Pension Plan have been frozen. Notwithstanding that Mr. Norwitt's Pension Plan benefits have been frozen, there was a change in his pension value because of changes in actuarial assumptions in 2017 as compared to 2016. In 2017, Mr. Norwitt received a 401(k) match of $13,500. The Company made notational contributions to a non-qualified supplemental defined contribution plan, or DC SERP, on behalf of Mr. Norwitt for 2017 of $111,176. Mr. Norwitt continues to participate in the 401(k) Plan and the DC SERP in 2018.

        Other Named Executive Officers' Compensation.     For each of the other named executive officers, in determining incentive plan payments and stock option awards for 2017, and base salary and incentive plan target adjustments for 2018, the Committee considered each executive's overall performance. In the case of Messrs. Lampo and D'Amico, the Committee evaluated the overall performance of the Company and each of their respective contributions to that performance. In the case of Messrs. Doherty and Walter, the Committee evaluated their contributions to the performance and results of the group over which each served as Group General Manager.

        Mr. Lampo.     In January 2018, Mr. Lampo's annual base salary was increased by approximately 10% from $475,000 to $525,000. This increase reflects his ongoing development in the Chief Financial Officer role he assumed in July 2015.

        Consistent with the methodology for calculating incentive plan payments described in Performance-Based Incentive Plans above, the calculation of the incentive plan payment for Mr. Lampo is the product of his 2017 base compensation, multiplied by his incentive plan target percentage and his incentive plan multiplier. In 2017, the Company achieved revenue growth of 12% and Adjusted Diluted EPS growth of 15%.

        Based on calculations made using the ranges provided above, the quantitative portion of Mr. Lampo's incentive plan multiplier in 2017 was calculated to be 130%, the same percentage calculated for all named executive officers with global headquarters roles. His incentive plan payment pursuant to the 2017 Management Incentive Plan was $370,500, representing a product of his 2017 base salary of $475,000 multiplied by his incentive plan target percentage of 60%, multiplied by the global headquarters incentive plan multiplier of 130%. This was approximately 78% of his 2017 base salary as compared to a maximum possible payout under the 2017 Management Incentive Plan of 120% of his 2017 base salary.

        Mr. Lampo's incentive plan target percentage pursuant to the 2018 Management Incentive Plan has been increased from 60% to 65% of his base salary in 2018 to further emphasize performance-based compensation. His potential 2018 Management Incentive Plan payment will range from 0% to 130% of his base salary.

        In May 2017, Mr. Lampo was awarded 200,000 options pursuant to the 2017 Option Plan with an exercise price of $72.90.

        The imputed value of compensation for group term life insurance provided to Mr. Lampo in 2017 in excess of $50,000, net of employee payments, was $1,616. In 2018, the Company continues to contribute to Mr. Lampo's group term life insurance. Mr. Lampo continues to participate in the Pension Plan, but his benefits under such Pension Plan have been frozen as described in the section entitled Pension Plan Background commencing on page 42. Notwithstanding that Mr. Lampo's pension plan benefits have been frozen, there was a change in his pension value because of changes in actuarial assumptions in 2017 as

33

---

Table of Contents

compared to 2016. In 2017, Mr. Lampo received a 401(k) match of $13,500. The Company made notational contributions to the DC SERP on behalf of Mr. Lampo for 2017 of $23,750. He also continues to participate in the 401(k) plan and the DC SERP in 2018.

        Mr. D'Amico.     In January 2018, Mr. D'Amico's annual base salary was increased by approximately 4% from $463,500 to $480,000. This increase reflects his ongoing development in the General Counsel role he assumed in August 2016 with consideration to the annual salary rate increase he received as of August 2017 from $450,000 to $463,500.

        Consistent with the methodology for calculating incentive plan payments described in "Performance-Based Incentive Plans" above, the calculation of the incentive plan payment for Mr. D'Amico is the product of his 2017 base compensation, multiplied by his incentive plan target percentage and his incentive plan multiplier. In 2017, the Company achieved revenue growth of 12% and Adjusted Diluted EPS growth of 15%.

        Based on calculations made using the ranges provided above, the quantitative portion of Mr. D'Amico's incentive plan multiplier in 2017 was calculated to be 130%, the same percentage calculated for all named executive officers with global headquarters roles. His incentive plan payment pursuant to the 2017 Management Incentive Plan was $296,156, representing a product of his 2017 base salary of $455,625 multiplied by his incentive plan target percentage of 50%, multiplied by the global headquarters incentive plan multiplier of 130%. This was approximately 65% of his 2017 base salary as compared to a maximum possible payout under the 2017 Management Incentive Plan of 100% of his 2017 base salary.

        Mr. D'Amico's incentive plan target percentage pursuant to the 2018 Management Incentive Plan has been increased from 50% to 55% of his base salary in 2018 to further emphasize performance-based compensation. His potential 2018 Management Incentive Plan payment will range from 0% to 110% of his base salary.

        In May 2017, Mr. D'Amico was awarded 120,000 options pursuant to the 2017 Option Plan with an exercise price of $72.90. In connection with his joining the Company as General Counsel in August 2016, in 2017 Mr. D'Amico was paid a one-time sign-on bonus of $100,000 and the company paid for various expenses of $189,957 related to his relocation from California to Connecticut where the Company is headquartered.

        The imputed value of compensation for group term life insurance provided to Mr. D'Amico in 2017 in excess of $50,000, net of employee payments, was $1,546. In 2018, the Company continues to contribute to Mr. D'Amico's group term life insurance. Mr. D'Amico does not participate in any Company pension plan. In 2017, Mr. D'Amico received a 401(k) match of $12,200. The Company made notational contributions to the DC SERP on behalf of Mr. D'Amico for 2017 of $19,906. He also continues to participate in the 401(k) plan and the DC SERP in 2018.

        Mr. Doherty.     In January 2018, Mr. Doherty's annual base salary was increased by approximately 12% from $425,000 to $475,000, to reflect the expanded scope of his responsibilities as he took on the leadership of the newly formed Information, Communications and Commercial Products Group.

        Based on calculations made using the ranges provided above, the quantitative and qualitative portion of Mr. Doherty's incentive plan multiplier in 2017 was calculated to be 175%. His incentive plan payment pursuant to the 2017 Management Incentive Plan was $446,250, representing the product of his 2017 base salary of $425,000 multiplied by his incentive plan target percentage of 60%, multiplied by his incentive plan multiplier of 175%. This was approximately 105% of his 2017 base salary, as compared to a maxiumum possible payout under the 2017 Management Incentive Plan of 120% of his base salary.

        Mr. Doherty's incentive plan target percentage pursuant to the 2018 Management Incentive Plan has been increased from 60% to 65% of his base salary in 2018 to further emphasize performance-based

34

---

Table of Contents

compensation. His potential 2018 Management Incentive Plan payment will range from 0% to 130% of his base salary. This variable, at-risk compensation is designed to incentivize performance in line with the core goal of increasing revenue and operating income growth within Mr. Doherty's group.

        In May 2017, Mr. Doherty was awarded 146,000 options pursuant to the 2017 Option Plan with an exercise price of $72.90.

        The imputed value of compensation for group term life insurance provided to Mr. Doherty in 2017 in excess of $50,000, net of employee payments, was $2,197. In 2018, the Company continues to contribute to Mr. Doherty's group term life insurance. Mr. Doherty does not participate in any Company pension plan. In 2017, Mr. Doherty received a 401(k) match of $13,458. The Company made notational contributions to the DC SERP on behalf of Mr. Doherty for 2017 of $23,688. He also continues to participate in the Amphenol (TCS) 401(k) Plan and the DC SERP in 2018.

        Mr. Walter.     In January 2018, Mr. Walter's annual base salary was increased by approximately 3%, from $580,000 to $600,000, in line with the average inflationary increase generally given to other salaried employees of the Company in the United States.

        Based on calculations made using the ranges provided above, the quantitative and qualitative portion of Mr. Walter's incentive plan multiplier in 2017 was calculated to be 160%. His incentive plan payment pursuant to the 2017 Management Incentive Plan was $603,200, representing the product of his 2017 base salary of $580,000 multiplied by his incentive plan target percentage of 65%, multiplied by his incentive plan multiplier of 160%. This was approximately 104% of his 2017 base salary, as compared to a maximum possible payout under the 2017 Management Incentive Plan of 130% of his 2017 base salary.

        Mr. Walter's incentive plan target percentage pursuant to the 2018 Management Incentive Plan remains at 65% of his base salary in 2018. His potential 2018 Management Incentive Plan payment could therefore range from 0% to 130% of his base salary. This variable, at-risk compensation is designed to incentivize performance in line with the core goal of increasing revenue and operating income growth within Mr. Walter's group.

        In May 2017, Mr. Walter was awarded 146,000 options pursuant to the 2017 Option Plan with an exercise price of $72.90.

        The imputed value of compensation for group term life insurance provided to Mr. Walter in 2017 in excess of $50,000, net of employee benefits, was $5,728. In 2018, the Company continues to contribute to Mr. Walter's group term life insurance. Mr. Walter continues to participate in the Pension Plan but his benefits under such plan have been frozen as described in the section entitled Pension Plan Background commencing on page 42. Notwithstanding that Mr. Walter's Pension Plan benefits have been frozen, there was a change in pension value because of changes in actuarial assumptions in 2017 as compared to 2016. In 2017, Mr. Walter received a 401(k) match of $13,500. The Company made notational contributions to the DC SERP on behalf of Mr. Walter for 2017 of $33,700. Mr. Walter continues to participate in the 401(k) plan and the DC SERP in 2018.

35

---

Table of Contents

COMPENSATION COMMITTEE REPORT

        The Compensation Committee consists of three directors who are independent directors as defined under the NYSE Listing Standards and the Company's Governance Principles. The Compensation Committee has undertaken a review of its Charter, practices and procedures. A copy of the current Compensation Committee Charter is available on the Company's website at www.amphenol.com by clicking on "Investors", then "Corporate Governance", then "Governance Documents", and then "Compensation Committee Charter".

        The Compensation Committee reports that it has reviewed and discussed the Compensation Discussion & Analysis with management. Based on this review and discussion, the Compensation Committee has recommended to the Company's Board of Directors that the Compensation Discussion & Analysis be included in this 2018 Proxy Statement.

Compensation Committee Interlocks and Insider Participation

        Messrs. Clark, Falck and Lord serve on the Compensation Committee. None of Messrs. Clark, Falck or Lord is or formerly was an employee or officer of the Company. Mr. Norwitt and Ms. Reardon are the only Board members who were also employees of the Company during 2017. Mr. Norwitt and Ms. Reardon do not serve on the board of directors of any other company (other than non-public subsidiaries of the Company).

36

---

Table of Contents

SUMMARY COMPENSATION TABLE

        The following table summarizes the total compensation provided by the Company to the named executive officers for 2015, 2016 and 2017, except in the case of Messrs. D'Amico and Doherty who were not named executive officers prior to 2017. When setting total compensation for each of the named executive officers, the Compensation Committee considers total current compensation, including equity and non-equity based compensation, for all executive officers of the Company, including the named executive officers.

37

---

Table of Contents

Section 162(m) of the Internal Revenue Code

        The Tax Act was signed into law December 22, 2017. Prior to the Tax Act, Section 162(m) of the Internal Revenue Code generally limited the U.S. federal income tax deductibility of compensation in excess of $1 million paid in one year to a corporation's Chief Executive Officer and certain other executive officers. Compensation that qualified as "performance-based" under Section 162(m) of the Internal Revenue Code was exempt from this $1 million limitation. As part of the Tax Act, the ability to rely on this "qualified performance-based compensation" exception was eliminated, and the limitation on deductibility was generally expanded to include all named executive officers. Although we maintain compensation arrangements that were intended to qualify as performance-based compensation under Section 162(m) of the Internal Revenue Code prior to the Tax Act, subject to certain transition relief rules, we may no longer take a deduction for any compensation paid to our covered employees in excess of $1 million. Furthermore, although the Compensation Committee may have taken action intended to limit the impact of Section 162(m) of the Internal Revenue Code, it also believes that the tax deduction is only one of several relevant considerations in setting compensation. Accordingly, the Company does not intend to change its performance-based compensation methodologies.

Employment Agreements

        In conjunction with accepting each stock option award, all option award recipients, including each of the named executive officers, becomes party to a management stockholder's agreement with the Company which contemplates, among other things, that a terminated employee may be paid, at the Company's discretion, fifty percent of base salary in the form of salary continuation following his/her termination for up to two years, in exchange for a firm undertaking from the terminated employee not to compete with the business of the Company.

38

---

Table of Contents

        Pursuant to an employment letter agreement with the Company dated March 22, 1999, the Company has agreed that if Mr. Walter is terminated by the Company without cause, the Company is obligated to (i) pay him lump sum severance equal to 100% of the base compensation he received in the twelve-month period preceding his termination and (ii) relocate him to France if he so chooses.

        Except as set forth above, none of the named executive officers are parties to any employment agreements with the Company.

Stock Option Plans

        In May 2017, stockholders approved and the Company adopted the 2017 Stock Option Plan. While options remain outstanding under the 2000 Stock Purchase and Option Plan for Key Employees of Amphenol and Subsidiaries, as amended, (the "2000 Option Plan") and the 2009 Stock Purchase and Option Plan for Key Employees of Amphenol and Subsidiaries, as amended (the "2009 Option Plan"), no further options will be granted under the 2000 Option Plan or the 2009 Option Plan. The 2000 Option Plan, the 2009 Option Plan and the 2017 Option Plan are collectively referred to herein as the "Company's Option Plans". The Company's Option Plans provide for the granting of an option to purchase shares not intended or not qualifying as an incentive stock option as defined in Section 422 of the Internal Revenue Code.

        No options can be granted at less than the fair market value of the Company's Common Stock on the date of the grant. The Company is not able to grant any further restricted stock awards, stock appreciation rights, dividend equivalent rights, performance units, performance shares or any other stock-based grants other than non-qualified options under the Company's Option Plans, and stockholder approval is required for any material amendments. Option awards vest in equal annual installments over a five-year period and have a ten-year term. In the event of a death or disability (as defined in the plans), assuming the minimum service requirements have been satisfied, a participant will immediately vest in all outstanding options. The Committee has discretion to allow continued vesting of unvested options following termination of employment due to retirement at age 65 or older with at least five years of employment with the Company or following termination of employment due to retirement at age 55 or older with at least ten years of employment with the Company. Vesting stops under most other termination situations.

        A total of 6,886,600 options were granted under the 2017 Option Plan in May 2017 at an exercise price of $72.90 to 640 employees of the Company including the named executive officers. An aggregate of 143,000 options at exercise prices ranging from $76.62 to $77.98 were also granted under the 2017 Option Plan at other times in 2017 to other employees. The 2017 Option Plan limits the number of options that may be granted to any one participant in any fiscal year to not more than 1,500,000 options, which may be doubled during the first fiscal year a participant commences employment with the Company and/or its subsidiaries.

        Of the 30,000,000 shares of Common Stock reserved for issuance pursuant to the 2017 Option Plan, 23,016,700 shares are available for future option grants as of April 2, 2018.

        The exercise prices of the 25,469,875 options outstanding as of April 2, 2018 under the 2009 Option Plan range from $16.01 to $64.86. The exercise price of the 74,400 options outstanding as of April 2, 2018 under the 2000 Option Plan is $22.98. On April 2, 2018, the market value per share of Common Stock was $84.05 (determined by reference to the closing price listed on the New York Stock Exchange, Inc. Composite Tape.)

Repricing of Options/Granting of SARs

        During the last fiscal year, the Company did not reprice any options nor did it grant any SARs. The Company's Option Plans do not provide for the granting of SARs or any other stock-based grants.

39

---

Table of Contents

GRANTS OF PLAN BASED AWARDS IN FISCAL YEAR 2017

40

---

Table of Contents

OUTSTANDING EQUITY AWARDS AT 2017 FISCAL YEAR END

41

---

Table of Contents

OPTION EXERCISES AND STOCK VESTED FOR THE 2017 FISCAL YEAR

PENSIONS AND DEFERRED COMPENSATION

Pension Plan

        Pension Plan Background.     Certain employees of the Company and its U.S. subsidiaries are eligible to participate in the Pension Plan for Employees of Amphenol Corporation, referred to as the Pension Plan, which is a defined benefit pension plan. Benefits are calculated based on the section of the Pension Plan in which an employee participates. The Company also sponsors a supplemental employee retirement plan (the "SERP") which provides for the payment of the portion of an annual pension which cannot be paid from the Pension Plan as a result of limitations contained in the Internal Revenue Code of 1986, as amended (the "Internal Revenue Code").

        In 2006, the Company amended the Pension Plan by freezing accruals effective December 31, 2006 for personnel with less extensive service (referred to as the "non-grandfathered participants"). In connection with the freezing of accruals under the Pension Plan, beginning in 2007, the Company implemented employer contributions to the Amphenol 401(k) Plan and to a related non-qualified supplemental defined contribution plan for non-grandfathered participants. Grandfathered participants will continue to accrue incremental benefits under the Pension Plan and the SERP and will continue to be eligible to participate in the Amphenol 401(k) plan with no employer contributions.

        Messrs. D'Amico and Doherty do not participate in the Pension Plan or the SERP. The other named executive officers, as well as Ms. Reardon, participate in the Pension Plan and the SERP as non-grandfathered participants. Non-employee directors do not participate in the Pension Plan, although Messrs. Loeffler and Jepsen participated in the Pension Plan and the SERP during their prior employment with the Company.

        General Provisions of the Pension Plan.     The normal retirement date under the Pension Plan is the first day of the month following a participant's 65^th birthday. A participant may also retire as of the first day of any month subsequent to the participant's 55^th birthday and completion of either five or ten years of service, however, a participant's normal retirement benefit is reduced by as much as 50% if payment of retirement benefits commences upon early retirement. Retirement benefits are paid in the form of a life annuity (generally a reduced joint and survivor annuity for married participants). The Company has a policy that prohibits granting extra years of credited service under the Pension Plan.

        For the section of the Pension Plan in which Mr. Norwitt participated, the annual normal retirement benefit is equal to the greater of: (i) 1.1% of the participant's final average pensionable compensation multiplied by the participant's years of credited service or (ii) 1.8% of the participant's final average pensionable compensation multiplied by the participant's years of credited service not in excess of 25 (1% for years in excess of 25) reduced by 2% of the participant's estimated annual social security benefit multiplied by the participant's years of credited service not in excess of 30. Average pensionable compensation is equal to the participant's average annual total compensation, excluding bonuses and incentive plan payments, during the three years prior to the Pension Plan being frozen.

42

---

Table of Contents

        For the section of the Pension Plan in which Messrs. Lampo and Walter participated, the annual normal retirement is equal to 2% of the participant's final average pensionable compensation multiplied by the participant's years of credited service not in excess of 25 less 2% of the participant's estimated annual social security benefit multiplied by the participant's years of credited service not in excess of 25. Average pensionable compensation is equal to the participant's average annual compensation, including bonuses and incentive payments, during the five years immediately prior to the Pension Plan being frozen.

        Mr. Walter's Retirement Benefit Assuming He Elects Early Retirement.     Mr. Walter meets the age and service requirements for early retirement under his section of the Pension Plan. If Mr. Walter were to have elected early retirement as of December 31, 2017, he could have elected to receive his accrued benefit starting at age 65 or a reduced benefit commencing as of his retirement date. The reduced benefit would be equal to the benefit that would otherwise be payable at his normal retirement date ($2,449 per month payable from the Pension Plan and $2,788 per month payable from the SERP), reduced by 1/180^th for each of the first 60 months and by 1/360^th for each of the months more than 60 by which Mr. Walter's hypothetical early retirement date precedes his normal retirement date (i.e. 65 months). Using this formula, Mr. Walter's early retirement benefit, if he had elected early retirement as of December 31, 2017, would have been $1,599 per month payable from the Pension Plan and $1,820 per month payable from the SERP.

Pension Benefits for the 2017 Fiscal Year

43

---

Table of Contents

        Pension Plan and 401(k) Plan.     Beginning on January 1, 2007, non-grandfathered participants in the Pension Plan, including Messrs. Norwitt, Lampo and Walter, and most employees who were not participants in the Pension Plan as of December 31, 2006, including Mr. D'Amico, are provided a Company contribution to their Company qualified 401(k) savings plan (the "Amphenol 401(k) Plan") accounts equal to 2% of their covered earnings. No employee contribution is required for this 2% Company contribution. Covered earnings include base salary and incentive plan compensation. In addition, the Company matches 100% of the employee's first 3% contribution of their covered earnings to his or her Amphenol 401(k) Plan account, including the accounts of Messrs. Norwitt, Lampo, D'Amico and Walter. Mr. Doherty participates in the Amphenol (TCS) 401(k) Plan that matches 100% of up to 5% of his covered earnings to this plan.

        Pursuant to both the Amphenol 401(k) Plan and the Amphenol (TCS) 401(k) Plan (collectively, the "Company's 401(k) Plans"), during the first four years of a participant's employment with the Company, the employer allocation vests 25% per year for each year of service. After four full years of employment with the Company, the employer allocation is fully vested historically and on a going forward basis. Each of Messrs. Norwitt, Lampo, Doherty and Walter are fully vested in all employer allocations. Mr. D'Amico is 25% vested in employer allocations.

        The Company also sponsors a non-qualified supplemental defined contribution plan (the "DC SERP") for selected non-grandfathered participants in the Company's 401(k) Plans. Each of our named executive officers participate in the DC SERP. Participants in the DC SERP are credited with a 5% employer allocation on compensation in excess of the limitations imposed by the Internal Revenue Code. Each named executive officer is also permitted to defer up to 5% of their estimated compensation in excess of the limitations imposed by the Internal Revenue Code to a DC SERP account. A participant may elect to defer base salary and non-equity incentive plan compensation under the DC SERP and a participant's election to defer compensation is made prior to the beginning of each year, and is binding for the applicable year. The participant concurrently selects the timing of the distribution of their deferred compensation. Distributions may occur upon termination of employment (which could include retirement, death or disability) or upon a specified future date while still employed (an "in-service distribution"), as elected by the participant. For the named executive officers, any distribution payable on account of termination of employment will not occur until after six months following termination of employment pursuant to Section 409A of the Internal Revenue Code. Compensation deferred by participants and any matching contributions made by the Company are credited to a bookkeeping account that represents the Company's unsecured obligation to repay the participant in the future.

44

---

Table of Contents

Nonqualified Deferred Compensation for the 2017 Fiscal Year

45

---

Table of Contents

POTENTIAL PAYMENTS UPON TERMINATION OR CHANGE IN CONTROL

        The amount of compensation that may be payable to each named executive officer upon voluntary termination, early retirement, normal retirement, involuntary not-for-cause termination, for-cause termination, termination following a change of control and in the event of disability or death of the executive is shown on the tables on pages 47-49. The amounts shown assume that such termination was effective as of December 31, 2017, and thus include amounts earned through such time and are estimates of the amounts which could have been paid out to the named executive officers in connection with their termination. The actual amounts to be paid out can only be determined in the event of and at the time of such executive's separation from the Company.

        Payments Made Upon Termination.     Regardless of the manner in which a named executive officer's employment is terminated, he or she is entitled to receive amounts earned during his or her term of employment. Such amounts might include:

•

unused vacation pay;



•

amounts accrued and vested through the Company's retirement plans;



•

statutory entitlements; and



•

non-equity incentive compensation relating to the fiscal year.

        Payments Made Upon Retirement.     The Board has the discretion to decide if options will continue to vest following normal retirement at age 65 with at least five years of employment with the Company or upon early retirement at or after age 55 with more than 10 years of employment with the Company. None of the named executive officers is currently eligible for normal retirement. Mr. Walter is eligible for early retirement with more than 10 years of employment with the Company. The disclosure in the tables on pages 47-49 for for early retirement and normal retirement assumes that the named executive officers were eligible to retire and that the Board has exercised its discretion to continue vesting of all unvested options.

        Payments Made Upon Involuntary Not for Cause Termination or Involuntary for Good Reason Termination.     In the event of involuntary not for cause termination or involuntary for good reason termination of any employee, including a named executive officer, in addition to the benefits which might be made as reflected under the heading Payments Made Upon Termination above, the Board has the discretion to decide if options that are not vested at the time of such termination shall vest and the terms of such vesting. The disclosure in the tables below for involuntary not for cause termination and involuntary for good reason termination assumes that the Board has exercised its discretion to continue vesting of all such options.

        Payments Made Upon a Change in Control.     Pursuant to the 2000 Option Plan and the 2009 Option Plan, immediately prior to a change in control, all outstanding options held by any employee, including a named executive officer, immediately vest and become exercisable at the discretion of the Board. A change in control is deemed to occur if there is a sale of all or substantially all of the assets of the Company or there is an acquisition of more than 80% of the Common Stock of the Company by a person or group. Pursuant to the 2017 Option Plan, the plan administrator (currently the Compensation Committee) has discretion to accelerate options upon a change in control. The disclosure in the tables below relating to change in control assumes that the Board has exercised its discretion to cause all shares to vest.

        Payments Made Upon Death or Disability.     In the event of the death or disability of any employee, including a named executive officer, in addition to the benefits which might be made as reflected under the heading Payments Made Upon Termination above, he or she will receive benefits and/or payments under the Company funded disability plan and/or group term life insurance plan, as appropriate. In the event of death or disability as defined in the Company's Option Plans, assuming the minimum service requirements have been satisfied, all outstanding options held by such individual will immediately vest. The disclosure in

46

---

Table of Contents

the tables below assumes that the minimum service requirements for all named executive officers except for Mr. D'Amico have been satisfied.

        Health Care Benefits.     The Company does not currently offer any of the named executive officers any enhanced health care benefits on termination for any reason.

47

---

Table of Contents

48

---

Table of Contents

CEO PAY RATIO

        As required by Section 953(b) of the Dodd-Frank Wall Street Reform and Consumer Protection Act, and Item 402(u) of Regulation S-K, we are providing the following information about the relationship of the annual total compensation of our employees and the annual total compensation of Mr. Norwitt, President and CEO (the "CEO").

        The Company is a vertically-integrated manufacturer with extensive labor-intensive operations in numerous low-cost countries. As of October 1, 2017, we estimate that our employee population consisted of approximately 67,000 individuals globally, with a majority of those employees based in low-cost countries. As such, the Company's disclosed ratio may be higher relative to other companies which rely more heavily on outsourced production or otherwise source products and components from low-cost countries without operating their own manufacturing facilities. We believe our compensation levels are competitive with prevailing wage rates in the local markets in which we operate.

        For 2017, our last completed fiscal year:

•

The annual total compensation of the employee identified at the median compensation level (the "Median Employee) of the Company, other than the CEO, was $12,179.



•

The annual total compensation of the employee identified at the median compensation level (the "Median US Employee") of the US-based employees of the Company, other than the CEO, was $54,532.



•

The annual total compensation of the CEO for purposes of determining the CEO Pay Ratio was $8,165,544.

49

---

Table of Contents

        Based on this information, for 2017, the ratio of the annual total compensation of the CEO to the annual total compensation of the Median Employee was estimated to be 670:1 and the ratio of the annual total compensation of the CEO to annual total compensation of the Median US Employee was estimated to be 150:1.

        The pay ratios above are reasonable estimates calculated in a manner consistent with SEC rules based on our payroll and employment records and the methodologies described below. The SEC rules for identifying the median compensated employee and calculating the pay ratio based on that employee's annual total compensation allow companies to adopt a variety of methodologies, to apply certain exclusions, and to make reasonable estimates and assumptions that reflect their compensation practices. As such, the pay ratio reported by other companies may not be comparable to the pay ratio reported above as other companies may have different employment and compensation practices and may utilize different methodologies, exclusions, estimates and assumptions in calculating their own pay ratios. Moreover, there are a number of factors which make a meaningful comparison of pay ratios difficult, such as industry-specific pay differentials, the geographic location of employee populations and a company's manufacturing strategy (e.g., outsourcing versus insourcing).

        To identify the Median Employee, as well as to determine the annual total compensation of the Median Employee, the methodology and the material assumptions, adjustments and estimates that we used were as follows.

        In the fourth quarter of 2017, the Company completed a process of collecting surveys of compensation data from our global sites because the Company does not have a global Human Resources Information System ("HRIS"). The data provided statistical sampling of the average total compensation for direct labor, indirect labor, and salaried employees from 165 of our estimated 200 operating sites representing all regions globally. These data were sorted and it was determined that based on our representative survey, the median employee was a direct-labor employee in one of our China plants with a total annual compensation of $12,179 (based on the average monthly US dollar to RMB exchange rate in 2017 reported by Bloomberg), including all compensation and a normal measure of overtime (determined in accordance with the summary compensation table rules).

        In addition, a similar analysis was performed using US-only data directly from our HRIS in the United States which currently contains nearly all compensation information for employees of our Company and its subsidiaries in the United States. The Median US Employee (excluding the CEO) was determined to have annual total compensation of $54,532 (determined in accordance with the summary compensation table rules).

        We elected to not exclude any of our employees from the calculation based on the 5% "De Minimis Exemption" adjustment as permitted under SEC rules.

50

---

Table of Contents

PROPOSAL 3. ADVISORY VOTE ON
COMPENSATION OF NAMED EXECUTIVE OFFICERS

        In accordance with Section 14A of the Securities Exchange Act of 1934, as amended, the Board is asking stockholders to approve the following advisory resolution at the 2018 Annual Meeting:

RESOLVED, that the compensation paid to the Company's named executive officers, as disclosed pursuant to Item 402 of Regulation S-K, including the Compensation Discussion and Analysis, compensation tables and narrative discussion is hereby APPROVED.

        The Board recommends a vote FOR this resolution because it believes that the compensation policies and practices of the Company described in the Compensation Discussion and Analysis have been and continue to be effective in helping to achieve the Company's goals of rewarding sustained financial and operating performance and leadership excellence, aligning the executive officers' long-term interests with those of the stockholders and motivating the executive officers to remain with the Company for long and productive careers.

        Stockholders are urged to read the Compensation Discussion and Analysis beginning on page 25 of this Proxy Statement, as well as the Summary Compensation Table and related compensation tables and narrative, appearing on pages 37 through 50 which provide detailed information on the Company's compensation policies and practices and the compensation of the Company's named executive officers.

        This advisory resolution, commonly referred to as a "say-on-pay" resolution, is non-binding on the Board. Although non-binding, the Board and the Compensation Committee will review and consider the voting results when evaluating the Company's executive compensation program on an ongoing basis. The Board favors a policy of providing for annual say-on-pay advisory votes. It is anticipated the next say-on-pay advisory vote will occur at the Company's 2019 Annual Meeting of Stockholders.

        At the 2017 Annual Meeting of Stockholders, the Company's stockholders cast a non-binding advisory vote regarding the compensation of the Company's named executive officers as disclosed in the proxy statement for that meeting. The Company's stockholders overwhelmingly approved the proposal with more than 97% of the shares voted being cast in favor of the proposal.

THE BOARD OF DIRECTORS RECOMMENDS A VOTE FOR APPROVAL OF THE ADVISORY
RESOLUTION ON COMPENSATION OF NAMED EXECUTIVE OFFICERS

51

---

Table of Contents

CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS

        The Company has adopted a written policy for the review and approval of transactions and arrangements between the Company and the Company's current directors, director nominees, current executive officers, greater than five percent stockholders, and their immediate family members. All transactions, regardless of amount, are required to be reported to and reviewed by the General Counsel of the Company who is required to report the results of his review to the Board or independent Directors, as appropriate. Following this review, the Board would determine whether any such transaction is in, or not inconsistent with, the best interests of the Company and its stockholders, taking into consideration whether any such transaction is on terms no less favorable to the Company than those available with unrelated third parties and the related person's interest in the transaction. As required under the rules of the SEC, transactions that are determined to be directly or indirectly material to the Company or a related person must be disclosed in the Company's Proxy Statement.

        A brother of Luc Walter, Senior Vice President and Group General Manager, Amphenol Military and Aerospace Operations, is employed at a foreign subsidiary of the Company. In 2017, Mr. Walter's brother received total compensation of less than $160,000, including salary, bonus/incentive plan compensation and stock options. This amount is consistent with the compensation and benefits provided to other employees with equivalent qualifications, experience and responsibilities at the Company and its subsidiaries. This employment relationship was reviewed and ratified in accordance with the Company's policy.

        No other related party transactions were identified during or subsequent to 2017 where the amount involved exceeded $120,000. As such, there are no other transactions to be reported in this Proxy Statement.

INVESTOR OUTREACH

        Amphenol has continued to engage with key stockholders to discuss, among other items, governance issues to ensure that management and the Board understand and address issues that are important to the Company's stockholders. Through these engagements the Company has obtained valuable feedback. For example, in 2016, the Board adopted an amendment to the Company's By-Laws that, among other things, implemented "proxy access", which, subject to the requirements of the By-Laws, permits any stockholder or group of up to 20 stockholders that beneficially owns at least 3% of the Company's outstanding Common Stock continuously for three years to nominate candidates for election to the Board and to require the Company to list such nominees in the Company's proxy statement. In addition, in 2014, the Company lowered the threshold to call special meetings of stockholders from 50% to 25%. During recent years, the Company has also taken actions to declassify the Board and provide for the annual election of directors. It has also allowed stockholders to act by written consent and eliminated supermajority voting requirements in the Company's Articles of Incorporation and By-Laws.

        The Company has also continued to engage key stockholders to discuss other important topics, such as compensation practices and programs. The Chief Financial Officer reports to the Board on a quarterly basis all shareholder engagements occurring in the prior quarter.

STOCKHOLDER PROPOSALS

        Any stockholder wishing to include a proposal in the Company's proxy statement for the 2019 annual meeting in accordance with Rule 14a-8 of the Exchange Act must submit their proposal in writing by mail to the Secretary of the Company at Amphenol Corporation, 358 Hall Avenue, Wallingford, Connecticut 06492, Attention: Secretary no later than the close of business on December 14, 2018. Stockholder proposals that are sent to any other person or location or by any other means may not be received in a timely manner. In order to avoid controversy, stockholders should submit their proposals by means that permit them to prove the date of delivery. Any stockholder proposal received by the Secretary of the Company after the date specified will not be included in the Company's proxy statement for the

52

---

Table of Contents

2019 annual meeting. Further, all proposals submitted for inclusion in the Company's proxy statement for the 2019 annual meeting must comply with all of the requirements of SEC Rule 14a-8.

        Stockholders of the Company are also entitled by the Company's By-Laws to bring business before the Annual Meeting, including matters not specified in the notice of meeting (other than proposals submitted for inclusion in the Company's proxy material pursuant to Rule 14a-8 of the Exchange Act), by giving timely notice in writing by mail to the Secretary of the Company at Amphenol Corporation, 358 Hall Avenue, Wallingford, Connecticut 06492, Attention: Secretary. Timely notice can be effected by delivering notice that satisfies either of the following time frames. Notice must be delivered not less than 60 days nor more than 90 days prior to the annual meeting, i.e., for the 2018 Annual Meeting, notice should have been received by the Secretary of the Company no earlier than February 16, 2018 and no later than March 18, 2018. Alternatively, if less than 70 days' notice of the meeting has been given to stockholders, as is the case with the 2018 Annual Meeting, notice of the stockholder's proposal must be received in writing by mail by the Secretary of the Company no later than the tenth day following the mailing of the Proxy Statement. Accordingly, such a notice must be received by the Secretary of the Company by April 23, 2018, and must conform to the requirements of the Company's By-Laws, which stipulate that the proposal must include (i) a description of the business to be brought before the meeting, (ii) the reasons for conducting such business at the annual meeting, (iii) the name and record address of the stockholder together with the number of shares beneficially owned and (iv) a description of any material interest of the stockholder in such business.

        In addition, the Company's By-Laws provide a proxy access right permitting stockholders who have beneficially owned 3% or more of the Company's Common Stock continuously for at least 3 years to submit director nominations via the Company's proxy materials for up to 20% of the directors then serving. Notice of proxy access director nominations for the 2019 annual meeting must be delivered in writing by mail to the Secretary of the Company at Amphenol Corporation, 358 Hall Avenue, Wallingford, CT 06492, Attention: Secretary, no earlier than November 25, 2018 and no later than the close of business on December 23, 2018. In addition, the notice must set forth the information required by the Company's By-Laws with respect to each proxy access director nomination that a stockholder intends to present at the 2019 annual meeting.

        A stockholder has given the Company notice of his intention to introduce the following proposal for consideration and action by the stockholders at the Annual Meeting. The stockholder proposal may contain assertions about the Company and its directors that the Company believes are incorrect. The Board has not attempted to refute these assertions and the Company has not corrected any errors in the stockholder proposal.

        The Company will provide the name, address and share ownership of the stockholder proponent upon request.

53

---

Table of Contents

PROPOSAL 4. STOCKHOLDER PROPOSAL FOR SPECIAL
SHAREHOLDER MEETING IMPROVEMENT

Proposal 4—Special Shareholder Meeting Improvement

        Resolved, Shareowners ask our board to take the steps necessary (unilaterally if possible) to amend our bylaws and each appropriate governing document to give holders in the aggregate of 10% of our outstanding common stock the power to call a special shareowner meeting (or the closest percentage to 10% according to state law). This proposal does not impact our board's current power to call a special meeting.

        Special meetings allow shareowners to vote on important matters, such as electing new directors that can arise between annual meetings. This proposal topic won more than 70%-support at Edwards Lifesciences (sponsored by a Chevedden shareholder) and SunEdison in 2013.

        Amphenol shareholders currently do not have the full right to call a special meeting that is available under Delaware law. A shareholder ability to call a special meeting would put shareholders in a better position to ask for improvement in our board of directors after the 2018 annual meeting.

        For instance, our 9-member Board of Directors had 4 members who were not fully independent. There were 2 inside directors—Diana Reardon and Richard Adam Norwitt plus 2 inside related directors—Edward Jepsen and Martin Hans Loeffler. Plus Mr. Loeffler had 30-years long-tenure. Plus John Lord and Ronald Badie had 13 years long-tenure. Long-tenure can impair the independence of a director no matter how well qualified.

        The lack of independence was compounded since the Audit Committee and Nomination committee each had one director who was not fully independent. The long-tenure deficit was compounded by the Executive Pay Committees being 50% controlled by directors with long-tenure. The Audit and Nomination Committees were each 33% controlled by directors with long-tenure.

Please vote to increase management accountability to shareholders:

Special Shareholder Meeting Improvement—Proposal 4

THE BOARD OF DIRECTORS RECOMMENDS A VOTE AGAINST PROPOSAL 4

        The Board has carefully considered this proposal and believes that it is not in the best interests of stockholders in light of Amphenol's existing special meeting right, which allows stockholders who own at least 25% of our capital stock to call a special meeting of stockholders (the "Existing Special Meeting Right"). Consequently, the Board UNANIMOUSLY recommends a vote AGAINST this proposal for the following reasons.

A 25% ownership threshold provides a procedural safeguard against abuse, corporate waste and activist investors with short-term goals and is consistent with overwhelming market practice.

        Amphenol's Existing Special Meeting Right strikes the appropriate balance between ensuring that stockholders have the ability to call a special meeting of stockholders to act on extraordinary and urgent matters, while at the same time protecting against a misuse of this right by a small number of stockholders whose interests may not be aligned with the remaining 90% of our stockholders.

        Failure to aggregate sufficient stock ownership to reach the 25% ownership threshold is a strong indicator that a sufficient interest among the majority of stockholders does not exist to call a special meeting. Lowering this threshold risks giving a small group of stockholders a disproportionate amount of influence over the Company's affairs.

        Convening a special meeting of stockholders imposes significant costs, both administrative and operational. The Board, management and employees must devote a significant amount of time and

54

---

Table of Contents

attention preparing for such meetings, which distracts them from their primary focus of maximizing long-term financial returns for stockholders and operating our business in the best interest of stockholders. In addition, with each special meeting of stockholders, we must incur significant expenses in order to prepare the disclosures required for such meetings, print and distribute materials, solicit proxies and tabulate votes. As a result, special meetings of stockholders should be limited to circumstances where a substantial number of stockholders believe a matter is sufficiently urgent or extraordinary to justify calling a special meeting.

        Amphenol's Existing Special Meeting Right also serves as a protective mechanism against activist investors with short-term goals. Event-driven hedge funds or other activists may pursue a special meeting of stockholders with the goal of being disruptive to our business or to propose issues that prioritize their own short-term exit strategies over the long-term interests of the vast majority of our stockholders. A 25% special meeting threshold ensures that a special meeting of stockholders may only be called by a stockholder or group of stockholders with a substantial stake in our Company. The Existing Special Meeting Right appropriately safeguards stockholder interests and prevents corporate waste, while at the same time ensuring that stockholders have the ability to call special meetings when appropriate.

        Moreover, a 25% special meeting ownership threshold is the overwhelming market practice. Within the S&P 500, 300 companies afford stockholders the right to call a special meeting of stockholders. Of those companies, 40% have a 25% ownership threshold for allowing stockholders to call a special meeting, while only 16% have adopted a 10% ownership threshold.

The Existing Special Meeting Right already provides our stockholders with a meaningful right to call a special meeting.

        The 25% ownership threshold included in Amphenol's Existing Special Meeting Right already provides our stockholders with a meaningful right to call a special meeting of stockholders. Based on our current stockholder base, any combination of four of our current top five stockholders could act together to call a special meeting. Any of those stockholders could also satisfy the 25% ownership threshold by partnering with other large stockholders to call a special meeting with more advocates. If stockholders holding just 10% of our capital stock had the ability to call a special meeting, then either of our two largest stockholders could act alone, or any two of our other top three stockholders would be able to act collectively, to call a special meeting. This could lead to disproportionate influence over our business by a small number of stockholders.

The Existing Special Meeting Right reflects the input of many of Amphenol's stockholders, who previously rejected a special meeting right with a 10% ownership threshold.

        At our 2013 annual meeting of stockholders, our stockholders defeated a proposal nearly identical to the current proposal, which sought to give holders of 10% of our capital stock the power to call a special meeting of stockholders. In response to the failure of that proposal, we engaged with many of our stockholders to discuss, among other items, the ability of our stockholders to call a special meeting. After careful consideration and in response to stockholder feedback, the Board amended the By-Laws in 2014 in order to lower the threshold of the Company's voting power required to call a special meeting of stockholders from 50% to 25%, creating the Existing Special Meeting Right.

We are committed to regular stockholder engagement and strong and effective corporate governance policies that provide sufficient avenues for stockholders to meaningfully engage in Company affairs.

        Amphenol regularly engages with key stockholders to discuss, among other items, governance issues to ensure that management and the Board understand and address issues that are important to the Company's stockholders. Our existing governance policies provide stockholders with numerous avenues to

55

---

Table of Contents

address and discuss our business and governance policies with the Board, and demonstrate our responsiveness and willingness to engage with stockholders and provide them with a meaningful voice.

        Based on stockholder feedback over the past years, the Board has approved amendments to the Company's By-Laws that, among other things:

•

adopted "proxy access;"



•

implemented the Existing Special Meeting Right;



•

declassified the Board and provided for annual election of directors;



•

allowed stockholders to act by written consent; and



•

eliminated the supermajority voting requirements in the Company's Articles of Incorporation and By-Laws.

These corporate governance policies provide our stockholders with many opportunities to be heard and to engage directly with the Board.

        In light of the existing opportunities for stockholder engagement, including the Existing Special Meeting Right, the Board believes that the adoption of this proposal will not make a meaningful difference in our stockholders' ability to engage with the Board or influence Amphenol's business or governance policies.

        For the above reasons, the Board has determined that it is not in the best interests of Amphenol or its stockholders to adopt this proposal. Doing so is unnecessary in light of Amphenol's Existing Special Meeting Right, which allows stockholders who own at least 25% of our capital stock to call a special meeting of stockholders.

        For these reasons, the Board UNANIMOUSLY urges stockholders to vote AGAINST the proposal to decrease the stockholder threshold to call a special meeting of stockholders.

THE BOARD OF DIRECTORS RECOMMENDS A VOTE AGAINST PROPOSAL 4.

56

---

Table of Contents

GENERAL AND OTHER MATTERS

        At the date of this Proxy Statement, the Company knows of no business that will be brought before the 2018 Annual Meeting of Stockholders other than the matters set forth above. However, if any further business properly comes before the Annual Meeting or any adjournments thereof, the persons named as proxies in the accompanying proxy will vote them in accordance with their discretion and judgment on such matters.

        The Company has herewith and/or heretofore provided each stockholder whose proxy is being solicited hereby, a copy of the Company's 2017 Annual Report, including financial statements. Written requests for additional copies should be directed to: Controller, Amphenol Corporation, 358 Hall Avenue, Wallingford, Connecticut 06492. The Company's 2017 Annual Report, including financial statements, is also available from the Company's website at www.amphenol.com by clicking on "Investors", then "Financial Information" and then "Annual Reports".

        If you need directions to attend the Annual Meeting and vote in person, please call 203-265-8606.

PLEASE DATE AND SIGN THE PROXY AND RETURN IT PROMPTLY IN THE ENCLOSED
REPLY ENVELOPE ON WHICH NO POSTAGE NEED BE AFFIXED IF MAILED
IN THE UNITED STATES.

By Order of the Board of Directors,
Lance E. D'Amico
Vice President, Secretary and General Counsel

April 13, 2018

57

---

Table of Contents

Notice of Annual Meeting
and
Proxy Statement

Annual Meeting of Stockholders, May 17, 2018

IMPORTANT: Your proxy is enclosed. Please fill in, date, sign and return your proxy promptly in the enclosed stamped envelope whether or not you plan to be present at the meeting. You may still vote in person if you attend the meeting.

Important Notice Regarding the Availability of Proxy Materials for the Stockholders Meeting to be Held on May 17, 2018: The Proxy Statement and Annual Report to Stockholders for the fiscal year ended December 31, 2017 are available at www.edocumentview.com/APH.

---