# EDGAR Filing Document

**Accession Number:** 0001766368
**File Stem:** 0001558370-23-002858
**Filing Date:** 2023-3
**Character Count:** 101359
**Document Hash:** ff1ea6a62e593d9b788f33c0183fab83
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001558370-23-002858.hdr.sgml**: 20230306

**ACCESSION NUMBER**: 0001558370-23-002858

**CONFORMED SUBMISSION TYPE**: DEF 14A

**PUBLIC DOCUMENT COUNT**: 3

**CONFORMED PERIOD OF REPORT**: 20230418

**FILED AS OF DATE**: 20230306

**DATE AS OF CHANGE**: 20230306

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Mayville Engineering Company, Inc.
- **CENTRAL INDEX KEY:** 0001766368
- **STANDARD INDUSTRIAL CLASSIFICATION:** METAL FORGING & STAMPINGS [3460]
- **IRS NUMBER:** 390944729
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEF 14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-38894
- **FILM NUMBER:** 23707797

**BUSINESS ADDRESS:**
- **STREET 1:** 715 SOUTH STREET
- **CITY:** MAYVILLE
- **STATE:** WI
- **ZIP:** 53050
- **BUSINESS PHONE:** 920-387-4500

**MAIL ADDRESS:**
- **STREET 1:** 715 SOUTH STREET
- **CITY:** MAYVILLE
- **STATE:** WI
- **ZIP:** 53050

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Mayville Engineering Comapny, Inc.
- **DATE OF NAME CHANGE:** 20190130

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**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

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**SCHEDULE 14A INFORMATION**

**Proxy Statement Pursuant to Section 14(a) of the**

**Securities Exchange Act of 1934**

**(Amendment No. &nbsp;&nbsp;&nbsp;&nbsp;)**

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Filed by the Registrant ☒&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐ Preliminary Proxy Statement

☐ **Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))**

☒ Definitive Proxy Statement

☐ Definitive Additional Materials

☐ Soliciting Material Pursuant to §240.14a-12

**MAYVILLE ENGINEERING COMPANY, INC.**

**(Name of Registrant as Specified In Its Charter)**

**(Name of Person(s) Filing Proxy Statement, if other than the Registrant)**

Payment of Filing Fee (Check the appropriate box):

☒ No fee required

☐ Fee paid previously with preliminary materials

☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a6(i)(1) and 0-11

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#### MAYVILLE ENGINEERING COMPANY, INC.

#### NOTICE OF ANNUAL MEETING OF SHAREHOLDERS
**To Be Held April 18, 2023**

To the Shareholders of

Mayville Engineering Company, Inc.:

**NOTICE IS HEREBY GIVEN** that the Annual Meeting of Shareholders of Mayville Engineering Company, Inc. will be held online at www.virtualshareholdermeeting.com/MEC2023 on Tuesday, April 18, 2023, at 2:00 P.M., Central Time, for the following purposes:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. To elect two directors to hold office until the 2026 annual meeting of shareholders and until their successors are duly elected and qualified.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2. To ratify the appointment of Deloitte & Touche LLP as our independent registered public accounting firm for 2023.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3. To consider and act upon such other business as may properly come before the meeting or any adjournment or postponement thereof.

The close of business on February 17, 2023, has been fixed as the record date for the determination of shareholders entitled to notice of, and to vote at, the meeting and any adjournment or postponement thereof.

A proxy for the meeting and a proxy statement are enclosed herewith. You or your proxyholder can participate, vote, and examine our shareholder list at the Annual Meeting by visiting www.virtualshareholdermeeting.com/MEC2023 and using your control number found on your proxy card.

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| |
|:---|
| By Order of the Board of Directors |
| MAYVILLE ENGINEERING COMPANY, INC. |
| Todd M. Butz |
| *Secretary* |

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Mayville, Wisconsin

March 6, 2023

**Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting To Be Held on April 18, 2023. The Mayville Engineering Company, Inc. proxy statement for the 2023 Annual Meeting of Shareholders and the 2022 Annual Report to Shareholders are available at www.proxyvote.com.**

**YOUR VOTE IS IMPORTANT NO MATTER HOW LARGE OR SMALL YOUR HOLDINGS MAY BE. TO ASSURE YOUR REPRESENTATION AT THE MEETING, PLEASE DATE THE ENCLOSED PROXY, WHICH IS SOLICITED BY THE BOARD OF DIRECTORS, SIGN EXACTLY AS YOUR NAME APPEARS THEREON AND RETURN IMMEDIATELY, OR VOTE OVER THE INTERNET OR BY TELEPHONE AS PROVIDED ON YOUR PROXY CARD.**

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#### MAYVILLE ENGINEERING COMPANY, INC.
**715 South Street**

**Mayville, Wisconsin 53050**

#### PROXY STATEMENT

#### FOR

#### ANNUAL MEETING OF SHAREHOLDERS
**To Be Held April 18, 2023**

This proxy statement is being furnished to shareholders by the Board of Directors (the "Board") of Mayville Engineering Company, Inc. (the "Company", "we", "our", "us" or similar terms), beginning on or about March 6, 2023, in connection with a solicitation of proxies by the Board for use at the Annual Meeting of Shareholders to be held online at www.virtualshareholdermeeting.com/MEC2023 on Tuesday, April 18, 2023, at 2:00 P.M., Central Time, and all adjournments or postponements thereof (the "Annual Meeting") for the purposes set forth in the attached Notice of Annual Meeting of Shareholders.

Only holders of record of the Company's common stock, no par value per share (the "Common Stock"), at the close of business on February 17, 2023 (the "Record Date"), are entitled to vote at the Annual Meeting. On that date, the Company had outstanding and entitled to vote 20,172,746 shares of Common Stock, each of which is entitled to one vote per share. The presence of a majority of the votes entitled to be cast shall constitute a quorum for the purpose of transacting business at the Annual Meeting. Abstentions and broker non-votes will be counted as present in determining whether there is a quorum.

To ensure that your vote is recorded promptly, please vote as soon as possible, even if you plan to attend the Annual Meeting by virtual presence online. Whether you hold shares directly as the shareholder of record or beneficially in street name, you may direct how your shares are voted without attending the Annual Meeting. If you are a shareholder of record, you have the option to vote by written proxy or electronically via either the internet or telephone pursuant to instructions provided on the proxy card sent to you. A shareholder of record may access and complete the proxy card online at www.proxyvote.com or vote by telephone (1-800-690-6903), in each case by using the control number provided on your proxy card. If you hold shares beneficially in street name, you may also vote by proxy by following the voting instructions provided to you by your broker, bank, trustee or nominee.

If you attend the Annual Meeting online, you may also vote your shares at www.virtualshareholdermeeting.com/MEC2023 during the meeting, and any previous votes that you submitted will be superseded by the vote that you cast at the Annual Meeting. Please note, however, that if your shares are held of record by a broker, bank or other nominee and you wish to vote at the Annual Meeting, you must obtain from the record holder of those shares a legal proxy issued in your name.

If you hold shares in the Mayville Engineering Company, Inc. Employee Stock Ownership Plan (the "ESOP") and/or the Mayville Engineering Company, Inc. 401(k) Plan (the "401(k) Plan"), you must provide voting instructions to the trustee of those plans by April 13, 2023, which can be done by written proxy or electronically via either the internet or telephone pursuant to instructions provided on the proxy card sent to you. A holder of shares in the ESOP and/or the 401(k) Plan may access and complete the proxy card online at www.proxyvote.com or vote by telephone (1-800-690-6903), in each case by using the control number provided on your proxy card. If no instructions are made or if your completed proxy card is not received by April 13, 2023, the trustee of will votes the shares allocated to your plan account in its sole discretion (for shares in the ESOP) or as directed by the 401(k) Plan sponsor, which is the Company (for shares in the 401(k) Plan).

The format of the Annual Meeting will be a virtual-only meeting. We have worked to offer the same participation opportunities as would be provided at an in person annual meeting.

You may attend and participate in the Annual Meeting by virtual presence online if you were a shareholder or joint holder as of the close of business on the Record Date (February 17, 2023), or you hold a valid proxy for the Annual Meeting. To attend the Annual Meeting by virtual presence online, go to www.virtualshareholdermeeting.com/MEC2023. If you are a shareholder of record or hold shares in the ESOP or the 401(k) Plan, you will also need to provide your control number found on your proxy card. If you are not a shareholder of record and do not hold your shares in the ESOP or the 401(k) Plan, but hold shares through a broker, trustee or nominee, you will also need to obtain a legal proxy from the broker, trustee or nominee that holds your shares, have a copy of the voting instruction card provided by your broker, trustee or nominee, and provide your control number found on the voting instruction card provided by such broker, trustee or nominee.

The virtual Annual Meeting will begin promptly at 2:00 P.M., Central Time. Online check-in will begin at 1:45 P.M., Central Time, and you should allow ample time for the online check-in procedures. If you have difficulty accessing the Annual Meeting, please call the telephone number provided on the login page at www.virtualshareholdermeeting.com/MEC2023. We will have technicians available to assist you.

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Whether or not you participate in the Annual Meeting, it is important that your shares be part of the voting process. The methods by which you may vote are described above and on your proxy card.

Execution of a proxy given in response to this solicitation will not affect a shareholder's right to attend and vote at the Annual Meeting by virtual presence online. Virtual presence at the Annual Meeting of a shareholder who has signed a proxy does not in itself revoke a proxy. Any shareholder giving a proxy may revoke it at any time before it is exercised by giving notice thereof to the Company in writing, by delivering a duly executed proxy bearing a later date or by voting by virtual presence online at the Annual Meeting.

The shares represented by all properly executed unrevoked proxies received in time for the Annual Meeting will be voted as specified on the proxies. If no direction is given on a properly executed unrevoked proxy, it will be voted as follows:

● FOR the two persons nominated for election as directors referred to herein;

● FOR the ratification of the appointment of Deloitte & Touche LLP as our independent registered public accounting firm for 2023; and

● On such other business or matters which may properly come before the Annual Meeting in accordance with the best judgment of the persons named as proxies in the enclosed form of proxy.

Other than the election of two directors and the ratification of the appointment of Deloitte & Touche LLP as our independent registered public accounting firm for 2023, the Board has no knowledge of any matters to be presented for action by the shareholders at the Annual Meeting.

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#### ELECTION OF DIRECTORS
The Company's bylaws provide that the directors shall be divided into three classes, with the classes to be as nearly equal in number as possible, and with the directors serving three-year terms. At the Annual Meeting, the shareholders will elect two directors to hold office until the 2026 annual meeting of shareholders and until their respective successors are duly elected and qualified. Unless shareholders otherwise specify, the shares represented by the proxies received will be voted in favor of the election as directors of the two persons named as nominees herein. The Board has no reason to believe that the listed nominees will be unable or unwilling to serve as directors if elected. However, in the event that any nominee should be unable to serve or for good cause will not serve, the shares represented by proxies received will be voted for another nominee selected by the Board.

Each director will be elected by a plurality of the votes cast at the Annual Meeting, assuming a quorum is present. For this purpose, "plurality" means that the nominees receiving the largest number of votes will be elected as directors. Any shares not voted at the Annual Meeting, whether due to abstentions, broker non-votes or otherwise, will have no impact on the election of the directors. Votes will be tabulated by an inspector of elections appointed by the Company.

The Board is presently composed of eight members, seven of whom are non-employee, independent directors. Due to his desire to retire, Patrick D. Michels, a director of the Company since 2010, is not standing for re-election at the Annual Meeting. The Company acknowledges and thanks Mr. Michels for his service on the Board. As a result, the Board will, effective immediately preceding the Annual Meeting, amend our bylaws to reduce the number of directors from eight to seven.

The following sets forth certain information, as of February 17, 2023, about the Board's nominees for election at the Annual Meeting and each director of the Company whose term will continue after the Annual Meeting.

#### Nominees for Election at the Annual Meeting
*Terms expiring at the 2026 Annual Meeting*

**Steven L. Fisher**, 68, has been a member of the Board since November 2013. He has previously served as an executive at Caterpillar, Inc., where he was a Division Chief Financial Officer from 1991 to 1998 and Vice President from 2005 to 2014. Mr. Fisher currently serves as a member of the advisory board of Palmer Johnson Power Systems. Mr. Fisher received a bachelor's degree in Accounting from Bradley University and is a licensed Certified Public Accountant. We believe Mr. Fisher's substantial experience as an executive of a public company in the manufacturing industry and accounting expertise qualifies him to serve on the Board.

**Robert L. McCormick**, 62, has been a member of the Board since December 2022. He has served as President and Chief Executive Officer and as a director of Douglas Dynamics, Inc., a manufacturer and upfitter of commercial work truck attachments and equipment, since January 2019. Prior to serving in his current position, Mr. McCormick served as Douglas Dynamics' Chief Operating Officer from 2017 to 2019 and Executive Vice President and Chief Financial Officer from 2004 to 2017. Previously, Mr. McCormick served as President and Chief Executive Officer of Xymox Technology Inc. from 2001 to 2004. Prior to that, he served in various capacities in the Newell Rubbermaid Corporation, including President from 2000 to 2001 and Vice President Group Controller from 1997 to 2000. Mr. McCormick graduated from the University of Wisconsin - Whitewater with a bachelor's degree in Accounting in 1982 and received his CPA certificate in 1984. Since 2017, he has been a member of the Board of Directors for nonprofit organization The Parenting Network. We believe that Mr. McCormick's over 40 years of experience in the manufacturing industry and his years as the Chief Executive Officer or Chief Financial Officer of a public company qualifies him to serve as a member of the Board.

**THE BOARD RECOMMENDS THE FOREGOING NOMINEES FOR ELECTION AS DIRECTORS AND URGES EACH SHAREHOLDER TO VOTE "FOR" SUCH NOMINEES. SHARES OF THE COMPANY'S COMMON STOCK REPRESENTED BY EXECUTED BUT UNMARKED PROXIES WILL BE VOTED "FOR" SUCH NOMINEES.**

#### Directors Continuing in Office
*Terms expiring at the 2024 Annual Meeting*

**Allen J. Carlson**, 72, has been a member of the Board since January 2016. Mr. Carlson is currently employed by the University of Florida's College of Engineering, serves as a director of Husco International Inc. and on the Board of Regents of the Milwaukee School of Engineering. Mr. Carlson previously served as a director and the Chief Executive Officer of Sun Hydraulics Corporation from 2000 to 2016. From October 1977 to March 1996, Mr. Carlson held various engineering, marketing and management positions for Vickers Incorporated, a wholly owned subsidiary of Trinova Corporation. Mr. Carlson earned his bachelor's degree from the Milwaukee School of Engineering and is a graduate of the advanced management program at the Harvard Business School. We believe that Mr. Carlson's over 40 years of experience in

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the manufacturing industry and nearly 16 years as the Chief Executive Officer of a public company qualifies him to serve as a member of the Board.

**Timothy L. Christen**, 64, has been a member of the Board since June 2016 and has served as our non-executive Chair of the Board since July 2022. He also serves as a director of Expensify, a cloud-based expense management platform, since 2021 and CPA.com, a provider of innovative strategies and solutions to accounting firms and their clients, since 2018. Mr. Christen is Chairman Emeritus of Baker Tilly US, LLP, a national public accounting firm where he served as a partner from 1990 to 2016 and as Chairman and Chief Executive Officer from 1999 to 2016, and Baker Tilly International Ltd., a top ten global accounting network where he served as Chairman from 2017 to 2021. He was appointed as a trustee of the Financial Accounting Foundation (FAF) as of January 1, 2021. Mr. Christen also served as director of the American Institute of CPAs from 2014 to 2017, serving as Chairman from 2015 to 2016. He earned his bachelor's degree in Accounting from the University of Wisconsin-Platteville and is a licensed Certified Public Accountant. We believe Mr. Christen's forty-plus years of accounting expertise and substantial strategy, risk and management experience over his 16 years as the Chief Executive Officer of a national public accounting firm qualifies him to serve as a member of the Board.

**Jennifer J. Kent**, 51, has been a member of the Board since December 2020. She has served as Chief Legal Officer of Kohl's Corporation, a retailer, since February 2023. Prior to serving in her current position, Ms. Kent was the Executive Vice President and Chief People & Legal Officer of Quad/Graphics, Inc., a marketing experience company, since January 2022 and served in that role since June 2015 under its previous title of Executive Vice President of Administration, General Counsel & Secretary. Ms. Kent joined Quad in August 2010 as Assistant General Counsel and was promoted to Vice President and General Counsel in December 2013. Prior thereto, Ms. Kent held various positions in motorcycle manufacturer Harley-Davidson Motor Company's legal department from 2003 to 2010, including Associate General Counsel. Ms. Kent earned her law degree from Stanford University and a bachelor's degree in journalism from the University of Iowa. We believe Ms. Kent's over 20 years of broad business and leadership experience, including managing legal, compliance, human resources, corporate communications, government affairs, real estate, and safety and environmental management functions at a public company, qualifies her to serve on the Board.

*Terms expiring at the 2025 Annual Meeting*

**Jagadeesh (Jag) A. Reddy**, 51, joined the Company as President and Chief Executive Officer, as well as a director, in July 2022. Prior to joining us, Mr. Reddy served as a member of the senior leadership team at W.R. Grace & Co. since 2018, most recently as the head of its Strategy and Growth function, as well as the Managing Director of its Advanced Refining Technologies hydroprocessing joint venture with Chevron. Before joining W.R. Grace & Co., he served as Vice President and General Manager, Water Technologies Strategic Business Unit from 2014 to 2017, and Vice President, Corporate Strategy from 2012 to 2014 at Pentair plc. Previously, Mr. Reddy held leadership roles of increasing responsibility at ITT Corporation and its spin-off, Xylem Inc. Mr. Reddy also held product management and mergers and acquisitions roles at Danaher Corporation and United Technologies. He started his career in manufacturing operations at Denso Corporation. Mr. Reddy earned a master's of business administration degree in Finance and Strategy from the Kellogg School of Management and a master's degree in Engineering Management from the McCormick School of Engineering, both at Northwestern University. He also holds a master's degree in Industrial Engineering from the University of Tennessee and a bachelor's degree in Mechanical Engineering from Sri Venkateswara University in India. We believe that Mr. Reddy is qualified to serve as a director of our company because he has extensive senior management experience and serves as our President and Chief Executive Officer.

**Jay O. Rothman**, 63, has been a member of the Board since July 2008. He has served as President of the University of Wisconsin System since June 2022. Prior to serving in his current position, Mr. Rothman served as the Chairman and Chief Executive Officer of Foley & Lardner LLP, a national law firm, from June 2011 to May 2022. Mr. Rothman serves as director of Quad/Graphics, Inc. Mr. Rothman received a bachelor's degree from Marquette University in 1982 and a his law degree from Harvard Law School in 1985. We believe that Mr. Rothman's career as an executive, as well as a business attorney, qualifies him to serve as a member of the Board.

#### CORPORATE GOVERNANCE

#### Corporate Governance Guidelines; Code of Conduct and Ethics
The Board has adopted Corporate Governance Guidelines that, in conjunction with the Board committee charters, establish processes and procedures to help ensure effective and responsive governance by the Board. The Corporate Governance Guidelines also establish the Company's policies on director orientation and continuing education, which include a mandatory orientation program for new directors and provide that the Board will be assessed on an annual basis to determine whether it and its committees are functioning effectively. In addition, the Company's Corporate Governance Guidelines provide that, at each regularly scheduled Board meeting, the independent directors meet in executive session. The independent directors may also meet at such other times as any of them determine appropriate. The Corporate Governance Guidelines also provide that the Company's executive officers and other members of senior management who are not members of the Board will participate in Board meetings to present information, make recommendations and be available for direct interaction with

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members of the Board. The Nominating and Corporate Governance Committee and the Board are responsible for regularly reviewing and revising the Corporate Governance Guidelines and related documents as and when appropriate. The Company has posted a copy of the Corporate Governance Guidelines on its website at ir.mecinc.com.

We have adopted a Code of Conduct and Ethics that applies to all of our directors, officers and employees, including our Chief Executive Officer and Chief Financial Officer and other persons performing similar functions. We have posted a copy of the Code of Conduct and Ethics on our website at ir.mecinc.com.

Other than the text of the Corporate Governance Guidelines and Code of Conduct and Ethics, the Company is not including the information contained on or available through its website as a part of, or incorporating such information by reference into, this proxy statement.

#### Director Independence; Board Leadership Structure
The Board has adopted director independence standards to assist it in making determinations regarding whether the Company's directors are independent as that term is defined in the listing standards of the New York Stock Exchange (the "NYSE"). These standards are available on the Company's website at ir.mecinc.com. Based on these standards, the Board determined that all of the our non-employee directors (i.e., all directors except for Mr. Reddy, who is our President and Chief Executive Officer) are "independent directors" as that term is defined in the listing standards of the NYSE and the director independence standards adopted by the Board. In making this determination, the Board considered the current and prior relationships that each non-employee director has with the Company and all other facts and circumstances the Board deemed relevant in determining their independence, including the transactions described in the section titled "—Transactions with Related Persons" below.

Our Board believes it is important to have flexibility in selecting our Board leadership structure. Accordingly, our Corporate Governance Guidelines allow for the positions of Chair of the Board and Chief Executive Officer of the Company to be held by the same person. In connection with the transition of our Chief Executive Officer in July 2022, the Board decided that it was in the best interests of the Company and its shareholders to separate the roles of Chief Executive Officer and Chair of the Board, and our Board has been led by an independent, non-executive Chair since that time. The Board believes separating the roles of Chief Executive Officer and Chair of the Board enhances the accountability of the Chief Executive Officer to the Board, strengthens the Board's independence from management, and ensures a greater role for the independent directors in the oversight of the Company. In addition it allows our Chief Executive Officer to focus his efforts on running our business and managing our Company in the best interests of our shareholders, while the Chair provides guidance to the Chief Executive Officer and, in consultation with management, helps to set the agenda for Board meetings and establishes priorities and procedures for the work of the full Board.

#### Prohibition on Derivatives, Hedging Transactions, Margin Accounts and Pledges
We have adopted a policy that prohibits all of our directors, officers and employees from trading in puts, calls and other derivative securities with respect to shares of our stock that they were granted as part of their compensation or otherwise hold. In addition, this policy prohibits all of our directors, officers and employees from purchasing any financial instruments (including prepaid variable forward contracts, equity swaps, collars and exchange funds) or otherwise engaging in transactions that are designed to or have the effect of hedging or offsetting any decrease in the market value of our stock. Our directors, officers and certain other designated employees are also prohibited from holding our stock in a margin account or pledging our stock as collateral for a loan.

#### Board Meetings
The Board held seven meetings in 2022. During the period of the directors' service in 2022, each of the directors attended at least 75% of the meetings of the Board and the committees on which they served during 2022.

At each regularly-scheduled Board meeting, the independent directors meet separately in executive session. An independent director presides over each executive session of the independent directors. The independent director who presides may differ from meeting to meeting, which is dependent on the subject matter of the agenda of the executive session.

Directors are expected to attend our annual meeting of shareholders each year. At the 2022 annual meeting of shareholders, all of the directors then serving were in attendance.

#### Committees
The Board currently has a standing Audit Committee, Compensation Committee and Nominating and Corporate Governance Committee. Each of these committees has the responsibilities set forth in formal written charters adopted by the Board. The Company makes available

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copies of each of these charters free of charge on its website located at ir.mecinc.com. Other than the text of the charters, the Company is not including the information contained on or available through its website as a part of, or incorporating such information by reference into, this proxy statement.

#### Audit Committee
The Audit Committee assists the Board in fulfilling the oversight responsibilities the Board has with respect to (i) the integrity of our financial statements, (ii) our compliance with legal and regulatory requirements, (iii) the qualifications and independence of our independent registered public accounting firm and (iv) the performance of our internal audit function and our independent registered public accounting firm. The Audit Committee has responsibility for the appointment, compensation, retention and oversight of our independent registered public accounting firm, which reports directly to the Audit Committee. The Audit Committee is also responsible for preparing an audit committee report to be included in our annual proxy statement, and reviews, approves and oversees on an on-going basis any related party transactions. The Audit Committee has authority to preapprove all auditing and permitted non-audit services to be performed by our independent registered public accounting firm, subject to the de minimis exceptions provided under the Securities Exchange Act of 1934, as amended. The Audit Committee has established procedures for the receipt, retention and treatment of complaints received by the Company regarding accounting and auditing matters.

The Audit Committee presently consists of Steven L. Fisher (Chairperson), Timothy L. Christen, Robert L. McCormick and Patrick D. Michels, each of whom is independent as defined in Rule 10A-3 of the Securities Exchange Act of 1934 and under the listing standards of the NYSE, as well as the director independence standards adopted by the Board. In addition, the Board has determined that each member of the Audit Committee qualifies as an "audit committee financial expert" as defined by the rules of the Securities and Exchange Commission and meets the expertise requirements for audit committee members under the listing standards of the NYSE. The Audit Committee held four meetings in 2022.

#### Compensation Committee
The purposes of the Compensation Committee are to (i) assist the Board in discharging its responsibilities relating to the compensation of our executive officers, (ii) administer our incentive and equity compensation plans and (iii) provide oversight of the policies and practices relating to employee relations and human resource activities. The Compensation Committee approves the compensation of our executive officers, including the Chief Executive Officer. The Compensation Committee also provides oversight of the design of all our retirement and health and welfare plan programs and human resource management practices and policies, including hiring and retention, performance management programs, diversity policies and practices, leadership development and manager succession planning. It has authority to retain or obtain the advice of compensation consultants to assist with regard to any of its activities. The Compensation Committee also administers our incentive and equity compensation plans.

The Compensation Committee presently consists of Jennifer J. Kent (Chairperson), Allen J. Carlson and Steven L. Fisher, each of whom meets the independence standards of the NYSE and the Securities and Exchange Commission for compensation committee members, as well as the director independence standards adopted by the Board. The Compensation Committee held twelve meetings in 2022.

In 2022, the Compensation Committee retained Willis Towers Watson to provide it with market information, analysis and other advice relating to executive compensation on an ongoing basis. The Compensation Committee engaged Willis Towers Watson to, among other things, assist in developing an appropriate group of peer companies to help us determine the appropriate level of overall compensation for our executive officers, as well as to assess each separate element of compensation, with a goal of ensuring that the compensation we offer to our executive officers, individually as well as in the aggregate, is competitive and fair. We do not believe the retention of, or the work performed by, Willis Towers Watson creates any conflict of interest.

#### Nominating and Corporate Governance Committee
The purposes of the Nominating and Corporate Governance Committee are to (i) carry out the responsibilities delegated to it by the Board relating to our director nomination process and procedures, (ii) identify individuals qualified to become members of the Board (consistent with criteria approved by the Board), (iii) select and recommend to the Board qualified potential director nominees for election at each of the annual meeting of shareholders, (iv) develop, maintain and recommend to the Board a set of corporate governance guidelines applicable to us, (v) oversee the evaluation of the Board, its committees and management and (vi) oversee, in concert with the Audit Committee, compliance with the rules, regulations and ethical standards for our directors, officers and employees, including corporate governance matters and practices.

The Nominating and Corporate Governance Committee presently consists of Jay O. Rothman (Chairperson), Allen J. Carlson and Timothy L. Christen, each of whom meets the independence standards of the NYSE for Nominating and Corporate Governance Committee

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members, as well as the director independence standards adopted by the Board. The Nominating and Corporate Governance Committee held five meetings in 2022.

#### Board Oversight of Risk
The Board, as a whole and through its committees, has responsibility for the oversight of risk management at the Company. In its risk oversight role, the Board has the responsibility to satisfy itself that the risk management processes designed and implemented by management are adequate and functioning as designed. The Board receives reports from management on financial, operational, legal compliance and reputation risks and the degree of exposure to those risks. The Board helps ensure that management is properly focused on risk by, among other things, reviewing and discussing the performance of senior management and business units of the Company.

The Board oversees an enterprise-wide approach to risk management, which is designed to (i) support the achievement of organizational objectives, including strategic objectives, (ii) improve long-term organizational performance and (iii) enhance shareholder value. Several Board committees are responsible for risk oversight in specific areas. The Board relies on its Audit Committee to address significant financial risk exposures and the steps management has taken to monitor, control and report such exposures to the full Board, including the Company's risk assessment and risk management guidelines and policies. The Compensation Committee monitors and evaluates risks arising from the Company's compensation policies and practices for its employees. The Board's role in the Company's risk oversight has not affected the Board's leadership structure. During 2022, the Board and its committees also reviewed and discussed with management macroeconomic conditions, including inflation, rising interest rates and recessionary concerns, as well as ongoing supply chain challenges, labor availability and cost pressures, and the COVID-19 pandemic, and management's strategies and initiatives to respond to, and mitigate, any adverse impacts.

#### Nominations of Directors
The Nominating and Corporate Governance Committee will consider persons recommended by shareholders to become nominees for election as directors. Recommendations for consideration by the Nominating and Corporate Governance Committee should be sent to the Secretary of the Company in writing together with appropriate biographical information concerning each proposed nominee. The Company's bylaws also set forth certain requirements for shareholders wishing to nominate director candidates. See the section titled "Miscellaneous—Shareholder Proposals" below for additional information.

In identifying and evaluating nominees for director, the Nominating and Corporate Governance Committee seeks to ensure that the Board possesses, in the aggregate, the strategic, managerial and financial skills and experience necessary to fulfill its duties and to achieve its objectives, and seeks to ensure that the Board is comprised of directors who have broad and diverse backgrounds, possessing knowledge in areas that are of importance to the Company. The Nominating and Corporate Governance Committee looks at each nominee on a case-by-case basis regardless of who recommended the nominee. In looking at the qualifications of each candidate to determine if their election would further the goals described above, the Nominating and Corporate Governance Committee will consider areas of expertise and competencies that candidates may have to offer as well as the overall composition and diversity of the Board. In addition, the Board and the Nominating and Corporate Governance Committee believe that the Board as a collective whole should have the following technical skills and experience:

● Executive leadership experience.

● Manufacturing operations expertise.

● Sales and marketing experience.

● Expertise with technology, particularly around artificial intelligence.

● Public company compliance/governance experience.

● Employee stock ownership plan governance expertise.

● Executive compensation expertise.

● Diversity, which may include diversity based on gender, ethnicity, experience and perspective.

The Nominating and Corporate Governance Committee also believes that nominees for director should possess the following attributes:

● Team player/collaborative.

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&nbsp;&nbsp;&nbsp;&nbsp;

● Ability and willingness to challenge and probe.

● Candor and willingness to share opposing viewpoints.

● Common sense and sound judgment.

● Integrity and high ethical standards.

● Interpersonal skills.

● Ability to listen.

● Oral communication skills.

● Understanding of effective decision-making processes.

● Willingness and ability to devote time and energy to the role.

#### Communications with the Board of Directors
Shareholders or interested parties may communicate with the Board by writing to Mayville Engineering Company, Inc., Board of Directors (or, at the writer's option, to a specific director or to the independent directors as a group), c/o Todd M. Butz, Secretary, 715 South Street, Mayville, Wisconsin 53050. The Secretary will ensure that the communication is delivered to the Board, the specified director or the specified group of directors, as the case may be.

#### Transactions with Related Persons
Except as otherwise disclosed in this section, we had no related person transactions during 2022, and none are currently proposed, in which we were a participant and in which any related person had a direct or indirect material interest. Our Board has adopted written policies and procedures regarding related person transactions. For purposes of these policies and procedures:

● A "related person" means a director, executive officer, nominee for director or greater than 5% beneficial owner of our common stock, in each case since the beginning of the most recently completed year, and any member of the immediate family of such persons; and

● A "related person transaction" generally is a transaction between the Company and related persons in which the aggregate amount involved exceeds or may be expected to exceed $120,000 and in which a related person had or will have a direct or indirect material interest.

Our Audit Committee is responsible for reviewing, approving or ratifying all related party transactions. The Audit Committee's decision whether or not to approve or ratify a proposed transaction is made in light of whether consummation of the transaction is believed by the Audit Committee to not be or have been contrary to the best interests of the Company.

Jay O. Rothman, one of our directors, was a partner in the law firm of Foley & Lardner LLP until May 2022, and Foley provides legal services to us. For this legal work, we paid Foley approximately $940,000 during the year ended December 31, 2022.

*Compensation Committee Interlocks and Insider Participation*. Jennifer J. Kent, one of our directors, was the Executive Vice President and Chief People & Legal Officer of Quad/Graphics, Inc. until February 2023. QuadMed, LLC, a subsidiary of Quad/Graphics, provides certain health care services to certain of our employees. For these health care services, we paid QuadMed approximately $528,000 during the year ended December 31, 2022.

Based on its review, the Audit Committee determined that the transactions conducted with Foley & Lardner LLP and QuadMed, LLC were fair and reasonable to the Company and on terms no less favorable to the Company than could be obtained in a comparable arm's length transaction with unrelated third parties. In approving these transactions, the Audit Committee also determined that they were in the best interests of the Company.

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#### 2022 DIRECTOR COMPENSATION
Directors who are employees of the Company receive no compensation for service as members of either the Board or committees thereof. Directors who are not employees of the Company receive $8,000 for each meeting of our Board attended, $2,000 for each meeting of our Board committees attended and $1,000 for each telephonic meeting of our Board committees joined. Starting in July 2022 when we separated the roles of Chief Executive Officer and Chair of the Board, the non-executive Chair of the Board also receives an annual retainer of $50,000, half of which is payable in cash and the other half of which is payable in restricted stock units (which was prorated in 2022). Our non-employee directors also receive an annual equity grant of restricted stock units with a target grant date value of $125,000. The restricted stock units generally vest on the first anniversary of the grant date (or the next annual meeting of the shareholders, if earlier), contingent on the non-employee director's continued service until the vesting date or earlier death or disability. Our non-employee directors are permitted to defer the settlement of their restricted stock units, and any awards deferred are reflected in the Stock Awards column of the table below in the year granted. We also reimburse all ordinary and necessary expenses incurred in the conduct of our business. Starting in 2023, the chairperson of each of the Audit, Compensation, and Nominating and Corporate Governance Committees will also receive an annual cash retainer of $10,000.

The following table provides information regarding the compensation of our non-employee directors during 2022:

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| | | | |
|:---|:---|:---|:---|
| <br>**Name** | **Fees Earned or**<br>**Paid in Cash ($)** | **Stock** <br>**Awards**<sup>(1)</sup> | **Total** <br>**($)** |
| Allen J. Carlson | $75000 | $125006 | $200006 |
| Timothy L. Christen | $82250 | $143759 | $226009 |
| Steven L. Fisher | $75000 | $125006 | $200006 |
| Jennifer J. Kent | $71000 | $125006 | $196006 |
| Robert L. McCormick<sup>(2)</sup> | $— | $— | $— |
| Patrick D. Michels | $44000 | $125006 | $169006 |
| Jay O. Rothman | $60000 | $125006 | $185006 |

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&nbsp;&nbsp;&nbsp;&nbsp;(1) The amounts reported in this column represent the aggregate grant date fair value of director restricted stock unit awards granted to directors on April 19, 2022, as computed in accordance with Financial Accounting Standard Board Accounting Standards Codification Topic 718. These amounts reflect the accounting cost that will be incurred by the Company over the requisite service period of one-year, beginning at the date of grant, for these restricted stock units and do not represent the actual economic value that may be realized by the non-employee director. For information on the assumptions used to calculate the grant date fair value of the restricted stock units, please see Note 17 to our consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2022. Pursuant to Securities and Exchange Commission rules, the amounts shown exclude the impact of estimated forfeitures related to service-based vesting conditions. Mr. Christen had 17,259 unvested restricted stock units outstanding as of December 31, 2022 and each other non-employee director, except for Mr. McCormick who joined the Board on December 21, 2022, had 14,485 unvested restricted stock units outstanding as of December 31, 2022.

&nbsp;&nbsp;&nbsp;&nbsp;(2) Mr. McCormick joined the Board on December 21, 2022.

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#### REPORT OF THE AUDIT COMMITTEE
In accordance with its written charter, the Audit Committee's purposes include assisting the Board in fulfilling its oversight responsibilities with respect to (i) the integrity of the Company's financial statements; (ii) the Company's compliance with legal and regulatory requirements; and (iii) the qualifications and independence of the independent registered public accounting firm.

In fulfilling its responsibilities, the Audit Committee has reviewed and discussed the audited financial statements contained in the 2022 Annual Report on Form 10-K with the Company's management and independent registered public accounting firm.

The Audit Committee discussed with the independent registered public accounting firm matters required to be discussed under the applicable requirements of the Public Company Accounting Oversight Board regarding communications with audit committees. In addition, the Company's independent registered public accounting firm provided to the Audit Committee the written disclosures and the letter required by applicable requirements of the Public Company Accounting Oversight Board regarding the independent registered public accounting firm's communications with the Audit Committee concerning independence, and the Audit Committee discussed with the independent registered public accounting firm the firm's independence. The Audit Committee pre-approves all audit and permissible non-audit services provided by the independent registered public accounting firm. The Audit Committee has considered whether the provision of the services relating to the *Audit-Related Fees*, *Tax Fees* and *All Other Fees* set forth in the section titled "Miscellaneous – Independent Registered Public Accounting Firm" below was compatible with maintaining the independence of the independent registered public accounting firm and determined that such services did not adversely affect the independence of the firm.

In reliance on the reviews and discussions referred to above, the Audit Committee recommended to the Board (and the Board has approved) that the audited financial statements be included in the Company's Annual Report on Form 10-K for the year ended December 31, 2022, for filing with the Securities and Exchange Commission.

This report shall not be deemed incorporated by reference by any general statement incorporating by reference this proxy statement into any filing under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended, and shall not otherwise be deemed filed under such Acts.

AUDIT COMMITTEE

Steven L. Fisher, Chairperson

Timothy L. Christen

Robert L. McCormick

Patrick D. Michels

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#### PRINCIPAL SHAREHOLDERS
The following table sets forth certain information regarding the beneficial ownership of Common Stock as of the Record Date (i.e., February 17, 2023) by: (1) each director and director nominee; (2) each of the executive officers named in the Summary Compensation Table; (3) all of the directors, director nominees and executive officers (including the executive officers named in the Summary Compensation Table) as a group; and (4) each person or entity known to the Company to be the beneficial owner of more than 5% of the Common Stock. Except as otherwise indicated in the footnotes, each of the holders listed below has sole voting and investment power over the shares beneficially owned. The footnotes also indicate instances in which the same shares are reported as held by two or more holders. As of the Record Date, there were 20,172,746 shares of Common Stock outstanding.

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| | | |
|:---|:---|:---|
| | **Shares Beneficially Owned** | **Shares Beneficially Owned** |
| <br>**Name of Beneficial Owner** | **Shares** | **%** |
| **Directors and Named Executive Officers**<sup>(1)</sup> |  |  |
| Jagadeesh (Jag) A. Reddy | 27071<br> <sup>(2)</sup> | \* |
| Todd M. Butz | 353402<br> <sup>(2)</sup> | 1.7% |
| Ryan F. Raber | 274244<br> <sup>(2)</sup> | 1.3 |
| Allen J. Carlson | 56135<br> <sup>(3)</sup> | \* |
| Timothy L. Christen | 118909<br> <sup>(3)</sup> | \* |
| Steven L. Fisher | 53635<br> <sup>(3)</sup> | \* |
| Jennifer J. Kent | 20720<br> <sup>(3)</sup> | \* |
| Robert L. McCormick | 0 | \* |
| Patrick D. Michels | 81135<br> <sup>(3)</sup> | \* |
| Jay O. Rothman | 61135<br> <sup>(3)</sup> | \* |
| Robert D. Kamphuis<sup>(4)</sup> | 1109591<br> <sup>(2)</sup> | 5.3% |
| All current directors, nominees and executive officers as a group (12 persons) | 1213931<br> <sup>(2)(3)</sup> | 5.9% |
| **Other Holders** |  |  |
| ESOP<sup>(5)</sup> | 5684879<br> <sup>(6)</sup> | 28.2% |
| 401(k) Plan<sup>(7)</sup> | 3080787<br> <sup>(8)</sup> | 15.3% |
| Allspring<sup>(9)</sup> | 2547901 | 12.6% |

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\* Denotes less than 1%.

&nbsp;&nbsp;&nbsp;&nbsp;(1) The address of all directors and named officers is c/o Mayville Engineering Company, Inc., 715 South Street, Mayville, Wisconsin 53050.

&nbsp;&nbsp;&nbsp;&nbsp;(2) Includes shares of Common Stock that may be purchased under stock options which are currently exercisable or exercisable within 60 days of February 17, 2023, and shares of Common Stock attributable to restricted stock units that could be received within 60 days of February 17, 2023, as follows: Mr. Reddy, 0 shares; Mr. Butz, 229,803 shares; Mr. Raber, 199,392 shares; all current executive officers as a group, 573,534 shares; and Mr. Kamphuis, 608,711 shares.

&nbsp;&nbsp;&nbsp;&nbsp;(3) Includes shares of Common Stock attributable to director restricted stock units that could be received within 60 days of February 17, 2023, as follows: Mr. Christen, 17,259 shares; each of Ms. Kent and Messrs. Carlson, Fisher, Michels and Rothman, 14,485 shares; and all current directors and nominees as a group, 89,684 shares.

&nbsp;&nbsp;&nbsp;&nbsp;(4) Mr. Kamphuis retired as the Company's Chairman, President and Chief Executive Officer effective July 19, 2022.

&nbsp;&nbsp;&nbsp;&nbsp;(5) The trustee of the ESOP is GreatBanc Trust Company and its address is 801 Warrenville Road, Suite 500, Lisle, Illinois 60532. ESOP participants have the right to direct the vote of the shares allocated to his or her ESOP account. However, if a participant does not timely direct the voting of his or her shares, then the ESOP trustee will vote such shares in its independent fiduciary discretion.

&nbsp;&nbsp;&nbsp;&nbsp;(6) Includes shares of Common Stock held by the following executive officers of the Company in the ESOP (and which are also reported in his, her or their holdings in this table): Mr. Reddy, 0 shares; Mr. Butz, 18,905 shares; Mr. Raber, 18,866 shares; all current executive officers as a group, 37,951 shares; and Mr. Kamphuis, 31,671 shares.

&nbsp;&nbsp;&nbsp;&nbsp;(7) The trustee of the 401(k) Plan is Principal Trust Company and its address is 711 High Street, Des Moines, Iowa 50392. 401(k) Plan participants have the right to direct the vote of the shares allocated to his or her 401(k) Plan account. However, if a participant does not timely direct the voting of his or her shares, then the 401(k) Plan trustee will vote such shares as directed by the 401(k) Plan sponsor, which is the Company.

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&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;(8) Includes shares of Common Stock held by the following executive officers of the Company in the 401(k) Plan (and which are also reported in his, her or their holdings in this table): Mr. Reddy, 0 shares; Mr. Butz, 19,343 shares; Mr. Raber, 9,449 shares; all current executive officers as a group, 30,259 shares; and Mr. Kamphuis, 48,673 shares.

&nbsp;&nbsp;&nbsp;&nbsp;(9) The number of shares owned set forth above in the table is as of or about December 31, 2022 as reported by Allspring Global Investments Holdings, LLC, Allspring Global Investments, LLC and Allspring Funds Management, LLC (all of the foregoing, collectively, "Allspring") in its amended Schedule 13G filed with the Securities and Exchange Commission. The address for Allspring is 525 Market Street, 10 <sup>th</sup> Floor, San Francisco, California 94105. Allspring Global Investments Holdings, LLC reports sole voting power with respect to 2,480,299 of these shares, shared voting power with respect to none of these shares, sole dispositive power with respect to 2,547,901 of these shares and shared dispositive power with respect to none of these shares. Allspring Global Investments, LLC reports sole voting power with respect to 708,943 of these shares, shared voting power with respect to none of these shares, sole dispositive power with respect to 2,545,162 of these shares and shared dispositive power with respect to none of these shares. Allspring Funds Management, LLC reports sole voting power with respect to 1,771,356 of these shares, shared voting power with respect to none of these shares, sole dispositive power with respect to 2,739 of these shares and shared dispositive power with respect to none of these shares.

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**DELINQUENT SECTION 16(a) REPORTS**

Section 16(a) of the Securities Exchange Act of 1934 requires the Company's directors, executive officers and any owner of greater than 10% of the Company's Common Stock to file reports with the Securities and Exchange Commission concerning their ownership of the Company's Common Stock. Based solely upon information provided to the Company by individual directors and executive officers, the Company believes that, during the year ended December 31, 2022, all of its directors and executive officers and owners of greater than 10% of the Company's Common Stock complied with the Section 16(a) filing requirements, except that the Form 4s for each of our then executive officers (i.e., Robert D. Kamphuis, Todd M. Butz, Ryan F. Raber and Randall P. Stille), reporting their annual grants of restricted stock units and stock options, were not timely filed.

#### RATIFICATION OF THE APPOINTMENT OF

#### INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
The Audit Committee has appointed Deloitte & Touche LLP to serve as our independent registered public accounting firm for the year ending December 31, 2023.

We are asking our shareholders to ratify the appointment of Deloitte & Touche LLP as our independent registered public accounting firm. Although ratification is not required, our Board is submitting the appointment of Deloitte & Touche LLP to our shareholders for ratification because we value our shareholders' views on our independent auditors and as a matter of good corporate practice. In the event that our shareholders fail to ratify the appointment, the Audit Committee will consider it as a direction to consider the appointment of a different firm. Even if the appointment is ratified, the Audit Committee in its discretion may select a different independent auditor at any time if it determines that such a change would be in the best interests of the Company and our shareholders.

Representatives of Deloitte & Touche LLP are expected to be present at the Annual Meeting with the opportunity to make a statement if they so desire. Such representatives are also expected to be available to respond to appropriate questions.

Assuming a quorum is present at the Annual Meeting, the number of votes cast for the ratification of the Audit Committee's appointment of Deloitte & Touche LLP as our independent registered public accounting firm for the year ending December 31, 2023 must exceed the number of votes cast against it. Abstentions and broker non-votes will be counted as present in determining whether there is a quorum; however, they will not constitute a vote "for" or "against" ratification and will be disregarded in the calculation of votes cast.

**THE BOARD OF DIRECTORS RECOMMENDS A VOTE "FOR" RATIFICATION OF THE APPOINTMENT OF DELOITTE & TOUCHE LLP AS OUR INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM. SHARES OF THE COMPANY'S COMMON STOCK REPRESENTED BY EXECUTED BUT UNMARKED PROXIES WILL BE VOTED "FOR" RATIFICATION OF THE APPOINTMENT OF DELOITTE & TOUCHE LLP AS OUR INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM.**

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#### EXECUTIVE COMPENSATION
This section discusses the material components of the executive compensation program for our executive officers who are named in the "Summary Compensation Table for 2022" below. Our named executive officers for 2022 were:

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| | |
|:---|:---|
| **Name**<sup>(1)</sup> | **Principal Position** |
| Jagadeesh (Jag) A. Reddy | President and Chief Executive Officer<sup>(2)</sup> |
| Todd M. Butz | Chief Financial Officer |
| Ryan F. Raber | Executive Vice President - Strategy, Sales & Marketing |
| Robert D. Kamphuis | Former Chairman, President and Chief Executive Officer<sup>(3)</sup> |

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&nbsp;&nbsp;&nbsp;&nbsp;(1) As an "emerging growth company," our "named executive officers" consist of the individuals who served as our principal executive officer and our two other most highly compensated officers who served as executive officers during our last completed fiscal year.

&nbsp;&nbsp;&nbsp;&nbsp;(2) Mr. Reddy became our President and Chief Executive Officer effective July 19, 2022

&nbsp;&nbsp;&nbsp;&nbsp;(3) Mr. Kamphuis retired as Chairman, President and Chief Executive prior to Mr. Reddy's appointment and retired from employment with our company effective September 30, 2022

This discussion may contain forward-looking statements that are based on our current plans, considerations, expectations and determinations regarding future compensation programs. Actual compensation programs that we adopt following the completion of this offering may differ materially from the currently planned programs summarized in this discussion.

#### Summary Compensation Table for 2022
The following table provides information regarding the compensation of our named executive officers during 2022 and 2021.

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| | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| <br>**Name and Principal Position** | <br>**Year** | <br>**Salary**<br>**($)** | <br>**Bonus**<br>**($)**<sup>(1)</sup> | <br>**Stock**<br>**awards**<br>**($)**<sup>(2)</sup> | <br>**Option**<br>**awards**<br>**($)**<sup>(3)</sup> | **Non-equity**<br>**incentive plan**<br>**compensation**<br>**($)** | **Non-qualified**<br>**deferred**<br>**compensation**<br>**earnings ($)** | ****<br>**All other**<br>**compensation**<br>**($)**<sup>(4)</sup> | <br>**Total ($)** |
| Jag A. Reddy | 2022 | 295962 | 286470 | 650000 |  |  |  | 37173 | 1269605 |
| &nbsp;&nbsp;*President and Chief Executive Officer*<sup>(5)</sup> |  |  |  |  |  |  |  |  |  |
|  | 2021 |  |  |  |  |  |  |  |  |
| Todd M. Butz | 2022 | 460000 | 468538 | 375000 | 375000 |  |  | 7674 | 1686212 |
| &nbsp;&nbsp;*Chief Financial Officer* | 2021 | 410000 | 447868 | 275000 | 275000 |  |  | 6804 | 1414672 |
| Ryan F. Raber | 2022 | 460000 | 390448 | 415000 | 415000 |  |  | 7674 | 1688122 |
| &nbsp;&nbsp;*Executive Vice President – <br>Strategy, Sales & Marketing* | 2021 | 410000 | 373223 | 300000 | 300000 |  |  | 6804 | 1390027 |
| Robert D. Kamphuis | 2022 | 572316 | 843750 |  |  |  |  |  | 1416066 |
| &nbsp;&nbsp;*Former Chairman, President* |  |  |  |  |  |  |  |  |  |
| &nbsp;&nbsp;*and Chief Executive Officer*<sup>(6)</sup> | 2021 | 690100 | 942297 | 1140000 | 1140000 |  |  | 6804 | 3919201 |

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&nbsp;&nbsp;&nbsp;&nbsp;(1) The amounts in this column for 2022 represent annual cash bonuses earned on a discretionary basis for 2022 and paid in 2023 as described below under the heading "Incentive Compensation Plans – 2022 Annual Cash Bonus."

&nbsp;&nbsp;&nbsp;&nbsp;(2) The Stock Awards column represents the aggregate grant date fair value, computed in accordance with Financial Accounting Standards Board Accounting Standards Codification Topic 718 ("ASC Topic 718"), for restricted stock units that were granted pursuant to the Mayville Engineering Company, Inc. 2019 Omnibus Incentive Plan (the "Omnibus Plan"). Information about the assumptions that we used when valuing equity awards is set forth in our Annual Report on Form 10-K in Note 17 to the Consolidated Financial Statements for our fiscal year ended December 31, 2022. Pursuant to Securities and Exchange Commission rules, the amounts shown exclude the impact of estimated forfeitures related to service-based vesting conditions.

&nbsp;&nbsp;&nbsp;&nbsp;(3) The Option Awards column represents the aggregate grant date fair value, computed in accordance with ASC Topic 718, for stock options that were granted pursuant to the Omnibus Plan. Information about the assumptions that we used when valuing equity awards is set forth in our Annual Report on Form 10-K in Note 17 to the Consolidated Financial Statements for our fiscal year ended December 31, 2022.

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Pursuant to Securities and Exchange Commission rules, the amounts shown exclude the impact of estimated forfeitures related to service-based vesting conditions.

&nbsp;&nbsp;&nbsp;&nbsp;(4) The amounts in this column for 2022 represent, for Mr. Reddy, reimbursement of temporary housing and travel expenses in the amount of $23,838 and a related tax gross-up of $13,335, and for Mr. Butz and Mr. Raber, amounts credited or expected to be credited by us to the named executive officer's account under our 401(k) Plan for 2022.

&nbsp;&nbsp;&nbsp;&nbsp;(5) Mr. Reddy became our President and Chief Executive Officer effective July 19, 2022

&nbsp;&nbsp;&nbsp;&nbsp;(6) Mr. Kamphuis retired Chairman, President and Chief Executive prior to Mr. Reddy's appointment and retired from employment with our company effective September 30, 2022.

#### Employment, Severance or Change in Control Agreements
*Agreements with Mr. Reddy*

As previously disclosed, in connection with his appointment as our President and Chief Executive Officer, we and Mr. Reddy entered into a severance agreement and a Change in Control Employment and Severance Agreement (the "Reddy Change in Control Agreement"). The severance agreement provides for a lump sum severance benefit equal to one times Mr. Reddy's then-current annual base salary and target annual cash bonus in the event that his employment is involuntarily terminated without cause or he terminates for good reason prior to a change in control of our company. As a condition of receiving such severance, Mr. Reddy is required to execute a release and waiver of claims.

The Reddy Change in Control Agreement provides for certain protections relating to Mr. Reddy's employment during a two-year period following a change in control of our company. If, during the protected period, Mr. Reddy's employment is terminated by us without cause, other than by reason of death or disability, or Mr. Reddy terminates his employment with good reason, then, if Mr. Reddy provides a release of claims, he will be entitled to a severance payment of two times the sum of his annual base salary and target annual bonus. The Reddy Change in Control Agreement also provides that Mr. Reddy would be entitled to continued life insurance, hospitalization, medical and dental coverage for 24 months following the termination of employment. Any equity-based and cash incentive awards granted after the change in control will be deemed immediately earned or vested in full as of the termination of employment.

Prior to a change in control, the Reddy Change in Control Agreement does not restrict our right to terminate Mr. Reddy's employment for any reason. However, if Mr. Reddy's employment is terminated by us without cause within 180 days prior to a change in control and he reasonably demonstrates that the termination was at the request of the acquirer or otherwise arose in connection with or in anticipation of the change in control, he will be entitled to the protections under the Reddy Change in Control Agreement described above.

The Reddy Change in Control Agreement imposes restrictive covenants on Mr. Reddy, including non-solicitation of our customers, non-competition with us and non-interference with our employees during his employment and for 12 months after employment ends. The Reddy Change in Control Agreement also obligates Mr. Reddy to protect our confidential information.

The Reddy Change in Control Agreement does not provide for any tax gross-ups. To the extent payments in connection with the change in control would trigger the parachute payment excise tax under Section 4999 of the Internal Revenue Code of 1986, then Mr. Reddy will either receive the total payments and pay the excise tax or have the total payments reduced such that no excise tax will be imposed, whichever is better for him on an after-tax basis.

*Agreements with Other Named Executive Officers*

We have entered into executive severance agreements with Messrs. Butz and Raber and, prior to the announcement of his retirement, Mr. Kamphuis, that provide a lump sum severance benefit equal to one times, in the case of Messrs. Butz and Raber, and one and one-half times, in the case of Mr. Kamphuis, the executive's then-current annual base salary and target annual cash bonus in the event that his employment is involuntarily terminated without cause or he terminates for a good reason prior to a change in control of the Company. As a condition of receiving such severance the executive would be required to execute a release and waiver of claims. Mr. Kamphuis's agreement was superseded by his Retirement Transition Agreement described below.

We also maintain Change in Control Employment and Severance Agreements ("Change in Control Agreements") with each of our executive officers, including our named executive officers. Mr. Reddy's Change in Control Agreement is the Reddy Change in Control Agreement described above. The other Change in Control Agreements provide for certain protections relating to the executive officers' employment during a two-year period following a change in control of the Company. If, during the protected period, the executive officer's employment is terminated by the Company without cause, other than by reason of death or disability, or the executive officer terminates his employment with good reason, then, if the executive officer provides a release of claims, he will be entitled to a severance payment of two times (three times, in the case of Mr. Kamphuis prior to his retirement) the sum of his annual base salary and target annual bonus. Each Change

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in Control Agreement also provides that the executive officer would be entitled to continued life insurance, hospitalization, medical and dental coverage for 24 months (36 months, in case of Mr. Kamphuis prior to his retirement) following the termination of employment. Any equity-based and cash incentive awards granted after the change in control will be deemed immediately earned or vested in full as of the termination of employment.

Prior to a change in control, the Change in Control Agreements do not restrict our right to terminate the executive officer's employment for any reason. However, if the executive officer's employment is terminated by us without cause within 180 days prior to a change in control and the executive officer reasonably demonstrates that the termination was at the request of the acquirer or otherwise arose in connection with or in anticipation of the change in control, the executive officer will be entitled to the protections under the Change in Control Agreements described above.

The Change in Control Agreements impose restrictive covenants on the executive officers, including non-solicitation of Company customers, non-competition with the Company and non-interference with Company employees during the executive officer's employment and for 12 months after employment ends. The Change in Control Agreements also obligate executive officers to protect the Company's confidential information.

The Change in Control Agreements do not provide for any tax gross-ups. To the extent payments in connection with the change in control would trigger the parachute payment excise tax under Section 4999 of the Internal Revenue Code of 1986, as amended, then the executive officer will either receive the total payments and pay the excise tax or have the total payments reduced such that no excise tax will be imposed, whichever is better for the executive officer on an after-tax basis.

*Mr. Kamphuis's Retirement Transition Agreement*

As previously disclosed, in connection with his retirement announcement on March 31, 2022, we and Mr. Kamphuis entered into a Retirement Transition Agreement (the "Retirement Agreement") and an Agreement on Confidentiality, Assignment of Intellectual Property, Non-Competition and Non-Solicitation (the "Confidentiality Agreement"). The Retirement Agreement provided for Mr. Kamphuis's continued employment until September 30, 2022 (the "Retirement Date") and that our Board could accelerate the Retirement Date in its discretion, provided that, even if the Retirement Date was accelerated, we would continue to honor the terms and conditions of the Retirement Agreement. The Retirement Agreement also provided that Mr. Kamphuis would continue to receive his current base salary through September 30, 2022 and would be eligible to receive a pro-rated bonus for 2022 based on actual performance; his then-unvested equity-based awards would be forfeited as of the Retirement Date; his then-vested stock options would remain outstanding and would expire on the 10th anniversary of the grant date of such options to the extent not exercised prior to such 10th anniversary, subject to the terms and conditions of the applicable award agreement; and we would repurchase Mr. Kamphuis's residence for his original purchase price upon request at any time prior to March 15, 2023. Under the Confidentiality Agreement, Mr. Kamphuis would be subject to customary confidentiality, non-competition and non-solicitation obligations and will agree to customary provisions regarding assignment of intellectual property.

#### Incentive Compensation Plans

#### 2022 Annual Cash Bonus
During 2022, our named executive officers were eligible to receive annual cash bonuses based on the achievement of certain performance conditions established by our Compensation Committee. The performance goals had both (1) company performance measures, which were Return on Net Capital Employed ("RONCE"), and Adjusted EBITDA (defined as net loss before interest expense, benefit for income taxes, depreciation, amortization, stock-based compensation expenses, chief executive officer transition costs, Hazel Park repositioning costs, and impairment charges on long-lived assets and inventory specifically purchased to meet obligations under the agreement with our fitness customer), and (2) individual performance measures. The performance goals for each element were pre-established at threshold, target and maximum performance levels.

The performance measures that applied to each named executive officer were as follows. The applicable measures were weighted as follows: 40% RONCE, 40% Adjusted EBITDA and 20% individual performance, which is determined on a discretionary basis. For 2022, actual performance with respect to the financial performance goals was above threshold but below target. Individual performance was deemed satisfactory on a discretionary basis.

Our Compensation Committee also established specific target bonus payouts for each named executive officer, which are expressed as a percentage of each named executive officer's base salary. For 2022, the named executive officer target payouts as a percentage of base salary were: Mr. Reddy; 100%; Mr. Butz 120%; Mr. Raber 100%; and Mr. Kamphuis 150%. The annual cash bonus paid earned on the basis of the performance measures described above would be calculated by multiplying the applicable weightings by the percentages of achievement to derive the percentages shown in the table below, and multiplying the sum of those percentages by the bonus target payouts for each named executive officer and each named executive officer's base salary. Mr. Reddy's bonus was pro rated for his partial year of service, and our

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Compensation Committee determined in its discretion to pay Mr. Kamphuis's bonus at the target level. In 2022, the annual cash bonus calculations based on the performance measures described above were as follows:

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| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
|  | <br>**RONCE** <br>**(%)** | <br>**Adjusted** <br>**EBITDA** <br>**(%)** | <br>**Individual** <br>**(%)** | <br>**Total** <br>**Bonus** <br>**Percentage** <br>**Achieved** <br>**(%)** | <br>**Bonus** <br>**Target** <br>**(%)** | <br>**Base** <br>**Salary** <br>**($)** | **Annual** <br>**Cash Bonus** <br>**Earned** <br>**Based on** <br>**Performance** <br>**Measures** <br>**($)** |
| Jagadeesh (Jag) A. Reddy | 26.6 | 38.3 | 20.0 | 84.9 | 100 | 675000 | 286470 |
| Todd M. Butz | 26.6 | 38.3 | 20.0 | 84.9 | 120 | 460000 | 468538 |
| Ryan F. Raber | 26.6 | 38.3 | 20.0 | 84.9 | 100 | 460000 | 390448 |
| Robert D. Kamphuis | 26.6 | 38.3 | 20.0 | 84.9 | 150 | 750000 | 843750 |

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#### Incentive Compensation Decisions for 2022
Our Compensation Committee approved annual grants of equity-based awards to our named executive officers, consisting of restricted stock units and stock options. These awards were granted under our Omnibus Plan and are subject to the vesting at a rate of 50% per year over the first two anniversaries of the grant date, contingent on the award holder's continued employment until the vesting date or earlier death or disability. The awards are reflected in the "Stock Awards" and "Option Awards" columns, respectively, of the Summary Compensation Table for 2022 above and in the Outstanding Equity Awards Table as of December 31, 2022 below.

#### 401(k) Plan; ESOP; Nonqualified Deferred Compensation

#### Mayville Engineering Company, Inc. 401(k) Plan and ESOP
Our named executive officers are eligible to participate in the 401(k) Plan on the same basis as other employees who satisfy the 401(k) Plan's eligibility requirements. The 401(k) Plan has an employee stock ownership component under which participants may invest their accounts in shares of our Common Stock. In addition to the employee stock ownership component of the 401(k) Plan, we maintain the separate ESOP.

Our named executive officers are eligible to participate in the ESOP on the same basis as other employees who satisfy the ESOP's eligibility requirements.

Under our 401(k) Plan, our named executive officers, along with other 401(k) Plan participants, are eligible for discretionary profit sharing contributions and, in 2022, the Board authorized contributions of approximately 2.6% of the employee's annual salary. We did not make any discretionary contributions under the ESOP for 2022.

We do not provide any defined-benefit pension benefits.

#### Mayville Engineering Company Deferred Compensation Plan
Our named executive officers are eligible to participate in the Mayville Engineering Company Deferred Compensation Plan (the "Deferred Compensation Plan"), which permits eligible participants to make elective deferrals of up to 50% of the participant's annual base salary and up to 100% of the participant's annual short-term cash incentive compensation. Each year, we credit to the account of each participant an amount reflecting the amount, if any, of any reduced allocations, due solely to the participant's elective deferrals under the Deferred Compensation Plan with respect to our "safe harbor" contributions and discretionary employer contributions to the ESOP and 401(k) Plan and employer non-elective contributions to the 401(k) Plan for the year. Deferred amounts credited to a participant's account are generally distributed following the participant's separation from service, in a lump sum or up to five annual installments, as elected by the participant. Upon a change in control, the Deferred Compensation Plan will terminate and all amounts deferred under the plan will be distributed, generally in a lump sum.

A participant's Deferred Compensation Plan account is deemed to be invested in one or more alternate investment options, such as a mutual fund, for purposes of tracking the deemed investment gain or loss on the participant's account. During 2022, the investment options under the Deferred Compensation Plan generally followed the investment options available under the 401(k) Plan, except that there is no Common Stock investment alternative available under the Deferred Compensation Plan.

The accounts of the participants, including the named executive officers, in the Deferred Compensation Plan reflect amounts contributed to the plan by the participants, as well as earnings on these voluntary deferred amounts. The Deferred Compensation Plan is non-funded and

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unsecured in that it represents only a contractual promise by us to make benefit payments in the future and participants in the Deferred Compensation Plan have the status of general unsecured creditors of our Company.

#### Other Elements of Compensation
*Health/Welfare Plans.* All of our full-time employees, including our named executive officers, are eligible to participate in our health and welfare plans, including:

● medical, dental and vision benefits;

● medical and dependent care flexible spending accounts;

● short-term and long-term disability insurance; and

● life insurance.

We believe the benefits described above are necessary and appropriate to provide a competitive compensation package to our named executive officers.

*Cost Guarantee.* Prior to his retirement, we maintained a cost guarantee arrangement with Mr. Kamphuis under which, in exchange for Mr. Kamphuis' relocation to the Mayville area, we agreed to guarantee the return of the initial cost of his home in the event of his death, disability or termination of employment. In addition, if the value of the guarantee was in excess of the current fair market value at the time of the termination, then we would provide a make-whole payment to Mr. Kamphuis for any personal income tax liability he incurs as a result of the guarantee and any taxes due as a result of the make-whole payment. We entered into this arrangement with Mr. Kamphuis to encourage him to relocate to the Mayville area because we believe that it is valuable to us to have our President and Chief Executive Officer in close proximity to our headquarters. No payments were made under this cost guarantee arrangement in connection with Mr. Kamphuis's retirement.

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#### Outstanding Equity Awards as of December 31, 2022
The following table contains information concerning equity awards held by our named executive officers that were outstanding as of December 31, 2022.

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| | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| | **Option Awards** | **Option Awards** | **Option Awards** | **Option Awards** | **Stock Awards** | **Stock Awards** | **Stock Awards** | **Stock Awards** |
| <br>**Name** | <br>**Number of**<br>**Securities**<br>**Underlying**<br>**Unexercised**<br>**Options (#)**<br>**Exercisable** | <br>**Number of**<br>**Securities**<br>**Underlying**<br>**Unexercised**<br>**Options (#)**<br>**Unexercisable** | <br>**Option**<br>**Exercise**<br>**Price**<br>**($)** | <br>**Option**<br>**Expiration**<br>**Date** | <br>**Number**<br>**of Shares**<br>**of Stock**<br>**That**<br>**Have Not**<br>**Vested (#)** | <br>**Market**<br>**Value of**<br>**Shares of**<br>**Stock That**<br>**Have Not**<br>**Vested**<sup>(1)</sup>**($)** | **Equity**<br>**Incentive**<br>**Plan**<br>**Awards;**<br>**Number**<br>**of**<br>**Unearned**<br>**Shares,**<br>**Units or**<br>**Other**<br>**Rights**<br>**That**<br>**Have Not**<br>**Vested**<br>**(#)** | **Equity**<br>**Incentive**<br>**Plan**<br>**Awards;**<br>**Market**<br>**or Payout**<br>**Value of**<br>**Unearned**<br>**Shares,**<br>**Units or**<br>**Other**<br>**Rights**<br>**That**<br>**Have Not**<br>**Vested ($)** |
| Jagadeesh A. Reddy |  |  |  |  | 96154<br><sup>(2)</sup> | 1217310 |  |  |
| Todd M. Butz |  | 69963<br><sup>(3)</sup> | $10.32 | 2/28/2032 |  |  |  |  |
|  | 19842 | 19841<br><sup>(4)</sup> | $14.01 | 2/28/2031 |  |  |  |  |
|  | 88029 |  | $7.12 | 2/27/2030 |  |  |  |  |
|  | 39126 |  | $17.00 | 5/08/2029 |  |  |  |  |
|  |  |  |  |  | 46151<br><sup>(5)</sup> | 584272 |  |  |
| Ryan F. Raber |  | 77426<br><sup>(3)</sup> | $10.32 | 2/28/2032 |  |  |  |  |
|  | 21646 | 21645<br><sup>(4)</sup> | $14.01 | 2/28/2031 |  |  |  |  |
|  | 58979 |  | $7.12 | 2/27/2030 |  |  |  |  |
|  | 27594 |  | $17.00 | 5/08/2029 |  |  |  |  |
|  |  |  |  |  | 50920<br><sup>(6)</sup> | 644647 |  |  |
| Robert D. Kamphuis | 82252 |  | $14.01 | 2/28/2031 |  |  |  |  |
|  | 370775 |  | $7.12 | 2/27/2030 |  |  |  |  |
|  | 155684 |  | $17.00 | 5/08/2029 |  |  |  |  |
|  |  |  |  |  |  | 644647 |  |  |

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&nbsp;&nbsp;&nbsp;&nbsp;(1) Market value computed by multiplying the number of restricted stock units that have not vested by $12.66, which was the closing price of a share of our Common Stock on the last trading day of 2022.

&nbsp;&nbsp;&nbsp;&nbsp;(2) The restricted stock units will vest 1/3 on each of July 19, 2023, 2024 and 2025.

&nbsp;&nbsp;&nbsp;&nbsp;(3) The options will vest 50% on each of February 28, 2023 and February 28, 2024.

&nbsp;&nbsp;&nbsp;&nbsp;(4) The options will vest on February 28, 2023.

&nbsp;&nbsp;&nbsp;&nbsp;(5) 27,983 restricted stock units will vest on February 28, 2023; and 18,168 restricted stock units will vest on February 28, 2024.

&nbsp;&nbsp;&nbsp;&nbsp;(6) 30,814 restricted stock units will vest on February 28, 2023; and 20,106 restricted stock units will vest on February 28, 2024.

#### Omnibus Plan
We did not maintain any equity incentive plan prior to our initial public offering in May 2019. However, in connection with our initial public offering, our board of directors and the ESOP, as our sole shareholder, adopted the Omnibus Plan, under which the stock options and restricted stock units described above were granted to our named executive officers in 2022. The following description of certain material terms of the Omnibus Plan is qualified by reference to the full text of the Omnibus Plan.

#### Administration
The Omnibus Incentive Plan is administered by our board of directors or our compensation committee, or any other committee or subcommittee or one or more of our officers to whom authority has been delegated (collectively, as the "Administrator"). The Administrator

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has the authority to interpret the Omnibus Incentive Plan or award agreements entered into with respect to the plan; make, change, and rescind rules and regulations relating to the Omnibus Incentive Plan; make changes to, or reconcile any inconsistency in, the Omnibus Incentive Plan or any award or agreement covering an award; and take any other actions needed to administer the Omnibus Incentive Plan.

#### Eligibility
The Administrator may designate any of the following as a participant under the Omnibus Incentive Plan: any officer or employee, or individuals engaged to become an officer or employee, of our Company or our affiliates; and consultants of our Company or our affiliates, and our directors, including our non-employee directors.

#### Types of Awards
The Omnibus Incentive Plan permits the Administrator to grant stock options, stock appreciation rights, performance shares, performance units, shares of Common Stock, restricted stock, restricted stock units, cash incentive awards, dividend equivalent units, or any other type of award permitted under the Omnibus Incentive Plan. The Administrator may grant any type of award under the Omnibus Incentive Plan to any participant it selects, but only our employees or our subsidiaries' employees may receive grants of incentive stock options within the meaning of Section 422 of the Internal Revenue Code. Awards may be granted alone or in addition to, in tandem with, or (subject to the repricing prohibition described below) in substitution for any other award (or any other award granted under another plan of our Company or any affiliate, including the plan of an acquired entity).

#### Change of Control
Upon a change of control (as defined in the Omnibus Incentive Plan), the successor or surviving corporation may agree to assume some or all outstanding awards or replace them with the same type of award with similar terms and conditions, without the consent of any participant, subject to the following requirements:

Each award that is assumed must be appropriately adjusted, immediately after such change of control, to apply to the number and class of securities that would have been issuable to a participant upon the consummation of such change of control had the award been exercised, vested, or earned immediately prior to such change of control, and other appropriate adjustment to the terms and conditions of the award may be made.

If the securities to which the awards relate after the change of control are not listed and traded on a national securities exchange, then (a) each participant must be provided the option to elect to receive, in lieu of the issuance of such securities, cash in an amount equal to the fair value of the securities that would have otherwise been issued, and (b) no reduction may be taken to reflect a discount for lack of marketability, minority, or any similar consideration, for purposes of determining the fair value of such securities.

If a participant is terminated from employment without cause, or due to death or disability, or the participant resigns employment for good reason (as defined in any award or other agreement between the participant and our Company or an affiliate) within two years following the change of control, then upon such termination, all of the participant's awards in effect on the date of such termination will vest in full or be deemed earned in full.

If the purchaser, successor, or surviving entity does not assume the awards or issue replacement awards, then immediately prior to the change of control date, unless the Administrator otherwise determines:

● Each stock option or SAR then held by a participant will become immediately and fully vested, and all stock options and SARs will be cancelled on the change of control date in exchange for a cash payment equal to the excess of the change of control price of the shares of Common Stock over the purchase or grant price of such shares under the award.

● Unvested restricted stock and RSUs (that are not performance awards) will vest in full.

● All performance shares, performance units, and cash incentive awards for which the performance period has expired will be paid based on actual performance, and all such awards for which the performance period has not expired will be cancelled in exchange for a cash payment equal to the amount that would have been due under such awards, valued assuming achievement of target performance goals at the time of the change of control, prorated based on the number of full months elapsed in the performance period.

● All unvested dividend equivalent units will vest (to the same extent as the award granted in tandem with such units) and be paid.

● All other unvested awards will vest and any amounts payable will be paid in cash.

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#### MISCELLANEOUS

#### Independent Registered Public Accounting Firm
Deloitte & Touche LLP acted as the independent registered public accounting firm for the Company since January 10, 2019. The Audit Committee is solely responsible for the selection, retention, oversight and, when appropriate, termination of the Company's independent registered public accounting firm.

The fees to Deloitte & Touche LLP, our current independent registered public accounting firm, for all services rendered for each of the last two years were as follows:

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| | | |
|:---|:---|:---|
|  | **2022** | **2021** |
| Audit Fees<sup>(1)</sup> | $476469 | $403053 |
| Audit-Related Fees<sup>(2)</sup> |  |  |
| Tax Fees<sup>(3)</sup> | 40097 | 18228 |
| All Other Fees<sup>(4)</sup> |  |  |
| Total | $516566 | $421281 |

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&nbsp;&nbsp;&nbsp;&nbsp;(1) Audit of annual financial statements, review of financial statements included in Form 10-Q and other documents filed with the Securities and Exchange Commission, and other services normally provided in connection with statutory and regulatory filings, including out-of-pocket expenses.

&nbsp;&nbsp;&nbsp;&nbsp;(2) Services related to the Company's audit, including out of pocket expenses.

&nbsp;&nbsp;&nbsp;&nbsp;(3) Tax consultations and tax return preparation including out-of-pocket expenses.

&nbsp;&nbsp;&nbsp;&nbsp;(4) Consulting services and studies.

The Audit Committee has established pre-approval policies and procedures with respect to audit and permitted non-audit services to be provided by its independent registered public accounting firm. Pursuant to these policies and procedures, the Audit Committee may form, and delegate authority to, subcommittees consisting of one or more members when appropriate to grant such pre-approvals, provided that decisions of such subcommittee to grant pre-approvals are presented to the full Audit Committee at its next scheduled meeting. The Audit Committee's pre-approval policies do not permit the delegation of the Audit Committee's responsibilities to management. In 2022, the Audit Committee pre-approved all services provided by our independent registered public accounting firm, and no fees to the independent registered public accounting firm were approved pursuant to the de minimis exception under the Securities and Exchange Commission's rules.<sup>9</sup>

#### Expenses
The cost of soliciting proxies will be borne by the Company. In addition to soliciting proxies by mail, proxies may be solicited personally and by telephone by certain officers and regular associates of the Company. Such individuals will not be paid any additional compensation for such solicitation. The Company will reimburse brokers and other nominees for their reasonable expenses in communicating with the persons for whom they hold Common Stock.

#### Multiple Shareholders Sharing the Same Address
Pursuant to the rules of the Securities and Exchange Commission, services that deliver the Company's communications to shareholders that hold their stock through a bank, broker or other holder of record may deliver to multiple shareholders sharing the same address a single copy of the Company's annual report to shareholders and proxy statement, unless the Company has received contrary instructions from one or more of the shareholders. Upon written or oral request, the Company will promptly deliver a separate copy of the annual report to shareholders and/or proxy statement to any shareholder at a shared address to which a single copy of each document was delivered. For future deliveries of annual reports to shareholders and/or proxy statements, shareholders may also request that we deliver multiple copies at a shared address to which a single copy of each document was delivered. Shareholders sharing an address who are currently receiving multiple copies of the annual report to shareholders and/or proxy statement may also request delivery of a single copy. Shareholders may notify the Company of their requests by calling or writing Todd M. Butz, Secretary, Mayville Engineering Company, Inc., at (920) 387-4500 or 715 South Street, Mayville, Wisconsin 53050.

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#### Shareholder Proposals
Proposals that shareholders of the Company intend to present at and have included in the Company's proxy statement for the 2024 annual meeting pursuant to Rule 14a-8 under the Securities Exchange Act of 1934, as amended ("Rule 14a-8"), must be received by the Company by the close of business on November 7, 2023. In addition, a shareholder who otherwise intends to present business at the 2024 annual meeting (including nominating persons for election as directors) must comply with the requirements set forth in the Company's bylaws. Among other things, our bylaws provide that shareholders seeking to bring business before an annual meeting must provide timely notice of their proposal in writing to the Secretary of the Company. To be timely, a shareholder's notice for the 2024 annual meeting must be received on or before December 31, 2023 (assuming a meeting before May 1, 2024). If the date of the 2024 annual meeting is on or after May 1, 2024, then the deadline for receipt by the Company of a timely notice under the bylaws is extended one day after December 31, 2023 for each day after April 30, 2024 until the date of the 2024 annual meeting (for example, if the 2024 annual meeting will be held on May 12, 2024, then the notice deadline under the Company's bylaws would be January 12, 2024). The bylaws also specify requirements as to the form and content of a shareholder's notice. In addition, to comply with the Securities and Exchange Commission's universal proxy rules, shareholders who intend to solicit proxies in support of director nominees other than the Company's nominees must provide notice that sets forth the additional information required by Rule 14a-19 under the Securities Exchange Act of 1934 on or before December 31, 2023 (assuming a meeting before May 1, 2024).

Under the bylaws, if the Company does not receive timely notice of a shareholder proposal submitted otherwise than pursuant to Rule 14a-8 (i.e., proposals shareholders intend to present at the 2024 annual meeting but do not intend to include in the Company's proxy statement for such meeting), then the Company will not be required to present such proposal at the 2024 annual meeting. If the Board chooses to present such proposal at the 2024 annual meeting, then the persons named in proxies solicited by the Board for the 2024 annual meeting may exercise discretionary voting power with respect to such proposal.

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| |
|:---|
| By Order of the Board of Directors |
| MAYVILLE ENGINEERING COMPANY, INC. |
| Todd M. Butz |
| *Secretary* |

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March 6, 2023

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| &nbsp;&nbsp;![GRAPHIC](tmb-20230418xdef14a_bg001.jpg) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Signature [PLEASE SIGN WITHIN BOX] Date Signature (Joint Owners) Date TO VOTE, MARK BLOCKS BELOW IN BLUE OR BLACK INK AS FOLLOWS: KEEP THIS PORTION FOR YOUR RECORDS DETACH AND RETURN THIS PORTION ONLY THIS PROXY CARD IS VALID ONLY WHEN SIGNED AND DATED. V00289-P84015 ! ! ! For All Withhold All For All Except For Against Abstain ! ! ! To withhold authority to vote for any individual nominee(s), mark "For All Except" and write the number(s) of the nominee(s) on the line below. MAYVILLE ENGINEERING COMPANY, INC. 715 SOUTH STREET MAYVILLE, WISCONSIN 53050 Nominees: 01) Steven L. Fisher 02) Robert L. McCormick NOTE: In their discretion, the Proxies are authorized to vote upon such other business as may properly come before the meeting, or any adjournment or postponement thereof. 2. Ratification of the appointment of Deloitte & Touche LLP as our independent registered public accounting firm for 2023. 1. Election of Directors: Terms expiring at the 2026 Annual Meeting MAYVILLE ENGINEERING COMPANY, INC. The Board of Directors recommends you vote FOR the following: The Board of Directors recommends you vote FOR the following proposal: Please sign exactly as name(s) appear(s) hereon. When shares are held by joint tenants, both should sign. When signing as an attorney, executor, administrator, trustee, or guardian, please give full title as such. If a corporation, please sign in full corporate name by President or other authorized officer. If a partnership, please sign in partnership name by authorized person. VOTE BY INTERNET Before The Meeting - Go to www.proxyvote.com or scan the QR Barcode above Use the Internet to transmit your voting instructions and for electronic delivery of information up until 11:59 p.m. Eastern Time the day before the cut-off date or meeting date. Have your proxy card in hand when you access the web site and follow the instructions to obtain your records and to create an electronic voting instruction form. During The Meeting - Go to www.virtualshareholdermeeting.com/MEC2023 You may attend the meeting via the Internet and vote during the meeting. Have the information that is printed in the box marked by the arrow available and follow the instructions. VOTE BY PHONE - 1-800-690-6903 Use any touch-tone telephone to transmit your voting instructions up until 11:59 p.m. Eastern Time the day before the cut-off date or meeting date. Have your proxy card in hand when you call and then follow the instructions. VOTE BY MAIL Mark, sign and date your proxy card and return it in the postage-paid envelope we have provided or return it to Vote Processing, c/o Broadridge, 51 Mercedes Way, Edgewood, NY 11717. SCAN TO VIEW MATERIALS & VOTEw |

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| &nbsp;&nbsp;![GRAPHIC](tmb-20230418xdef14a_bg002.jpg) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;V00290-P84015 Important Notice Regarding the Availability of Proxy Materials for the Annual Meeting: The Notice and Proxy Statement and 2022 Annual Report to Shareholders are available at www.proxyvote.com. MAYVILLE ENGINEERING COMPANY, INC. 2023 ANNUAL MEETING OF SHAREHOLDERS Common Stock Held Outside Any Plan This Proxy is Solicited on Behalf of the BOARD OF DIRECTORS The undersigned hereby appoints Jagadeesh A. Reddy and Todd M. Butz, and each of them, as Proxies with the power of substitution (to act jointly or, if only one acts, then by that one) and hereby authorizes them to represent and to vote as designated on the reverse side all of the shares of Common Stock of Mayville Engineering Company, Inc. held of record by the undersigned on February 17, 2023 at the Annual Meeting of Shareholders to be held on April 18, 2023, or any adjournment or postponement thereof. This proxy when properly executed will be voted in the manner directed herein. If no direction is made, this proxy will be voted in accordance with the Board of Directors' recommendations. All votes must be received by 11:59 PM, Eastern Time, on April 17, 2023. Employee Stock Ownership Plan\*\* This Proxy is Solicited on Behalf of the GREATBANC TRUST COMPANY As a participant in the Mayville Engineering Company, Inc. Employee Stock Ownership Plan (the "Plan"), you have the right to direct GreatBanc Trust Company, as trustee for Company stock held in the Plan (the "Trustee"), to vote the shares of Company stock allocated to your Plan account as of February 17, 2023, at the Annual Meeting of Shareholders to be held on April 18, 2023, or any adjournment or postponement thereof. 401(k) Plan\*\* This Proxy is Solicited on Behalf of PRINCIPAL TRUST COMPANY As a participant in the Mayville Engineering Company, Inc. 401(k) Plan (the "Plan"), you have the right to direct Principal Trust Company, as trustee for Company stock held in the Plan (the "Trustee"), to vote the shares of Company stock allocated to your Plan account as of February 17, 2023, at the Annual Meeting of Shareholders to be held on April 18, 2023, or any adjournment or postponement thereof. \*\*Broadridge Financial Solutions, Inc. ("Broadridge"), as agent for the Trustees, will hold your voting instructions in confidence and will not divulge or release specific information regarding your instructions to officers or employees of the Company, except to the extent required by law. The shares of Company stock allocated to your Plan account will be voted as directed. If no direction is made or if your completed proxy card is not received by Broadridge by April 13, 2023, the Trustee will vote the shares allocated to your Plan account in its sole discretion (ESOP) or as directed by the Plan sponsor, which is the Company (401(k) Plan). CONTINUED AND TO BE SIGNED ON REVERSE SIDE |

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