Mayville Engineering Company, Inc.

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 Sean P. Leuba, General Counsel, Mayville Engineering Company, Inc., at (414) 381-2860 or 135 S. 84th Street, Milwaukee, Wisconsin 53214.