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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of

the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): June 26, 2025

Mayville Engineering Company, Inc.

(Exact name of registrant as specified in its charter)

(414) 381-2860

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company    ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.      ☐

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On June 26, 2025, Mayville Engineering Company, Inc. (the “Company”) entered into the First Amendment (the “First Amendment”) to its Amended and Restated Credit Agreement, dated as of June 28, 2023, by and among Mayville Engineering Company, Inc., certain subsidiaries of Mayville Engineering Company, as guarantors, the lenders from time-to-time party thereto, and Wells Fargo Bank, National Association, as Administrative Agent for the lenders (as amended by the First Amendment, the “Amended and Restated Credit Agreement”). The First Amendment increased the amount of total allowable borrowings under the revolving credit facility to $350 million from $250 million, by exercising the previously available $100 million accordion feature, among other things. All other material terms of the credit agreement, including applicable interest rates, remain unchanged.

The increase in the amount of the revolving credit facility under the Amended and Restated Credit Agreement will be used to support the ongoing needs of the Company’s business.

Certain lender parties to the Amended and Restated Credit Agreement and certain of their respective affiliates have performed in the past, and may from time to time perform in the future, commercial banking, investment banking and other financial advisory services for the Company and its affiliates for which they have received, and/or will receive, customary fees and expenses.

The foregoing description of the First Amendment to the Amended and Restated Credit Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the First Amendment, and the Amended and Restated Credit Agreement, a copy of which is attached hereto as Exhibit 10 and incorporated herein by reference.

The information set forth under Item 1.01 of this Current Report on Form 8-K is incorporated herein by reference.

Item 9.01.Financial Statements and Exhibits.

(a)Not applicable.

(b)Not applicable.

(c)Not applicable.

(d)Exhibits. The exhibits listed in the exhibit index below are being filed herewith.

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EXHIBIT INDEX

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SIGNATURES

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Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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