Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * Raber Ryan F 2. Issuer Name and Ticker or Trading Symbol Mayville Engineering Company, Inc. [MEC] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) EVP - Strategy, Sales & Mktg (Last) (First) (Middle) 135 SOUTH 84TH STREET, SUITE 300 3. Date of Earliest Transaction (Month/Day/Year) 05/26/2026 (Street) MILWAUKEE, WI 53214 4. If Amendment, Date Original Filed (Month/Day/Year) 6. Individual or Joint/Group Filing (Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 05/26/2026 S 20,000 D $26 86,970 D Common Stock 26,287(1) I by ESOP and/or 401(k) Plan

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Underlying Securities (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (right to buy)	$17							(2)	05/08/2029	Common Stock	27,595		27,595	D
Stock Option (right to buy)	$14.01							(3)	02/28/2031	Common Stock	43,291		43,291	D
Stock Option (right to buy)	$10.32							(4)	02/28/2032	Common Stock	77,426		77,426	D
Stock Option (right to buy)	$16.22							(5)	02/28/2033	Common Stock	44,720		44,720	D
Restricted Stock Units	$ 0							(6)	(6)	Common Stock	17,650		17,650	D
Restricted Stock Units	$ 0							(7)	(7)	Common Stock	12,452		12,452	D
Restricted Stock Units	$ 0							(8)	(8)	Common Stock	29,155		29,155	D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Raber Ryan F 135 SOUTH 84TH STREET SUITE 300 MILWAUKEE, WI 53214			EVP - Strategy, Sales & Mktg

Signatures

/s/ Garrett F. Bishop, Attorney-in-Fact for Ryan F. Raber		05/27/2026
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Reflects the most recent ESOP and 401(k) balance.
(2)	The options will vest 50% on each of May 8, 2020 and May 8, 2021.
(3)	The options will vest 50% on each of February 28, 2022 and February 28, 2023.
(4)	The options will vest 50% on each of February 28, 2023 and February 28, 2024.
(5)	The options will vest 50% on each of February 28, 2024 and February 28, 2025.
(6)	The restricted stock units will vest 1/3 on each of March 15, 2025, 2026 and 2027.
(7)	The restricted stock units will vest 1/3 on each of March 15, 2026, 2027 and 2028.
(8)	The restricted stock units will vest 1/3 on each of March 15, 2027, 2028 and 2029.

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