[Form 4] Mayville Engineering Company, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Mayville Engineering Company, Inc. (MEC)

After these transactions, Raber beneficially owns 91,018 MEC shares directly and 26,287 shares indirectly through an ESOP and/or 401(k) plan. He also holds multiple stock option and restricted stock unit awards that provide additional potential exposure to MEC shares over future vesting dates.

11/26/2025 - 04:23 PM

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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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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 for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Raber Ryan F

(Last) (First) (Middle)

135 SOUTH 84TH STREET

SUITE 300

(Street)

MILWAUKEE WI 53214

(City) (State) (Zip)

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

3. Date of Earliest Transaction (Month/Day/Year)
11/25/2025

4. If Amendment, Date of 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

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	11/25/2025		S		12,500	D	$16.69	93,518	D
Common Stock	11/25/2025		S		2,500	D	$16.625	91,018	D
Common Stock								26,287(1)	I	by ESOP and/or 401(k) Plan

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 Securities Underlying Derivative Security (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: 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	35,300		35,300	D
Restricted Stock Units	$0							(7)	(7)	Common Stock	37,353		37,353	D

Explanation of Responses:

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.

	/s/ Russell E. Ryba, Attorney-in-Fact for Ryan F. Raber	11/26/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
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