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

Insider Trade Summary

32,051 shares exercised/converted

Exercise 8 txns

Insider Reddy Jagadeesh A

Role President & CEO

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	32,051	$0.00	$0.00
Exercise	Common Stock	32,051	$0.00	$0.00
Exercise Price or Tax Liability	Common Stock	15,064	$15.30	$230K
holding	Restricted Stock Units	--	--	--
holding	Restricted Stock Units	--	--	--
holding	Stock Option (right to buy)	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Restricted Stock Units — 155,560 contracts (Direct); Common Stock — 138,785 shares (Direct); Stock Option (right to buy) — 88,901 contracts (Direct); Common Stock — 2,300 shares (Indirect, by ESOP and/or 401(k) Plan); Common Stock — 380 shares (Indirect, By Daughter)

Footnotes (5)

1. F1. Reflects the most recent ESOP and 401(k) balance.
2. F2. The restricted stock units will vest 1/3 on each of July 19, 2023, 2024 and 2025.
3. F3. The restricted stock units will vest 1/3 on each of March 15, 2025, 2026 and 2027.
4. F4. The restricted stock units will vest 1/3 on each of March 15, 2026, 2027 and 2028.
5. F5. The options will vest 50% on each of February 28, 2024 and February 28, 2025.

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Accepted by SEC EDGAR 07/21/2025 - 05:41 PM EDT Learn about SEC filing dates

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

Reddy Jagadeesh A

(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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President & CEO

3. Date of Earliest Transaction (Month/Day/Year)
07/19/2025

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	07/19/2025		M		32,051	A	$0	153,849	D
Common Stock	07/19/2025		F		15,064	D	$15.3	138,785	D
Common Stock								2,300(1)	I	by ESOP and/or 401(k) Plan
Common Stock								380	I	By Daughter

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
Restricted Stock Units	$0	07/19/2025		M			32,051	(2)	(2)	Common Shares	32,051	$0	0	D
Restricted Stock Units	$0							(3)	(3)	Common Shares	72,633		72,633	D
Restricted Stock Units	$0							(4)	(4)	Common Shares	82,927		82,927	D
Stock Option (right to buy)	$16.22							(5)	02/28/2033	Common Shares	88,901		88,901	D

Explanation of Responses:

1. Reflects the most recent ESOP and 401(k) balance.

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

3. The restricted stock units will vest 1/3 on each of March 15, 2025, 2026 and 2027.

4. The restricted stock units will vest 1/3 on each of March 15, 2026, 2027 and 2028.

5. The options will vest 50% on each of February 28, 2024 and February 28, 2025.

	/s/ Russell E. Ryba, Attorney-in-Fact for Jagadeesh A. Reddy	07/21/2025
	** 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.