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

Rhea-AI Filing Summary

Rachele M. Lehr, Chief Financial Officer of Mayville Engineering Company (MEC), purchased 1,400 shares of MEC common stock on 08/08/2025 at $14.08 per share, increasing her direct holdings to 20,761 shares. The filing also reports that Ms. Lehr directly beneficially owns restricted stock units (17,120 and 17,422) that vest in staged increments (one grant vests one-third on March 15 of 2025, 2026 and 2027; the other vests one-third on March 15 of 2026, 2027 and 2028).

The report shows a stock option covering 24,814 shares with an exercise price of $14.12 and an expiration date of 02/28/2033; the option vesting schedule was 50% on 02/28/2024 and 50% on 02/28/2025. The transaction reported is a direct purchase and the filing lists the post-transaction and derivative holdings explicitly.

Positive

• CFO executed a direct purchase of 1,400 shares, increasing her reported direct ownership to 20,761 shares.
• Executive holds RSUs and stock options with disclosed vesting schedules and exercise price, aligning compensation with future performance.

Negative

• None.

Insights

Securities Analyst

TL;DR: CFO made a small direct purchase (1,400 shares) and holds RSUs and options, all reported on Form 4.

The purchase on 08/08/2025 at $14.08 equals approximately $19,712 in cash outlay based on the reported price, raising direct common stock holdings to 20,761 shares. The filing separately discloses two restricted stock unit grants (17,120 and 17,422 RSUs) with clear multi-year vesting schedules and a stock option for 24,814 shares at a $14.12 exercise price expiring 02/28/2033. From a reporting and disclosure perspective, the form is complete and provides the core metrics investors and compliance teams track: transaction date, price, post-transaction ownership, and derivative terms.

Corporate Governance Expert

TL;DR: The Form 4 documents routine insider compensation instruments and a modest open-market purchase by the CFO.

The filing lists both compensation-related equity (two RSU grants with staged vesting and an option grant with specified exercise price and expiration) and a contemporaneous direct purchase of 1,400 shares. Vesting schedules and option terms are spelled out, supporting transparency about executive alignment with shareholder value. The filing does not present any regulatory exceptions or irregularities; materiality for investors depends on company size and total outstanding shares, which are not provided in this document.

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
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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).

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^*

Lehr Rachele Marie

(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)
	Chief Financial Officer

3. Date of Earliest Transaction (Month/Day/Year)
08/08/2025

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	08/08/2025		P		1,400	A	$14.08	20,761	D

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							(1)	(1)	Common Stock	17,120		17,120	D
Restricted Stock Units	$0							(2)	(2)	Common Stock	17,422		17,422	D
Stock Option (right to buy)	$14.12							(3)	02/28/2033	Common Stock	24,814		24,814	D

Explanation of Responses:

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

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

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

	/s/ Russell E. Ryba, Attorney-in-Fact for Rachele M. Lehr	08/11/2025
	** 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.

FAQ

What did Mayville Engineering (MEC) CFO Rachele M. Lehr purchase?

She purchased 1,400 shares of MEC common stock on 08/08/2025 at a reported price of $14.08 per share.

How many MEC shares does the CFO own after the reported transaction?

20,761 shares of MEC common stock are reported as beneficially owned directly following the transaction.

What restricted stock units (RSUs) are disclosed in the Form 4 for MEC?

Two RSU grants are reported: 17,120 RSUs vesting one-third on March 15 of 2025, 2026 and 2027, and 17,422 RSUs vesting one-third on March 15 of 2026, 2027 and 2028.

What stock option holdings are reported for MEC's CFO?

A stock option for 24,814 shares is reported with an exercise price of $14.12 and an expiration date of 02/28/2033; vesting was 50% on 02/28/2024 and 50% on 02/28/2025.

What is the reported dollar value of the CFO's purchase on 08/08/2025?

Approximately $19,712, calculated as 1,400 shares at the reported price of $14.08 per share.