MEC (MEC) CFO Lehr exercises 14,368 RSUs, gets 16,497-unit grant

Rhea-AI Filing Summary

Mayville Engineering Company Chief Financial Officer Rachele Marie Lehr reported compensation-related equity transactions. On March 15, 2026, she exercised restricted stock units into 14,368 shares of common stock through two conversions of 8,560 and 5,808 units, at a stated price of $0.00 per unit.

She also received a new grant of 16,497 restricted stock units, which will vest in three equal installments on March 15, 2027, 2028 and 2029. To cover tax obligations, 4,600 shares of common stock were withheld at $16.67 per share.

After these transactions, Lehr directly holds 30,529 shares of common stock and 16,497 restricted stock units. She also has a stock option outstanding for 24,814 shares of common stock at an exercise price of $14.12 per share, expiring on February 28, 2033.

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^*

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)
03/15/2026

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	03/15/2026		M		8,560	A	$0	29,321	D
Common Stock	03/15/2026		M		5,808	A	$0	35,129	D
Common Stock	03/15/2026		F		4,600	D	$16.67	30,529	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	03/15/2026		M			8,560	(1)	(1)	Common Stock	8,560	$0	8,560	D
Restricted Stock Units	$0	03/15/2026		M			5,808	(2)	(2)	Common Stock	5,808	$0	11,614	D
Restricted Stock Units	$0	03/15/2026		A		16,497		(3)	(3)	Common Stock	16,497	$0	16,497	D
Stock Option (right to buy)	$14.12							(4)	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 restricted stock units will vest 1/3 on each of March 15, 2027, 2028 and 2029.

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

	Garrett F. Bishop, Attorney-in-Fact for Rachele M. Lehr	03/17/2026
	** 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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FAQ

What equity transactions did MEC CFO Rachele Lehr report on this Form 4?

Rachele Lehr reported exercising restricted stock units into 14,368 common shares, receiving a new grant of 16,497 restricted stock units, and having 4,600 shares withheld to satisfy tax obligations. These actions reflect compensation and vesting, not open-market trading.

How many Mayville Engineering (MEC) shares does the CFO hold after these transactions?

Following the reported transactions, Rachele Lehr directly holds 30,529 shares of Mayville Engineering common stock. In addition, she owns 16,497 restricted stock units that will convert into shares as they vest over future dates.

What new restricted stock units did MEC grant to its CFO in this filing?

The filing shows a grant of 16,497 restricted stock units to CFO Rachele Lehr. These units are scheduled to vest in three equal annual installments on March 15, 2027, March 15, 2028, and March 15, 2029, subject to continued service.

Why were 4,600 MEC shares disposed of in Rachele Lehr’s Form 4?

The 4,600 shares shown as a disposition were withheld at $16.67 per share to cover tax liabilities related to equity vesting. This is a tax-withholding disposition, not an open-market sale, and is common in stock-based compensation.

What stock options does MEC’s CFO still hold after these transactions?

Rachele Lehr continues to hold a stock option covering 24,814 shares of Mayville Engineering common stock. The option has an exercise price of $14.12 per share and is scheduled to expire on February 28, 2033, according to the filing.

Were any of the MEC CFO’s transactions open-market buys or sells?

No open-market buys or sells are reported. The Form 4 shows derivative exercises, a restricted stock unit grant, and a tax-withholding disposition of 4,600 shares. These are compensation and tax-related events rather than discretionary market trades.