Mayville (NYSE: MEC) EVP exercises RSUs and receives new stock unit grant

Rhea-AI Filing Summary

Mayville Engineering Company EVP Ryan F. Raber reported multiple equity compensation moves on March 15, 2026. He exercised restricted stock units into 30,102 shares of Common Stock in two tranches of 17,650 and 12,452 shares. To cover tax obligations, 14,150 shares of Common Stock were withheld at $16.67 per share, a non-market disposition.

Raber also received a new grant of 29,155 restricted stock units, scheduled to vest in thirds on March 15 of 2027, 2028, and 2029. Following these transactions, he directly holds 106,970 Common shares, plus 26,287 shares indirectly through an ESOP and 401(k) plan. He continues to hold several stock option awards with exercise prices between $10.32 and $17.00 per share and expiration dates from 2029 to 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^*

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)
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		17,650	A	$0	108,668	D
Common Stock	03/15/2026		M		12,452	A	$0	121,120	D
Common Stock	03/15/2026		F		14,150	D	$16.67	106,970	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
Restricted Stock Units	$0	03/15/2026		M			17,650	(2)	(2)	Common Stock	17,650	$0	17,650	D
Restricted Stock Units	$0	03/15/2026		M			12,452	(3)	(3)	Common Stock	12,452	$0	24,901	D
Restricted Stock Units	$0	03/15/2026		A		29,155		(4)	(4)	Common Stock	29,155	$0	29,155	D
Stock Option (right to buy)	$17							(5)	05/08/2029	Common Stock	27,595		27,595	D
Stock Option (right to buy)	$14.01							(6)	02/28/2031	Common Stock	43,291		43,291	D
Stock Option (right to buy)	$10.32							(7)	02/28/2032	Common Stock	77,426		77,426	D
Stock Option (right to buy)	$16.22							(8)	02/28/2033	Common Stock	44,720		44,720	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 March 15, 2025, 2026 and 2027.

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

4. The restricted stock units will vest 1/3 on each of March 15, 2027, 2028 and 2029.

5. The options will vest 50% on each of May 8, 2020 and May 8, 2021.

6. The options will vest 50% on each of February 28, 2022 and February 28, 2023.

7. The options will vest 50% on each of February 28, 2023 and February 28, 2024.

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

	Garrett F. Bishop, Attorney-in-Fact for Ryan F. Raber	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 insider transactions did MEC executive Ryan F. Raber report?

Ryan F. Raber reported exercising restricted stock units into Common Stock and a related tax-withholding share disposition. He also received a new restricted stock unit grant, all dated March 15, 2026, reflecting routine equity compensation activity rather than open-market buying or selling.

How many Mayville Engineering (MEC) shares did Raber acquire through RSU exercises?

Raber acquired 30,102 shares of Mayville Engineering Common Stock by exercising restricted stock units in two tranches of 17,650 and 12,452 shares. These conversions carried a stated exercise price of $0.00 per share, consistent with typical settlement of time-based equity awards.

What tax-withholding transaction did MEC disclose for Ryan F. Raber?

MEC disclosed that 14,150 shares of Common Stock were withheld from Raber at $16.67 per share to satisfy tax obligations. This F-code transaction is a non-market disposition used to pay taxes on equity vesting, not an open-market sale indicating a change in investment view.

What new restricted stock unit award did MEC grant to Ryan F. Raber?

Raber received a grant of 29,155 restricted stock units tied to Mayville Engineering Common Stock. The units vest in three equal installments on March 15, 2027, 2028, and 2029, creating a multi-year incentive aligned with continued service and future company performance.

What are Ryan F. Raber’s reported MEC shareholdings after these transactions?

After the reported activity, Raber holds 106,970 Mayville Engineering Common shares directly and 26,287 shares indirectly via an ESOP and 401(k) plan. He also retains multiple stock option awards on Common Stock with exercise prices from $10.32 to $17.00 and expirations through 2033.

What stock options on MEC shares does Ryan F. Raber still hold?

Raber continues to hold several stock option grants on Mayville Engineering Common Stock. These options have exercise prices between $10.32 and $17.00 per share and expiration dates ranging from 2029 to 2033, indicating a remaining long-term equity exposure through derivative awards.