MEC insider reports 1,015-share stock gift

Mayville Engineering Company, Inc. senior vice president, general counsel and secretary Sean P. Leuba reported a bona fide gift of 1,015 shares of common stock on May 8, 2026.

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Form Type

Rhea-AI Filing Summary

Mayville Engineering Company, Inc. senior vice president, general counsel and secretary Sean P. Leuba reported a bona fide gift of 1,015 shares of common stock on May 8, 2026. After the gift, he directly holds 19,488 common shares.

He also holds a stock option linked to 21,552 common shares at an exercise price of $16.22 per share, expiring February 28, 2033. In addition, he has multiple restricted stock unit awards covering 13,498, 9,292 and 7,263 underlying shares of common stock, which vest in equal annual installments on specified March 15 vesting dates from 2025 through 2029.

Insider Trade Summary

1,015 shares gifted

Gift 5 txns

Insider Leuba Sean P

Role SVP, GC & Secretary

Type	Security	Shares	Price	Value
Gift	Common Stock	1,015	$0.00	$0.00
holding	Restricted Stock Units	--	--	--
holding	Restricted Stock Units	--	--	--
holding	Restricted Stock Units	--	--	--
holding	Stock Option (right to buy)	--	--	--

Holdings After Transaction: Common Stock — 19,488 shares (Direct); Restricted Stock Units — 30,053 contracts (Direct); Stock Option (right to buy) — 21,552 contracts (Direct)

Footnotes (4)

F1. The restricted stock units will vest 1/3 on each of March 15, 2025, 2026 and 2027.
F2. The restricted stock units will vest 1/3 on each of March 15, 2026, 2027 and 2028.
F3. The restricted stock units will vest 1/3 on each of March 15, 2027, 2028 and 2029.
F4. The options will vest 50% on each of February 28, 2024 and February 28, 2025.

Key Figures

Gifted shares: 1,015 shares Post-gift common shares: 19,488 shares Option underlying shares: 21,552 shares +4 more

7 metrics

Gifted shares 1,015 shares Bona fide gift of common stock on May 8, 2026

Post-gift common shares 19,488 shares Direct common stock holdings after gift

Option underlying shares 21,552 shares Stock option on common stock expiring February 28, 2033

Option exercise price $16.22 per share Exercise price for 21,552-share stock option

RSU grant 1 13,498 shares RSUs vesting one-third on March 15, 2025, 2026 and 2027

RSU grant 2 9,292 shares RSUs vesting one-third on March 15, 2026, 2027 and 2028

RSU grant 3 7,263 shares RSUs vesting one-third on March 15, 2027, 2028 and 2029

Key Terms

Restricted Stock Units, bona fide gift, Stock Option (right to buy), vest

4 terms

Restricted Stock Units financial

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

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

bona fide gift financial

"transaction_code_description: "Bona fide gift" for the 1,015-share common stock transfer."

A bona fide gift is a genuine, voluntary transfer of money, property, or benefits from one party to another made without expectation of repayment, services, or hidden conditions. Investors care because such gifts can affect company disclosures, related‑party transaction rules, tax treatment, and perceived conflicts of interest; think of it like someone giving you a present with no strings attached — but on a corporate scale, auditors and regulators need to verify it really is unconditional.

Stock Option (right to buy) financial

"security_title: "Stock Option (right to buy)" with a $16.22 exercise price."

vest financial

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

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did MEC executive Sean P. Leuba report on this Form 4?

Sean P. Leuba reported a bona fide gift of 1,015 shares of Mayville Engineering common stock. This non-cash disposition transfers ownership without sale proceeds and reflects a personal transfer rather than a market trade in MEC shares.

How many Mayville Engineering (MEC) common shares does Sean P. Leuba hold after the gift?

After the reported gift, Sean P. Leuba directly holds 19,488 shares of Mayville Engineering common stock. This share count appears in the post-transaction balance column for the non-derivative holdings on the Form 4 dated May 8, 2026.

What stock options does MEC executive Sean P. Leuba hold according to this filing?

Sean P. Leuba holds a stock option covering 21,552 shares of Mayville Engineering common stock at a $16.22 exercise price. The option vests 50% on February 28, 2024 and 50% on February 28, 2025, and expires on February 28, 2033.

What restricted stock units (RSUs) are reported for Sean P. Leuba at MEC?

He holds RSU awards tied to 13,498, 9,292 and 7,263 underlying shares of Mayville Engineering common stock. These RSUs vest in one-third installments on March 15 dates spanning 2025 to 2029, as described in the accompanying footnotes.

Does this MEC Form 4 show any open-market buys or sells by Sean P. Leuba?

The Form 4 does not report any open-market purchases or sales. It shows a bona fide gift of 1,015 common shares and several derivative and RSU holdings, with no transactions marked as open-market buys or sells.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 05/12/2026 - 05:49 PM EDT

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).

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^*

Leuba Sean P

(Last)

(First)

(Middle)

135 SOUTH 84TH STREET

SUITE 300

(Street)

MILWAUKEE

WISCONSIN

53214

(City)

(State)

(Zip)

UNITED STATES

(Country)

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)
	SVP, GC & Secretary

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/08/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/08/2026		G	V	1,015	A	$0	19,488	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Stock Units	$0							⁽¹⁾	⁽¹⁾	Common Stock	7,263		7,263	D
Restricted Stock Units	$0							⁽²⁾	⁽²⁾	Common Stock	9,292		9,292	D
Restricted Stock Units	$0							⁽³⁾	⁽³⁾	Common Stock	13,498		13,498	D
Stock Option (right to buy)	$16.22							⁽⁴⁾	02/28/2033	Common Stock	21,552		21,552	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.

	/s/ Garrett F. Bishop, Attorney-in-Fact for Sean P. Leuba	05/12/2026
	** 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).
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.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR