Mayville Engineering SVP sells 12,855 shares

Q: What insider stock sale did MEC executive Sean P. Leuba report?

Sean P. Leuba reported selling 12,855 shares of Mayville Engineering Common Stock on August 6, 2026 at a weighted average price of 25.4400 per share, in open-market or private transactions, as indicated by the Form 4 transaction code "S."

Q: At what prices were the MEC shares sold by Sean P. Leuba?

The reported weighted average sale price was 25.4400 per share. According to the footnote, individual trade prices ranged from 25.26 to 25.46 per share, and detailed trade breakdowns are available from the reporting person upon request.

Q: What restricted stock units linked to MEC does Sean P. Leuba hold?

Sean P. Leuba holds restricted stock units covering 7,263, 9,292, and 13,498 underlying shares of Mayville Engineering Common Stock. These RSU grants vest in equal one-third installments on specified March 15 dates between 2025 and 2029, as disclosed in the footnotes.

Q: What stock options in MEC Common Stock does Sean P. Leuba report?

He reports stock options over 21,552 underlying shares of Mayville Engineering Common Stock with an exercise price of 16.2200 per share, expiring on February 28, 2033. The options vest 50% on each of February 28, 2024 and February 28, 2025.

Q: Was Sean P. Leuba’s MEC stock sale under a Rule 10b5-1 plan?

The Form 4 indicates the Rule 10b5-1 checkbox is not affirmed for this filing. No footnote describes the sale as pursuant to a pre-arranged trading plan, so the transaction is reported without an associated Rule 10b5-1 plan designation.

Accepted by SEC EDGAR 08/07/2026 - 04:56 PM EDT

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Rhea-AI Filing Summary

Mayville Engineering Company, Inc. executive Sean P. Leuba, SVP, GC & Secretary, reported selling 12,855 shares of Common Stock on August 6, 2026 at a weighted average price of 25.4400, with prices ranging from 25.26 to 25.46, leaving 6,633 shares directly held and additional equity in restricted stock units and stock options.

Insider Trade Summary

Net Seller: 12,855 shares

Net Sell 1 txn

Insider Leuba Sean P

Role SVP, GC & Secretary

Sold 12,855 shs ($327K)

Share of Position Sold 66.0%

Type	Security	Shares	Price	Value
Sale	Common Stock ^F1	12,855	$25.44	$327K
Holding	Restricted Stock Units ^F2	--	--	--
Holding	Restricted Stock Units ^F3	--	--	--
Holding	Restricted Stock Units ^F4	--	--	--
Holding	Stock Option (right to buy) ^F5	--	--	--

Holdings After Transaction: Common Stock — 6,633 shares (Direct); Restricted Stock Units — 30,053 contracts (Direct); Stock Option (right to buy) — 21,552 contracts (Direct)

Holdings Before and After: Common Stock, 19,488 to 6,633 shares (Direct)

Footnotes (5)

F1. The price in Column 4 is a weighted average price. The prices actually received ranged from $25.26 to $25.46. The reporting person has provided to the issuer, and will provide to any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range for all transactions reported in this Form 4 utilizing a weighted average price.
F2. The restricted stock units will vest 1/3 on each of March 15, 2025, 2026 and 2027.
F3. The restricted stock units will vest 1/3 on each of March 15, 2026, 2027 and 2028.
F4. The restricted stock units will vest 1/3 on each of March 15, 2027, 2028 and 2029.
F5. The options will vest 50% on each of February 28, 2024 and February 28, 2025.

Key Figures

Shares sold: 12855.0000 shares Weighted average sale price: 25.4400 Shares held after sale: 6633.0000 shares +5 more

8 metrics

Shares sold 12855.0000 shares Common Stock sale by Sean P. Leuba on 2026-08-06

Weighted average sale price 25.4400 Weighted average price for the 12,855 shares sold; prices ranged from 25.26 to 25.46

Shares held after sale 6633.0000 shares Directly owned Common Stock following the reported sale

RSU underlying shares grant 1 7263.0000 shares Restricted stock units vesting 1/3 on March 15, 2025, 2026 and 2027

RSU underlying shares grant 2 9292.0000 shares Restricted stock units vesting 1/3 on March 15, 2026, 2027 and 2028

RSU underlying shares grant 3 13498.0000 shares Restricted stock units vesting 1/3 on March 15, 2027, 2028 and 2029

Stock option underlying shares 21552.0000 shares Stock options exercisable at 16.2200, expiring 2033-02-28

Stock option exercise price 16.2200 Exercise price per share for 21,552 stock options held by Sean P. Leuba

Key Terms

weighted average price, Restricted Stock Units, Stock Option (right to buy), vest

4 terms

weighted average price financial

"The price in Column 4 is a weighted average price. The prices actually received ranged"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

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.

Stock Option (right to buy) financial

"Stock Option (right to buy) with an exercise price of 16.2200 and expiration date 2033-02-28"

vest financial

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

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 stock sale did MEC executive Sean P. Leuba report?

Sean P. Leuba reported selling 12,855 shares of Mayville Engineering Common Stock on August 6, 2026 at a weighted average price of 25.4400 per share, in open-market or private transactions, as indicated by the Form 4 transaction code "S."

At what prices were the MEC shares sold by Sean P. Leuba?

The reported weighted average sale price was 25.4400 per share. According to the footnote, individual trade prices ranged from 25.26 to 25.46 per share, and detailed trade breakdowns are available from the reporting person upon request.

How many MEC shares does Sean P. Leuba hold after the reported sale?

After the August 6, 2026 sale, Sean P. Leuba directly holds 6,633 shares of Mayville Engineering Common Stock. This position is in addition to his reported holdings of restricted stock units and stock options tied to additional shares of Common Stock.

What restricted stock units linked to MEC does Sean P. Leuba hold?

Sean P. Leuba holds restricted stock units covering 7,263, 9,292, and 13,498 underlying shares of Mayville Engineering Common Stock. These RSU grants vest in equal one-third installments on specified March 15 dates between 2025 and 2029, as disclosed in the footnotes.

What stock options in MEC Common Stock does Sean P. Leuba report?

He reports stock options over 21,552 underlying shares of Mayville Engineering Common Stock with an exercise price of 16.2200 per share, expiring on February 28, 2033. The options vest 50% on each of February 28, 2024 and February 28, 2025.

Was Sean P. Leuba’s MEC stock sale under a Rule 10b5-1 plan?

The Form 4 indicates the Rule 10b5-1 checkbox is not affirmed for this filing. No footnote describes the sale as pursuant to a pre-arranged trading plan, so the transaction is reported without an associated Rule 10b5-1 plan designation.

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

Form 4 Insider Transactions: What Each Field Means →

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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)
08/06/2026

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	08/06/2026		S		12,855	D	$25.44⁽¹⁾	6,633	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							⁽²⁾	⁽²⁾	Common Stock	7,263		7,263	D
Restricted Stock Units	$0							⁽³⁾	⁽³⁾	Common Stock	9,292		9,292	D
Restricted Stock Units	$0							⁽⁴⁾	⁽⁴⁾	Common Stock	13,498		13,498	D
Stock Option (right to buy)	$16.22							⁽⁵⁾	02/28/2033	Common Stock	21,552		21,552	D

Explanation of Responses:

1. The price in Column 4 is a weighted average price. The prices actually received ranged from $25.26 to $25.46. The reporting person has provided to the issuer, and will provide to any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range for all transactions reported in this Form 4 utilizing a weighted average price.

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 February 28, 2024 and February 28, 2025.

	/s/ Garrett F. Bishop, Attorney-in-Fact for Sean P. Leuba	08/07/2026
	** 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