Sean P. Leuba - 06 Aug 2026 Form 4 Insider Report for Mayville Engineering Company, Inc. (MEC)

Reporting relationship: SVP, GC & Secretary
Issuer ticker: MEC
Reported as of: 06 Aug 2026
Net transaction value: -$327,031
SEC form: 4
Accepted by SEC: 07 Aug 2026, 16:56:58 UTC
Prior SEC filing: 12 May 2026
Source filing: View source filing
Reporting owner signature: /s/ Garrett F. Bishop, Attorney-in-Fact for Sean P. Leuba

Key filing fact

Sean P. Leuba filed Form 4 for Mayville Engineering Company, Inc. (MEC) on 07 Aug 2026.

Key facts

This page summarizes Sean P. Leuba's Form 4 filing for Mayville Engineering Company, Inc. (MEC).
1 reported transaction and 4 derivative rows are listed below.
Accepted by SEC: 07 Aug 2026, 16:56.

Change

Previous filing in this sequence was filed on 12 May 2026.
Current net transaction value: -$327,031.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001962754 Primary reporting owner

Leuba Sean P

Relationship: SVP, GC & Secretary
Address: 135 SOUTH 84TH STREET, SUITE 300, MILWAUKEE
Signature: /s/ Garrett F. Bishop, Attorney-in-Fact for Sean P. Leuba
Signature date: 07 Aug 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

MEC transaction

Common Stock

Sale

Transaction value: $327,031
Shares: -12,855
Change %: -66%
Price: $25.44
Shares after: 6,633
Date: 06 Aug 2026
Ownership: Direct
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

MEC holding Derivative

Restricted Stock Units

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 7,263
Date: 06 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 7,263
Exercise price: $0.000000
Footnotes: F2

MEC holding Derivative

Restricted Stock Units

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 9,292
Date: 06 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 9,292
Exercise price: $0.000000
Footnotes: F3

MEC holding Derivative

Restricted Stock Units

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 13,498
Date: 06 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 13,498
Exercise price: $0.000000
Footnotes: F4

MEC holding Derivative

Stock Option (right to buy)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 21,552
Date: 06 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 21,552
Exercise price: $16.22
Footnotes: F5

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote 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.

Footnote F2

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

Footnote F3

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

Footnote F4

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

Footnote F5

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