Sean P. Leuba - 05 Mar 2026 Form 4 Insider Report for Mayville Engineering Company, Inc. (MEC)

Role
GC & Secretary
Signature
/s/ Garrett F. Bishop, Attorney-in-Fact for Sean P. Leuba
Issuer symbol
MEC
Transactions as of
05 Mar 2026
Net transactions value
-$176,164
Form type
4
Filing time
09 Mar 2026, 16:22:24 UTC
Previous filing
11 Aug 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Leuba Sean P GC & Secretary 135 SOUTH 84TH STREET, SUITE 300, MILWAUKEE /s/ Garrett F. Bishop, Attorney-in-Fact for Sean P. Leuba 09 Mar 2026 0001962754

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MEC Common Stock Sale $50,175 -2,500 -100% $20.07 0 05 Mar 2026 by ESOP and/or 401(k) Plan F1
transaction MEC Common Stock Sale $125,989 -6,698 -36% $18.81 11,841 05 Mar 2026 Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
holding MEC Restricted Stock Units 14,526 05 Mar 2026 Common Stock 14,526 $0.000000 Direct F2
holding MEC Restricted Stock Units 13,938 05 Mar 2026 Common Stock 13,938 $0.000000 Direct F3
holding MEC Stock Option (right to buy) 21,552 05 Mar 2026 Common Stock 21,552 $16.22 Direct F4
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Reflects the most recent ESOP and 401(k) balance.
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 options will vest 50% on each of February 28, 2024 and February 28, 2025.