Sean P. Leuba - 06 Mar 2025 Form 4 Insider Report for Mayville Engineering Company, Inc. (MEC)

Role: SVP, Corp. Development & GC
Signature: /s/ Russell E. Ryba, Attorney-in-Fact for Sean P. Leuba
Issuer symbol: MEC
Transactions as of: 06 Mar 2025
Net transactions value: +$14,179
Form type: 4
Filing time: 07 Mar 2025, 17:07:21 UTC
Previous filing: 04 Mar 2025
Next filing: 18 Mar 2025
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MEC	Common Stock	Purchase	$14,179	+1,000	+100%	$14.18	2,000	06 Mar 2025	by ESOP and/or 401(k) Plan	F1
holding	MEC	Common Stock						14,492	06 Mar 2025	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						21,790	06 Mar 2025	Common Stock	21,790	$0.000000	Direct	F2
holding	MEC	Stock Option (right to buy)						21,552	06 Mar 2025	Common Stock	21,552	$16.22	Direct	F3

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