BUTZ TODD M (Chief Financial Officer) exercised options at MAYVILLE ENGINEERING COMPANY, INC.

Option exercise — a mechanical event triggered by vesting or expiry. Not a discretionary conviction trade.

M · 1 exercise

BUTZ TODD M

Filed: 3/18/2025ACC: 0000897069-25-000636

InsiderBUTZ TODD MCIK 1775975

→

IssuerMAYVILLE ENGINEERING COMPANY, INC.CIK 1766368

Officer· Chief Financial Officer

Since May 2019

-5.64K

Net shares

Net seller

$80.9K

Total sold

Open market trades

0B · 0S

Total transactions

17.61K acquired · 23.25K disposed

Non-Derivative Transactions2

Common Stock

Direct

M · Option Exercise

+17.61K

Price / share

—

Trade value

—

% of position

10.9%

3/15/2025

161.77K→179.38K

Common Stock

Direct

F · Tax Withholding

−5.64K

Price / share

$14.35

Trade value

$80.89K

% of position

3.1%

3/15/2025

179.38K→173.74K

Total

Net shares

+11.98K

Net value

-$80.89K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	3/15/2025	M · Option Exercise	+17.61K	—	—	10.9%	161.77K	179.38K
Common Stock Direct	3/15/2025	F · Tax Withholding	−5.64K	$14.35	$80.89K	3.1%	179.38K	173.74K
Total			+11.98K		-$80.89K

Derivative Transactions1

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

17.61K shares

−17.61K

Strike price

Held after

35.23K

Exercisable

—

3/15/2025

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Restricted Stock Units Direct	Common Stock17.61K shares	3/15/2025	M · Option Exercise	−17.61K	0	—	35.23K

Non-Derivative Holdings (Post-Transaction)1

Common Stock

Indirect

Shares owned41K

Total

41K indirect41K

Security Title	Shares Owned	Ownership Type
Common Stock	41K	Indirect
Total	41K	41K indirect

Derivative Holdings (Post-Transaction)4

Stock Option (right to buy)

Direct

Underlying security

Common Stock

Underlying shares

69.96K

Shares owned

69.96K

Exercise price

10.32

Expiration

—

Exercise window

—

Stock Option (right to buy)

Direct

Underlying security

Common Stock

Underlying shares

39.13K

Shares owned

39.13K

Exercise price

Expiration

—

Exercise window

—

Stock Option (right to buy)

Direct

Underlying security

Common Stock

Underlying shares

39.68K

Shares owned

39.68K

Exercise price

14.01

Expiration

—

Exercise window

—

Stock Option (right to buy)

Direct

Underlying security

Common Stock

Underlying shares

40.41K

Shares owned

40.41K

Exercise price

16.22

Expiration

—

Exercise window

—

Total

Underlying

189.18K

Owned

189.18K

Security	Underlying	Exercise Price	Exercise Window	Expiration	Underlying Shares	Shares Owned
Stock Option (right to buy) Direct	Common Stock	10.32	—	—	69.96K	69.96K
Stock Option (right to buy) Direct	Common Stock	17	—	—	39.13K	39.13K
Stock Option (right to buy) Direct	Common Stock	14.01	—	—	39.68K	39.68K
Stock Option (right to buy) Direct	Common Stock	16.22	—	—	40.41K	40.41K
Total					189.18K	189.18K