LEUBA SEAN P (GC & Secretary) exercised options at MAYVILLE ENGINEERING COMPANY, INC.

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

M · 2 exercises

LEUBA SEAN P

Filed: 3/17/2026ACC: 0000897069-26-000707

InsiderLEUBA SEAN PCIK 1962754

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IssuerMAYVILLE ENGINEERING COMPANY, INC.CIK 1766368

Officer· GC & Secretary

Since Mar 2026

+8.22K

Net shares

Net buyer

$88.0K

Total sold

Open market trades

0B · 0S

Total transactions

25.41K acquired · 17.19K disposed

Non-Derivative Transactions3

Common Stock

Direct

M · Option Exercise

+7.26K

Price / share

—

Trade value

—

% of position

61.3%

3/15/2026

11.84K→19.10K

Common Stock

Direct

M · Option Exercise

+4.65K

Price / share

—

Trade value

—

% of position

24.3%

3/15/2026

19.10K→23.75K

Common Stock

Direct

F · Tax Withholding

−5.28K

Price / share

$16.67

Trade value

$87.97K

% of position

22.2%

3/15/2026

23.75K→18.47K

Total

Net shares

+6.63K

Net value

-$87.97K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	3/15/2026	M · Option Exercise	+7.26K	—	—	61.3%	11.84K	19.10K
Common Stock Direct	3/15/2026	M · Option Exercise	+4.65K	—	—	24.3%	19.10K	23.75K
Common Stock Direct	3/15/2026	F · Tax Withholding	−5.28K	$16.67	$87.97K	22.2%	23.75K	18.47K
Total			+6.63K		-$87.97K

Derivative Transactions3

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

7.26K shares

−7.26K

Strike price

Held after

7.26K

Exercisable

—

3/15/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

4.65K shares

−4.65K

Strike price

Held after

9.29K

Exercisable

—

3/15/2026

Restricted Stock Units

Direct

A · Award

Converts to

Common Stock

13.50K shares

+13.50K

Strike price

Held after

13.50K

Exercisable

—

3/15/2026

Security	Converts To	Date	Type	Shares	Exercisable	Held After
Restricted Stock Units Direct	Common Stock7.26K shares	3/15/2026	M · Option Exercise	−7.26K	—	7.26K
Restricted Stock Units Direct	Common Stock4.65K shares	3/15/2026	M · Option Exercise	−4.65K	—	9.29K
Restricted Stock Units Direct	Common Stock13.50K shares	3/15/2026	A · Award	+13.50K	—	13.50K

Non-Derivative Holdings (Post-Transaction)0

No non-derivative holdings reported

Derivative Holdings (Post-Transaction)1

Stock Option (right to buy)

Direct

Underlying security

Common Stock

Underlying shares

21.55K

Shares owned

21.55K

Exercise price

16.22

Expiration

—

Exercise window

—

Total

Underlying

21.55K

Owned

21.55K

Security	Underlying	Exercise Price	Exercise Window	Expiration	Underlying Shares	Shares Owned
Stock Option (right to buy) Direct	Common Stock	16.22	—	—	21.55K	21.55K
Total					21.55K	21.55K