MAYVILLE ENGR CO INC

Ticker: MEC CUSIP: 578605107 Class: Common Stock

GROUP ONE TRADING, L.P.'s Holding History (CIK: 0000932540)

Note: Option positions (PUT/CALL) are excluded.

Q1 2025

Shares 400 Value ($000) $5 Avg Close $15.04 Range $12.75 - $16.54

Q4 2024

Shares 400 Value ($000) $6 Avg Close $18.28 Range $15.33 - $23.02

Q3 2024

Shares 137 Value ($000) $3 Avg Close $18.72 Range $15.90 - $22.07

Q4 2023

Shares 10,542 Value ($000) $152 Avg Close $12.41 Range $9.72 - $14.89

Q3 2023

Shares 11,059 Value ($000) $121 Avg Close $11.55 Range $9.86 - $13.28

Q2 2023

Shares 13,866 Value ($000) $173 Avg Close $12.64 Range $9.55 - $15.50

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2025	400	$5	$15.04	$12.75 - $16.54
Q4 2024	400	$6	$18.28	$15.33 - $23.02
Q3 2024	137	$3	$18.72	$15.90 - $22.07
Q4 2023	10,542	$152	$12.41	$9.72 - $14.89
Q3 2023	11,059	$121	$11.55	$9.86 - $13.28
Q2 2023	13,866	$173	$12.64	$9.55 - $15.50