DUCOMMUN INC DEL

Ticker: DCO CUSIP: 264147109 Class: COM

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

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

Q4 2025

Shares 100 Value ($000) $10 Avg Close $93.15 Range $84.76 - $101.47

Q1 2015

Shares 215 Value ($000) $6 Avg Close $25.89 Range $23.50 - $27.88

Q4 2014

Shares 215 Value ($000) $5 Avg Close $25.84 Range $23.52 - $29.54

Q4 2013

Shares 305 Value ($000) $9 Avg Close $27.17 Range $24.17 - $30.98

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	100	$10	$93.15	$84.76 - $101.47
Q1 2015	215	$6	$25.89	$23.50 - $27.88
Q4 2014	215	$5	$25.84	$23.52 - $29.54
Q4 2013	305	$9	$27.17	$24.17 - $30.98