NEWMARKET CORP

Ticker: NEU CUSIP: 651587107 Class: Common Stock

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

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

Q4 2025

Shares 60 Value ($000) $41 Avg Close $760.94 Range $681.51 - $872.48

Q3 2025

Shares 60 Value ($000) $50 Avg Close $765.22 Range $638.93 - $848.55

Q3 2023

Shares 7 Value ($000) $3 Avg Close $432.54 Range $384.81 - $455.58

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	60	$41	$760.94	$681.51 - $872.48
Q3 2025	60	$50	$765.22	$638.93 - $848.55
Q3 2023	7	$3	$432.54	$384.81 - $455.58