WESTLAKE CHEM CORP

Ticker: WLK CUSIP: 960413102 Class: Common Stock

Optiver Holding B.V.'s Holding History (CIK: 0001859606)

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

Q3 2025

Shares 83 Value ($000) $6 Avg Close $82.33 Range $73.94 - $91.41

Q2 2025

Shares 96 Value ($000) $7 Avg Close $80.28 Range $67.52 - $99.92

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2025	83	$6	$82.33	$73.94 - $91.41
Q2 2025	96	$7	$80.28	$67.52 - $99.92