WESTLAKE CHEM CORP

Ticker: WLK CUSIP: 960413102 Class: Common Stock

Summit Trail Advisors, LLC's Holding History (CIK: 0001698478)

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

Q4 2025

Shares 15,561 Value ($000) $1,151 Avg Close $70.79 Range $55.84 - $82.75

Q3 2025

Shares 13,170 Value ($000) $1,015 Avg Close $82.33 Range $73.94 - $91.41

Q2 2025

Shares 4,508 Value ($000) $342 Avg Close $80.28 Range $67.52 - $99.92

Q4 2017

Shares 77 Value ($000) $9 Avg Close $81.78 Range $72.56 - $95.02

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	15,561	$1,151	$70.79	$55.84 - $82.75
Q3 2025	13,170	$1,015	$82.33	$73.94 - $91.41
Q2 2025	4,508	$342	$80.28	$67.52 - $99.92
Q4 2017	77	$9	$81.78	$72.56 - $95.02