WESTLAKE CHEM CORP

Ticker: WLK CUSIP: 960413102 Class: Common Stock

CASTLEARK MANAGEMENT LLC's Holding History (CIK: 0001106832)

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

Q1 2017

Shares 50,155 Value ($000) $3,313 Avg Close $55.38 Range $49.25 - $59.68

Q4 2016

Shares 61,220 Value ($000) $3,428 Avg Close $47.64 Range $42.61 - $53.78

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2017	50,155	$3,313	$55.38	$49.25 - $59.68
Q4 2016	61,220	$3,428	$47.64	$42.61 - $53.78