WESTLAKE CHEM CORP

Ticker: WLK CUSIP: 960413102 Class: Common Stock

DRIEHAUS CAPITAL MANAGEMENT LLC's Holding History (CIK: 0000938206)

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

Q4 2017

Shares 9,480 Value ($000) $1,010 Avg Close $81.78 Range $72.56 - $95.02

Q3 2017

Shares 8,558 Value ($000) $711 Avg Close $64.66 Range $57.52 - $74.59

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2017	9,480	$1,010	$81.78	$72.56 - $95.02
Q3 2017	8,558	$711	$64.66	$57.52 - $74.59