WESTLAKE CHEM CORP

Ticker: WLK CUSIP: 960413102 Class: Common Stock

Portolan Capital Management, LLC's Holding History (CIK: 0001350290)

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

Q4 2014

Shares 21,990 Value ($000) $1,343 Avg Close $57.80 Range $45.45 - $73.16

Q1 2014

Shares 19,031 Value ($000) $1,259 Avg Close $53.68 Range $48.11 - $58.70

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2014	21,990	$1,343	$57.80	$45.45 - $73.16
Q1 2014	19,031	$1,259	$53.68	$48.11 - $58.70