WESTLAKE CHEM CORP

Ticker: WLK CUSIP: 960413102 Class: Common Stock

FIRST INTERSTATE BANK's Holding History (CIK: 0001125727)

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

Q3 2016

Shares 389 Value ($000) $21 Avg Close $41.92 Range $34.93 - $47.03

Q2 2016

Shares 941 Value ($000) $40 Avg Close $39.55 Range $34.26 - $45.64

Q1 2016

Shares 478 Value ($000) $22 Avg Close $39.11 Range $34.33 - $46.52

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2016	389	$21	$41.92	$34.93 - $47.03
Q2 2016	941	$40	$39.55	$34.26 - $45.64
Q1 2016	478	$22	$39.11	$34.33 - $46.52