WESTLAKE CHEM CORP

Ticker: WLK CUSIP: 960413102 Class: Common Stock

GRANDFIELD & DODD, LLC's Holding History (CIK: 0001308016)

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

Q1 2015

Shares 4,525 Value ($000) $326 Avg Close $54.56 Range $46.07 - $62.01

Q4 2014

Shares 8,925 Value ($000) $545 Avg Close $57.80 Range $45.45 - $73.16

Q3 2014

Shares 91,312 Value ($000) $7,907 Avg Close $76.69 Range $70.51 - $83.52

Q2 2014

Shares 96,906 Value ($000) $8,117 Avg Close $63.36 Range $52.18 - $72.01

Q1 2014

Shares 99,706 Value ($000) $6,599 Avg Close $53.68 Range $48.11 - $58.70

Q4 2013

Shares 50,093 Value ($000) $6,115 Avg Close $47.34 Range $43.59 - $51.55

Q3 2013

Shares 50,323 Value ($000) $5,267 Avg Close $42.90 Range $40.28 - $45.40

Q2 2013

Shares 50,388 Value ($000) $4,858 Avg Close $37.72 Range $32.17 - $41.82

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2015	4,525	$326	$54.56	$46.07 - $62.01
Q4 2014	8,925	$545	$57.80	$45.45 - $73.16
Q3 2014	91,312	$7,907	$76.69	$70.51 - $83.52
Q2 2014	96,906	$8,117	$63.36	$52.18 - $72.01
Q1 2014	99,706	$6,599	$53.68	$48.11 - $58.70
Q4 2013	50,093	$6,115	$47.34	$43.59 - $51.55
Q3 2013	50,323	$5,267	$42.90	$40.28 - $45.40
Q2 2013	50,388	$4,858	$37.72	$32.17 - $41.82