WESTLAKE CHEM CORP

Ticker: WLK CUSIP: 960413102 Class: Common Stock

Aperio Group, LLC's Holding History (CIK: 0001364615)

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

Q4 2020

Shares 47,571 Value ($000) $3,882 Avg Close $68.91 Range $56.02 - $78.45

Q3 2020

Shares 47,118 Value ($000) $2,979 Avg Close $54.23 Range $46.16 - $63.35

Q2 2020

Shares 49,493 Value ($000) $2,655 Avg Close $42.05 Range $30.99 - $55.36

Q1 2020

Shares 50,559 Value ($000) $1,930 Avg Close $51.06 Range $26.40 - $65.18

Q4 2019

Shares 21,192 Value ($000) $1,487 Avg Close $60.78 Range $52.18 - $68.35

Q3 2019

Shares 19,992 Value ($000) $1,310 Avg Close $57.99 Range $50.43 - $64.27

Q2 2019

Shares 29,618 Value ($000) $2,057 Avg Close $59.69 Range $51.40 - $69.93

Q1 2019

Shares 38,945 Value ($000) $2,643 Avg Close $64.77 Range $57.75 - $72.34

Q4 2018

Shares 39,255 Value ($000) $2,598 Avg Close $64.35 Range $53.36 - $76.44

Q3 2018

Shares 18,038 Value ($000) $1,499 Avg Close $86.83 Range $72.82 - $100.10

Q2 2018

Shares 18,395 Value ($000) $1,980 Avg Close $99.34 Range $90.39 - $110.06

Q1 2018

Shares 18,131 Value ($000) $2,015 Avg Close $98.39 Range $86.89 - $107.41

Q4 2017

Shares 18,607 Value ($000) $1,982 Avg Close $81.78 Range $72.56 - $95.02

Q3 2017

Shares 17,650 Value ($000) $1,467 Avg Close $64.66 Range $57.52 - $74.59

Q2 2017

Shares 16,836 Value ($000) $1,115 Avg Close $55.73 Range $52.23 - $59.49

Q1 2017

Shares 10,650 Value ($000) $703 Avg Close $55.38 Range $49.25 - $59.68

Q4 2016

Shares 11,267 Value ($000) $631 Avg Close $47.64 Range $42.61 - $53.78

Q3 2016

Shares 14,664 Value ($000) $785 Avg Close $41.92 Range $34.93 - $47.03

Q2 2016

Shares 5,750 Value ($000) $247 Avg Close $39.55 Range $34.26 - $45.64

Q1 2016

Shares 6,263 Value ($000) $290 Avg Close $39.11 Range $34.33 - $46.52

Q4 2015

Shares 23,510 Value ($000) $1,277 Avg Close $49.75 Range $44.01 - $54.52

Q3 2015

Shares 15,402 Value ($000) $799 Avg Close $49.96 Range $42.26 - $59.13

Q2 2015

Shares 6,520 Value ($000) $447 Avg Close $62.10 Range $58.06 - $67.58

Q1 2015

Shares 5,022 Value ($000) $361 Avg Close $54.56 Range $46.07 - $62.01

Q3 2014

Shares 4,147 Value ($000) $359 Avg Close $76.69 Range $70.51 - $83.52

Q2 2014

Shares 4,238 Value ($000) $355 Avg Close $63.36 Range $52.18 - $72.01

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2020	47,571	$3,882	$68.91	$56.02 - $78.45
Q3 2020	47,118	$2,979	$54.23	$46.16 - $63.35
Q2 2020	49,493	$2,655	$42.05	$30.99 - $55.36
Q1 2020	50,559	$1,930	$51.06	$26.40 - $65.18
Q4 2019	21,192	$1,487	$60.78	$52.18 - $68.35
Q3 2019	19,992	$1,310	$57.99	$50.43 - $64.27
Q2 2019	29,618	$2,057	$59.69	$51.40 - $69.93
Q1 2019	38,945	$2,643	$64.77	$57.75 - $72.34
Q4 2018	39,255	$2,598	$64.35	$53.36 - $76.44
Q3 2018	18,038	$1,499	$86.83	$72.82 - $100.10
Q2 2018	18,395	$1,980	$99.34	$90.39 - $110.06
Q1 2018	18,131	$2,015	$98.39	$86.89 - $107.41
Q4 2017	18,607	$1,982	$81.78	$72.56 - $95.02
Q3 2017	17,650	$1,467	$64.66	$57.52 - $74.59
Q2 2017	16,836	$1,115	$55.73	$52.23 - $59.49
Q1 2017	10,650	$703	$55.38	$49.25 - $59.68
Q4 2016	11,267	$631	$47.64	$42.61 - $53.78
Q3 2016	14,664	$785	$41.92	$34.93 - $47.03
Q2 2016	5,750	$247	$39.55	$34.26 - $45.64
Q1 2016	6,263	$290	$39.11	$34.33 - $46.52
Q4 2015	23,510	$1,277	$49.75	$44.01 - $54.52
Q3 2015	15,402	$799	$49.96	$42.26 - $59.13
Q2 2015	6,520	$447	$62.10	$58.06 - $67.58
Q1 2015	5,022	$361	$54.56	$46.07 - $62.01
Q3 2014	4,147	$359	$76.69	$70.51 - $83.52
Q2 2014	4,238	$355	$63.36	$52.18 - $72.01