WESTLAKE CHEM CORP

Ticker: WLK CUSIP: 960413102 Class: Common Stock

MARSHALL WACE, LLP's Holding History (CIK: 0001318757)

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

Q3 2025

Shares 56,461 Value ($000) $4,351 Avg Close $82.33 Range $73.94 - $91.41

Q2 2025

Shares 8,111 Value ($000) $616 Avg Close $80.28 Range $67.52 - $99.92

Q4 2024

Shares 15,914 Value ($000) $1,825 Avg Close $126.38 Range $109.67 - $146.31

Q3 2024

Shares 42,426 Value ($000) $6,376 Avg Close $139.25 Range $125.61 - $148.72

Q3 2022

Shares 253,380 Value ($000) $22,014 Avg Close $90.33 Range $76.70 - $104.08

Q1 2022

Shares 88,325 Value ($000) $10,899 Avg Close $102.15 Range $87.54 - $119.36

Q4 2021

Shares 3,987 Value ($000) $388 Avg Close $91.08 Range $82.73 - $97.95

Q3 2021

Shares 9,979 Value ($000) $910 Avg Close $79.74 Range $72.56 - $88.16

Q2 2021

Shares 15,937 Value ($000) $1,436 Avg Close $90.14 Range $80.84 - $98.96

Q1 2021

Shares 120,960 Value ($000) $10,740 Avg Close $80.32 Range $68.77 - $90.16

Q4 2020

Shares 10,365 Value ($000) $845 Avg Close $68.91 Range $56.02 - $78.45

Q2 2020

Shares 92,404 Value ($000) $4,957 Avg Close $42.05 Range $30.99 - $55.36

Q4 2018

Shares 4,979 Value ($000) $329 Avg Close $64.35 Range $53.36 - $76.44

Q4 2017

Shares 2,553 Value ($000) $272 Avg Close $81.78 Range $72.56 - $95.02

Q4 2016

Shares 184,659 Value ($000) $10,339 Avg Close $47.64 Range $42.61 - $53.78

Q3 2016

Shares 378,317 Value ($000) $20,240 Avg Close $41.92 Range $34.93 - $47.03

Q2 2016

Shares 733,582 Value ($000) $31,485 Avg Close $39.55 Range $34.26 - $45.64

Q1 2016

Shares 350,945 Value ($000) $16,249 Avg Close $39.11 Range $34.33 - $46.52

Q4 2015

Shares 337,217 Value ($000) $18,318 Avg Close $49.75 Range $44.01 - $54.52

Q3 2015

Shares 492,089 Value ($000) $25,534 Avg Close $49.96 Range $42.26 - $59.13

Q2 2015

Shares 442,819 Value ($000) $30,373 Avg Close $62.10 Range $58.06 - $67.58

Q1 2015

Shares 286,208 Value ($000) $20,590 Avg Close $54.56 Range $46.07 - $62.01

Q2 2014

Shares 4,100 Value ($000) $343 Avg Close $63.36 Range $52.18 - $72.01

Q1 2014

Shares 18,483 Value ($000) $1,223 Avg Close $53.68 Range $48.11 - $58.70

Q2 2013

Shares 54,027 Value ($000) $5,209 Avg Close $37.72 Range $32.17 - $41.82

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2025	56,461	$4,351	$82.33	$73.94 - $91.41
Q2 2025	8,111	$616	$80.28	$67.52 - $99.92
Q4 2024	15,914	$1,825	$126.38	$109.67 - $146.31
Q3 2024	42,426	$6,376	$139.25	$125.61 - $148.72
Q3 2022	253,380	$22,014	$90.33	$76.70 - $104.08
Q1 2022	88,325	$10,899	$102.15	$87.54 - $119.36
Q4 2021	3,987	$388	$91.08	$82.73 - $97.95
Q3 2021	9,979	$910	$79.74	$72.56 - $88.16
Q2 2021	15,937	$1,436	$90.14	$80.84 - $98.96
Q1 2021	120,960	$10,740	$80.32	$68.77 - $90.16
Q4 2020	10,365	$845	$68.91	$56.02 - $78.45
Q2 2020	92,404	$4,957	$42.05	$30.99 - $55.36
Q4 2018	4,979	$329	$64.35	$53.36 - $76.44
Q4 2017	2,553	$272	$81.78	$72.56 - $95.02
Q4 2016	184,659	$10,339	$47.64	$42.61 - $53.78
Q3 2016	378,317	$20,240	$41.92	$34.93 - $47.03
Q2 2016	733,582	$31,485	$39.55	$34.26 - $45.64
Q1 2016	350,945	$16,249	$39.11	$34.33 - $46.52
Q4 2015	337,217	$18,318	$49.75	$44.01 - $54.52
Q3 2015	492,089	$25,534	$49.96	$42.26 - $59.13
Q2 2015	442,819	$30,373	$62.10	$58.06 - $67.58
Q1 2015	286,208	$20,590	$54.56	$46.07 - $62.01
Q2 2014	4,100	$343	$63.36	$52.18 - $72.01
Q1 2014	18,483	$1,223	$53.68	$48.11 - $58.70
Q2 2013	54,027	$5,209	$37.72	$32.17 - $41.82