Ticker · CUSIP 960413102

WLK

WESTLAKE CORPORATION

Basic Materials·Specialty Chemicals

···Share

Holders (tracked)

Combined shares

8,127,306

Combined value

$437.78M

Last close

—

Quarter

2025Q4

Tracked holders · last 8 quarters

+3 vs previous quarter over the last 8.

SEC event timeline

25 events

Ken Griffin (Citadel Advisors) trimmed2026-02-17
−997,548 shares · 2025Q4
Position
D.E. Shaw & Co. added2026-02-17
+326,272 shares · 2025Q4
Position
Two Sigma Investments added2026-02-17
+95,414 shares · 2025Q4
Position
Izzy Englander (Millennium Mgmt) added2026-02-17
+321,434 shares · 2025Q4
Position
Steve Cohen (Point72) exited2026-02-17
−84,884 shares · 2025Q4
Position
T. Rowe Price added2026-02-17
+572 shares · 2025Q4
Position
Wellington Management added2026-02-17
+4,163,207 shares · 2025Q4
Position
Paul Tudor Jones (Tudor Investment) opened position2026-02-17
+3,300 shares · 2025Q4
Position
AQR Capital Management trimmed2026-02-17
−31,987 shares · 2025Q4
Position
Renaissance Technologies exited2026-02-12
−25,900 shares · 2025Q4
Position
Norges Bank (Norway SWF) opened position2026-02-10
+181,328 shares · 2025Q4
Position
Mario Gabelli (GAMCO) trimmed2026-02-05
−200 shares · 2025Q4
Position
First Eagle Investment Management opened position2026-02-04
+53 shares · 2025Q4
Position
Two Sigma Investments trimmed2025-11-14
−19,150 shares · 2025Q3
Position
D.E. Shaw & Co. trimmed2025-11-14
−182,951 shares · 2025Q3
Position
AQR Capital Management trimmed2025-11-14
−80,833 shares · 2025Q3
Position
Izzy Englander (Millennium Mgmt) trimmed2025-11-14
−683,526 shares · 2025Q3
Position
Steve Cohen (Point72) opened position2025-11-14
+84,884 shares · 2025Q3
Position
T. Rowe Price added2025-11-14
+149,555 shares · 2025Q3
Position
Wellington Management opened position2025-11-14
+57,510 shares · 2025Q3
Position
Renaissance Technologies trimmed2025-11-13
−118,300 shares · 2025Q3
Position
Norges Bank (Norway SWF) exited2025-11-13
−1,373,816 shares · 2025Q3
Position
Norges Bank (Norway SWF) added2025-11-12
+6,931 shares · 2024Q3
Position
First Eagle Investment Management exited2025-11-12
−6,885 shares · 2025Q3
Position
Mario Gabelli (GAMCO) trimmed2025-11-12
−7,425 shares · 2025Q3
Position

Insider activity

No insider transactions in the last 30 days.

View full insider history for WLK →

Who moved on this name in 2025Q4

Position changes reported for the latest quarter, grouped by direction.

New positions3

Norges Bank (Norway SWF)
+181,328
$13.4M
Paul Tudor Jones (Tudor Investment)
+3,300
$244K
First Eagle Investment Management
+53
$4K

Added to5

Wellington Management
+4,163,207
$307.8M
D.E. Shaw & Co.
+326,272
$24.1M
Izzy Englander (Millennium Mgmt)
+321,434
$23.8M
Two Sigma Investments
+95,414
$7.1M
T. Rowe Price
+572
$42

Trimmed3

Ken Griffin (Citadel Advisors)
−997,548
$73.8M
AQR Capital Management
−31,987
$2.4M
Mario Gabelli (GAMCO)
−200
$15K

Exited2

Steve Cohen (Point72)
−84,884
$6.5M
Renaissance Technologies
−25,900
$2.0M

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.

Quarter	Holders	Shares	Combined value	Δ holders
2022Q1	13	4,317,239	$42.19B	—
2022Q2	16	3,725,527	$52.15B	+3
2022Q3	17	3,938,574	$27.8M	+1
2022Q4	15	5,491,236	$559.2M	-2
2023Q1	14	6,012,346	$688.6M	-1
2023Q2	14	5,828,589	$689.8M	—
2023Q3	14	5,765,121	$705.7M	—
2023Q4	13	5,175,893	$708.9M	-1
2024Q1	13	4,948,851	$753.5M	—
2024Q2	15	4,968,590	$716.7M	+2
2024Q3	14	1,824,300	$271.2M	-1
2024Q4	11	2,120,935	$240.6M	-3
2025Q1	11	2,636,952	$261.6M	—
2025Q2	15	5,088,337	$230.1M	+4
2025Q3	12	4,076,345	$144.1M	-3
2025Q4	15	8,127,306	$437.8M	+3

Who owns WLK

15 super-investors · 2025Q4

Tracked stake

8.13M

Combined value

$438M

% of shares outstanding

—

shares-out unknown

Quarter action mix

New3Added7Trim5

#	Manager	Shares	Value	% of book	Last action
1	Wellington Management	4.22M	$312M	0.1%	Added+4.16M
2	D.E. Shaw & Co.	486.3K	$36M	0.0%	Added+326.3K
3	Izzy Englander Millennium Mgmt	427.8K	$32M	0.0%	Added+321.4K
4	Ken Griffin Citadel Advisors	203.3K	$15M	0.0%	Trim−997.5K
5	Two Sigma Investments	198.4K	$15M	0.0%	Added+95.4K
6	Norges Bank Norway SWF	181.3K	$13M	0.0%	New+181.3K
7	Ken Griffin Citadel Advisors	104.9K	$8M	0.0%	Trim−997.5K
8	Ken Griffin Citadel Advisors	58.6K	$4M	0.0%	Trim−997.5K
9	AQR Capital Management	20.5K	$2M	0.0%	Trim−32.0K
10	D.E. Shaw & Co.	6.6K	$488K	0.0%	Added+326.3K
11	Mario Gabelli GAMCO	3.9K	$291K	0.0%	Trim−200
12	Paul Tudor Jones Tudor Investment	3.3K	$244K	0.0%	New+3.3K
13	Two Sigma Investments	2.9K	$214K	0.0%	Added+95.4K
14	T. Rowe Price	2.21M	$163K	0.0%	Added+572
15	First Eagle Investment Management	53	$4K	0.0%	New+53

Recent moves

20 transactions

SOLDSteve Cohen (Point72)
−84,884 · 2025Q4
NEWPaul Tudor Jones (Tudor Investment)
+3,300 · 2025Q4
ADDT. Rowe Price
+572 · 2025Q4
ADDTwo Sigma Investments
+95,414 · 2025Q4
TRIMAQR Capital Management
−31,987 · 2025Q4
TRIMKen Griffin (Citadel Advisors)
−997,548 · 2025Q4
ADDWellington Management
+4,163,207 · 2025Q4
ADDIzzy Englander (Millennium Mgmt)
+321,434 · 2025Q4
ADDD.E. Shaw & Co.
+326,272 · 2025Q4
SOLDRenaissance Technologies
−25,900 · 2025Q4
NEWNorges Bank (Norway SWF)
+181,328 · 2025Q4
TRIMMario Gabelli (GAMCO)
−200 · 2025Q4
NEWFirst Eagle Investment Management
+53 · 2025Q4
NEWSteve Cohen (Point72)
+84,884 · 2025Q3
TRIMIzzy Englander (Millennium Mgmt)
−683,526 · 2025Q3
TRIMTwo Sigma Investments
−19,150 · 2025Q3
TRIMD.E. Shaw & Co.
−182,951 · 2025Q3
ADDT. Rowe Price
+149,555 · 2025Q3
NEWWellington Management
+57,510 · 2025Q3
TRIMAQR Capital Management
−80,833 · 2025Q3

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