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Westlake Corp
WLK

296 hedge funds and large institutions have $3.44B invested in Westlake Corp in 2025 Q4 according to their latest regulatory filings, with 62 funds opening new positions, 93 increasing their positions, 112 reducing their positions, and 64 closing their positions.

New
Increased
Maintained
Reduced
Closed

7% more capital invested

Capital invested by funds: $3.2B → $3.44B (+$233M)

3.8% more ownership

Funds ownership: 32.41% → 36.21% (+3.8%)

0% more funds holding in top 10

Funds holding in top 10: 3 → 3 (0)

3% less first-time investments, than exits

New positions opened: 62 | Existing positions closed: 64

3% less funds holding

Funds holding: 304 → 296 (-8)

17% less repeat investments, than reductions

Existing positions increased: 93 | Existing positions reduced: 112

64% less call options, than puts

Call options by funds: $18.4M | Put options by funds: $51.2M

Holders
296
Holders Change
-8
Holders Change %
-2.63%
% of All Funds
3.6%
Holding in Top 10
3
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.04%
New
62
Increased
93
Reduced
112
Closed
64
Calls
$18.4M
Puts
$51.2M
Net Calls
-$32.8M
Net Calls Change
+$5.63M

Top Buyers

Rank Fund Capital Flow
1
Wellington Management Group
Wellington Management Group
Massachusetts
+$296M
2
Capital World Investors
Capital World Investors
California
+$155M
3
Dimensional Fund Advisors
Dimensional Fund Advisors
Texas
+$41.7M
4
Vanguard Group
Vanguard Group
Pennsylvania
+$34M
5
OAG
Orbis Allan Gray
Bermuda
+$33.6M

Top Sellers

Rank Fund Capital Flow
1
Victory Capital Management
Victory Capital Management
Texas
-$125M
2
Citadel Advisors
Citadel Advisors
Florida
-$71M
3
Balyasny Asset Management
Balyasny Asset Management
Illinois
-$36.7M
4
Caisse de Depot et Placement du Quebec (CDPQ)
Caisse de Depot et Placement du Quebec (CDPQ)
Quebec, Canada
-$28.4M
5
Arrowstreet Capital
Arrowstreet Capital
Massachusetts
-$23.1M
Name Holding Trade Value Shares
Change 		Change in
Stake
ASRS
126
Arizona State Retirement System
Arizona
$798K +$768K +10,794 New
Ohio Public Employees Retirement System (OPERS)
127
Ohio Public Employees Retirement System (OPERS)
Ohio
$744K -$27.2K -382 -4%
Mitsubishi UFJ Asset Management
128
Mitsubishi UFJ Asset Management
Japan
$740K +$258K +3,628 +57%
WAM
129
Weiss Asset Management
Massachusetts
$734K +$707K +9,928 New
VPIM
130
Vanguard Personalized Indexing Management
California
$721K +$29.3K +411 +4%
BHCM
131
Brevan Howard Capital Management
Jersey
$700K +$147K +2,062 +28%
LSERS
132
Louisiana State Employees Retirement System
Louisiana
$680K -$7.12K -100 -1%
GAM
133
Gotham Asset Management
New York
$680K -$916K -12,866 -58%
Universal-Beteiligungs- und Servicegesellschaft
134
Universal-Beteiligungs- und Servicegesellschaft
Germany
$679K -$20.7K -291 -3%
AWCI
135
Alpine Woods Capital Investors
New York
$665K +$640K +8,989 New
Handelsbanken Fonder
136
Handelsbanken Fonder
Sweden
$658K +$28.5K +400 +5%
COPPSERS
137
Commonwealth of Pennsylvania Public School Employees Retirement System
Pennsylvania
$617K -$15.1K -212 -2%
KK
138
KLP Kapitalforvaltning
Norway
$606K +$584K +8,200 New
Canada Pension Plan Investment Board
139
Canada Pension Plan Investment Board
Ontario, Canada
$586K +$194K +2,721 +52%
SOMRS
140
State of Michigan Retirement System
Michigan
$584K – – –
DekaBank Deutsche Girozentrale
141
DekaBank Deutsche Girozentrale
Germany
$583K – – –
SOW
142
State of Wyoming
Wyoming
$579K +$557K +7,824 New
Creative Planning
143
Creative Planning
Kansas
$568K -$402K -5,644 -42%
Thrivent Financial for Lutherans
144
Thrivent Financial for Lutherans
Minnesota
$555K -$10.7K -151 -2%
NMIMC
145
Northwestern Mutual Investment Management Company
Wisconsin
$552K +$2.13K +30 +0.4%
OTL
146
Oak Thistle LLC
New York
$530K +$510K +7,170 New
EP
147
Edgestream Partners
New Jersey
$525K +$505K +7,095 New
BAMF
148
BI Asset Management Fondsmaeglerselskab
Denmark
$520K +$238K +3,338 +90%
NMERB
149
New Mexico Educational Retirement Board
New Mexico
$518K – – –
PI
150
Pettee Investors
Connecticut
$496K – – –
4 5
6
7 8

WLK Hedge Fund Activity: Q4 2025 in Review

296 of the 8,223 institutional investors tracked by Wall St. Rank reported a position in Westlake Corp (WLK) for Q4 2025, worth a combined $3.44B — up 7.3% from $3.2B a quarter earlier.

Sellers outnumbered buyers: 64 funds closed out of WLK and 62 opened new positions — a net loss of 2 holders — while 112 trimmed existing stakes and 93 added.

The largest buyer was Wellington Management Group, adding an estimated $296M. The largest seller was Victory Capital Management, cutting an estimated $125M.

  • 296 institutional investors held Westlake Corp (WLK) as of Q4 2025, down from 304 in Q3 2025.
  • Funds reported $3.44B of Westlake Corp stock for Q4 2025, up 7.3% quarter-over-quarter.
  • 62 funds opened new Westlake Corp positions in Q4 2025 and 64 closed out, a net change of -2 holders.
  • The largest Westlake Corp buyer in Q4 2025 was Wellington Management Group, an estimated $296M added.
  • The largest Westlake Corp seller in Q4 2025 was Victory Capital Management, an estimated $125M sold.

Based on aggregated 13F filings for Q4 2025.