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Westlake Corp
WLK

304 hedge funds and large institutions have $3.2B invested in Westlake Corp in 2025 Q3 according to their latest regulatory filings, with 58 funds opening new positions, 102 increasing their positions, 106 reducing their positions, and 55 closing their positions.

New
Increased
Maintained
Reduced
Closed

50% more funds holding in top 10

Funds holding in top 10: 2 → 3 (+1)

7% more capital invested

Capital invested by funds: $2.99B → $3.2B (+$210M)

1.7% more ownership

Funds ownership: 30.71% → 32.41% (+1.7%)

5% more first-time investments, than exits

New positions opened: 58 | Existing positions closed: 55

0% less funds holding

Funds holding: 305 → 304 (-1)

4% less repeat investments, than reductions

Existing positions increased: 102 | Existing positions reduced: 106

67% less call options, than puts

Call options by funds: $19.3M | Put options by funds: $57.8M

Holders
304
Holders Change
-1
Holders Change %
-0.33%
% of All Funds
3.99%
Holding in Top 10
3
Holding in Top 10 Change
+1
Holding in Top 10 Change %
+50%
% of All Funds
0.04%
New
58
Increased
102
Reduced
106
Closed
55
Calls
$19.3M
Puts
$57.8M
Net Calls
-$38.4M
Net Calls Change
+$201K

Top Buyers

1
OAG
Orbis Allan Gray
Bermuda
+$326M
2
Citadel Advisors
Citadel Advisors
Florida
+$99M
3
Holocene Advisors
Holocene Advisors
New York
+$58M
4
TSW
Thompson Siegel & Walmsley
Virginia
+$36.8M
5
Balyasny Asset Management
Balyasny Asset Management
Illinois
+$33M

Top Sellers

1
Fidelity Investments
Fidelity Investments
Massachusetts
-$108M
2
Victory Capital Management
Victory Capital Management
Texas
-$71.3M
3
Millennium Management
Millennium Management
New York
-$57M
4
Susquehanna International Group
Susquehanna International Group
Pennsylvania
-$26.8M
5
EGM
Engineers Gate Manager
New York
-$26.7M
Name Holding Trade Value Shares
Change 		Change in
Stake
KBC Group
101
KBC Group
Belgium
$2.12M -$1.7M -20,458 -43%
Envestnet Asset Management
102
Envestnet Asset Management
Illinois
$2.12M +$587K +7,050 +35%
OQS
103
Occudo Quantitative Strategies
Florida
$2.11M +$1.02M +12,287 +81%
Verition Fund Management
104
Verition Fund Management
Connecticut
$2.09M -$1.23M -14,768 -35%
Renaissance Technologies
105
Renaissance Technologies
New York
$2M -$9.86M -118,300 -82%
Mackenzie Financial
106
Mackenzie Financial
Ontario, Canada
$1.95M +$2.11M +25,320 New
PHK
107
Point72 Hong Kong
Hong Kong
$1.92M +$2.07M +24,871 New
State Board of Administration of Florida Retirement System
108
State Board of Administration of Florida Retirement System
Florida
$1.86M -$44.6K -535 -2%
SDIC
109
South Dakota Investment Council
South Dakota
$1.73M +$25K +300 +1%
KOCAA
110
Knights of Columbus Asset Advisors
Connecticut
$1.72M – – –
GAM
111
Gotham Asset Management
New York
$1.7M +$832K +9,989 +83%
PP
112
PDT Partners
New York
$1.5M +$1.63M +19,520 New
DIA
113
Dana Investment Advisors
Wisconsin
$1.48M -$48.8K -586 -3%
AIP
114
Ameritas Investment Partners
Nebraska
$1.44M +$589K +7,066 +61%
American Century Companies
115
American Century Companies
Missouri
$1.4M +$4.58K +55 +0.3%
RIA
116
Recurrent Investment Advisors
Texas
$1.4M +$167 +2 +0%
APG Asset Management
117
APG Asset Management
Netherlands
$1.38M – – –
MIM
118
MetLife Investment Management
New Jersey
$1.32M -$68K -816 -5%
Stifel Financial
119
Stifel Financial
Missouri
$1.29M +$367K +4,406 +36%
PCM
120
Polymer Capital Management
New York
$1.25M +$178K +2,140 +15%
Twin Tree Management
121
Twin Tree Management
Texas
$1.24M -$1.11M -13,323 -45%
MOACM
122
Mutual of America Capital Management
New York
$1.19M -$98.4K -1,181 -7%
AB
123
Amalgamated Bank
New York
$1.18M +$5.33K +64 +0.4%
Canada Life
124
Canada Life
Manitoba, Canada
$1.17M – – –
Treasurer of the State of North Carolina
125
Treasurer of the State of North Carolina
North Carolina
$1.16M -$48.8K -586 -4%
3 4
5
6 7

WLK Hedge Fund Activity: Q3 2025 in Review

304 of the 7,619 institutional investors tracked by Wall St. Rank reported a position in Westlake Corp (WLK) for Q3 2025, worth a combined $3.2B — up 7% from $2.99B a quarter earlier.

Buyers outnumbered sellers: 58 funds opened new WLK positions and 55 closed out — a net gain of 3 holders — while 102 added to existing stakes and 106 trimmed.

The largest buyer was Orbis Allan Gray, opening a new position worth an estimated $326M. The largest seller was Fidelity Investments, cutting an estimated $108M.

  • 304 institutional investors held Westlake Corp (WLK) as of Q3 2025, down from 305 in Q2 2025.
  • Funds reported $3.2B of Westlake Corp stock for Q3 2025, up 7% quarter-over-quarter.
  • 58 funds opened new Westlake Corp positions in Q3 2025 and 55 closed out, a net change of +3 holders.
  • The largest Westlake Corp buyer in Q3 2025 was Orbis Allan Gray, an estimated $326M added.
  • The largest Westlake Corp seller in Q3 2025 was Fidelity Investments, an estimated $108M sold.

Based on aggregated 13F filings for Q3 2025.