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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
SEI Investments
126
SEI Investments
Pennsylvania
$1.14M -$665K -7,979 -35%
Creative Planning
127
Creative Planning
Kansas
$1.03M +$180K +2,164 +19%
STA
128
Summit Trail Advisors
New York
$1.01M +$722K +8,662 +192%
Jane Street
129
Jane Street
New York
$1M -$1.78M -21,375 -62%
FC
130
Farringdon Capital
United Kingdom
$965K +$1.04M +12,529 New
JG
131
Jain Global
New York
$957K +$1.03M +12,417 New
LPL Financial
132
LPL Financial
California
$953K -$742K -8,904 -42%
ETC
133
Exchange Traded Concepts
Oklahoma
$943K +$1.02M +12,241 New
LIP
134
Lighthouse Investment Partners
Florida
$899K +$972K +11,661 New
YCM
135
Yousif Capital Management
Michigan
$864K -$54.2K -651 -5%
Ohio Public Employees Retirement System (OPERS)
136
Ohio Public Employees Retirement System (OPERS)
Ohio
$804K +$5.42K +65 +0.6%
SRL
137
Scientech Research LLC
New Jersey
$751K +$812K +9,742 New
BOTPPF
138
Board of the Pension Protection Fund
United Kingdom
$732K +$792K +9,500 New
Universal-Beteiligungs- und Servicegesellschaft
139
Universal-Beteiligungs- und Servicegesellschaft
Germany
$730K +$48.1K +577 +6%
VPIM
140
Vanguard Personalized Indexing Management
California
$720K -$58.4K -701 -7%
LSERS
141
Louisiana State Employees Retirement System
Louisiana
$717K -$8.33K -100 -1%
SWGC
142
Summit Wealth Group (Colorado)
Colorado
$713K +$833K +9,993 New
BCM
143
Bayesian Capital Management
New York
$712K +$770K +9,241 New
Pathstone Holdings
144
Pathstone Holdings
New Jersey
$694K +$167 +2 +0%
Susquehanna International Group
145
Susquehanna International Group
Pennsylvania
$682K -$26.8M -321,970 -97%
COPPSERS
146
Commonwealth of Pennsylvania Public School Employees Retirement System
Pennsylvania
$659K -$750 -9 -0.1%
Handelsbanken Fonder
147
Handelsbanken Fonder
Sweden
$655K – – –
SOMRS
148
State of Michigan Retirement System
Michigan
$609K -$8.33K -100 -1%
QCG
149
Quadrant Capital Group
Ohio
$608K -$4.33K -52 -0.7%
Thrivent Financial for Lutherans
150
Thrivent Financial for Lutherans
Minnesota
$590K -$15.8K -189 -2%
4 5
6
7 8

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.