Westlake Corp
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.
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
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Wellington Management Group
Boston,
Massachusetts
|
+$296M |
| 2 |
Capital World Investors
Los Angeles,
California
|
+$155M |
| 3 |
Dimensional Fund Advisors
Austin,
Texas
|
+$41.7M |
| 4 |
Vanguard Group
Malvern,
Pennsylvania
|
+$34M |
| 5 |
OAG
Orbis Allan Gray
Hamilton,
Bermuda
|
+$33.6M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Victory Capital Management
San Antonio,
Texas
|
-$125M |
| 2 |
Citadel Advisors
Miami,
Florida
|
-$71M |
| 3 |
Balyasny Asset Management
Chicago,
Illinois
|
-$36.7M |
| 4 |
Caisse de Depot et Placement du Quebec (CDPQ)
Montreal,
Quebec, Canada
|
-$28.4M |
| 5 |
Arrowstreet Capital
Boston,
Massachusetts
|
-$23.1M |
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.