Westlake Corp
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.
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
Top Buyers
| 1 |
OAG
Orbis Allan Gray
Hamilton,
Bermuda
|
+$326M |
| 2 |
Citadel Advisors
Miami,
Florida
|
+$99M |
| 3 |
Holocene Advisors
New York
|
+$58M |
| 4 |
TSW
Thompson Siegel & Walmsley
Richmond,
Virginia
|
+$36.8M |
| 5 |
Balyasny Asset Management
Chicago,
Illinois
|
+$33M |
Top Sellers
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.