WLK
Westlake Corporation · Basic Materials · Chemicals - Specialty
Momentum inputs (comparable managers): holder breadth 0.0% · share flow +5.5% · net new positions 0.0% — formula
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 108 | +6 | 28.25M | $2.07B | +17 | −13 |
| Q1 2026 | 107 | +10 | 30.63M | $3.57B | +16 | −7 |
| Q4 2025 | 97 | -3 | 33.32M | $2.46B | +2 | −4 |
| Q3 2025 | 21 | +2 | 15.45M | $1.19B | +2 | −1 |
| Q2 2025 | 17 | 0 | 15.73M | $1.19B | +3 | −3 |
| Q1 2025 | 14 | -1 | 6.45M | $645.11M | — | −1 |
| Q4 2024 | 15 | 0 | 5.16M | $591.46M | +1 | −1 |
| Q3 2024 | 14 | +1 | 3.58M | $537.73M | +2 | −1 |
| Q2 2024 | 13 | — | 3.36M | $486.12M | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | The Vanguard Group ✦ (passive) | 3.52M | — | $267.49M | 0.0% | n/c | 1 | SEC ↗ ×5 |
| 2 | BlackRock ✦ (passive) | 3.33M | — | $252.75M | 0.0% | n/c | 1 | SEC ↗ ×14 |
| 3 | T. Rowe Price ✦ | 2.06M | +9618.1% | $156.31M | 0.0% | ▲ Add | 5 | SEC ↗ ×2 |
| 4 | Fidelity (FMR) ✦ | 1.62M | — | $122.65M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 5 | State Street Global Advisors ✦ (passive) | 1.39M | -14.6% | $105.71M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 6 | Norges Bank ✦ (passive) | 1.37M | +272.4% | $104.31M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 7 | Millennium Management ✦ | 789.85K | -12.4% | $59.97M | 0.1% | ▼ Trim | 5 | SEC ↗ |
| 8 | Geode Capital Management ✦ (passive) | 574.23K | -0.4% | $43.61M | 0.0% | ▼ Trim | 5 | SEC ↗ ×2 |
| 9 | D. E. Shaw & Co. ✦ | 342.96K | +50.2% | $26.04M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 10 | Arrowstreet Capital ✦ | 290.04K | New | $22.02M | 0.0% | New | 1 | SEC ↗ |
| 11 | Renaissance Technologies ✦ | 144.20K | -48.5% | $10.95M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 12 | AQR Capital Management ✦ | 133.35K | +598.4% | $10.03M | 0.0% | ▲ Add | 5 | SEC ↗ ×5 |
| 13 | Two Sigma Investments ✦ | 122.11K | -54.1% | $9.27M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 14 | Citadel Advisors ✦ | 12.31K | -98.6% | $934,395 | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 15 | Gotham Asset Management ✦ | 12.08K | +122.3% | $916,931 | 0.0% | ▲ Add | 5 | SEC ↗ |
| 16 | GAMCO Investors ✦ | 11.57K | New | $878,206 | 0.0% | New | 1 | SEC ↗ |
| 17 | Marshall Wace ✦ | 8.11K | New | $615,868 | 0.0% | New | 1 | SEC ↗ ×2 |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Arrowstreet Capital | $22.02M | 0.0% |
| GAMCO Investors | $878,206 | 0.0% |
| Marshall Wace | $615,868 | 0.0% |
Exited
| Capital World Investors | $129.05M | was 0.0% |
| Adage Capital Partners | $598,980 | was 0.0% |
| Wellington Management | $467,540 | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 332 holders, 44.00M shares, $4.81B reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.
Open-market purchases (P)
No open-market insider purchases in our coverage window.
Open-market sales (S)
Officer, Director · 7.49K sh · $596,873
Officer, Director · 31.38K sh · $2.52M
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology