Security record · archived quarter
WLK
Westlake Corporation · Basic Materials · Chemicals - Specialty
97Tracked holders
-3Δ holders
33.32MShares held
$2.46BReported value
+2New positions
−4Exits
Momentum inputs (comparable managers):
holder breadth -3.0% ·
share flow +19.7% ·
net new positions -2.1%
— formula
Concentrated accumulation — rising shares among fewer holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q4 2025
Ownership over time
| 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 | — | — |
Who holds it · Q4 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Wellington Management ✦ | 4.22M | +7239.1% | $312.08M | 0.1% | ▲ Add | 2 | SEC ↗ ×5 |
| 2 | The Vanguard Group ✦ (passive) | 3.92M | +13.9% | $289.65M | 0.0% | ▲ Add | 3 | SEC ↗ ×5 |
| 3 | BlackRock ✦ (passive) | 3.26M | +2.4% | $241.15M | 0.0% | ▲ Add | 3 | SEC ↗ ×15 |
| 4 | T. Rowe Price ✦ | 2.21M | 0.0% | $163.31M | 0.0% | ▲ Add | 7 | SEC ↗ ×2 |
| 5 | Capital World Investors ✦ | 2.17M | New | $160.55M | 0.0% | New | 1 | SEC ↗ |
| 6 | Dimensional Fund Advisors Lp | 1.89M | — | $139.43M | 0.0% | n/c | 1 | SEC ↗ ×5 |
| 7 | State Street Global Advisors ✦ (passive) | 1.40M | +7.8% | $103.27M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 8 | Holocene Advisors, LP | 1.22M | — | $90.25M | 0.2% | n/c | 1 | SEC ↗ |
| 9 | Victory Capital Management Inc | 1.11M | — | $82.36M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 10 | UBS AM, a distinct business unit of… | 924.70K | — | $68.37M | 0.0% | n/c | 1 | SEC ↗ ×8 |
| 11 | MIRAE ASSET GLOBAL ETFS HOLDINGS… | 876.88K | — | $64.84M | 0.1% | n/c | 1 | SEC ↗ ×2 |
| 12 | Morgan Stanley ✦ | 759.62K | -6.9% | $56.17M | 0.0% | ▼ Trim | 2 | SEC ↗ ×10 |
| 13 | Goldman Sachs Group ✦ | 753.95K | -28.3% | $55.75M | 0.0% | ▼ Trim | 2 | SEC ↗ ×3 |
| 14 | Nuveen, LLC | 652.91K | — | $48.28M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 15 | UBS Group AG | 648.01K | — | $47.91M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 16 | Geode Capital Management ✦ (passive) | 594.92K | -8.9% | $44.00M | 0.0% | ▼ Trim | 7 | SEC ↗ ×2 |
| 17 | Allspring Global Investments… | 506.76K | — | $37.58M | 0.1% | n/c | 1 | SEC ↗ ×2 |
| 18 | D. E. Shaw & Co. ✦ | 486.28K | +203.9% | $35.96M | 0.0% | ▲ Add | 6 | SEC ↗ ×2 |
| 19 | ProShare Advisors LLC | 435.26K | — | $32.18M | 0.1% | n/c | 1 | SEC ↗ |
| 20 | Millennium Management ✦ | 427.75K | +302.3% | $31.63M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 21 | Janus Henderson Group Plc | 334.59K | — | $24.74M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 22 | New York State Common Retirement… | 309.63K | — | $22.89M | 0.0% | n/c | 1 | SEC ↗ |
| 23 | Charles Schwab Investment… | 297.25K | — | $21.98M | 0.0% | n/c | 1 | SEC ↗ |
| 24 | Northern Trust Corp | 268.63K | — | $19.86M | 0.0% | n/c | 1 | SEC ↗ ×5 |
| 25 | Fidelity (FMR) ✦ | 228.84K | -27.2% | $16.92M | 0.0% | ▼ Trim | 3 | SEC ↗ ×4 |
| 26 | Invesco Ltd. | 213.16K | — | $15.76M | 0.0% | n/c | 1 | SEC ↗ ×7 |
| 27 | Citadel Advisors ✦ | 203.30K | -83.1% | $15.03M | 0.0% | ▼ Trim | 7 | SEC ↗ ×2 |
| 28 | Two Sigma Investments ✦ | 198.38K | +92.7% | $14.67M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 29 | Bank Of America Corp /De/ | 184.44K | — | $13.64M | 0.0% | n/c | 1 | SEC ↗ ×8 |
| 30 | Norges Bank ✦ (passive) | 181.33K | New | $13.41M | 0.0% | New | 1 | SEC ↗ |
| 31 | Bank of New York Mellon Corp | 174.32K | — | $12.89M | 0.0% | n/c | 1 | SEC ↗ ×12 |
| 32 | Russell Investments Group, Ltd. | 158.32K | — | $11.71M | 0.0% | n/c | 1 | SEC ↗ ×13 |
| 33 | First Trust Advisors Lp | 146.41K | — | $10.83M | 0.0% | n/c | 1 | SEC ↗ |
| 34 | Cerity Partners LLC | 127.09K | — | $9.40M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 35 | Quantinno Capital Management LP | 116.37K | — | $8.60M | 0.0% | n/c | 1 | SEC ↗ |
| 36 | Federated Hermes, Inc. | 107.73K | — | $7.97M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 37 | Alyeska Investment Group, L.P. | 103.04K | — | $7.62M | 0.0% | n/c | 1 | SEC ↗ |
| 38 | Corient Private Wealth LP | 101.43K | — | $7.50M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 39 | Bnp Paribas Financial Markets | 92.22K | — | $6.82M | 0.0% | n/c | 1 | SEC ↗ |
| 40 | Wells Fargo & Company/Mn | 91.88K | — | $6.79M | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 41 | Rhumbline Advisers | 85.43K | — | $6.32M | 0.0% | n/c | 1 | SEC ↗ |
| 42 | Royal Bank Of Canada | 85.27K | — | $6.30M | 0.0% | n/c | 1 | SEC ↗ ×8 |
| 43 | Swiss National Bank | 75.90K | — | $5.61M | 0.0% | n/c | 1 | SEC ↗ |
| 44 | Lazard Asset Management Llc | 74.43K | — | $5.50M | 0.0% | n/c | 1 | SEC ↗ |
| 45 | Principal Financial Group Inc | 71.72K | — | $5.30M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 46 | Alliancebernstein L.P. | 68.45K | — | $5.06M | 0.0% | n/c | 1 | SEC ↗ |
| 47 | JPMorgan Chase ✦ | 67.32K | -78.7% | $4.98M | 0.0% | ▼ Trim | 2 | SEC ↗ ×9 |
| 48 | Barclays Plc | 66.61K | — | $4.93M | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 49 | Legal & General Group Plc | 57.25K | — | $4.23M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 50 | Ameriprise Financial Inc | 49.12K | — | $3.63M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 51 | California Public Employees… | 46.76K | — | $3.46M | 0.0% | n/c | 1 | SEC ↗ |
| 52 | California State Teachers… | 36.10K | — | $2.67M | 0.0% | n/c | 1 | SEC ↗ |
| 53 | Manufacturers Life Insurance… | 33.45K | — | $2.47M | 0.0% | n/c | 1 | SEC ↗ |
| 54 | Sei Investments Co | 28.44K | — | $2.10M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 55 | Envestnet Asset Management Inc | 27.87K | — | $2.06M | 0.0% | n/c | 1 | SEC ↗ |
| 56 | Citigroup Inc | 27.34K | — | $2.02M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 57 | Bank Of Montreal /Can/ | 26.92K | — | $1.99M | 0.0% | n/c | 1 | SEC ↗ ×5 |
| 58 | State Of Wisconsin Investment Board | 25.71K | — | $1.90M | 0.0% | n/c | 1 | SEC ↗ |
| 59 | State Board Of Administration Of… | 24.11K | — | $1.78M | 0.0% | n/c | 1 | SEC ↗ |
| 60 | Susquehanna International Group, Llp | 23.80K | — | $1.76M | 0.0% | n/c | 1 | SEC ↗ |
| 61 | AQR Capital Management ✦ | 20.54K | -60.9% | $1.52M | 0.0% | ▼ Trim | 7 | SEC ↗ ×4 |
| 62 | Mackenzie Financial Corp | 19.83K | — | $1.48M | 0.0% | n/c | 1 | SEC ↗ |
| 63 | Stifel Financial Corp | 18.92K | — | $1.40M | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 64 | American Century Companies Inc | 18.30K | — | $1.35M | 0.0% | n/c | 1 | SEC ↗ |
| 65 | Storebrand Asset Management As | 15.40K | — | $1.14M | 0.0% | n/c | 1 | SEC ↗ |
| 66 | Zurcher Kantonalbank (Zurich… | 13.37K | — | $988,356 | 0.0% | n/c | 1 | SEC ↗ |
| 67 | LPL Financial LLC | 12.65K | — | $935,173 | 0.0% | n/c | 1 | SEC ↗ |
| 68 | Mitsubishi UFJ Asset Management… | 9.98K | — | $740,017 | 0.0% | n/c | 1 | SEC ↗ |
| 69 | Gotham Asset Management ✦ | 9.20K | -58.3% | $680,174 | 0.0% | ▼ Trim | 7 | SEC ↗ |
| 70 | Universal- Beteiligungs- und… | 9.18K | — | $678,917 | 0.0% | n/c | 1 | SEC ↗ |
| 71 | Canada Pension Plan Investment Board | 7.93K | — | $586,418 | 0.0% | n/c | 1 | SEC ↗ |
| 72 | Creative Planning | 7.68K | — | $568,229 | 0.0% | n/c | 1 | SEC ↗ |
| 73 | Pictet Asset Management Holding SA | 6.03K | — | $445,489 | 0.0% | n/c | 1 | SEC ↗ |
| 74 | Daiwa Securities Group Inc. | 4.11K | — | $304,000 | 0.0% | n/c | 1 | SEC ↗ |
| 75 | Pacer Advisors, Inc. | 3.99K | — | $294,873 | 0.0% | n/c | 1 | SEC ↗ |
| 76 | CIBC Asset Management Inc | 3.98K | — | $294,059 | 0.0% | n/c | 1 | SEC ↗ |
| 77 | GAMCO Investors ✦ | 3.94K | -4.8% | $291,398 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 78 | Mercer Global Advisors Inc /Adv | 3.92K | — | $290,068 | 0.0% | n/c | 1 | SEC ↗ |
| 79 | Assenagon Asset Management S.A. | 3.79K | — | $280,233 | 0.0% | n/c | 1 | SEC ↗ |
| 80 | Cetera Investment Advisers | 3.15K | — | $233,225 | 0.0% | n/c | 1 | SEC ↗ |
| 81 | Raymond James Financial Inc | 3.12K | — | $230,769 | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 82 | Capstone Investment Advisors, Llc | 3.12K | — | $230,619 | 0.0% | n/c | 1 | SEC ↗ |
| 83 | Us Bancorp \De\ | 2.01K | — | $148,619 | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 84 | Simplex Trading, Llc | 1.98K | — | $146,475 | 0.0% | n/c | 1 | SEC ↗ |
| 85 | Pnc Financial Services Group, Inc. | 1.33K | — | $98,711 | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 86 | Deutsche Bank Ag\ | 1.08K | — | $80,151 | 0.0% | n/c | 1 | SEC ↗ |
| 87 | Rockefeller Capital Management L.P. | 955 | — | $70,634 | 0.0% | n/c | 1 | SEC ↗ |
| 88 | Nomura Asset Management Co Ltd | 896 | — | $66,250 | 0.0% | n/c | 1 | SEC ↗ |
| 89 | Fifth Third Bancorp | 562 | — | $41,554 | 0.0% | n/c | 1 | SEC ↗ |
| 90 | Cwm, Llc | 346 | — | $26,000 | 0.0% | n/c | 1 | SEC ↗ |
| 91 | BNP Paribas Asset Management… | 338 | — | $25,000 | 0.0% | n/c | 1 | SEC ↗ |
| 92 | Jones Financial Companies Lllp | 306 | — | $22,648 | 0.0% | n/c | 1 | SEC ↗ |
| 93 | Osaic Holdings, Inc. | 280 | — | $20,701 | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 94 | National Bank Of Canada /Fi/ | 275 | — | $20,331 | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 95 | First Eagle Investment Management… | 53 | — | $3,919 | 0.0% | n/c | 1 | SEC ↗ |
| 96 | TD Waterhouse Canada Inc. | 40 | — | $2,958 | 0.0% | n/c | 1 | SEC ↗ |
| 97 | Assetmark, Inc | 39 | — | $2,884 | 0.0% | n/c | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Capital World Investors | $160.55M | 0.0% |
| Norges Bank | $13.41M | 0.0% |
Exited
| Arrowstreet Capital | $23.10M | was 0.0% |
| Point72 Asset Management | $6.54M | was 0.0% |
| Marshall Wace | $4.35M | was 0.0% |
| Renaissance Technologies | $2.00M | 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.
Frequently co-owned
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)
Aug 11
Chao Albert
Officer, Director · 7.49K sh · $596,873
Aug 11
Chao Albert
Officer, Director · 31.38K sh · $2.52M
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology
Provenance: Ownership from parsed 13F common-stock positions (tracked universe, comparable sets for changes); insider rows from Forms 3/4/5; stakes from Schedules 13D/13G; every filing links to its original on SEC EDGAR.
Reporting period: Q4 2025 ·
Methodology ·
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