Security record · archived quarter
WLK
Westlake Corporation · Basic Materials · Chemicals - Specialty
107Tracked holders
+10Δ holders
30.63MShares held
$3.57BReported value
+16New positions
−7Exits
Momentum inputs (comparable managers):
holder breadth +10.3% ·
share flow -1.4% ·
net new positions +8.4%
· formula
Ownership fragmentation: more holders, smaller aggregate stake
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q1 2026
Ownership over time
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q3 2026 | 2 | -1 | 21.69K | $1.35M | n/a | −2 |
| 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 | n/a | −1 |
| Q4 2024 | 15 | 0 | 5.16M | $591.46M | +1 | −1 |
| Q3 2024 | 14 | +1 | 3.58M | $537.73M | +2 | −1 |
| Q2 2024 | 13 | n/a | 3.36M | $486.12M | n/a | n/a |
Who holds it · Q1 2026
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Capital World Investors ✦ | 4.21M | +93.9% | $491.93M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 2 | BlackRock ✦ (passive) | 3.08M | -5.6% | $359.70M | 0.0% | ▼ Trim | 4 | SEC ↗ ×15 |
| 3 | T. Rowe Price ✦ | 2.41M | +9.0% | $281.24M | 0.0% | ▲ Add | 8 | SEC ↗ ×2 |
| 4 | Wellington Management ✦ | 1.79M | -57.5% | $209.52M | 0.0% | ▼ Trim | 3 | SEC ↗ ×5 |
| 5 | Dimensional Fund Advisors Lp | 1.47M | -22.3% | $171.26M | 0.0% | ▼ Trim | 2 | SEC ↗ ×5 |
| 6 | Vanguard Capital Management Llc | 1.46M | n/a | $170.04M | 0.0% | n/c | 1 | SEC ↗ |
| 7 | Goldman Sachs Group ✦ | 1.39M | +84.8% | $162.77M | 0.0% | ▲ Add | 3 | SEC ↗ ×5 |
| 8 | State Street Global Advisors ✦ (passive) | 1.38M | -1.2% | $161.27M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 9 | Fidelity (FMR) ✦ | 1.31M | +473.5% | $153.32M | 0.0% | ▲ Add | 4 | SEC ↗ ×6 |
| 10 | UBS AM, a distinct business unit of… | 981.40K | +6.1% | $114.65M | 0.0% | ▲ Add | 2 | SEC ↗ ×9 |
| 11 | MIRAE ASSET GLOBAL ETFS HOLDINGS… | 943.98K | +7.7% | $110.27M | 0.1% | ▲ Add | 2 | SEC ↗ ×2 |
| 12 | UBS Group AG | 811.27K | +25.2% | $94.77M | 0.0% | ▲ Add | 2 | SEC ↗ ×3 |
| 13 | Holocene Advisors, LP | 730.03K | -40.2% | $85.28M | 0.2% | ▼ Trim | 2 | SEC ↗ |
| 14 | Citadel Advisors ✦ | 715.59K | +252.0% | $83.59M | 0.1% | ▲ Add | 8 | SEC ↗ ×2 |
| 15 | Geode Capital Management ✦ (passive) | 614.33K | +3.3% | $71.78M | 0.0% | ▲ Add | 8 | SEC ↗ ×2 |
| 16 | Nuveen, LLC | 564.74K | -13.5% | $65.97M | 0.0% | ▼ Trim | 2 | SEC ↗ ×3 |
| 17 | Morgan Stanley ✦ | 486.51K | -36.0% | $56.83M | 0.0% | ▼ Trim | 3 | SEC ↗ ×11 |
| 18 | Schroder Investment Management Group | 374.51K | n/a | $43.44M | 0.0% | n/c | 1 | SEC ↗ |
| 19 | Balyasny Asset Management L.P. | 369.67K | New | $43.19M | 0.1% | New | 1 | SEC ↗ |
| 20 | Charles Schwab Investment… | 311.76K | +4.9% | $36.42M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 21 | New York State Common Retirement… | 309.63K | 0.0% | $36.17M | 0.1% | Held | 2 | SEC ↗ |
| 22 | ProShare Advisors LLC | 295.81K | -32.0% | $34.56M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 23 | Allspring Global Investments… | 285.43K | -43.7% | $33.28M | 0.1% | ▼ Trim | 2 | SEC ↗ ×2 |
| 24 | Janus Henderson Group Plc | 269.78K | -19.4% | $31.52M | 0.0% | ▼ Trim | 2 | SEC ↗ ×3 |
| 25 | Northern Trust Corp | 269.15K | +0.2% | $31.44M | 0.0% | ▲ Add | 2 | SEC ↗ ×5 |
| 26 | Federated Hermes, Inc. | 266.65K | +147.5% | $31.15M | 0.1% | ▲ Add | 2 | SEC ↗ ×2 |
| 27 | AQR Capital Management ✦ | 260.07K | +1166.5% | $30.38M | 0.0% | ▲ Add | 8 | SEC ↗ ×8 |
| 28 | Bank Of America Corp /De/ | 236.99K | +28.5% | $27.68M | 0.0% | ▲ Add | 2 | SEC ↗ ×3 |
| 29 | D. E. Shaw & Co. ✦ | 233.18K | -52.0% | $27.24M | 0.0% | ▼ Trim | 7 | SEC ↗ ×2 |
| 30 | Bank of New York Mellon Corp | 181.07K | +3.9% | $21.15M | 0.0% | ▲ Add | 2 | SEC ↗ ×13 |
| 31 | Invesco Ltd. | 179.40K | -15.8% | $20.96M | 0.0% | ▼ Trim | 2 | SEC ↗ ×7 |
| 32 | Man Group plc | 160.29K | New | $18.72M | 0.0% | New | 1 | SEC ↗ |
| 33 | Capstone Investment Advisors, Llc | 135.81K | +4254.2% | $15.87M | 0.2% | ▲ Add | 2 | SEC ↗ |
| 34 | Quantinno Capital Management LP | 121.44K | +4.4% | $14.19M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 35 | Wells Fargo & Company/Mn | 106.70K | +16.1% | $12.47M | 0.0% | ▲ Add | 2 | SEC ↗ ×4 |
| 36 | Jane Street Group, Llc | 105.69K | New | $12.35M | 0.0% | New | 1 | SEC ↗ ×2 |
| 37 | Royal Bank Of Canada | 103.95K | +21.9% | $12.14M | 0.0% | ▲ Add | 2 | SEC ↗ ×6 |
| 38 | First Trust Advisors Lp | 102.30K | -30.1% | $11.95M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 39 | JPMorgan Chase ✦ | 97.74K | +45.2% | $11.34M | 0.0% | ▲ Add | 3 | SEC ↗ ×8 |
| 40 | Russell Investments Group, Ltd. | 89.36K | -43.6% | $10.44M | 0.0% | ▼ Trim | 2 | SEC ↗ ×8 |
| 41 | Rhumbline Advisers | 87.30K | +2.2% | $10.20M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 42 | Millennium Management ✦ | 85.00K | -80.1% | $9.93M | 0.0% | ▼ Trim | 8 | SEC ↗ |
| 43 | Swiss National Bank | 75.90K | 0.0% | $8.87M | 0.0% | Held | 2 | SEC ↗ |
| 44 | Principal Financial Group Inc | 74.48K | +3.9% | $8.70M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 45 | Cerity Partners LLC | 72.68K | -42.8% | $8.49M | 0.0% | ▼ Trim | 2 | SEC ↗ ×2 |
| 46 | Mackenzie Financial Corp | 71.97K | +262.9% | $8.41M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 47 | Citigroup Inc | 54.56K | +99.6% | $6.37M | 0.0% | ▲ Add | 2 | SEC ↗ ×3 |
| 48 | Legal & General Group Plc | 50.74K | -11.4% | $5.93M | 0.0% | ▼ Trim | 2 | SEC ↗ ×3 |
| 49 | Tidal Investments LLC | 47.82K | New | $5.55M | 0.0% | New | 1 | SEC ↗ |
| 50 | Victory Capital Management Inc | 45.58K | -95.9% | $5.32M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 51 | California State Teachers… | 44.46K | +23.2% | $5.19M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 52 | Alliancebernstein L.P. | 67.31K | -1.7% | $4.98M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 53 | Bank Of Montreal /Can/ | 39.04K | +45.0% | $4.56M | 0.0% | ▲ Add | 2 | SEC ↗ ×5 |
| 54 | Squarepoint Ops LLC | 38.53K | New | $4.50M | 0.0% | New | 1 | SEC ↗ |
| 55 | Corient Private Wealth LP | 34.97K | -65.5% | $4.06M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 56 | Gotham Asset Management ✦ | 34.56K | +275.7% | $4.04M | 0.0% | ▲ Add | 8 | SEC ↗ |
| 57 | Manufacturers Life Insurance… | 33.30K | -0.5% | $3.89M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 58 | Boston Partners | 31.70K | New | $3.70M | 0.0% | New | 1 | SEC ↗ |
| 59 | Ameriprise Financial Inc | 28.49K | -42.0% | $3.33M | 0.0% | ▼ Trim | 2 | SEC ↗ ×2 |
| 60 | Envestnet Asset Management Inc | 28.05K | +0.6% | $3.28M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 61 | State Of Wisconsin Investment Board | 25.25K | -1.8% | $2.95M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 62 | California Public Employees… | 25.00K | -46.5% | $2.92M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 63 | Stifel Financial Corp | 24.93K | +31.7% | $2.91M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 64 | State Board Of Administration Of… | 24.11K | 0.0% | $2.82M | 0.0% | Held | 2 | SEC ↗ |
| 65 | Duquesne Family Office ✦ | 21.19K | New | $2.48M | 0.1% | New | 1 | SEC ↗ |
| 66 | American Century Companies Inc | 20.02K | +9.4% | $2.34M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 67 | Zurcher Kantonalbank (Zurich… | 19.17K | +43.4% | $2.24M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 68 | Fifth Third Bancorp | 16.05K | +2755.0% | $1.87M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 69 | Storebrand Asset Management As | 15.40K | 0.0% | $1.80M | 0.0% | Held | 2 | SEC ↗ |
| 70 | Susquehanna International Group, Llp | 15.00K | -37.0% | $1.75M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 71 | Barclays Plc | 14.46K | -78.3% | $1.69M | 0.0% | ▼ Trim | 2 | SEC ↗ ×3 |
| 72 | Nomura Asset Management… | 13.87K | New | $1.62M | 0.0% | New | 1 | SEC ↗ |
| 73 | LPL Financial LLC | 13.06K | +3.2% | $1.53M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 74 | Sei Investments Co | 12.77K | -55.1% | $1.49M | 0.0% | ▼ Trim | 2 | SEC ↗ ×2 |
| 75 | Universal- Beteiligungs- und… | 12.48K | +35.9% | $1.46M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 76 | Creative Planning | 11.96K | +55.6% | $1.40M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 77 | Mitsubishi UFJ Asset Management… | 11.26K | +12.8% | $1.32M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 78 | First Eagle Investment Management… | 7.12K | +13330.2% | $831,524 | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 79 | Bnp Paribas Financial Markets | 6.69K | -92.8% | $781,526 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 80 | Pictet Asset Management Holding SA | 6.06K | +0.6% | $707,812 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 81 | Mercer Global Advisors Inc /Adv | 5.72K | +45.7% | $667,802 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 82 | CIBC Asset Management Inc | 3.98K | 0.0% | $464,593 | 0.0% | Held | 2 | SEC ↗ |
| 83 | Cetera Investment Advisers | 3.92K | +24.3% | $458,033 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 84 | Pacer Advisors, Inc. | 3.84K | -3.6% | $449,000 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 85 | GAMCO Investors ✦ | 3.49K | -11.4% | $407,819 | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 86 | Raymond James Financial Inc | 2.93K | -6.1% | $342,406 | 0.0% | ▼ Trim | 2 | SEC ↗ ×2 |
| 87 | Wealth Enhancement Advisory… | 2.59K | New | $309,007 | 0.0% | New | 1 | SEC ↗ |
| 88 | Voya Investment Management Llc | 2.44K | New | $284,574 | 0.0% | New | 1 | SEC ↗ |
| 89 | Deutsche Bank Ag\ | 2.37K | +118.6% | $276,864 | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 90 | HighTower Advisors, LLC | 2.31K | New | $269,270 | 0.0% | New | 1 | SEC ↗ |
| 91 | Cwm, Llc | 2.25K | +550.0% | $262,728 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 92 | Prudential Financial Inc | 2.23K | New | $260,275 | 0.0% | New | 1 | SEC ↗ |
| 93 | Brown Advisory Inc | 2.23K | New | $260,073 | 0.0% | New | 1 | SEC ↗ |
| 94 | Canada Pension Plan Investment Board | 2.21K | -72.1% | $258,172 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 95 | Us Bancorp \De\ | 2.17K | +8.0% | $253,500 | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 96 | Amundi | 2.00K | New | $233,290 | 0.0% | New | 1 | SEC ↗ |
| 97 | Pnc Financial Services Group, Inc. | 1.52K | +14.0% | $177,799 | 0.0% | ▲ Add | 2 | SEC ↗ ×4 |
| 98 | TD Waterhouse Canada Inc. | 1.38K | +3337.5% | $160,051 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 99 | Rockefeller Capital Management L.P. | 857 | -10.3% | $100,140 | 0.0% | ▼ Trim | 2 | SEC ↗ ×2 |
| 100 | Nomura Asset Management Co Ltd | 670 | -25.2% | $78,269 | 0.0% | ▼ Trim | 2 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value: the conviction measure. ✦ = curated manager.
New buyers
| Balyasny Asset Management L.P. | $43.19M | 0.1% |
| Man Group plc | $18.72M | 0.0% |
| Jane Street Group, Llc | $12.35M | 0.0% |
| Tidal Investments LLC | $5.55M | 0.0% |
| Squarepoint Ops LLC | $4.50M | 0.0% |
| Boston Partners | $3.70M | 0.0% |
| Duquesne Family Office | $2.48M | 0.1% |
| Nomura Asset Management… | $1.62M | 0.0% |
| Wealth Enhancement Advisory… | $309,007 | 0.0% |
| Voya Investment Management Llc | $284,574 | 0.0% |
| HighTower Advisors, LLC | $269,270 | 0.0% |
| Prudential Financial Inc | $260,275 | 0.0% |
Exited
| Two Sigma Investments | $14.67M | was 0.0% |
| Norges Bank | $13.41M | was 0.0% |
| Alyeska Investment Group, L.P. | $7.62M | was 0.0% |
| Lazard Asset Management Llc | $5.50M | was 0.0% |
| Daiwa Securities Group Inc. | $304,000 | was 0.0% |
| Assenagon Asset Management… | $280,233 | was 0.0% |
| Simplex Trading, Llc | $146,475 | 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: Q1 2026 ·
Methodology ·
Get this via the API