Who holds it, who is betting against it, and where the big money is moving
Net of large-order buying minus selling, in USD. Over this window: −$592.8K (3 inflow days, 17 outflow days).
Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.
The five largest holders on file together own 66.5% of shares outstanding.
Reported short interest has held roughly steady near 0.38% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).
| Holder | Type | Period | Share change | New stake |
|---|---|---|---|---|
| Harbor Capital Advisors, Inc. | Mutual Fund | 2026/Q3 | +960 | 0.0% |
| George Finley | Individual/Insider | 2026/Q3 | +5,005 | 0.1% |
| Lisa Friel | Individual/Insider | 2026/Q3 | +2,503 | 0.0% |
| Mirae Asset Global Investments Co., Ltd | Mutual Fund | 2026/Q3 | +28,057 | 2.0% |
| Arax Advisory Partners, LLC | Mutual Fund | 2026/Q3 | +25,600 | 0.1% |
| Pekin Hardy Strauss, Inc. | Mutual Fund | 2026/Q3 | +20,386 | 0.1% |
| The Goldman Sachs Group, Inc. | Public Company | 2026/Q3 | +18,705 | 0.7% |
| Advisory Services Network, LLC | Mutual Fund | 2026/Q3 | +18,700 | 0.2% |
| &Partners, LLC | Private Company | 2026/Q3 | +15,660 | 0.0% |
| Envestnet Asset Management, Inc. | Mutual Fund | 2026/Q3 | +9,683 | 0.1% |
| Arrow Investment Advisors, LLC | Mutual Fund | 2026/Q3 | +9,084 | 0.0% |
| Energy Income Partners LLC | Mutual Fund | 2026/Q3 | +7,559 | 4.5% |
| Inspire Investing, LLC | Mutual Fund | 2026/Q3 | +4,267 | 0.0% |
| Apollon Wealth Management, LLC | Mutual Fund | 2026/Q3 | +2,435 | 0.1% |
| Osaic Wealth, Inc. | Private Company | 2026/Q3 | +1,391 | 0.0% |
Institutional buy/sell activity by reporting period, largest moves first.
| Date | Insider | Title | Transaction | Shares | Price | Held after |
|---|---|---|---|---|---|---|
| 11 Aug 2026 | George Finley | Independent Director of Westlake Chemical Partners GP LLC | Other Derivative Acquisition | +5,044 | – | – |
| 11 Aug 2026 | Randy Woelfel | Independent Director of Westlake Chemical Partners GP LLC | Other Derivative Acquisition | +5,044 | – | – |
| 11 Aug 2026 | Lisa Friel | Independent Director of Westlake Chemical Partners GP LLC | Other Derivative Acquisition | +5,044 | – | – |
| 5 Aug 2026 | George Finley | Independent Director of Westlake Chemical Partners GP LLC | Derivative Exercise and Retained | +5,005 | – | 36,935 |
| 5 Aug 2026 | Randy Woelfel | Independent Director of Westlake Chemical Partners GP LLC | Derivative Exercise and Sale | -5,005 | $21.35 | 23,913 |
| 5 Aug 2026 | Lisa Friel | Independent Director of Westlake Chemical Partners GP LLC | Derivative Exercise and Sale | -2,502 | $21.35 | 9,666 |
| 5 Aug 2026 | Lisa Friel | Independent Director of Westlake Chemical Partners GP LLC | Derivative Exercise and Retained | +2,503 | – | 9,666 |
| 26 Aug 2025 | Jean-Marc Gilson | Chief Executive Officer | Private Acquisition | +95 | $21.25 | 11,803 |
| 6 Aug 2025 | George Finley | Independent Director of Westlake Chemical Partners GP LLC | Derivative Exercise and Retained | +4,882 | – | 31,930 |
| 6 Aug 2025 | Randy Woelfel | Independent Director of Westlake Chemical Partners GP LLC | Derivative Exercise and Sale | -4,882 | $21.96 | 23,913 |
| 6 Aug 2025 | Lisa Friel | Independent Director of Westlake Chemical Partners GP LLC | Derivative Exercise and Sale | -2,441 | $21.96 | 7,163 |
| 6 Aug 2025 | Lisa Friel | Independent Director of Westlake Chemical Partners GP LLC | Derivative Exercise and Retained | +2,441 | – | 7,163 |
| 5 Aug 2025 | George Finley | Independent Director of Westlake Chemical Partners GP LLC | Other Derivative Acquisition | +5,005 | – | – |
| 5 Aug 2025 | Randy Woelfel | Independent Director of Westlake Chemical Partners GP LLC | Other Derivative Acquisition | +5,005 | – | – |
| 5 Aug 2025 | Lisa Friel | Independent Director of Westlake Chemical Partners GP LLC | Other Derivative Acquisition | +5,005 | – | – |
| 28 May 2025 | James Chao | Senior Chairman of the Board | Open Market Disposition | -3,700 | $22.10 | – |
| 27 May 2025 | James Chao | Senior Chairman of the Board | Open Market Disposition | -10,208 | $22.17 | 3,700 |
| 26 May 2025 | James Chao | Senior Chairman of the Board | Intent to Sell (Form 144) | -13,908 | $22.18 | – |
| 24 Feb 2025 | Jean-Marc Gilson | Chief Executive Officer | Private Acquisition | +167 | $24.75 | 11,708 |
From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.
| Report date | Shares short | % of float | Days to cover |
|---|---|---|---|
| 15 Sep 2026 | 133,662 | 0.4% | 6.2 |
| 31 Aug 2026 | 134,745 | 0.4% | 5.1 |
| 14 Aug 2026 | 120,891 | 0.3% | 2.4 |
| 31 Jul 2026 | 110,675 | 0.3% | 3.1 |
| 15 Jul 2026 | 145,067 | 0.4% | 5.8 |
| 30 Jun 2026 | 128,063 | 0.4% | 5.7 |
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