Westlake
Links chemical feedstocks to materials, building products, pipe and fittings across an integrated portfolio.
$75.71
After-hours close−0.05 (−0.07%)
At close$75.76(+2.48%)
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Breakdown13F · Form 4
Institutions 33.35%42.73M sharesInsiders 0.77%985.3K sharesOther 65.88%84.41M shares
Shares outstanding 128.12M · Float 33.03M · 25.8% free float
Institutions13F, as of Jun 30, 2026
365 holders · 42.73M shares · 87 new positions · 197 increased · 120 reduced · 66 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 3.29M | 2.57% | +215.1K | Aug 7, 2026 |
| Capital World Investors | 2.84M | 2.22% | −1.37M | Aug 12, 2026 |
| Price T Rowe Associates Inc /MD/ | 2.21M | 1.72% | −200.8K | Aug 14, 2026 |
| Orbis Allan Gray Ltd | 2.08M | 1.63% | −3.21M | Aug 14, 2026 |
| Dimensional Fund Advisors LP | 2.05M | 1.60% | +585.5K | Aug 11, 2026 |
| Vanguard Portfolio Management LLC | 1.75M | 1.37% | −17.2K | Aug 13, 2026 |
| Brandes Investment Partners, LP | 1.57M | 1.23% | −269.7K | Aug 14, 2026 |
| AQR Capital Management LLC | 1.57M | 1.23% | +1.31M | Aug 14, 2026 |
Beneficial owners13D/G · 5% or more, as filed
No 13D/G filer at 5% or more on record.
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Albert Chao | director, officer: Executive Chairman | 642.9K | 0.50% | Aug 11, 2026 |
| L. Benjamin Ederington | officer: EVP, Legal & External Affairs | 80.2K | 0.06% | Feb 23, 2026 |
| James Chao | director, officer: Senior Chairman | 49.8K | 0.04% | Feb 23, 2026 |
| Mark Steven Bender | officer: EVP & CFO | 35.9K | 0.03% | May 14, 2026 |
| Robert F. Buesinger | officer: EVP, PEM Segment Head | 34.5K | 0.03% | Mar 31, 2026 |
| R. Bruce Northcutt | director | 23.4K | 0.02% | Aug 10, 2026 |
| Michael J. Graff | director | 23.3K | 0.02% | Aug 10, 2026 |
| Jeffrey Wayne Sheets | director | 14.9K | 0.01% | Aug 10, 2026 |
| Kimberly S. Lubel | director | 13.8K | 0.01% | Aug 10, 2026 |
| Scott Thomas Szwejbka | officer: SVP, HIP Segment Head | 13.8K | 0.01% | Feb 23, 2026 |
2 ten-percent owners hold 93.41M shares by Form 4, outside the officers-and-directors figure above · 24 people have not refiled in the last 18 months (517.1K shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 11, 2026 | Albert Chaodirector, officer: Executive Chairman | Sale · 2 lots | 38,873 | $80.28 | 642,880 |
| Mar 27, 2026 | Robert F. Buesingerofficer: EVP, PEM Segment Head | Sale | 4,000 | $115.25 | 34,482 |
| Mar 27, 2026 | Mark Steven Benderofficer: EVP & CFO | Sale | 16,413 | $112.54 | 28,015 |
| Feb 27, 2026 | Mark Steven Benderofficer: EVP & CFO | Sale · 2 lots | 17,409 | $100.92 | 44,433 |
| Dec 22, 2025 | Albert Chaodirector, officer: Executive Chairman | Sale · 3 lots | 40,836 | $73.57 | 627,722 |
CongressHouse and Senate disclosures
Not reported.