Westlake (WLK)
Links chemical feedstocks to materials, building products, pipe and fittings across an integrated portfolio.
$69.08
vs last close+0.28 (+0.41%)
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13F · 13D/G · Form 4
| Institutions | ≈ 30.93% | 39.53M shares | |
|---|---|---|---|
| 367 holders · as of Jun 30, 2026 · largest filers plus last quarter's tail | |||
| Insiders | 74.29% | 94.94M shares | |
| 18 holders · as of Aug 11, 2026 | |||
| Adds to | 105.22% | ||
127.80M company shares as of Sep 23, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing
This quarter's institutional total failed a plausibility check; shown: the largest filers plus last quarter's remainder.
These groups come from separate filings that can overlap, so they add to 105.22%; nothing is left for Other.
13F, as of Jun 30, 2026
367 holders · 39.53M shares · 87 new positions · 197 increased · 120 reduced · 65 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 3.29M | 2.58% | +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 | 1.73% | −200.8K | Aug 14, 2026 |
| Orbis Allan Gray Ltd | 2.08M | 1.63% | −3.21M | Aug 14, 2026 |
| Dimensional Fund Advisors LP | 2.05M | 1.61% | +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 |
13D/G · 5% or more, as filed
No 13D/G filer at 5% or more on record.
Form 4
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 |
House and Senate disclosures
Not reported.