Company profile
Westlake Corp Insider Trading
WLKEvery SEC Form 4 insider trading filing for Westlake Corp (WLK) since April 2023 — open-market buys and sells by directors and officers, option exercises, and cluster activity, updated as each filing is reported to the SEC. Why 2023?
- Exchange
- NYSE
- Sector
- Industrial Organic Chemicals
- CIK
- 0001262823
- Filings
- 166
- Insiders
- 25
- Last filing
- 2026-08-31
Activity summary
Recent insider activity is bullish. Over the last 30 days, 1 insider purchased shares. Buying was led by Tommy Darby.
Three year balance
Buy and sell value by quarter, Q4 23 to Q3 26. Westlake Corp insiders are net sellers across the period shown.
Bars below the rule are sales, above are purchases. Largest quarter on the chart is $11.2M.
90 day insight
Over the last 90 days, Westlake Corp insiders bought $2.4M (31 transactions) and sold $3.1M (2 transactions).
- Most active insider: Albert Chao with 4 transactions totaling $5.5M.
- Largest single sale: $2.5M by Albert Chao on Aug 11, 2026.
Activity skews bullish — buys outpace sales.
Insider Transactions
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 31, 2026 | Tommy Darby | WLK | Award | 1,791 | — | — |
| Aug 14, 2026 | Catherine T. Chao | WLK | Award | 2,184 | — | — |
| Aug 14, 2026 | Bhavesh Patel V. | WLK | Award | 2,184 | — | — |
| Aug 14, 2026 | R Bruce Northcutt | WLK | Award | 2,184 | — | — |
| Aug 14, 2026 | Mark A McCollum | WLK | Award | 2,184 | — | — |
45 more transactions hidden
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-H "X-Api-Key: $KEY"Top insiders
By total value filed.
Institutional Ownership
Top 13F-HR holders of Westlake Corp as of 2026-06-30
Data source: quarterly 13F-HR filings — institutional holders report positions within 45 days of quarter end. Joined with insider activity above — see who's loading up institutionally while insiders are trading. Full 13F-HR API →