Mark Steven Bender sold $1.8M of WLK
EVP & CFO at WESTLAKE CORP. 17,409 shares at an average of $100.92, traded Feb 27, 2026, filed Mar 2, 2026.
Score components
- +22RoleCFO
- +25Trade size$1.8M at market
- +10Share of holdings soldSold 28% of holdings
- 0ClusterNo other insider selling within 14 days
- -15Exercise and sellShares came from an option exercise in the same filing
What happened after comparable sells
Same side and tier, against the S&P 500, at 1, 3 and 6 months. Shown to Pro users; the whole table is on the backtest page.
Price around the trade, and since
From a quarter before the trade to today. The arrow is the trade, the circle the day the filing reached EDGAR, which is the first day anyone outside could act; the dotted line is the S&P 500 rebased to that day's close.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value; the dashed line is the close on the filing day, the dotted line SPY rebased to it.Charts by TradingView Lightweight Charts™
Rows in this filing
Every transaction in Form 4 0001193125-26-084672, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| Feb 27, 2026 | MOption exercise Common Stock | +6,199 | $65.81 | $408k | 68,041 | Mar 2, 2026 |
| Feb 27, 2026 | MOption exercise Common Stock | +6,494 | $86.54 | $562k | 74,535 | Mar 2, 2026 |
| Feb 27, 2026 | DDisposition to issuer Common Stock | -12,693 | $98.20 | $1.2M | 61,842 | Mar 2, 2026 |
| Feb 27, 2026 | SOpen-market sale Common Stock | -16,988 | $100.91 | $1.7M | 44,854 | Mar 2, 2026 |
| Feb 27, 2026 | SOpen-market sale Common Stock | -421 | $101.52 | $43k | 44,433 | Mar 2, 2026 |
| Feb 27, 2026 | MOption exercise Employee Option (right to buy)derivative | -6,199 | $0.00 | $0 | 0 | Mar 2, 2026 |
| Feb 27, 2026 | MOption exercise Employee Option (right to buy)derivative | -6,494 | $0.00 | $0 | 0 | Mar 2, 2026 |
Related signals
Other insiders at WESTLAKE CORP and this insider’s other filings.
| Score | Company | Insider | Value | Holdings | Filed |
|---|---|---|---|---|---|
| 45Moderate | WESTLAKE CORP | Robert F. Buesinger EVP, PEM Segment Head | $461k 4,000 shares | -10% | |
| 65Notable | WESTLAKE CORP | Mark Steven Bender EVP & CFO | $1.8M 16,413 shares | -37% | |
| 30Weak | WLKsell WESTLAKE CORP | Albert Chao Executive Chairman | $3.0M 40,836 shares | -6% | |
| 31Weak | WLKbuy WESTLAKE CORP | Robert F. Buesinger EVP, PEM Segment Head | $7,751 83 shares | - | |
| 35Weak | WLKsell WESTLAKE CORP | Robert F. Buesinger EVP, PEM Segment Head | $6,034 83 shares | -100% | |
| 33Weak | WLKsell WESTLAKE CORP | David Tsung-Hung Chao director | $226k 1,750 shares | -18% | |
| 33Weak | WLKsell WESTLAKE CORP | David Tsung-Hung Chao director | $228k 1,750 shares | -16% |
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.