As of the latest Form 4 filed Aug 29, 2025.
What Westlake Chemical Partners LP insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 12 most recent filings for WLKP.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2025-08-29 | 2025-08-27 | Gilson Jean-Marc President and CEO | PPurchase | +95.29 | $21.25 | $2.02K | No | Form 4 ↗ |
| 2025-08-28 | 2025-08-21 | Gilson Jean-Marc President and CEO | PPurchase | +1.25K | $22.02 | $27.5K | No | Form 4 ↗ |
| 2025-08-28 | 2025-08-20 | Gilson Jean-Marc, President and CEO | PPurchase | +1.25K | $21.86 | $27.3K | No | Form 4 ↗ |
| 2025-08-28 | 2025-08-15 | Gilson Jean-Marc, President and CEO | PPurchase | +4.70K | $21.84 | $103K | No | Form 4 ↗ |
| 2025-08-28 | 2025-05-29 | Gilson Jean-Marc, President and CEO | PPurchase | +93.73 | $22.20 | $2.08K | No | Form 4 ↗ |
| 2025-08-28 | 2025-02-25 | Gilson Jean-Marc, President and CEO | PPurchase | +82.51 | $24.75 | $2.04K | No | Form 4 ↗ |
| 2025-08-28 | 2024-11-27 | Gilson Jean-Marc, President and CEO | PPurchase | +84.96 | $23.57 | $2.00K | No | Form 4 ↗ |
| 2025-08-08 | 2025-08-07 | Friel Lisa A. Director | DDisposition | −2.44K | $21.96 | $53.6K | No | Form 4 ↗ |
| 2025-08-08 | 2025-08-07 | Friel Lisa A., Director | MExercise | +4.88K | — | — | No | Form 4 ↗ |
| 2025-08-08 | 2025-08-07 | WOELFEL RANDY Director | DDisposition | −4.88K | $21.96 | $107K | No | Form 4 ↗ |
| 2025-08-08 | 2025-08-07 | WOELFEL RANDY, Director | MExercise | +4.88K | — | — | No | Form 4 ↗ |
| 2025-08-08 | 2025-08-07 | FINLEY G STEPHEN Director | MExercise | +4.88K | — | — | No | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also WLKP’s full analysis or the market-wide insider trading feed. The tabs above jump to WLKP’s other SEC data.
Source: SEC Form 4 filings for WLKP, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
Research and education only — not financial advice. TENKis not a registered investment adviser or broker-dealer and gives no personalized advice. Every call is impersonal — identical for all users, generated on a schedule from SEC filings plus a delayed/third-party price feed — may be wrong or out of date, and is not a recommendation to buy or sell any security. The operator and an affiliated trading operation may hold or trade the securities TENK rates; see Disclosures. Past performance does not guarantee future results. Do your own research.