WLK insider buying and SEC filings, explained
Westlake Corp. · CIK 1262823
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$0
Insiders who bought
0
Sold (not marked 10b5-1)
$4.1M
Planned sales (10b5-1)
$0
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Mar 27, 2026 | Sale | Robert F. Buesinger (EVP, PEM Segment Head) sold 4,000 shares at $115.25 ($461K). Holdings down 10% to 34,482 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 31, 2026 |
| Mar 27, 2026 | Sale | Mark Steven Bender (CFO) sold 16,413 shares at about $112.54 ($1.8M). Holdings down 37% to 28,015 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 30, 2026 |
| Feb 27, 2026 | Sale | Mark Steven Bender (CFO) sold 17,409 shares at about $100.92 ($1.8M). Holdings down 28% to 44,433 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 2, 2026 |
48 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
No cluster buys in the last 12 months.
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
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