WLK
WESTLAKE CORP · Manufacturing · Market cap $9.0B
Insiders sold $3.1M net in the last 90 days ·1 seller, 0 buyers· latest Form 4 filed Aug 11, 2026
Insider Buying
$0
reported purchases (SEC code P)
Insider Selling
$10.2M
reported sales (SEC code S)
Unique Insiders
3
in the rolling window
Latest filing
Aug 11, 2026
Chao Albert
WESTLAKE CORP (WLK) has 34 SEC Form 4 filings (61 transaction rows) in the rolling window, disclosed by 3 distinct insiders. Most recent filing: Aug 11, 2026.
Inside the rolling window, 3 insiders at WESTLAKE CORP reported no open-market purchases and 5 open-market sales totaling $10.2M. Insiders have net sold $7.2M over the trailing 6 months. The most recent open-market filing is a sale of 38,873 shares by Executive Chairman Chao Albert, dated Aug 11, 2026, worth $3.1M.
- Industry:Chemicals - Specialty
- CEO:Jean-Marc Gilson
- Employees:14,600
- HQ:Houston, TX, US
- IPO:2004-08-12
| Source | |||||||
|---|---|---|---|---|---|---|---|
Chao AlbertFirst in 8 months | Executive Chairman | Sale | 38,873 | $3.1M | Aug 11 | -12.6% | SEC ↗ |
Buesinger Robert F.First filing | EVP, PEM Segment Head | Sale | 4,000 | $461K | Mar 31 | -39.5% | SEC ↗ |
| EVP & CFO | Sale | 16,413 | $1.8M | Mar 30 | -39.1% | SEC ↗ | |
Bender Mark StevenFirst filing | EVP & CFO | Sale | 17,409 | $1.8M | Mar 2 | -33.8% | SEC ↗ |
Chao AlbertFirst filing | Executive Chairman | Sale | 40,836 | $3.0M | Dec 23 | -3.6% | SEC ↗ |
Congress trading WLK 32 all-time
- DRep. Susie LeeOther$1,001 - $15,0002021-06-10
- RRep. Peter MeijerOther$1,001 - $15,0002021-02-16
- DRep. Susie LeePurchase$1,001 - $15,0002020-12-10
- DRep. Susie LeePurchase$1,001 - $15,0002020-12-16
- RRep. James ComerOther$1,001 - $15,0002020-08-06
- RRep. James ComerPurchase$1,001 - $15,0002020-02-24
STOCK Act disclosures are filed up to 45 days after the trade. Amount is a disclosed range, not an exact figure.
Frequently asked questions
How many SEC Form 4 insider filings does WLK have?
WESTLAKE CORP (WLK) has 34 SEC Form 4 filings (61 transaction rows) in the rolling 365-day window, disclosed by 3 distinct insiders. Most recent filing: Aug 11, 2026.
When was the most recent SEC Form 4 filing for WLK?
The most recent Form 4 filing for WLK on Tracefour is dated Aug 11, 2026.
What is the net insider flow at WLK over the last 6 months?
Over the trailing 180 days, insiders at WLK have net sold $7.2M based on SEC Form 4 disclosures.
What is the total insider buy and sell value at WLK in the current window?
Inside the rolling window, insiders at WLK bought $0 and sold $10.2M based on SEC Form 4 filings.
Can I get alerts for WLK insider trading?
Yes. Tracefour sends a free email when a new SEC Form 4 purchase or sale is filed at WESTLAKE CORP (WLK). Alerts are set per company from the page itself, there is no paid tier, and each email links to the original filing on SEC EDGAR.
Related companies
WESTLAKE CORP is in the Manufacturing sector.