Summary
Updated Aug 30, 2026
John Tsung-Chen Chao files SEC Form 4 reports at WESTLAKE CORP (WLK). 2 SEC Form 4 filings on record, most recently on 23 February 2026.
Recent Transactions
4Every recent SEC Form 4 transaction John Tsung-Chen Chao has reported, most recent first.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies John Tsung-Chen Chao files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Albert Chao - $6.13M of WLK open-market activity in the last 12 months
- Mark Steven Bender - $3.60M of WLK open-market activity in the last 12 months
- Robert F. Buesinger - $461K of WLK open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is John Tsung-Chen Chao?
John Tsung-Chen Chao is a corporate insider of WESTLAKE CORP (WLK). InsiderAlpha holds 2 primary Form 4 filings for them, the earliest from 2026, updated as new SEC EDGAR filings are processed.
When did John Tsung-Chen Chao last file a Form 4?
The most recent primary Form 4 on record is dated 23 February 2026, one of 2 filings going back to 2026.
Where can I see all of John Tsung-Chen Chao's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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