Summary
Updated Aug 31, 2026
Robert F. Buesinger is EVP, PEM Segment Head of WESTLAKE CORP (WLK). 5 SEC Form 4 filings on record going back to 2025, most recently on 31 March 2026. Most recent open-market trade: sold $461K of WLK on 31 March 2026. Lifetime open-market purchases: $8K. Lifetime open-market sales: $467K.
Recent Transactions
7Every recent SEC Form 4 transaction Robert F. Buesinger has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Robert F. Buesinger go back to 2025: 5 primary Form 4 filings, an average of 2.5 per year. The typical open-market purchase is $8K (1 buy totaling $8K). The largest single buy on record is $8K of WLK in 2025. Sales side: 2 recorded sales totaling $467K, so the filing history runs sell-heavy by dollar value. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Robert F. Buesinger 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
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Robert F. Buesinger?
Robert F. Buesinger is a corporate insider, tracked as EVP, PEM Segment Head of WESTLAKE CORP (WLK). InsiderAlpha holds 5 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did Robert F. Buesinger last file a Form 4?
The most recent primary Form 4 on record is dated 31 March 2026, one of 5 filings going back to 2025.
Has Robert F. Buesinger been buying or selling stock?
Recorded transactions: 1 open-market purchase ($8K) and 2 open-market sales ($467K) across all tracked filings.
Where can I see all of Robert F. Buesinger'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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