Summary
Updated Aug 31, 2026
Oscar Leland Mahan files SEC Form 4 reports at John Marshall Bancorp, Inc. (JMSB). 6 SEC Form 4 filings on record going back to 2024, most recently on 5 June 2026. Most recent open-market trade: bought $4K of JMSB on 5 June 2026. Lifetime open-market purchases: $29K. Lifetime open-market sales: $367K.
Recent Transactions
20Every recent SEC Form 4 transaction Oscar Leland Mahan has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Oscar Leland Mahan go back to 2024: 6 primary Form 4 filings, an average of 2.0 per year. The typical open-market purchase is $10K (3 buys totaling $29K). The largest single buy on record is $13K of JMSB in 2025. Sales side: 83 recorded sales totaling $367K, 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 Oscar Leland Mahan 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.
- Jonathan Craig Kinney - $170K of JMSB open-market activity in the last 12 months
- Philip Chase - $3K of JMSB 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 Oscar Leland Mahan?
Oscar Leland Mahan is a corporate insider of John Marshall Bancorp, Inc. (JMSB). InsiderAlpha holds 6 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Oscar Leland Mahan submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Has Oscar Leland Mahan been buying or selling stock?
Recorded transactions: 3 open-market purchases ($29K) and 83 open-market sales ($367K) across all tracked filings.
Where can I see all of Oscar Leland Mahan'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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