Insiders who reported open-market trades in the last 12 months at the companies Thomas P. Gallagher 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.
Thomas P. Gallagher is a corporate insider, tracked as Chairman & CEO, Director of MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX). InsiderAlpha holds 16 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Thomas P. Gallagher submitted recently?
3 primary Form 4 filings in the last 90 days, covering 1 company.
Has Thomas P. Gallagher been buying or selling stock?
Recorded transactions: 1 open-market purchase ($276K) and 12 open-market sales ($32.30M) across all tracked filings.
Thomas P. Gallagher is Chairman & CEO, Director of MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX). 16 SEC Form 4 filings on record going back to 2025, most recently on 4 September 2026. Most recent open-market trade: sold $1.99M of MIAX on 4 September 2026. Lifetime open-market purchases: $276K. Lifetime open-market sales: $32.30M.
Recent transactions
20
The latest 20 SEC Form 4 transactions reported by Thomas P. Gallagher.
InsiderAlpha's records for Thomas P. Gallagher go back to 2025: 16 primary Form 4 filings, an average of 8.0 per year. The typical open-market purchase is $276K (1 buy totaling $276K). The largest single buy on record is $276K of MIAX in 2025. Sales side: 12 recorded sales totaling $32.30M, so the filing history runs sell-heavy by dollar value. 39 recorded transactions carry a Rule 10b5-1 plan flag. This identifies the marked transactions as reported under a trading plan; it does not establish the plan status of unmarked transactions.
