Michael Martin Breen
CIK 1863633 · CEO and Director · last filed 2025-09-08
Michael Martin Breen is a CEO and Director who has filed 7 SEC Form 4 insider transactions across 1 company since 2021. The most recent filing, for GTBP, was dated Sep 8, 2025. Across all open-market trades the lifetime net is +$25.0K, making them a net buyer over the disclosed history. Current disclosed insider exposure totals $382.7K across reported positions.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
$382.7K
1
7
$25.0K
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| GTBP | CEO and Director | 856,218 | $0.45 | $382.7K | $25.0K | 6 | 2025-09-08 |
Recent Filings
7 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2025-09-08 | GTBP | Grant (A) | — | $0 | EDGAR |
| 2023-08-15 | GTBP | Grant (A) | +200,000 | $57.4K | EDGAR |
| 2023-05-05 | — | Mixed | +1,134,683 | $138.1K | |
| 2023-04-11 | GTBP | Buy (P) | +50,000 | $25.0K | EDGAR |
| 2023-02-01 | GTBP | Grant (A) | — | $0 | EDGAR |
| 2022-07-19 | GTBP | Grant (A) | +278,058 | $0 | EDGAR |
| 2021-11-12 | GTBP | Mixed | +328,160 | $170.3K | EDGAR |