Michael Martin Breen
CIK 1863633 · View on SEC EDGAR ↗
Insider
First SEC filing: Nov. 12, 2021 · Latest: Nov. 12, 2021
On this page
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 8 non-open-market transactions below
last 12 months, based on the transactions shown below
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
8 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| May 3, 2023 | PROP | P | 916,112 | $0.11 | $100,772 | 926,112 Direct | +9161.12% | Acquired | -82.7% (price as of 2026-08-24) |
| April 11, 2023 | GTBP | P | 50,000 | $0.50 | $25,000 | 656,218 Direct | +8.25% | Acquired | -98.1% (price as of 2026-08-24) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II)
Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| Jan. 27, 2023 | GTBP | Option to purchase Common Stock | Common Stock (500,000) | $0.84 | Jan. 26, 2033 | 500,000 | Acquired |
| July 15, 2022 | GTBP | Option to purchase Common Stock | Common Stock (50,000) | $2.48 | July 14, 2032 | 50,000 | Acquired |
| Aug. 3, 2020 | PROP | Stock Option (Right to Buy | Common Stock (37,500) | $0.25 | Aug. 2, 2025 | 37,500 | Acquired |
| Sept. 12, 2019 | PROP | Stock Option (Right to Buy | Common Stock (15,000) | $0.25 | Sept. 12, 2024 | 15,000 | Acquired |
| Oct. 16, 2018 | PROP | Stock Option (Right to Buy) | Common Stock (15,000) | $0.25 | Oct. 15, 2023 | 15,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 2 holdings
Securities held when first becoming an insider, per SEC Form 3.