Michael S. Weiss
CEO and President at TG Therapeutics Inc.
Sits on 3 boards. Last updated September 28, 2026
Time on boards
- Boards served
- 3
- Current seats
- 3
- Board service
- 17 years
- Director since
- 2016
17 years of board service in total across 3 boards, counting each seat separately. Longest: Mustang Bio Inc., 10 years.
Chief executive roles
Shareholder support
Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
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Fortress Biotech Inc. May 23, 202495.7%
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
| Date | Company | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Mar 18, 2026 | Fortress Biotech Inc. | Grant or award | +475,424 | — | — |
| Jan 8, 2026 | TG Therapeutics Inc. | Grant or award | +622,000 | — | — |
| Nov 5, 2025 | TG Therapeutics Inc. | Gift | −3,865,126 | — | — |
| Nov 5, 2025 | TG Therapeutics Inc. | Gift | −803,717 | — | — |
| Jan 29, 2025 | TG Therapeutics Inc. | Grant or award | +750,000 | — | — |
| Jan 1, 2025 | Fortress Biotech Inc. | Grant or award | +454,153 | — | — |
| Jan 6, 2024 | TG Therapeutics Inc. | Grant or award | +1,001,908 | — | — |
| Jan 1, 2024 | Fortress Biotech Inc. | Grant or award | +216,465 | — | — |
| Nov 14, 2023 | Fortress Biotech Inc. | Open-market purchase | +147,058 | $1.70 | $249,999 |
| Aug 11, 2023 | TG Therapeutics Inc. | Open-market purchase | +100,000 | $10.13 | $1,013,000 |
| Jul 5, 2023 | Mustang Bio Inc. | Grant or award | +7,246 | — | — |
| Mar 12, 2023 | TG Therapeutics Inc. | Grant or award | +985,000 | — | — |
| Feb 10, 2023 | Fortress Biotech Inc. | Open-market purchase | +1,197,604 | $0.84 | $1,005,987 |
| Jan 1, 2023 | Fortress Biotech Inc. | Grant or award | +1,219,294 | — | — |
| Jul 29, 2022 | Mustang Bio Inc. | Grant or award | +71,664 | — | — |
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