Michael S. Weiss

Companies

• Checkpoint Therapeutics, Inc.Board member Jun 15, 2017 to now¹
• Fortress BiotechExec. VC - Strategic Dev. Feb 24, 2014 to now²
• Fortress BiotechBoard member Dec 23, 2013 to now³
• TG TherapeuticsChief executive officer Jan 2, 2013 to now⁴
• TG TherapeuticsBoard member Jan 9, 2012 to now⁵
• TG TherapeuticsPresident Jan 4, 2017 to Aug 14, 2023⁶
• MUSTANG BIO, INC.Board member Jan 17, 2020 to Jul 7, 2023⁷
• AVENUE THERAPEUTICS, INC.Board member Aug 18, 2017 to Aug 8, 2018⁸
• MUSTANG BIO, INC.Chair Jun 30, 2017 to Jul 20, 2017⁹
• Checkpoint Therapeutics, Inc.Chair Oct 4, 2016 to Oct 4, 2016¹⁰
• TG TherapeuticsOfficer Jan 9, 2012 to Sep 1, 2016⁵
• TG TherapeuticsChair Jan 2, 2013 to Jan 2, 2013⁴
• XTL BioBoard member Aug 26, 2008 to Nov 4, 2008¹¹

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

• TG Therapeutics TGTX9,778,086 shares¹²$547.6M at $56.00Jan 8, 2026
• Fortress Biotech FBIO2,276,562 shares¹³$4.3M at $1.87Mar 18, 2026
• MBMUSTANG BIO, INC. MBIO49,637 shares¹⁴$19.2K at $0.39Jul 5, 2023
• CTCheckpoint Therapeutics, Inc.187,007 shares¹⁵May 30, 2025

As of each latest filing. The line shows shares held over time.

Recent filings

• Mar 18, 2026Granted 475,424 shares of Fortress Biotech¹³
• Jan 8, 2026Granted 622,000 shares of TG Therapeutics¹²
• Nov 5, 2025Gift 803,717 shares of TG Therapeutics¹⁶
• Nov 5, 2025Gift 3,865,126 shares of TG Therapeutics¹⁶
• May 30, 2025U 187,007 shares of Checkpoint Therapeutics, Inc.¹⁵
• May 29, 2025Granted 50,000 shares at $1.29 of Checkpoint Therapeutics, Inc.¹⁵
• May 28, 2025Granted 12,195 shares of Checkpoint Therapeutics, Inc.¹⁵
• Jan 29, 2025Granted 750,000 shares of TG Therapeutics¹⁷
• Jan 1, 2025Granted 454,153 shares of Fortress Biotech¹⁸
• Dec 13, 2024Granted 12,638 shares of Checkpoint Therapeutics, Inc.¹⁹
• May 14, 2024Granted 50,000 shares of Checkpoint Therapeutics, Inc.²⁰
• May 14, 2024Granted 32,051 shares of Checkpoint Therapeutics, Inc.²⁰
• Jan 6, 2024Granted 1,001,908 shares of TG Therapeutics²¹
• Jan 1, 2024Granted 216,465 shares of Fortress Biotech²²
• Nov 14, 2023Bought 147,058 shares at $1.70 of Fortress Biotech²³
• Aug 11, 2023Bought 100,000 shares at $10.13 of TG Therapeutics²⁴
• Jul 5, 2023Granted 7,246 shares of MUSTANG BIO, INC.¹⁴
• Jun 13, 2023Granted 17,483 shares of Checkpoint Therapeutics, Inc.²⁵
• Mar 12, 2023Granted 985,000 shares of TG Therapeutics²⁶
• Feb 10, 2023Bought 1,197,604 shares at $0.84 of Fortress Biotech²⁷
• Jan 1, 2023Granted 1,219,294 shares of Fortress Biotech²⁸
• Jul 29, 2022Granted 71,664 shares of MUSTANG BIO, INC.²⁹
• Jun 16, 2022Granted 47,619 shares of Checkpoint Therapeutics, Inc.³⁰
• Jan 5, 2022Sold 30,671 shares at $18.31 of TG Therapeutics³¹
• Jan 4, 2022Sold 37,549 shares at $19.20 of TG Therapeutics³¹