Quick Takeaways
- Michael S. Weiss has 4 issuer positions tracked on this page.
- Estimated disclosed ownership value: $299,765,113.
- Recent insider filing activity is available below.
- Info
- Insider Ownership
Insider Trading & Ownership of Michael S. Weiss
- Location
- New York, NY
- Summary
- The estimated net worth of Michael S. Weiss is at least $299,765,113 dollars as of 20 Mar 2026. Michael S. Weiss is the CEO, Director of TG THERAPEUTICS, INC. and owns shares of TG THERAPEUTICS, INC. (TGTX) stock worth about $291.48M. Michael S. Weiss is the Executive Vice Chairman, Director of Fortress Biotech, Inc. and owns shares of Fortress Biotech, Inc. (FBIO) stock worth about $8.01M. Michael S. Weiss is the Director of Checkpoint Therapeutics, Inc. and owns shares of Checkpoint Therapeutics, Inc. stock worth about $241.2K. Michael S. Weiss is the Director of MUSTANG BIO, INC. and owns shares of MUSTANG BIO, INC. (MBIO) stock worth about $25.6K.
- Signature
- /s/ Samuel Berry, Attorney-in-Fact
- All Insider Reports
- All Insider Reports
Follow Filing Activity
Follow Michael S. Weiss and return when a new Insider Trading filing appears.
This tracks SEC filing changes for this page using existing product update flows.
What Changed
- Largest disclosed position: TG THERAPEUTICS, INC. ($291,484,743).
- Past-year value change for that position: .
Why This Matters
- This page translates Forms 3/4/5 into a quick ownership context before you inspect each transaction row.
- You can cross-check role, issuer, and filing chronology directly against the SEC source.
Official SEC Source
Filed on Form 4
Insider ownership context is sourced from SEC Forms 3, 4, and 5.
See Original FilingOwnership of Michael S. Weiss
| Symbol | Company | Relationship | Holdings Value | Past Year Net Change | Change % | Report Period |
|---|---|---|---|---|---|---|
| TGTX | TG THERAPEUTICS, INC. | CEO, Director | $291,484,743 | 08 Jan 2026 | ||
| FBIO, FBIOP | Fortress Biotech, Inc. | Executive Vice Chairman, Director | $8,013,498 | 18 Mar 2026 | ||
| CKPT | Checkpoint Therapeutics, Inc. | Director | $241,239 | 28 May 2025 | ||
| MBIO | MUSTANG BIO, INC. | Director | $25,633 | 05 Jul 2023 |
Insider Transactions Reported by Michael S. Weiss:
| Sym | Company | Class | Transaction | % | Value $ | * Price $ | Shares | Shares After | Date | Ownership |
|---|
* An asterisk sign (*) next to the price indicates that the price is likely invalid.