Quick Takeaways
- James B. Tananbaum has 5 issuer positions tracked on this page.
- Estimated disclosed ownership value: $49,392,059.
- Recent insider filing activity is available below.
- Info
- Significant Ownership
- Insider Ownership
Insider Trading & Ownership of James B. Tananbaum
- Location
- San Francisco, CA
- Summary
- The estimated net worth of James B. Tananbaum is at least $49,392,059 dollars as of 03 Apr 2026. James B. Tananbaum is the Director, 10%+ Owner of Gemini Therapeutics, Inc. /DE and owns shares of Disc Medicine, Inc. (IRON) stock worth about $27.84M. James B. Tananbaum is the Director of Quantum-Si Inc and owns shares of Quantum-Si Inc (QSI) stock worth about $14.91M. James B. Tananbaum is the Director, 10%+ Owner of ALUMIS INC. and owns shares of ALUMIS INC. (ALMS) stock worth about $6.64M. James B. Tananbaum is the President and CEO, Director, 10%+ Owner of PARDES BIOSCIENCES, INC. and owns shares of PARDES BIOSCIENCES, INC. stock worth about $1.5K.
- Signature
- /s/ James B. Tananbaum
- All Insider Reports
- All Insider Reports
Follow Filing Activity
Follow James B. Tananbaum 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: Gemini Therapeutics, Inc. /DE ($27,837,975).
- 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 James B. Tananbaum
| Symbol | Company | Relationship | Holdings Value | Past Year Net Change | Change % | Report Period |
|---|---|---|---|---|---|---|
| IRON | Gemini Therapeutics, Inc. /DE | Director, 10%+ Owner | $27,837,975 | 04 Oct 2021 | ||
| QSI, QSIAW | Quantum-Si Inc | Director | $14,911,041 | 10 Jun 2021 | ||
| ALMS | ALUMIS INC. | Director, 10%+ Owner | $6,641,543 | +$10,829,938 | +163% | 01 Apr 2026 |
| PRDS | PARDES BIOSCIENCES, INC. | President and CEO, Director, 10%+ Owner | $1,500 | 31 Aug 2023 | ||
| KNTE | Kinnate Biopharma Inc. | Director, 10%+ Owner | $0 | 03 Apr 2024 |
Insider Transactions Reported by James B. Tananbaum:
| 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.