James B.  Tananbaum net worth and biography

James Tananbaum Biography and Net Worth

Director of Alumis

James B. Tananbaum, M.D. has served as a member of our Board since May 2021. Dr. Tananbaum is currently the President, Chief Executive Officer and a director of Foresite Capital Management, a U.S.- focused healthcare investment firm, which he founded in 2010. From 2000 to 2010, Dr. Tananbaum served as Co-Founder and Managing Director of Prospect Venture Partners L.P. II and III, healthcare venture partnerships. Dr. Tananbaum was also the Founder of GelTex, Inc. in 1991, an intestinal medicine pharmaceutical company acquired by Sanofi-Genzyme, and Theravance, Inc. in 1997 (now Theravance Biopharma, Inc., a diversified biopharmaceutical company focused on organ-selective medicines, and Innoviva, Inc., a respiratory-focused healthcare asset management company partnered with Glaxo Group Limited). Dr. Tananbaum presently serves on the board of directors of Fabric Genomics, Inc., among other companies. During the past five years, Dr. Tananbaum served on the boards of directors of Quantum-SI Incorporate, Gemini Therapeutics, Inc., 10X Genomics, Inc., and Kinnate Biopharma Inc., among other companies. Dr. Tananbaum received an M.D. and an M.B.A. from Harvard University, and a B.S. and a B.S.E.E. from Yale University in Applied Math and Computer Science. 

What is James B. Tananbaum's net worth?

The estimated net worth of James B. Tananbaum is at least $149.86 million as of January 8th, 2026. Tananbaum owns 5,702,536 shares of Alumis stock worth more than $149,862,646 as of January 22nd. This net worth estimate does not reflect any other investments that Tananbaum may own. Learn More about James B. Tananbaum's net worth.

How do I contact James B. Tananbaum?

The corporate mailing address for Tananbaum and other Alumis executives is 280 EAST GRAND AVENUE, SOUTH SAN FRANCISCO, CA, 94080. Alumis can also be reached via phone at (650) 231-6625 and via email at [email protected]. Learn More on James B. Tananbaum's contact information.

Has James B. Tananbaum been buying or selling shares of Alumis?

In the last ninety days, James B. Tananbaum has bought $6,999,988.00 in Alumis stock. Most recently, on Thursday, January 8th, James B. Tananbaum bought 411,764 shares of Alumis stock. The stock was acquired at an average cost of $17.00 per share, with a total value of $6,999,988.00. Following the completion of the transaction, the director now directly owns 5,702,536 shares of the company's stock, valued at $96,943,112. Learn More on James B. Tananbaum's trading history.

Who are Alumis' active insiders?

Alumis' insider roster includes Alan Colowick (Director), and James Tananbaum (Director). Learn More on Alumis' active insiders.

Are insiders buying or selling shares of Alumis?

During the last twelve months, Alumis insiders bought shares 31 times. They purchased a total of 5,009,446 shares worth more than $51,244,210.87. The most recent insider tranaction occured on January, 9th when Director Srinivas Akkaraju bought 588,235 shares worth more than $9,999,995.00. Insiders at Alumis own 40.7% of the company. Learn More about insider trades at Alumis.

Information on this page was last updated on 1/9/2026.

James B. Tananbaum Insider Trading History at Alumis

Transaction DateBuy/SellNumber of SharesAverage Share PriceTotal TransactionShares Held After TransactionDetails
1/8/2026Buy411,764$17.00$6,999,988.005,702,536View SEC Filing Icon  
11/19/2025Buy190,500$6.56$1,249,680.002,542,003View SEC Filing Icon  
11/18/2025Buy117,374$6.19$726,545.062,351,503View SEC Filing Icon  
11/17/2025Buy200,000$5.59$1,118,000.002,234,129View SEC Filing Icon  
See Full Table

James B. Tananbaum Buying and Selling Activity at Alumis

This chart shows James B Tananbaum's buying and selling at Alumis by year and by quarter.

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Alumis Company Overview

Alumis logo
Our mission is to significantly improve the lives of patients by replacing broad immunosuppression with targeted therapies. Our name, Alumis, captures our mission to enlighten immunology, and is inspired by the words "allumer"-French for illuminate-and "immunis"-Latin for the immune system. We are a clinical stage biopharmaceutical company with an initial focus on developing our two Tyrosine Kinase 2 (TYK2) inhibitors: ESK-001, a second-generation inhibitor that we are developing to maximize target inhibition and optimize tolerability, and A-005, a central nervous system (CNS) penetrant molecule. ESK-001 has demonstrated significant therapeutic effect in our Phase 2 program in patients with PsO, which we define as moderate-to-severe plaque psoriasis (PsO), and is currently being evaluated in an additional Phase 2 clinical trial in patients with systemic lupus erythematosus (SLE), for which we expect to report results in 2026. With the favorable results in our Phase 2 clinical trial in PsO, we intend to initiate multiple Phase 3 clinical trials of ESK-001 in the second half of 2024 in this indication. TYK2 genetic mutations are associated with a strong protective effect in multiple sclerosis, motivating us to develop our second product candidate, A-005, as a CNS-penetrant, allosteric TYK2 inhibitor for neuroinflammatory and neurodegenerative diseases. In April 2024, we initiated our Phase 1 program of A-005 in healthy volunteers and expect to report initial results by the end of 2024. We utilize our proprietary precision data analytics platform, biological insights and team of experienced research and development experts to deepen our understanding of disease pathologies, accelerate research and development and increase the probability of clinical success. Our collective insights informed our selection of TYK2 as the target for our two lead programs. Beyond TYK2, our proprietary precision data analytics platform and drug discovery expertise have led to the identification of additional preclinical programs that exemplify our precision approach. We recognize that patients living with immune-mediated diseases need alternatives to currently available therapies. Despite recent advances and innovations in the treatment of immune-mediated diseases, many patients continue to suffer, cycling through currently approved therapies while looking for a solution that alleviates the debilitating impact of their disease without life-limiting side effects. Addressing the needs of these patients is why we exist. We are pioneering a precision approach that leverages insights derived from powerful data analytics to select the right target, right molecule, right indication, right patient, right endpoint and right combination to dramatically improve patient outcomes. We believe that combining our insights with an integrated approach to drug development will produce the next generation of treatments to address immune dysfunction. We were founded in January 2021 as a Delaware corporation under the name FL2021-001, Inc. We changed our name to Esker Therapeutics, Inc. in March 2021, and subsequently to Alumis Inc. in January 2022. Our principal executive offices are located at 280 East Grand Avenue, South San Francisco, California.
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Today's Range

Now: $26.28
Low: $25.77
High: $27.00

50 Day Range

MA: $12.28
Low: $5.28
High: $26.68

2 Week Range

Now: $26.28
Low: $2.76
High: $27.20

Volume

1,742,180 shs

Average Volume

8,337,376 shs

Market Capitalization

$2.74 billion

P/E Ratio

N/A

Dividend Yield

N/A

Beta

N/A