![Gregory Ciongoli](data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="%231b1b1b" class="bi bi-person-fill" viewBox="0 0 16 16"><path d="M3 14s-1 0-1-1 1-4 6-4 6 3 6 4-1 1-1 1zm5-6a3 3 0 1 0 0-6 3 3 0 0 0 0 6"/></svg>)
Gregory Ciongoli
Chairman at
ATARA BIOTHERAPEUTICS, INC.
Net worth: 13 M $ as of 2026-06-29
Profile
Gregory A. Ciongoli is the founder of Adiumentum Capital Management LLC.
Mr. Ciongoli is currently Chairman at Atara Biotherapeutics, Inc. starting in 2025 and Director at Zymeworks, Inc. starting in 2025.
Mr. Ciongoli was a Partner at The Baupost Group LLC.
Mr. Ciongoli earned an MBA from Harvard Business School and completed undergraduate studies at the Woodrow Wilson School of Public & International Affairs.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
ZYMEWORKS INC. 0.68% | 2026-01-11 | 493,500 ( 0.68% ) | 13 M $ | 2026-06-29 |
| 2026-06-08 | 12,000 ( 0.13% ) | 137 760 $ | 2026-06-29 |
Gregory Ciongoli active positions
| Companies | Position | Start |
|---|---|---|
| ATARA BIOTHERAPEUTICS, INC. | Chairman | 2025-09-02 |
| ZYMEWORKS INC. | Director/Board Member | 2025-08-10 |
Former positions of Gregory Ciongoli
| Companies | Position | End |
|---|---|---|
The Baupost Group LLC
 The Baupost Group LLC Investment ManagersFinance Baupost is an opportunistic, value-oriented, open mandate investor that seeks to invest their capital to achieve attractive risk-adjusted returns over an extended period of time. The firm seeks to invest in assets which are undervalued relative to their market price. | Corporate Officer/Principal | - |
Training of Gregory Ciongoli
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
4
1st degree connections
5
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 5 |
|---|---|
The Baupost Group LLC
The Baupost Group LLC Investment ManagersFinance Baupost is an opportunistic, value-oriented, open mandate investor that seeks to invest their capital to achieve attractive risk-adjusted returns over an extended period of time. The firm seeks to invest in assets which are undervalued relative to their market price. | Finance |
Harvard Business School
 Harvard Business School Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Atara Biotherapeutics, Inc.
 Atara Biotherapeutics, Inc. Pharmaceuticals: MajorHealth Technology Pioneers the development of transformative therapies for patients with serious diseases including solid tumors, hematologic cancers, and autoimmune diseases | Health Technology |
Woodrow Wilson School of Public & International Affairs
 Woodrow Wilson School of Public & International Affairs Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Zymeworks, Inc.
 Zymeworks, Inc. Pharmaceuticals: MajorHealth Technology Develops pharmaceuticals | Health Technology |
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