Quick Takeaways
- Adiumentum Capital Fund I LP filed SCHEDULE 13D/A for Atara Biotherapeutics, Inc. Common Stock, par value $0.0001 per share (ATRA).
- Disclosed ownership: 20%.
- Date of event: 14 May 2025.
Adiumentum Capital Fund I LP - 14 May 2025 SCHEDULE 13D/A Report for Atara Biotherapeutics, Inc. Common Stock, par value $0.0001 per share (ATRA)
- Filing Manager
- Adiumentum Capital Fund I LP
- Reporting Manager
- Adiumentum Capital Fund I LP
- Symbol
- ATRA
- Shares outstanding
- 6,853,832 shares
- Disclosed Ownership
- 1,370,081 shares
- Ownership
- 20%
- Form type
- SCHEDULE 13D/A
- Filing time
- 16 May 2025, 18:28:02 UTC
- Date of event
- 14 May 2025
- SEC
- View on sec.gov
Quoteable Key Fact
"Adiumentum Capital Fund I LP disclosed 20% ownership in Atara Biotherapeutics, Inc. Common Stock, par value $0.0001 per share (ATRA) on 14 May 2025."
What Changed
- No earlier schedule filing is available for direct comparison.
- Current filing was accepted on 16 May 2025, 18:28.
Why This Matters
- This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
- You can verify ownership claims directly against the original SEC filing.
Source Evidence
Backed by Schedule 13D/13G
See Original Filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting Managers (3)
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Adiumentum Capital Fund I LP | 20% | 1,370,081 | 0 | 1,370,081 | /s/ Gregory A. Ciongoli | By: Adiumentum Capital Fund I GP, LLC, its general partner Name: Gregory A. Ciongoli, Title: Managing Member | 0002023734 |
| Adiumentum Capital Fund I GP LLC | 20% | 1,370,081 | 0 | 1,370,081 | /s/ Gregory A. Ciongoli | Name: Gregory A. Ciongoli, Title: Managing Member | 0002023736 |
| Gregory A. Ciongoli | 20% | 1,370,081 | 0 | 1,370,081 | /s/ Gregory A. Ciongoli | Name: Gregory A. Ciongoli | 0002023732 |