Institutional Ownership
Atara Biotherapeutics Inc
CUSIP 046513107COMATRAQ1 2026
13D / 13G Filings
53
Schedule 13D/13G on record
Beneficial Filers
19
Distinct reporting persons
Largest Stake
20.0%
Max % of class reported
Institutional Holders
1
13F filers (latest quarter)
Beneficial Owners — Schedule 13D / 13G
53 filings · latest Jan 14, 2026
| # | Filed | Reporting Person | Form | % of Class | Shares | Filing |
|---|---|---|---|---|---|---|
| 1 | Jan 14, 2026 | Panacea Innovation Limited | 13D/A | 20.0% | — | SEC |
| 2 | Aug 19, 2025 | Panacea Innovation Limited | 13D/A | 20.0% | — | SEC |
| 3 | May 21, 2025 | Panacea Innovation Limited | 13D | 20.0% | — | SEC |
| 4 | May 16, 2025 | Adiumentum Capital Fund I LP | 13D/A | 20.0% | — | SEC |
| 5 | Sep 13, 2024 | Redmile Group, LLC | 13G/A | 9.9% | 579.5K | SEC |
| 6 | Sep 5, 2024 | Adiumentum Capital Fund I LP | 13D/A | 20.0% | 1.13M | SEC |
| 7 | Jul 8, 2024 | Blackrock Inc. | 13G/A | — | — | SEC |
| 8 | May 22, 2024 | Adiumentum Capital Fund I LP | 13D | 6.7% | 8.07M | SEC |
| 9 | Mar 18, 2024 | Citadel Advisors LLC | 13G | 6.4% | — | SEC |
| 10 | Feb 14, 2024 | Maverick Capital Ltd | 13G/A | — | — | SEC |
43 more beneficial-ownership filings on Premium
See the full Schedule 13D/13G history for Atara Biotherapeutics Inc.
Unlock full historyTop Institutional Holders (13F)
Largest reported positions · latest quarter
| # | Fund | Shares | Value |
|---|---|---|---|
| 1 | Planvest Financial, Inc | 28 | $132 |