Atara Biotherapeutics, Inc. - ATRA
All tracked SEC files for this issuer. Showing up to 200 latest records.
Need parsed ownership details (13D/13G with shares/percent)?
Open ownership details
Form 4 = insider transactions report. Form 144 = notice of proposed sale (not a completed trade confirmation).
Files summary
Total files loaded: 25
Latest filed: May 01, 2026
| Form | Count |
|---|---|
| 4 | 9 |
| 8-K | 8 |
| 144 | 5 |
| SCHEDULE 13D/A | 2 |
| SCHEDULE 13G/A | 1 |
Latest files
| Filed | Form | Report period | Accession | SEC |
|---|---|---|---|---|
| May 01, 2026 | 8-K | Apr 30, 2026 | 0001193125-26-201397 | View |
| Mar 19, 2026 | 4 | Mar 17, 2026 | 0001193125-26-116060 | View |
| Mar 16, 2026 | 8-K | Mar 16, 2026 | 0001193125-26-108344 | View |
| Mar 12, 2026 | 8-K | Mar 12, 2026 | 0001193125-26-103127 | View |
| Mar 11, 2026 | 4 | Mar 09, 2026 | 0000905148-26-001224 | View |
| Mar 11, 2026 | 4 | Mar 09, 2026 | 0000905148-26-001225 | View |
| Mar 04, 2026 | 4 | Mar 02, 2026 | 0000905148-26-001143 | View |
| Mar 04, 2026 | 4 | Mar 02, 2026 | 0000905148-26-001144 | View |
| Mar 03, 2026 | 8-K | Mar 03, 2026 | 0001193125-26-086793 | View |
| Mar 02, 2026 | 144 | — | 0000905148-26-001100 | View |
| Mar 02, 2026 | 144 | — | 0000905148-26-001102 | View |
| Feb 23, 2026 | 8-K | Feb 20, 2026 | 0001193125-26-062534 | View |
| Jan 14, 2026 | SCHEDULE 13D/A | — | 0001193125-26-013362 | View |
| Jan 14, 2026 | 4 | Jan 12, 2026 | 0001193125-26-013358 | View |
| Jan 12, 2026 | 8-K | Jan 12, 2026 | 0001193125-26-010342 | View |
| Jan 12, 2026 | 144 | — | 0001193125-26-010883 | View |
| Jan 02, 2026 | 8-K | Dec 30, 2025 | 0001193125-26-000907 | View |
| Dec 01, 2025 | 4 | Nov 28, 2025 | 0001193125-25-304018 | View |
| Nov 19, 2025 | 4 | Nov 17, 2025 | 0000905148-25-004140 | View |
| Nov 19, 2025 | 4 | Nov 17, 2025 | 0000905148-25-004141 | View |
| Nov 17, 2025 | 144 | — | 0000905148-25-004101 | View |
| Nov 17, 2025 | 144 | — | 0000905148-25-004102 | View |
| Nov 14, 2025 | SCHEDULE 13G/A | — | 0000935836-25-000703 | View |
| Nov 14, 2025 | SCHEDULE 13D/A | — | 0001104659-25-112574 | View |
| Nov 12, 2025 | 8-K | Nov 12, 2025 | 0001193125-25-276209 | View |