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: 21
Latest filed: Nov 10, 2026
| Form | Count |
|---|---|
| 4 | 9 |
| 8-K | 5 |
| 144 | 3 |
| SCHEDULE 13D/A | 2 |
| SCHEDULE 13G/A | 1 |
| SCHEDULE 13G | 1 |
Latest files
| Filed | Form | Report period | Accession | SEC |
|---|---|---|---|---|
| Nov 10, 2026 | 8-K | Nov 10, 2026 | 0001104659-26-125171 | View |
| Sep 04, 2026 | 4 | Sep 04, 2026 | 0000905148-26-004085 | View |
| Aug 26, 2026 | 144 | — | 0000905148-26-003961 | View |
| Aug 26, 2026 | 4 | Aug 17, 2026 | 0000905148-26-003960 | View |
| Aug 14, 2026 | SCHEDULE 13G/A | — | 0000919574-26-005481 | View |
| Aug 12, 2026 | 8-K | Aug 12, 2026 | 0001193125-26-346857 | View |
| Jul 24, 2026 | 4 | Jul 22, 2026 | 0001104659-26-086733 | View |
| Jul 24, 2026 | SCHEDULE 13D/A | — | 0001104659-26-086728 | View |
| Jun 26, 2026 | 8-K | Jun 22, 2026 | 0001193125-26-285498 | View |
| Jun 15, 2026 | 4 | Jun 11, 2026 | 0000905148-26-002951 | View |
| Jun 12, 2026 | 8-K | Jun 09, 2026 | 0001213900-26-068264 | View |
| Jun 11, 2026 | 4 | Jun 09, 2026 | 0000905148-26-002919 | View |
| Jun 11, 2026 | 4 | Jun 09, 2026 | 0000905148-26-002920 | View |
| Jun 11, 2026 | 4 | Jun 09, 2026 | 0000905148-26-002921 | View |
| May 20, 2026 | 4 | May 18, 2026 | 0000905148-26-002570 | View |
| May 20, 2026 | 4 | May 18, 2026 | 0000905148-26-002571 | View |
| May 18, 2026 | 144 | — | 0000905148-26-002506 | View |
| May 18, 2026 | 144 | — | 0000905148-26-002507 | View |
| May 14, 2026 | SCHEDULE 13D/A | — | 0001104659-26-061506 | View |
| May 13, 2026 | SCHEDULE 13G | — | 0000919574-26-002914 | View |
| May 12, 2026 | 8-K | May 12, 2026 | 0001193125-26-219420 | View |