ATRA
Atara Biotherapeutics, Inc.
NASDAQ · Healthcare · Biotechnology · US
$9.76
+2.41%0
Insider buys (3m)
1
Insider sells (3m)
-$40.9K
Net value (3m)
-1.3%
Price return (3m)
Form 4 filings
| Date | Insider | Activity | Shares | Price |
|---|---|---|---|---|
| Aug 26, 2026 | Nguyen AnhCo · director, officer: President and CEO | Sale | 5,062 | $8.08 |
| Jul 24, 2026 | Redmile Group, LLC · director | M-Exempt | 55,387 | $0.00 |
| Jul 24, 2026 | Redmile Group, LLC · director | F-InKind | 60 | $0.00 |
| Jul 24, 2026 | Redmile Group, LLC · director | M-Exempt | 195,211 | $0.00 |
| Jun 15, 2026 | Cherry Brian N · director | A-Award | 24,000 | $0.00 |
| Jun 11, 2026 | Fust Matthew K · director | A-Award | 12,000 | $0.00 |
| Jun 11, 2026 | Ciongoli Gregory Austin · director, 10 percent owner, other: See Remarks | A-Award | 12,000 | $0.00 |
| Jun 11, 2026 | HEIDEN WILLIAM K · director | A-Award | 12,000 | $0.00 |
| May 20, 2026 | Nguyen AnhCo · director, officer: President and CEO | Sale | 5,241 | $9.13 |
| May 20, 2026 | Grant-Huerta Yanina · officer: Chief Accounting Officer | Sale | 2,414 | $9.13 |
| May 11, 2026 | EcoR1 Capital, LLC · 10 percent owner | Purchase | 507,407 | $9.35 |
| May 11, 2026 | Panacea Innovation Ltd · 10 percent owner | Sale | 313,446 | $10 |
| Mar 19, 2026 | Panacea Innovation Ltd · 10 percent owner | M-Exempt | 259,163 | $0.00 |
| Mar 19, 2026 | Panacea Innovation Ltd · 10 percent owner | F-InKind | 5 | $5.23 |
| Mar 11, 2026 | Grant-Huerta Yanina · officer: Chief Accounting Officer | A-Award | 20,300 | $0.00 |
| Mar 11, 2026 | Nguyen AnhCo · director, officer: President and CEO | A-Award | 81,100 | $0.00 |
| Mar 4, 2026 | Grant-Huerta Yanina · officer: Chief Accounting Officer | Sale | 1,603 | $5.08 |
| Mar 4, 2026 | Nguyen AnhCo · director, officer: President and CEO | Sale | 1,442 | $5.09 |
| Mar 4, 2026 | Grant-Huerta Yanina · officer: Chief Accounting Officer | Sale | 100 | $5.08 |
| Mar 4, 2026 | Nguyen AnhCo · director, officer: President and CEO | Sale | 198 | $5.08 |
| Mar 4, 2026 | Grant-Huerta Yanina · officer: Chief Accounting Officer | Sale | 24 | $5.08 |
| Mar 4, 2026 | Nguyen AnhCo · director, officer: President and CEO | Sale | 58 | $5.08 |
| Mar 4, 2026 | Nguyen AnhCo · director, officer: President and CEO | Sale | 1,298 | $5.09 |
| Mar 4, 2026 | Grant-Huerta Yanina · officer: Chief Accounting Officer | Sale | 377 | $5.08 |
| Jan 14, 2026 | Panacea Innovation Ltd · 10 percent owner | Sale | 80,554 | $6.07 |
| Dec 1, 2025 | Panacea Innovation Ltd · 10 percent owner | F-InKind | 1 | $14 |
| Dec 1, 2025 | Panacea Innovation Ltd · 10 percent owner | M-Exempt | 48,737 | $0.00 |
| Nov 19, 2025 | Grant-Huerta Yanina · officer: Chief Accounting Officer | Sale | 85 | $13 |
| Nov 19, 2025 | Grant-Huerta Yanina · officer: Chief Accounting Officer | Sale | 1,645 | $13 |
| Nov 19, 2025 | Nguyen AnhCo · director, officer: President and CEO | Sale | 2,859 | $13 |
Institutional positioning
13F filings over the trailing two quarters
New 11Increased 22Reduced 13Sold out 1
| Filer | Action | Shares | Filed |
|---|---|---|---|
| EcoR1 Capital, LLC | Increased | 1,552,000 | Aug 14, 2026 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | Increased | 850,000 | Aug 14, 2026 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | New Position | 700,000 | May 15, 2026 |
| Point72 Asset Management, L.P. | Increased | 687,718 | Aug 14, 2026 |
| REDMILE GROUP, LLC | Unchanged | 441,701 | May 15, 2026 |
| Redmile Group, LLC | Unchanged | 441,701 | Aug 14, 2026 |
| MACKENZIE FINANCIAL CORP | Increased | 313,620 | May 13, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 247,047 | Aug 13, 2026 |
| MACKENZIE FINANCIAL CORP | Reduced | 233,249 | Aug 13, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 217,862 | May 15, 2026 |
| POINT72 ASSET MANAGEMENT, L.P. | Increased | 194,264 | May 15, 2026 |
| ACADIAN ASSET MANAGEMENT LLC | Increased | 130,910 | May 13, 2026 |
| ECOR1 CAPITAL, LLC | Reduced | 99,593 | May 15, 2026 |
| BlackRock, Inc. | Increased | 84,455 | Aug 7, 2026 |
| BLACKROCK, INC. | Increased | 79,022 | May 13, 2026 |
Insider activity from SEC Form 4; institutional positioning from 13F filings · Latest filing Aug 26, 2026