Real time insider trading transaction history:
- Insiders are prohibited from making short-swing profits by trading their shares within 6 months of the registration or acquiring the shares.
- Shares are not adjusted for stock split.
"Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise"
- Peter Lynch
What is insider trading>>
- Peter Lynch
What is insider trading>>
Common stock purchase or sale:
| Transaction Date | Reported DateTime | Company | Symbol | Insider Relationship | Shares Traded | Average Price | Total Amount | Shares Owned | Filing |
| 2026-05-18 Sale | 2026-05-20 5:24 pm | Atara Biotherapeutics Inc. | ATRA | Nguyen AnhCo President and CEO | 5,241 | $9.1289 | $47,845 | 137,837 (Direct) | View |
| 2026-05-18 Sale | 2026-05-20 5:24 pm | Atara Biotherapeutics Inc. | ATRA | Grant-Huerta Yanina Chief Accounting Officer | 2,414 | $9.1286 | $22,036 | 49,636 (Direct) | View |
| 2026-05-07 Sale | 2026-05-11 6:45 pm | Atara Biotherapeutics Inc. | ATRA | Panacea Innovation Ltd Huang James 10% Owner | 313,446 | $10.1 | $3,165,021 | 1,318,894 (Indirect) | View |
| 2026-05-07 Purchase | 2026-05-11 5:34 pm | Atara Biotherapeutics Inc. | ATRA | EcoR1 Capital LLC 10% Owner | 507,407 | $9.35 | $4,744,255 | 1,552,000 (Indirect) | View |
| 2026-03-02 Sale | 2026-03-04 4:28 pm | Atara Biotherapeutics Inc. | ATRA | Grant-Huerta Yanina Chief Accounting Officer | 2,104 | $5.0812 | $10,691 | 31,750 (Direct) | View |
| 2026-03-02 Sale | 2026-03-04 4:28 pm | Atara Biotherapeutics Inc. | ATRA | Nguyen AnhCo President and CEO | 2,996 | $5.0859 | $15,237 | 61,978 (Direct) | View |
| 2026-01-12 Sale | 2026-01-14 9:16 pm | Atara Biotherapeutics Inc. | ATRA | Panacea Innovation Ltd Huang James 10% Owner | 80,554 | $6.0707 | $489,019 | 1,373,182 (Indirect) | View |
| 2025-11-17 Sale | 2025-11-19 4:55 pm | Atara Biotherapeutics Inc. | ATRA | Nguyen AnhCo President and CEO | 2,915 | $13.19 | $38,437 | 64,974 (Direct) | View |
| 2025-11-17 Sale | 2025-11-19 4:55 pm | Atara Biotherapeutics Inc. | ATRA | Grant-Huerta Yanina Chief Accounting Officer | 1,804 | $13.19 | $23,788 | 33,454 (Direct) | View |
| 2025-08-18 Sale | 2025-08-20 4:11 pm | Atara Biotherapeutics Inc. | ATRA | Nguyen AnhCo President and CEO | 2,958 | $11.62 | $34,360 | 67,889 (Direct) | View |
| 2025-08-18 Sale | 2025-08-20 4:08 pm | Atara Biotherapeutics Inc. | ATRA | Grant-Huerta Yanina Chief Accounting Officer | 1,809 | $11.61 | $21,009 | 35,258 (Direct) | View |
| 2025-08-15 Purchase | 2025-08-19 8:15 pm | Atara Biotherapeutics Inc. | ATRA | Panacea Innovation Ltd Huang James 10% Owner | 55,000 | $12.19 | $670,423 | 1,405,000 (Indirect) | View |
| 2025-07-17 Purchase | 2025-07-21 09:00 am | Atara Biotherapeutics Inc. | ATRA | Panacea Innovation Ltd Huang James 10% Owner | 19,335 | $9.6391 | $186,372 | 1,350,000 (Indirect) | View |
| 2025-05-16 Sale | 2025-05-20 4:59 pm | Atara Biotherapeutics Inc. | ATRA | Grant-Huerta Yanina Chief Accounting Officer | 2,218 | $6.763 | $15,000 | 37,067 (Direct) | View |
| 2025-05-16 Sale | 2025-05-20 4:58 pm | Atara Biotherapeutics Inc. | ATRA | Nguyen AnhCo President and CEO | 3,276 | $6.763 | $22,156 | 70,847 (Direct) | View |
| 2025-03-03 Sale | 2025-03-05 5:17 pm | Atara Biotherapeutics Inc. | ATRA | Nguyen AnhCo President and CEO | 3,331 | $6.997 | $23,307 | 74,123 (Direct) | View |
| 2025-03-03 Sale | 2025-03-05 5:17 pm | Atara Biotherapeutics Inc. | ATRA | Hyllengren Eric J EVP, CFO and COO | 1,211 | $6.997 | $8,473 | 56,231 (Direct) | View |
| 2025-03-03 Sale | 2025-03-05 5:16 pm | Atara Biotherapeutics Inc. | ATRA | Henrich Jill EVP, Chief Regulatory Officer | 1,059 | $6.997 | $7,410 | 18,679 (Direct) | View |
Stock options: Exercise, Award, Grant, Conversion
| Transaction Date | Reported DateTime | Exercisable Expiration | Company | Symnbol | Insider Relationship | Shares Traded | Conversion Price | Shares Owned | Filing |
| 2026-06-11 Option Award | 2026-06-15 6:51 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | Cherry Brian N Director | 24,000 | $0 | 62,320 (Direct) | View |
Ownership | 2026-06-15 6:48 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | Cherry Brian N Director | 0 | $0 | 38,320 (Direct) | View |
| 2026-06-09 Option Award | 2026-06-11 4:37 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | HEIDEN WILLIAM K Director | 12,000 | $0 | 34,188 (Direct) | View |
| 2026-06-09 Option Award | 2026-06-11 4:36 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | Fust Matthew K Director | 12,000 | $0 | 30,188 (Direct) | View |
| 2026-06-09 Option Award | 2026-06-11 4:36 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | Ciongoli Gregory Austin See Remarks 10% Owner | 12,000 | $0 | 1,221,395 (Direct) | View |
Ownership | 2026-05-11 5:33 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | EcoR1 Capital LLC 10% Owner | 0 | $0 | 1,044,593 (Indirect) | View |
| 2026-03-17 Tax Withholding | 2026-03-19 4:30 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | Panacea Innovation Ltd Huang James 10% Owner | 5 | $5.23 | 1,632,340 (Indirect) | View |
| 2026-03-17 Exercise | 2026-03-19 4:30 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | Panacea Innovation Ltd Huang James 10% Owner | 259,163 | $6.6099 | 1,632,340 (Indirect) | View |
| 2026-03-17 Exercise | 2026-03-19 4:30 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | Panacea Innovation Ltd Huang James 10% Owner | 259,163 | $0.0001 | 1,632,340 (Indirect) | View |
| 2026-03-09 Option Award | 2026-03-11 5:46 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | Nguyen AnhCo President and CEO | 81,100 | $0 | 143,078 (Direct) | View |
| 2026-03-09 Option Award | 2026-03-11 5:45 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | Grant-Huerta Yanina Chief Accounting Officer | 20,300 | $0 | 52,050 (Direct) | View |
| 2025-11-28 Tax Withholding | 2025-12-01 5:00 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | Panacea Innovation Ltd Huang James 10% Owner | 1 | $14.03 | 1,712,899 (Indirect) | View |
| 2025-11-28 Exercise | 2025-12-01 5:00 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | Panacea Innovation Ltd Huang James 10% Owner | 48,737 | $6.6099 | 1,712,899 (Indirect) | View |
| 2025-11-28 Exercise | 2025-12-01 5:00 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | Panacea Innovation Ltd Huang James 10% Owner | 48,737 | $0.0001 | 1,712,899 (Indirect) | View |
| 2025-06-10 Option Award | 2025-06-12 8:39 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | Gallagher Carol Giltner Director | 7,828 | $0 | 33,012 (Direct) | View |
| 2025-06-10 Option Award | 2025-06-12 8:39 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | Fust Matthew K Director | 7,828 | $0 | 18,188 (Direct) | View |
| 2025-06-10 Option Award | 2025-06-12 8:39 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | Touchon Pascal Director | 7,828 | $0 | 77,955 (Direct) | View |
| 2025-06-10 Option Award | 2025-06-12 8:39 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | Roncarolo Maria Grazia Director | 7,828 | $0 | 17,368 (Direct) | View |
| 2025-06-10 Option Award | 2025-06-12 8:38 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | MALLIK AMEET Director | 7,828 | $0 | 16,928 (Direct) | View |
| 2025-06-10 Option Award | 2025-06-12 8:36 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | HEIDEN WILLIAM K Director | 7,828 | $0 | 22,188 (Direct) | View |
Ownership | 2025-05-23 4:01 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | Redmile Group LLC Green Jeremy Director | 0 | $0 | 3,863,519 (Indirect) | View |
Ownership | 2025-05-21 6:00 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | Panacea Innovation Ltd Huang James 10% Owner | 0 | $0 | 1,638,565 (Indirect) | View |
| 2025-05-16 Option Award | 2025-05-16 6:26 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | Adiumentum Capital Fund I LP Adiumentum Capital Fund I GP LLC Ciongoli Gregory Austin See remarks 10% Owner | 227,000 | $6.6099 | 1,586,588 (Direct) | View |
| 2025-05-16 Option Award | 2025-05-16 6:26 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | Adiumentum Capital Fund I LP Adiumentum Capital Fund I GP LLC Ciongoli Gregory Austin See remarks 10% Owner | 75,572 | $6.61 | 1,586,588 (Direct) | View |
Ownership | 2025-04-10 7:14 pm | N/A N/A | Atara Biotherapeutics Inc. | ATRA | Grant-Huerta Yanina Chief Accounting Officer | 0 | $0 | 42,010 (Direct) | View |