Nguyen AnhCo, President and CEO of Atara Biotherapeutics, Inc. ($ATRA), sold common shares on the open market 10 times over the past year, totaling about $110,000. His most recent sale occurred on March 2, 2026. These sales rank 9,424th among 11,678 individual insiders, far below the average sale value of $8.6 million and 6.4 transactions per insider. Nguyen AnhCo made no open market purchases in the last 365 days.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 9, 2026 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | President and CEO | A | Common Stock | 81100 | $0.00 | 143,078.0000 | 13,564,000 | 130.85% | 0.60% |
| March 2, 2026 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | President and CEO | S | Common Stock | 198 | $5.08 | 64,776.0000 | 13,564,000 | 0.30% | 0.00% |
| March 2, 2026 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | President and CEO | S | Common Stock | 1442 | $5.09 | 61,978.0000 | 13,564,000 | 2.27% | 0.01% |
| March 2, 2026 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | President and CEO | S | Common Stock | 1298 | $5.09 | 63,420.0000 | 13,564,000 | 2.01% | 0.01% |
| March 2, 2026 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | President and CEO | S | Common Stock | 58 | $5.08 | 64,718.0000 | 13,564,000 | 0.09% | 0.00% |
| Nov. 17, 2025 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | President and CEO | S | Common Stock | 56 | $13.19 | 64,974.0000 | 13,564,000 | 0.09% | 0.00% |
| Nov. 17, 2025 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | President and CEO | S | Common Stock | 2859 | $13.19 | 65,030.0000 | 13,564,000 | 4.21% | 0.02% |
| Aug. 18, 2025 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | President and CEO | S | Common Stock | 57 | $11.61 | 70,790.0000 | 7,488,000 | 0.08% | 0.00% |
| Aug. 18, 2025 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | President and CEO | S | Common Stock | 1281 | $11.62 | 69,509.0000 | 7,488,000 | 1.81% | 0.02% |
| Aug. 18, 2025 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | President and CEO | S | Common Stock | 1620 | $11.62 | 67,889.0000 | 7,488,000 | 2.33% | 0.02% |
| May 16, 2025 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | President and CEO | S | Common Stock | 3276 | $6.76 | 70,847.0000 | 7,488,000 | 4.42% | 0.04% |
| March 3, 2025 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | President and CEO | S | Common Stock | 3331 | $7.00 | 74,123.0000 | 7,488,000 | 4.30% | 0.04% |
| Nov. 18, 2024 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | President and CEO | S | Common Stock | 1664 | $11.20 | 77,454.0000 | 7,466,000 | 2.10% | 0.02% |
| Sept. 9, 2024 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | President and CEO | A | Common Stock | 45000 | $0.00 | 79,118.0000 | 4,236,000 | 131.90% | 1.06% |
| Aug. 16, 2024 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | EVP, Chief Sci. & Tech Officer | S | Common Stock | 56 | $6.63 | 34,118.0000 | 4,236,000 | 0.16% | 0.00% |
| Aug. 16, 2024 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | EVP, Chief Sci. & Tech Officer | S | Common Stock | 1468 | $6.63 | 34,471.0000 | 4,236,000 | 4.08% | 0.03% |
| Aug. 16, 2024 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | EVP, Chief Sci. & Tech Officer | S | Common Stock | 297 | $6.63 | 34,174.0000 | 4,236,000 | 0.86% | 0.01% |
| May 16, 2024 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | EVP, Chief Sci. & Tech Officer | S | Common Stock | 42899 | $0.62 | 898,498.0000 | 4,236,000 | 4.56% | 1.01% |
| March 4, 2024 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | EVP, Chief Sci. & Tech Officer | S | Common Stock | 10746 | $0.72 | 941,397.0000 | 4,236,000 | 1.13% | 0.25% |
| Jan. 8, 2024 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | EVP, Chief Sci. & Tech Officer | A | Common Stock | 675000 | $0.00 | 952,143.0000 | 4,236,000 | 243.56% | 15.94% |
| Nov. 16, 2023 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | EVP, Chief Sci. & Tech Officer | S | Common Stock | 8856 | $0.39 | 277,143.0000 | 0 | 3.10% | 0.00% |
| Aug. 16, 2023 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | EVP, Chief Sci. & Tech Officer | S | Common Stock | 9277 | $1.65 | 285,999.0000 | 0 | 3.14% | 0.00% |
| Aug. 16, 2023 | Atara Biotherapeutics, Inc. | $ATRA | Nguyen AnhCo | EVP, Chief Sci. & Tech Officer | S | Common Stock | 5849 | $1.65 | 295,276.0000 | 0 | 1.94% | 0.00% |