There have been 50 recent insider transactions recorded for Atara Biotherapeutics, Inc. (ATRA), including 14 buys and 30 sells. Total insider buying was valued at $856.82K and total insider selling at $3.85M.
Notable insiders with recent activity include Panacea Innovation Ltd, Nguyen Anhco, Grant-huerta Yanina. Insider transactions can provide insights into how company leadership views the stock's valuation and future prospects.
Insider Transactions — ATRA
| Date |
Name |
Role |
Transaction |
Shares |
Avg. Price |
Value |
Shares Owned |
| 2026-03-17 |
Panacea Innovation Ltd |
10 Percent Owner |
Option Exercise (Sell) |
259,163 |
$0.00 |
$25.92 |
- |
| 2026-03-09 |
Nguyen Anhco |
President and CEO |
RSU Award |
81,100 |
- |
- |
143,078 |
| 2026-03-09 |
Grant-huerta Yanina |
Chief Accounting Officer |
RSU Award |
20,300 |
- |
- |
52,050 |
| 2026-03-02 |
Nguyen Anhco |
President and CEO |
Informative Sell |
1,442 |
$5.09 |
$7.34K |
61,978 |
| 2026-03-02 |
Grant-huerta Yanina |
Chief Accounting Officer |
Informative Sell |
100 |
$5.08 |
$508.30 |
31,750 |
| 2026-01-12 |
Panacea Innovation Ltd |
10 Percent Owner |
Informative Sell |
80,554 |
$6.07 |
$489.02K |
1,324,446 |
| 2025-11-28 |
Panacea Innovation Ltd |
10 Percent Owner |
Tax Withholding of RSU |
1 |
$14.03 |
$14.03 |
48,736 |
| 2025-11-17 |
Nguyen Anhco |
President and CEO |
Informative Sell |
56 |
$13.19 |
$738.53 |
64,974 |
| 2025-11-17 |
Grant-huerta Yanina |
Chief Accounting Officer |
Informative Sell |
74 |
$13.19 |
$976.13 |
33,454 |
| 2025-08-18 |
Nguyen Anhco |
President and CEO |
Informative Sell |
1,620 |
$11.62 |
$18.82K |
67,889 |
| 2025-08-18 |
Grant-huerta Yanina |
Chief Accounting Officer |
Informative Sell |
1,668 |
$11.61 |
$19.37K |
35,258 |
| 2025-08-15 |
Panacea Innovation Ltd |
10 Percent Owner |
Informative Buy |
55,000 |
$12.19 |
$670.42K |
1,405,000 |
| 2025-07-17 |
Panacea Innovation Ltd |
10 Percent Owner |
Informative Buy |
19,335 |
$9.64 |
$186.37K |
1,350,000 |
| 2025-06-10 |
Heiden William K |
Director |
RSU Award |
7,828 |
- |
- |
22,188 |
| 2025-06-10 |
Gallagher Carol Giltner |
Director |
RSU Award |
7,828 |
- |
- |
33,012 |
| 2025-06-10 |
Fust Matthew K |
Director |
RSU Award |
7,828 |
- |
- |
18,188 |
| 2025-06-10 |
Touchon Pascal |
Director |
RSU Award |
7,828 |
- |
- |
77,955 |
| 2025-06-10 |
Roncarolo Maria Grazia |
Director |
RSU Award |
7,828 |
- |
- |
17,368 |
| 2025-06-10 |
Mallik Ameet |
Director |
RSU Award |
7,828 |
- |
- |
16,928 |
| 2025-05-16 |
Adiumentum Capital Fund I Lp |
10 Percent Owner, Other: See Remarks |
RSU Award |
227,000 |
$0.00 |
$22.70 |
377,193 |
| 2025-05-16 |
Nguyen Anhco |
President and CEO |
Informative Sell |
3,276 |
$6.76 |
$22.16K |
70,847 |
| 2025-05-16 |
Grant-huerta Yanina |
Chief Accounting Officer |
Informative Sell |
2,218 |
$6.76 |
$15K |
37,067 |
| 2025-05-16 |
Panacea Innovation Ltd |
10 Percent Owner |
Unknown |
307,900 |
$0.00 |
$30.79 |
- |
| 2025-05-16 |
Redmile Group, Llc |
Director |
Unknown |
4,872 |
$9.32 |
$45.38K |
- |
| 2025-05-16 |
Subramanian Nachiappan |
Director |
Unknown |
- |
- |
- |
- |
| 2025-03-31 |
Hyllengren Eric J |
Other: Former EVP, CFO & COO |
Return of Shares |
331 |
$97.75 |
$32.36K |
- |
| 2025-03-31 |
Grant-huerta Yanina |
Chief Accounting Officer |
Unknown |
550 |
$97.75 |
$53.76K |
- |
| 2025-03-03 |
Hyllengren Eric J |
EVP, CFO and COO |
Informative Sell |
1,211 |
$7.00 |
$8.47K |
56,231 |
| 2025-03-03 |
Nguyen Anhco |
President and CEO |
Informative Sell |
3,331 |
$7.00 |
$23.31K |
74,123 |
| 2025-03-03 |
Henrich Jill |
EVP, Chief Regulatory Officer |
Informative Sell |
1,059 |
$7.00 |
$7.41K |
18,679 |
| 2025-01-27 |
Hyllengren Eric J |
EVP, CFO and COO |
RSU Award |
34,050 |
- |
- |
57,442 |
| 2024-11-18 |
Hyllengren Eric J |
EVP, CFO and COO |
Informative Sell |
1,364 |
$11.20 |
$15.27K |
23,392 |
| 2024-11-18 |
Nguyen Anhco |
President and CEO |
Informative Sell |
1,664 |
$11.20 |
$18.63K |
77,454 |
| 2024-11-18 |
Henrich Jill |
EVP, Chief Regulatory Officer |
Informative Sell |
1,000 |
$11.20 |
$11.2K |
19,378 |
| 2024-09-09 |
Nguyen Anhco |
President and CEO |
RSU Award |
45,000 |
- |
- |
79,118 |
| 2024-09-03 |
Adiumentum Capital Fund I Lp |
10 Percent Owner |
Disposition |
150,193 |
$0.00 |
$15.02 |
- |
| 2024-08-16 |
Touchon Pascal |
President and CEO |
Informative Sell |
276 |
$6.63 |
$1.83K |
70,127 |
| 2024-08-16 |
Murugan Amar |
EVP, Chief Legal Officer |
Informative Sell |
89 |
$6.63 |
$590.16 |
26,827 |
| 2024-08-16 |
Hyllengren Eric J |
EVP, CFO |
Informative Sell |
29 |
$6.63 |
$192.30 |
24,756 |
| 2024-08-16 |
Nguyen Anhco |
EVP, Chief Sci. & Tech Officer |
Informative Sell |
56 |
$6.63 |
$371.34 |
34,118 |
| 2024-08-16 |
Henrich Jill |
EVP, Global Head Ra & Quality |
Informative Sell |
132 |
$6.63 |
$875.29 |
20,378 |
| 2024-08-12 |
Touchon Pascal |
President and CEO |
Return of Shares |
7,075 |
$427.63 |
$3.03M |
- |
| 2024-07-31 |
Grant-huerta Yanina |
Chief Accounting Officer |
Unknown |
275 |
$11.00 |
$3.03K |
- |
| 2024-05-16 |
Touchon Pascal |
President and CEO |
Informative Sell |
81,506 |
$0.62 |
$50.29K |
1,829,146 |
| 2024-05-16 |
Murugan Amar |
EVP, Chief Legal Officer |
Informative Sell |
32,401 |
$0.62 |
$19.99K |
695,120 |
| 2024-05-16 |
Hyllengren Eric J |
EVP, CFO |
Informative Sell |
28,648 |
$0.62 |
$17.68K |
645,671 |
| 2024-05-16 |
Nguyen Anhco |
EVP, Chief Sci. & Tech Officer |
Informative Sell |
42,899 |
$0.62 |
$26.47K |
898,498 |
| 2024-05-16 |
Henrich Jill |
EVP, Global Head Ra & Quality |
Informative Sell |
25,750 |
$0.62 |
$15.89K |
529,251 |
| 2024-04-06 |
Grant-huerta Yanina |
Chief Accounting Officer |
Unknown |
800 |
$198.00 |
$158.4K |
- |
| 2024-03-31 |
Heiden William K |
Director |
RSU Award |
150,000 |
- |
- |
359,000 |
■ Informative Buy/Sell — open market transaction (most significant)
■ Uninformative Buy — award, option exercise, conversion
■ Uninformative Sell — tax withholding, award vest sale
■ Neutral — gift, trust, expiry
