| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
Across the last three months, Atara Biotherapeutics, Inc.'s insiders have accumulated 99,104 shares worth roughly $959K on balance.
ATRA sits in the Biotechnology industry within the Health Care sector, so this activity is best read against the sector's broader insider trend.
| Role | Insider | Shares | Value | 30d |
|---|---|---|---|---|
| 10% | 1.55M | $14.51M | - | |
| 10% | 1.01M | $10.21M | - | |
| Dir | 636.9K | - | - | |
| Dir | 166.5K | $1.60M | - | |
| CEO | 132.8K | $1.07M | - |
Buys and sells only
| Date | Insider | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| Sep 4, 2026 | Cherry Brian N | Director | Buy | 104,166 | $9.60 | $999,993.60 | +167.1% | - | - | |
| Aug 17, 2026 | Nguyen Anhco64 | President And CEO | Sell | 5,062 | $8.08 | $40,882.74 | -3.7% | - | - | |
| May 18, 2026 | Nguyen Anhco64 | President And CEO | Sell | 5,241 | $9.13 | $47,844.56 | -3.7% | -8.6% | - | |
| May 18, 2026 | Grant-Huerta Yanina | Chief Accounting Officer | Sell | 2,414 | $9.13 | $22,036.44 | -4.6% | -8.6% | - | |
| May 7, 2026 | Panacea Innovation Ltd | 10% Owner | Sell | 313,446 | $10.10 | $3,165,020.99 | -23.7% | -14.0% | - | |
| May 7, 2026 | Ecor1 Capital, LLC75 | 10% Owner | Buy | 507,407 | $9.35 | $4,744,255.45 | +48.6% | -14.0% | - | |
| Mar 2, 2026 | Grant-Huerta Yanina | Chief Accounting Officer | Sell | 2,104 | $5.08 | $10,690.91 | -6.2% | +109.4% | - | |
| Mar 2, 2026 | Nguyen Anhco64 | President And CEO | Sell | 2,996 | $5.09 | $15,237.36 | -4.6% | +109.4% | - | |
| Jan 12, 2026 | Panacea Innovation Ltd | 10% Owner | Sell | 80,554 | $6.07 | $489,019.17 | -5.7% | -16.8% | - | |
| Nov 17, 2025 | Nguyen Anhco64 | President And CEO | Sell | 2,915 | $13.19 | $38,437.30 | -4.3% | -65.7% | - |