Atara Biotherapeutics, Inc. insider trading
ATRA$9.23-0.14 (-1.49% today)
“Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise.”
Insider Trading vs Stock Price
Insider Trading vs Stock Price data
Showing the 1Y range: Oct 8, 2025 to Oct 8, 2026. Price (-41.8%). 0 insider transactions plotted in this window as 0 markers; nearby trades of the same kind are grouped.
| Date | Category | Person | Role | Action | Amount | Change in holding |
|---|
Open market purchase
Open market sellNet dollar flow · Buy / Sell balance
PremiumQ2 '25Q3 '25Q4 '25Q1 '26Q2 '26Q3 '26
Unlock quarterly net flowKey players
- ECEcoR1 Capital, LLC15.4617%
- GAGregory Austin Ciongoli12.1681%
- BNBrian N. Cherry1.6586%
- ANAnhCo Nguyen1.3228%
- PTPascal Touchon0.7766%
- EJEric J. Hyllengren0.5602%
- YGYanina Grant-Huerta0.4945%
- WKWilliam K. Heiden0.3406%
- CGCarol Giltner Gallagher0.3289%
- MKMatthew K. Fust0.3007%
AI Activity Analysis
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Insider activity
Fromto
| Company | Insider / role | Action | ΔOwn | Avg price | Amount | ||
|---|---|---|---|---|---|---|---|
| ATRA | Brian N. Cherry | Open market purchase$1M | +167.2% | $9.60 | $1M | Sep 4, 2026 | Sep 4, 2026 |
| ATRA | AnhCo Nguyen | Open market sell$40.9K | -3.7% | $8.08 | $40.9K | Aug 17, 2026 | Aug 26, 2026 |
| ATRA | AnhCo Nguyen | Open market sell$47.9K | -3.7% | $9.13 | $47.9K | May 18, 2026 | May 20, 2026 |
| ATRA | Yanina Grant-Huerta | Open market sell$22K | -4.6% | $9.13 | $22K | May 18, 2026 | May 20, 2026 |
| ATRA | Panacea Innovation Ltd | Open market sell$3.17M | -19.2% | $10.10 | $3.17M | May 7, 2026 | May 11, 2026 |
| ATRA | EcoR1 Capital, LLC | Open market purchase$4.74M | +48.6% | $9.35 | $4.74M | May 7, 2026 | May 11, 2026 |
| ATRA | Yanina Grant-Huerta | Open market sell$508 | -0.3% | $5.08 | $508 | Mar 2, 2026 | Mar 4, 2026 |
| ATRA | Yanina Grant-Huerta | Open market sell$1.92K | -1.2% | $5.08 | $1.92K | Mar 2, 2026 | Mar 4, 2026 |
| ATRA | Yanina Grant-Huerta | Open market sell$8.14K | -4.7% | $5.08 | $8.14K | Mar 2, 2026 | Mar 4, 2026 |
| ATRA | Yanina Grant-Huerta | Open market sell$122 | -0.1% | $5.08 | $122 | Mar 2, 2026 | Mar 4, 2026 |
| ATRA | AnhCo Nguyen | Open market sell$7.34K | -2.3% | $5.09 | $7.34K | Mar 2, 2026 | Mar 4, 2026 |
| ATRA | AnhCo Nguyen | Open market sell$6.61K | -2.0% | $5.09 | $6.61K | Mar 2, 2026 | Mar 4, 2026 |
| ATRA | AnhCo Nguyen | Open market sell$295 | -0.1% | $5.08 | $295 | Mar 2, 2026 | Mar 4, 2026 |
| ATRA | AnhCo Nguyen | Open market sell$1.01K | -0.3% | $5.08 | $1.01K | Mar 2, 2026 | Mar 4, 2026 |
| ATRA | James Huang | Open market sell$489K | -5.7% | $6.07 | $489K | Jan 12, 2026 | Jan 14, 2026 |
| ATRA | AnhCo Nguyen | Open market sell$739 | -0.1% | $13.19 | $739 | Nov 17, 2025 | Nov 19, 2025 |
| ATRA | AnhCo Nguyen | Open market sell$37.7K | -4.2% | $13.19 | $37.7K | Nov 17, 2025 | Nov 19, 2025 |
| ATRA | Yanina Grant-Huerta | Open market sell$976 | -0.2% | $13.19 | $976 | Nov 17, 2025 | Nov 19, 2025 |
| ATRA | Yanina Grant-Huerta | Open market sell$1.12K | -0.3% | $13.19 | $1.12K | Nov 17, 2025 | Nov 19, 2025 |
| ATRA | Yanina Grant-Huerta | Open market sell$21.7K | -4.7% | $13.19 | $21.7K | Nov 17, 2025 | Nov 19, 2025 |