Atara Biotherapeutics, Inc (ATRA) insider trading
Every open-market stock purchase and sale by Atara Biotherapeutics, Inc executives, directors, large shareholders and members of Congress, from SEC Form 4 filings. Sector: Other.
Insider activity at a glance
- Brian N Cherry (Insider) bought $1M in the last 90 days, more than doubling their stake.
- AnhCo Nguyen (CEO) sold $40.9K in the last 90 days.
Last 12 months: insiders bought $5.7M (2 buys) and sold $3.9M (9 sales). Last close $9.35 on Oct 21, 2026.
Recent ATRA insider trades
| Date | Insider | Trade | Value |
|---|---|---|---|
| Sep 4, 2026 | Brian N Cherry (Insider) | Bought | $1M |
| Aug 17, 2026 | AnhCo Nguyen (CEO) | Sold | $40.9K |
| Jul 22, 2026 | Redmile Group LLC (Director) | Bought (not open market) | — |
| Jul 22, 2026 | Redmile Group LLC (Director) | Sold (not open market) | — |
| Jul 22, 2026 | Redmile Group LLC (Director) | Bought (not open market) | — |
| Jul 22, 2026 | Redmile Group LLC (Director) | Bought (not open market) | — |
| Jul 22, 2026 | Redmile Group LLC (Director) | Bought (not open market) | — |
| Jun 11, 2026 | Brian N Cherry (Insider) | Bought (not open market) | — |
| Jun 9, 2026 | Gregory Austin Ciongoli (Insider) | Bought (not open market) | — |
| Jun 9, 2026 | Matthew K Fust (Insider) | Bought (not open market) | — |
| Jun 9, 2026 | William K Heiden (Insider) | Bought (not open market) | — |
| May 18, 2026 | AnhCo Nguyen (CEO) | Sold | $47.8K |
| May 18, 2026 | Yanina Grant-Huerta (C-suite exec) | Sold | $22K |
| May 7, 2026 | EcoR1 Capital LLC (10% owner) | Bought | $4.7M |
| May 7, 2026 | Panacea Innovation Ltd (Insider) | Sold | $3.2M |
| Mar 17, 2026 | Panacea Innovation Ltd (Insider) | Bought (not open market) | $1.7M |
| Mar 17, 2026 | Panacea Innovation Ltd (Insider) | Sold (not open market) | $26 |
| Mar 9, 2026 | Yanina Grant-Huerta (C-suite exec) | Bought (not open market) | — |
| Mar 9, 2026 | AnhCo Nguyen (CEO) | Bought (not open market) | — |
| Mar 2, 2026 | Yanina Grant-Huerta (C-suite exec) | Sold | $8.1K |
| Mar 2, 2026 | AnhCo Nguyen (CEO) | Sold | $7.3K |
| Mar 2, 2026 | AnhCo Nguyen (CEO) | Sold | $6.6K |
| Mar 2, 2026 | Yanina Grant-Huerta (C-suite exec) | Sold | $1.9K |
| Mar 2, 2026 | AnhCo Nguyen (CEO) | Sold | $1K |
| Mar 2, 2026 | Yanina Grant-Huerta (C-suite exec) | Sold | $508 |
Who's trading ATRA
- Brian N Cherry, Insider: bought $1M (1 buy), last Sep 4, 2026
- AnhCo Nguyen, CEO: sold $142K (8 sales), last Aug 17, 2026
- Redmile Group LLC, Director: other filings, last Jul 22, 2026
- William K Heiden, Insider: other filings, last Jun 9, 2026
- Matthew K Fust, Insider: other filings, last Jun 9, 2026
- Gregory Austin Ciongoli, Insider: other filings, last Jun 9, 2026
- Yanina Grant-Huerta, C-suite exec: sold $56.5K (8 sales), last May 18, 2026
- Panacea Innovation Ltd, Insider: sold $3.7M (2 sales), last May 7, 2026
- EcoR1 Capital LLC, 10% owner: bought $4.7M (1 buy), last May 7, 2026
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