$ATRA insider trading
Over the last 12 months, Atara Biotherapeutics insiders reported 2 buys totaling $5.7M and 7 sales totaling $3.8M across SEC Form 4 filings.
- Bought · 12m
- $5.7M 2 events
- Sold · 12m
- $3.8M 7 events
- Events · 12m
- 9 Form 4 filings, grouped
- Insiders · 12m
- 5 distinct reporters
- 10b5-1 share
- 0% of events, not dollars
All insider trades
Scroll the table sideways for price, value and marks.
| Date | Insider | Type | Shares | Avg price | Value | Δ stake | Marks |
|---|---|---|---|---|---|---|---|
| Sep 4, 2026 | Cherry Brian ND | ▲ Buy | 104,166 | $9.6 | $1000K | +167.1% | — |
| Aug 17, 2026 | Nguyen AnhCoPresident and CEO · O·D | ▼ Sale | 5,062 | $8.08 | $41K | -3.7% | late |
| May 7, 2026 | Panacea Innovation Ltd10% | ▼ Sale | 313,446 | $10.1 | $3.2M | -23.7% | indirect |
| May 7, 2026 | EcoR1 Capital, LLC10% | ▲ Buy | 507,407 | $9.35 | $4.7M | +48.6% | indirect |
| Mar 2, 2026 | Grant-Huerta YaninaChief Accounting Officer · O | ▼ Sale | 2,104 | $5.08 | $11K | -6.2% | 4 tranches |
| Mar 2, 2026 | Nguyen AnhCoPresident and CEO · O·D | ▼ Sale | 2,996 | $5.09 | $15K | -4.6% | 4 tranches |
| Jan 12, 2026 | Panacea Innovation Ltd10% | ▼ Sale | 80,554 | $6.07 | $489K | -5.7% | indirect |
| Nov 17, 2025 | Nguyen AnhCoPresident and CEO · O·D | ▼ Sale | 2,915 | $13.19 | $38K | -4.3% | 2 tranches |
| Nov 17, 2025 | Grant-Huerta YaninaChief Accounting Officer · O | ▼ Sale | 1,804 | $13.19 | $24K | -5.1% | 3 tranches |
| Aug 18, 2025 | Nguyen AnhCoPresident and CEO · O·D | ▼ Sale | 2,958 | $11.62 | $34K | -4.2% | 3 tranches |
| Aug 18, 2025 | Grant-Huerta YaninaChief Accounting Officer · O | ▼ Sale | 1,809 | $11.61 | $21K | -4.9% | 3 tranches |
| Aug 15, 2025 | Panacea Innovation Ltd10% | ▲ Buy | 55,000 | $12.19 | $670K | +4.1% | indirect |
Every $ATRA filing on this page is one API call away
The same Form 4 data over REST or MCP, already grouped into events with the plan flag and the dollar value read. A free key does 100 calls a day and needs no card. Prefer email? Atara Biotherapeutics filings can reach your inbox instead.
Corporate insiders — officers, directors and 10%+ owners — must report their trades to the SEC on Form 4 within two business days. This page shows open-market activity: purchases (code P), sales (S) and dispositions back to the issuer (D). Scheduled compensation events such as stock grants and option exercises are also filed on Form 4 but carry no trading signal, so they are not shown and counts here can be lower than the raw EDGAR filing total. We group each filing's transactions into one economic event (a laddered 10b5-1 sale is one event, not 25 rows), flag pre-arranged plans and late filings, and link every event to its AI-scored article in the $ATRA feed.