Form4.ai tracks every SEC insider trade in real time. See every ATRA insider filing with a free account — no card.
See every ATRA insider filing — free account, no card.
Free accountAtara Biotherapeutics, Inc. (ATRA) has 2 SEC Form 4 insider filings on record in the last 90 days. That includes 1 insider purchase totalling $1000K, and 1 sales totalling $41K. Most recent filing: Sept. 4, 2026.
Open-market value, last 90 days
Form 4 filings by type, last 90 days
| Date | Insider | Trade | Value | Price since buy |
|---|---|---|---|---|
| Sep 4, 2026 SEC filing | Cherry Brian N Director | Bought | $999,994 | +1.6% 30D |
| Aug 26, 2026 SEC filing | Nguyen AnhCo President and CEO | Sold | $40,883 | — |
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Form 4 is the filing company officers, directors and 10% shareholders must submit to the SEC within two business days of trading their own company's stock. Open-market purchases generally carry more signal than sales, which are often scheduled in advance. More on how this works.