StockCIK 1604464
Atara Biotherapeutics, Inc. (ATRA): Insider Trades and Fund Holdings
In the past 12 months, Atara Biotherapeutics, Inc. insiders reported 1 open-market purchase worth $1000K and 1 sale worth $41K; 0 of the sales were reported as made under a 10b5-1 trading plan.
1Insider buys, 12 months
$1000KBought by insiders, 12 months
$41KSold by insiders, 12 months
0Tracked funds holding
Recent insider trades
Open-market purchases (code P) and sales (code S) from Form 4. Grants, option exercises and gifts are not shown. Latest filing: Sep 4, 2026.
| Filed | Insider | Type | Value |
|---|---|---|---|
| Sep 4 | Brian N. CherryDirector | ▲ BUY | $1000K |
| Aug 26 | Anhco NguyenCEO | ▼ SELL | $41K |
Source: SEC Form 4 filings, retrieved Oct 28, 2026. How we read filings
Insiders who traded in the past year
| Insider | Role | Buys | Bought | Sells | Sold |
|---|---|---|---|---|---|
| Brian N. Cherry | Director | 1 | $1000K | 0 | $0 |
| Anhco Nguyen | CEO | 0 | $0 | 1 | $41K |
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Reading these numbers
Insiders sell for many reasons: taxes, diversification, a house. Purchases with their own money are rarer and are usually read as more informative. A Form 4 is due within two business days of the trade. How to read a Form 4 →