ATRA insider trading — Atara Biotherapeutics, Inc.
Over the last 90 days, insiders at Atara Biotherapeutics, Inc. (ATRA) made 1 open-market purchase worth $1,000K and 1 open-market sale worth $41K, making them net buyers by $959K. The largest purchase was by Cherry Brian N (Director), who bought 104,166 shares for $1,000K on Sep 4, 2026. The largest sale was by Nguyen Anhco (President and CEO), who sold 5,062 shares for $41K on Aug 17, 2026.
Updated Oct 16, 2026.
Recent ATRA insider transactions
Every Form 4 filed by Atara Biotherapeutics, Inc. officers, directors and 10% owners in the last 90 days, newest first. P = open-market purchase, S = open-market sale; other codes are awards, option exercises, tax withholding or gifts.
| Trade date | Insider | Role | Type | Ownership | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|---|
| Sep 4, 2026 | Cherry Brian N | Director | P · Purchase | Direct | 104,166 | $9.60 | $1,000K | Form 4 |
| Aug 17, 2026 | Nguyen Anhco | President and CEO | S · Sale | Direct | 5,062 | $8.08 | $41K | Form 4 |
| Jul 22, 2026 | Redmile Group, Llc, Green Jeremy | Director | M · Option exercise | Indirect | 195,211 | — | — | Form 4 |
| Jul 22, 2026 | Redmile Group, Llc, Green Jeremy | Director | F · Tax withholding | Indirect | 60 | — | — | Form 4 |
ATRA insider trading FAQ
Are insiders buying ATRA stock?
Yes. In the last 90 days, Atara Biotherapeutics, Inc. insiders made 1 open-market purchase totaling $1,000K, and 1 open-market sale totaling $41K. Purchases with the insider's own money are generally seen as a stronger signal than sales, which happen for many reasons (taxes, diversification, planned 10b5-1 sales).
Who are the insiders trading ATRA?
Recent buyers: Cherry Brian N. Recent sellers: Nguyen Anhco.
Where does ATRA insider trading data come from?
Every transaction comes from SEC Form 4 filings on EDGAR. Company officers, directors and 10% owners must file a Form 4 within two business days of buying or selling. InsiderBolt reads these filings directly from the SEC.
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Insider trading data is for informational purposes only and is not investment advice. Filings can be amended; always confirm details on SEC EDGAR.