Company · CIK 0001604464 · SIC 2836 — Biological Products, (No Diagnostic Substances) · Nasdaq
Atara Biotherapeutics, Inc. · ATRA
Insider activity reported against this company. All insider holders · On EDGAR ↗
Reported at this company — common stock
| Trade | Reported (ET) | Insider | Shares | Avg price | Total | Owned after | Δ stake | Flags |
|---|---|---|---|---|---|---|---|---|
| Sep 4, 2026 PForm 4 → | Sep 4, 6:20 pm EDT | Brian N CherryDirector | 104,166 | $9.60 | $999,994 | 166,486 | +167% | |
| Aug 17, 2026 SForm 4 → | Aug 26, 7:45 pm EDT | AnhCo NguyenPresident and CEO, Director | 5,062 | $8.08 | $40,883 | 132,775 | −3.67% | late |
| Jul 22, 2026 FMForm 4 → | Jul 24, 9:00 pm EDT | Redmile Group, LLC +1Director | 195,271 | — | — | 636,852 | — |
Reported at this company — derivatives (options, RSUs, warrants)
| Trade | Reported (ET) | Insider | Shares | Avg price | Total | Owned after | Δ stake | Flags |
|---|---|---|---|---|---|---|---|---|
| Jul 22, 2026 MForm 4 → | Jul 24, 9:00 pm EDT | Redmile Group, LLC +1Director | 195,211 | — | — | 0 | — |