# Atara Biotherapeutics, Inc. (ATRA) insider trading, Q3 2026

Canonical: https://sec-api.dev/insider-trading/atra

> 4 non-derivative transactions: 1 purchase ($1000K), 1 sale ($41K). CIK 1604464.

| Date | Insider | Relationship | Code | Shares | Price | Owned after | Filing |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 2026-09-04 | Cherry Brian N | Director | P | 104166.0 | 9.6 | 166486.0 | https://www.sec.gov/Archives/edgar/data/1604464/000090514826004085/0000905148-26-004085-index.htm |
| 2026-08-17 | Nguyen AnhCo | Director, Officer | S | 5062.0 | 8.08 | 132775.0 | https://www.sec.gov/Archives/edgar/data/1604464/000090514826003960/0000905148-26-003960-index.htm |
| 2026-07-22 | Redmile Group, LLC / Green Jeremy | Director | F | 60.0 |  | 636852.0 | https://www.sec.gov/Archives/edgar/data/1604464/000110465926086733/0001104659-26-086733-index.htm |
| 2026-07-22 | Redmile Group, LLC / Green Jeremy | Director | M | 195211.0 |  | 636912.0 | https://www.sec.gov/Archives/edgar/data/1604464/000110465926086733/0001104659-26-086733-index.htm |

Source: https://www.sec.gov/data-research/sec-markets-data/insider-transactions-data-sets

---
Independent. Not affiliated with, endorsed by, or sponsored by the U.S. Securities and Exchange Commission. Data is reproduced from public SEC filings and datasets. Not investment advice.
API: https://sec-api.dev/docs · ChatGPT app: https://chatgpt.com/plugins/plugin_asdk_app_6ae0ef2436ac8191941dae8a4d732669 · Free key: https://sec-api.dev/sign-up