# Atara Biotherapeutics, Inc.: Form SCHEDULE 13D/A, filed May 14, 2026

- Company: [Atara Biotherapeutics, Inc.](/companies/atra.md) (CIK 1604464)
- Form: SCHEDULE 13D/A
- Filed: 2026-05-14
- Accepted by EDGAR: May 14, 2026, 21:00 ET
- Period: not reported
- Accession: 0001104659-26-061506
- Inline XBRL: no
- Main document: https://www.sec.gov/Archives/edgar/data/1604464/000110465926061506/xslSCHEDULE_13D_X02/primary_doc.xml
- All documents and exhibits: https://www.sec.gov/Archives/edgar/data/1604464/000110465926061506/

## Sections

Sections are extracted only from 10-K and 10-Q reports. Read this filing’s documents on sec.gov. https://www.sec.gov/Archives/edgar/data/1604464/000110465926061506/xslSCHEDULE_13D_X02/primary_doc.xml

Filed May 14, 2026.
Source: SEC EDGAR, the filing index for accession 0001104659-26-061506. Last ingested by Listed: Oct 24, 2026, 15:14 ET. No prices; not investment advice.