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ATARA BIOTHERAPEUTICS COM NEW (ATRA)

Institutional ownership, SEC filings and insider activity

Sector: Healthcare & Pharma · SEC CIK 0001604464 · EDGAR filings · Updated 2026-07-24

ATARA BIOTHERAPEUTICS COM NEW (ATRA) has reported institutional ownership of 31.4%, with 33 institutional managers holding positions valued at $12.1M per the latest 13F reporting period. SEC filings include an active notice of delisting or failure to satisfy a continued listing rule (8-K Item 3.01), substantial-doubt (going concern) disclosure per the filings.

Filings this week (2)

• 2026-07-24 — Insider transaction reported (Form 4)
• 2026-07-24 — SCHEDULE 13D/A filed

Every filing links to the official SEC document. Real-time filing alerts for this company are available inside the app.

Latest updates

• 2026-07-06 — Initial insider ownership filed (Form 3)
• 2026-06-26 — Current report (8-K) filed
• 2026-06-15 — Insider transaction reported (Form 4)
• 2026-06-15 — Initial insider ownership filed (Form 3)

Institutional ownership overview

According to SEC 13F filings tracked by Sightfile, ATARA BIOTHERAPEUTICS COM NEW has 33 institutional holders and institutional ownership of 31.4%.

Insider activity

Insiders reported 37 transactions (2 buys, 22 sells) across 12 reporting insiders, with a net reported value of $187.2K.

Data flags from SEC filings

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