ATRA 8-K: SEC filing

Atara Biotherapeutics

Filed with the SEC on Nov 10, 2026 · accession 0001104659-26-125171

ATRA filed a 8-K (current report) with the SEC on Nov 10, 2026. A report of a major event, filed within four business days: results, deals, leadership changes, bankruptcy and more. The stock moved -1.0% by the first close after the filing.

Summary of the filing

Atara Biotherapeutics announced its third quarter 2026 financial results and operational progress via a press release furnished under Item 2.02 of Form 8-K.

For details, click here →How to read a 8-K →

Key details

RegistrantAtara Biotherapeutics, Inc.

President and chief executive officerAnhCo Thieu Nguyen, Ph.D.

How ATRA stock reacted

Close before

$8.18

Nov 9, 2026

First close after

-0.98%

$8.10

5 trading days

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Since filing

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Frequently asked questions

What did ATRA file with the SEC on Nov 10, 2026?

ATRA filed a 8-K (SEC filing). Atara Biotherapeutics announced its third quarter 2026 financial results and operational progress via a press release furnished under Item 2.02 of Form 8-K.

How do I read a 8-K?

A report of a major event, filed within four business days: results, deals, leadership changes, bankruptcy and more. The "Item" number tells you the topic (e.g. 2.02 results, 5.02 executive change, 1.01 new agreement, 1.03 bankruptcy). Exhibits (99.1 press release) usually hold the details.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A 8-K (current report): A report of a major event, filed within four business days: results, deals, leadership changes, bankruptcy and more.

How did ATRA stock react to this filing?

ATRA closed at $8.18 before the filing and $8.10 on Nov 10, 2026 (-0.98%).

Other ATRA SEC filings

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