Atara Biotherapeutics (ATRA)10% owner sold ~$489K

~$489K

Approx. value · 81K sh @ $6.07

1.32M

Holds after · shares reported

Traded

Jan 12, 2026

Filed

Jan 15, 2026

The story around this disclosure

Every dated public record OQRO holds about the company from 60 days before to 120 days after, oldest first. It shows what was going on; none of it is a stated reason for the trade.

1. Nov 17, 2025Insider · 2 peopleInsiders: 5 sales (~$62K)
2. Dec 30, 2025Company filing · Form 8-K · Material agreementSigned an important agreement
3. Jan 12, 2026 · this disclosureInsider10% owner sold ~$489K of ATRA shares in the open market

What came next

1. Jan 12, 2026Company filing · Form 8-K · Results, Other newsReported its results, and reported other company news
2. Feb 20, 2026Company filing · Form 8-K · Material agreement, Unregistered sharesSigned an important agreement, and sold new shares without registering them (and 1 more item)
3. Mar 2, 2026Insider · 2 peopleInsiders: 8 sales (~$26K)
4. Mar 16, 2026Company filing · Form 8-K · ResultsReported its results
5. Apr 30, 2026Company filing · Form 8-K · Listing noticeReceived a notice from its stock exchange“On April 30, 2026, Atara Biotherapeutics, Inc. (the “Company”) received a notice (the “Notice”) from the Listing Qualifications Department (the “Staff”) of The Nasdaq Stock Market LLC (“Nasdaq”) notifying the Company that the Company no longer meets Nasdaq’s $50 million minimum market value for listed securities (“MVLS”) requirement pursuant to Nasdaq Listing Rule 5450(b)(2)(A) (the “MVLS Requirement”) for continued…”
6. May 7, 2026Insider · 2 peopleInsiders: 1 purchase (~$4.7M), 1 sale (~$3.2M)

How to read SEC Form 4

Form 4 is the filing that officers, directors and owners of more than 10% of a US-listed company must send to the SEC within two business days after they buy, sell or otherwise change their holding of the company's stock.

Full guide: What is an SEC Form 4?

What else is on file for Atara Biotherapeutics

For Atara Biotherapeutics, OQRO holds 2 insider filings (SEC Form 4 or Form 144) dated in the last 90 days.

These are records OQRO holds, counted by their date, not a measure of how much trading took place. Routine paperwork such as option exercises and tax withholding is left out. Everything for the company is on its ATRA page.

Other recent filings by Panacea Innovation Ltd, 10% owner

• SEC Form 4 at Atara Biotherapeutics (ATRA)May 11, 2026
• SEC Form 4 at Atara Biotherapeutics (ATRA)Aug 20, 2025
• SEC Form 4 at Atara Biotherapeutics (ATRA)Jul 21, 2025

The full history of Panacea Innovation Ltd, 10% owner is on the profile page.

How this filing works

• SEC Form 4
• Open-market purchase
• Rule 10b5-1 trading plans

Other disclosures at Atara Biotherapeutics

• SEC Form 4Sep 4, 2026
• SEC Form 4Aug 26, 2026
• SEC Form 4May 20, 2026
• SEC Form 4May 20, 2026
• SEC Form 4May 11, 2026
• SEC Form 4May 11, 2026

Everything OQRO holds on this company is on its ATRA page.