Form4insider filings, from the source

SEC Form 4 · accession 0000905148-26-002919

Atara Biotherapeutics, Inc. · ATRA

Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗

Reporting owner
Gregory Austin Ciongoli
Director · 10% Owner · Other
Period of report
Jun 9, 2026
Accepted (ET)
Jun 11, 2026 · 4:36 pm EDT
Rule 10b5-1 plan
box not checked
Issuer CIK
0001604464

Table I — non-derivative securities

SecurityDateCodeSharesPriceA/DOwned afterD/INature of ownership
Common StockF1Jun 9, 2026A12,000$0.00A12,000D
Common StockF2holding———1,209,395ISee Footnote

Table II — derivative securities

No Table II lines on this filing.

Explanation of responses

Remarks

Exhibit List: Exhibit 24 - Power of Attorney. Mr. Ciongoli serves as a director on the Board of Directors of the Issuer and, as a result, Adiumentum and Adiumentum GP are directors by deputization for purposes of Section 16 of the Securities Exchange Act of 1934, as amended. Neither Adiumentum nor Adiumentum GP have a pecuniary interest in the restricted stock units awarded to Mr. Ciongoli as reported in this Form 4, and therefore Adiumentum and Adiumentum GP have been excluded as reporting persons from this Form 4.