Brian N. Cherry - 04 Sep 2026 Form 4 Insider Report for Atara Biotherapeutics, Inc. (ATRA)

Reporting relationship: Director
Issuer ticker: ATRA
Reported as of: 04 Sep 2026
Net transaction value: +$999,994
SEC form: 4
Accepted by SEC: 04 Sep 2026, 18:20:04 UTC
Prior SEC filing: 15 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Brian Cherry

Key filing fact

Brian N. Cherry filed Form 4 for Atara Biotherapeutics, Inc. (ATRA) on 04 Sep 2026.

Key facts

This page summarizes Brian N. Cherry's Form 4 filing for Atara Biotherapeutics, Inc. (ATRA).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 04 Sep 2026, 18:20.

Change

Previous filing in this sequence was filed on 15 Jun 2026.
Current net transaction value: +$999,994.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001290922 Primary reporting owner

Cherry Brian N

Relationship: Director
Address: C/O ATARA BIOTHERAPEUTICS, INC., 1280 RANCHO CONEJO BOULEVARD, THOUSAND OAKS
Signature: /s/ Brian Cherry
Signature date: 04 Sep 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ATRA transaction

Common Stock

Purchase

Transaction value: $999,994
Shares: +104,166
Change %: +167%
Price: $9.60
Shares after: 166,486
Date: 04 Sep 2026
Ownership: Direct
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

Represents shares purchased by the Reporting Person from the Issuer, through its sales agent, pursuant to that certain Sales Agreement, dated November 1, 2023, by and between the Issuer and TD Securities (USA) LLC.

SEC remarks

Exhibit List: Exhibit 24 - Power of Attorney