Atara Biotherapeutics, Inc.

Ownership Transactions Reported by 25 Insiders

	Insiders	Shares	%	Avg Price	Total $
Buys	1	+74.3K	78.9%	$11.53	+$857K
Sells	4	-19.9K	21.1%	$8.89	-$177K
Net	-3	+54.4K	57.8%		+$680K

Name	Relationship	Holdings Value	Past Year Net Change	Change %	Report Date
Panacea Innovation Ltd	10%+ Owner	$17.1M	+$857K	+5.27%	Aug 15, 2025
Adiumentum Capital Fund I LP	Director, Other*, 10%+ Owner	$10.5M			May 16, 2025
Redmile Group, LLC	Director	$3.36M			May 16, 2025
AnhCo Nguyen	President and CEO, Director	$789K	-$98.5K	-11.1%	Aug 18, 2025
Pascal Touchon	Director	$589K			Jun 10, 2025
Yanina Grant-Huerta	Chief Accounting Officer	$409K	-$36K	-8.08%	Aug 18, 2025
Eric J. Hyllengren	Former EVP, CFO & COO	$393K	-$23.7K	-5.69%	Mar 31, 2025
Carol Gallagher	Director	$250K			Jun 10, 2025
Eric Dobmeier	Director	$219K			Nov 10, 2023
Amar Murugan	EVP, Chief Legal Officer	$178K			Aug 16, 2024
William K. Heiden	Director	$168K			Jun 10, 2025
Matthew K. Fust	Director	$138K			Jun 10, 2025
Maria Roncarolo	Director	$131K			Jun 10, 2025
Jill Henrich	EVP, Chief Regulatory Officer	$131K	-$18.6K	-12.5%	Mar 3, 2025
Ameet Mallik	Director	$128K			Jun 10, 2025
Jakob Dupont	EVP, Head of R&D	$113K			Mar 2, 2023
Charlene A. Banard	EVP, Chief Technical Officer	$107K			May 16, 2023
Utpal Koppikar	Chief Financial Officer	$70.8K			Mar 2, 2023
Kristin Yarema	Chief Commercial Officer	$66.7K			Mar 1, 2022
Manher Joshi	EVP, Chief Medical Officer	$66.6K			Nov 16, 2023
Beth C. Seidenberg	Director	$45.1K			May 31, 2023
Joe Newell	Chief Operations Officer	$44K			Nov 16, 2021
Roy D. Baynes	Director	$16.9K			Jun 23, 2022
Ronald C. Renaud JR	Director	$12.3K			Jun 23, 2022
Nachiappan Subramanian	Director				May 16, 2025

Insider	Symbol	Class	Transaction	%	Value $	* Price $	Shares	Shares Owned	Date	Ownership

* An asterisk sign (*) next to the price indicates that the price is likely invalid.