Atara Biotherapeutics Inc

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Atara Biotherapeutics Inc
Ticker	ATRA
CIK #	0001604464
CUSIP	046513206
Sector	Life Sciences - Biological Products, (No Disgnostic Substances)
Address	3260 Bayshore Boulevard, Brisbane, CA 94005
Source	[EDGAR]

CIK	Filing	2011 - 2026
[0001604464]	10-K
[0001604464]	10-Q
[0001604464]	3
[0001604464]	4
[0001604464]	8-K
[0001604464]	SC 13D
[0001604464]	SC 13G

Form 13D/13G Filer	Form 13D/13G Subject	Filed	% Owned
Adage Capital Management LP	Atara Biotherapeutics Inc	[2026-05-13]	0.0
Point72 Asset Management LP	Atara Biotherapeutics Inc	[2026-05-08]	0.0
Redmile Group LLC	Atara Biotherapeutics Inc	[2025-05-23]	0.0
Panacea Innovation Ltd	Atara Biotherapeutics Inc	[2025-05-21]	0.0
Panacea Innovation Ltd	Atara Biotherapeutics Inc	[2025-02-06]	0.0
Adiumentum Capital Fund I LP	Atara Biotherapeutics Inc	[2024-05-22]	6.7
Citadel Advisors LLC	Atara Biotherapeutics Inc	[2024-03-18]	6.4
EcoR1 Capital LLC	Atara Biotherapeutics Inc	[2023-11-21]	0.9
Wasatch Advisors Inc	Atara Biotherapeutics Inc	[2023-02-08]	8.8
Goldman Sachs Group Inc	Atara Biotherapeutics Inc	[2023-02-07]	6.4
State Street Corp	Atara Biotherapeutics Inc	[2023-02-03]	8.06
FMR LLC	Atara Biotherapeutics Inc	[2022-02-09]	0.0
Point72 Asset Management LP	Atara Biotherapeutics Inc	[2021-12-21]	5.1
JPMorgan Chase & Co	Atara Biotherapeutics Inc	[2021-01-08]	7.3
Maverick Capital Ltd	Atara Biotherapeutics Inc	[2020-02-14]	9.2
Bridger Management LLC	Atara Biotherapeutics Inc	[2019-11-01]	5.5
Camber Capital Management LP	Atara Biotherapeutics Inc	[2019-07-29]	2013.0
Vanguard Group Inc	Atara Biotherapeutics Inc	[2019-02-11]	6.16
Camber Capital Management LLC	Atara Biotherapeutics Inc	[2018-01-05]	2013.0
Morgan Stanley	Atara Biotherapeutics Inc	[2017-12-07]	5.0
Bridger Management LLC	Atara Biotherapeutics Inc	[2017-04-21]	5.2
Arrowpoint Asset Management LLC	Atara Biotherapeutics Inc	[2017-02-13]	5.4
BlackRock Inc	Atara Biotherapeutics Inc	[2017-01-30]	6.0
Redmile Group LLC	Atara Biotherapeutics Inc	[2016-02-16]	5.36
FMR LLC	Atara Biotherapeutics Inc	[2016-02-12]	0.0
Amgen Inc	Atara Biotherapeutics Inc	[2015-04-01]	9.0
HELU Carlos Slim	Atara Biotherapeutics Inc	[2015-02-17]	6.6
DAG Ventures V-QP LP	Atara Biotherapeutics Inc	[2015-02-17]	9.4
Kleiner Perkins Caufield & Byers XV LLC	Atara Biotherapeutics Inc	[2015-02-17]	12.9
Ciechanover Isaac E	Atara Biotherapeutics Inc	[2015-02-13]	5.3
Celgene Corp /DE/	Atara Biotherapeutics Inc	[2015-02-13]	9.0
FMR LLC	Atara Biotherapeutics Inc	[2015-02-13]	0.0
Domain Partners VIII LP	Atara Biotherapeutics Inc	[2015-02-05]	10.6
Baupost Group LLC/MA	Atara Biotherapeutics Inc	[2014-11-10]	12.86

Form 3/4/5 Filer	2011 - 2026
Sarney Kevin G
Atara Biotherapeutics Inc
Cherry Brian N
Fust Matthew K
Heiden William K
Ciongoli Gregory Austin
Nguyen AnhCo
Grant-Huerta Yanina
Panacea Innovation Ltd
Huang James
EcoR1 Capital LLC
Mallik Ameet
Touchon Pascal
Roncarolo Maria Grazia
Gallagher Carol Giltner
Subramanian Nachiappan
Redmile Group LLC
Green Jeremy
Adiumentum Capital Fund I LP
Adiumentum Capital Fund I GP LLC
Hyllengren Eric J
Henrich Jill
Murugan Amar
Joshi Manher
Dobmeier Eric
Seidenberg Beth C
Banard Charlene A
Koppikar Utpal
Dupont Jakob
Baynes Roy D
Renaud Ronald C JR
Yarema Kristin
Newell Joe
Ciechanover Isaac E
Berger Dietmar
Kim Mina
Porter Derrell
Marcus Joel S
Haqq Christopher
Soffer Gad
Clark Mitchall G
McGrath John
Turner Heather D
KPCB XV Founders Fund LLC
KPCB XV Associates LLC
Kleiner Perkins Caufield & Byers XV LLC
Weber Eckard
DAG Ventures Management V LLC
DAG Ventures V LP
Williams Greg
Cadeddu John J
Pianim Nicholas K
DAG Ventures V-QP LP
Chung Young J
Goodrich R Thomas
DP VIII Associates LP
Vitullo Nicole
Treu Jesse I
Schoemaker Kathleen K
Blair James C
Dovey Brian H
Halak Brian K
Domain Partners VIII LP

Insider Transaction (Form 3/4/5)	Date	Action	Shares	Price	Value ($)
Panacea Innovation Ltd +1 Warrants · derivative	2026-03-17	Option exercise	259,163	$6.61	1,713,067
Panacea Innovation Ltd +1 Common Stock	2026-03-17	Option exercise	259,163	$0.00
Panacea Innovation Ltd +1 Common Stock	2026-03-17	Tax withheld	5	$5.23	26
Grant-Huerta Yanina Common Stock	2026-03-09	Grant	20,300	$0.00
Nguyen AnhCo Common Stock	2026-03-09	Grant	81,100	$0.00
Nguyen AnhCo Common Stock	2026-03-02	Sell	1,298	$5.09	6,607
Nguyen AnhCo Common Stock	2026-03-02	Sell	198	$5.08	1,006
Nguyen AnhCo Common Stock	2026-03-02	Sell	1,442	$5.09	7,340
Grant-Huerta Yanina Common Stock	2026-03-02	Sell	1,603	$5.08	8,143
Grant-Huerta Yanina Common Stock	2026-03-02	Sell	377	$5.08	1,915
Nguyen AnhCo Common Stock	2026-03-02	Sell	58	$5.08	295
Grant-Huerta Yanina Common Stock	2026-03-02	Sell	100	$5.08	508
Grant-Huerta Yanina Common Stock	2026-03-02	Sell	24	$5.08	122
Panacea Innovation Ltd +1 Common Stock	2026-01-12	Sell	80,554	$6.07	488,963
Panacea Innovation Ltd +1 Common Stock	2025-11-28	Option exercise	48,737	$0.00
Panacea Innovation Ltd +1 Common Stock	2025-11-28	Tax withheld	1	$14.03	14
Panacea Innovation Ltd +1 Warrants · derivative	2025-11-28	Option exercise	48,737	$6.61	322,152
Grant-Huerta Yanina Common Stock	2025-11-17	Sell	74	$13.19	976
Grant-Huerta Yanina Common Stock	2025-11-17	Sell	85	$13.19	1,121
Nguyen AnhCo Common Stock	2025-11-17	Sell	2,859	$13.19	37,710
showing 20 of 200 most recent transactions

13F Ownership Over Time	Holders	Shares Held
2026-03-31	34	2,564,458
2025-12-31	42	2,049,879
2025-09-30	38	1,883,567
2025-06-30	33	1,805,400
2025-03-31	38	2,086,794
2024-12-31	44	2,390,349
2024-09-30	36	2,415,922
2024-06-30	49	2,838,448
2024-03-31	83	87,396,818
2023-12-31	92	68,727,721
2023-09-30	110	89,202,902
2023-06-30	119	91,300,153

Form 13F Holdings
Firm	Period	DFND	Voting	Shares
Kerr Financial Planning Corp	[2026-06-30]	SOLE	24	24
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Atara Biotherapeutics Inc

Stock Issuer and Owners