Atara Biotherap (ATRA.US) Shareholders - Institutional Holders, Major Shareholders & Insiders | Longbridge

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Shareholder Type

Hedge funds37.13%
Public and others25.38%
Institutions21.72%
VC/PE firms13.14%
Individuals & Insiders2.64%

Major Shareholders

Major Shareholders Latest
Shareholder
EcoR1 Capital, LLC	15.46%	1.55M	14.29%	+1.45M	06/30/2026
Panacea Venture Management Co., Ltd.	13.14%	1.32M	6.04%	-313.45K	05/11/2026
Adiumentum Capital Management	12.05%	1.21M	2.16%	+0	06/09/2026
Adage Capital Management, L.P.	8.47%	850.00K	0.24%	+150.00K	06/30/2026
Point72 Asset Management, L.P.	6.85%	687.72K	4.57%	+493.45K	06/30/2026
Redmile Group, LLC	6.34%	636.85K	1.67%	+195.15K	07/22/2026
Vanguard Capital Management, LLC	2.89%	290.08K	0.06%	+38.60K	06/30/2026
Mackenzie Financial Corporation	2.32%	233.25K	1.36%	-80.37K	06/30/2026
BlackRock, Inc.	0.84%	84.46K	0.09%	+5.43K	06/30/2026
Geode Capital Management, LLC	0.75%	75.13K	0.03%	+8.98K	06/30/2026
Staley Capital Advisers, Inc.	0.50%	50.00K	0.09%	+0	06/30/2026
Anhco NguyenPresident, CEO & Director	0.42%	41.95K	0.07%	+8.83K	08/17/2026
Acadian Asset Management LLC	0.39%	38.85K	1.15%	-92.07K	06/30/2026
Pascal TouchonFormer Chairman of the Board	0.38%	38.39K	0.07%	+0	06/10/2025
Brian CherryIndependent Director	0.38%	38.32K	--	+38.32K	06/11/2026
Jane Street Group, LLC	0.30%	30.35K	0.10%	-3.53K	06/30/2026
State Street Investment Management	0.26%	26.45K	0.05%	+0	06/30/2026
Carol GallagherFormer Independent Director	0.25%	25.18K	0.04%	+0	03/10/2026
Canada Life Investment Management Ltd.	0.22%	22.19K	0.04%	+0	09/30/2025
William HeidenIndependent Director	0.22%	22.19K	0.05%	+7.83K	06/09/2026