ATRA — Atara Biotherapeutics Inc Institutional Holders · Q2 2026

Name: Who Owns ATRA? 36 Institutions Hold $51.3M (Q2 2026)
Creator: ko.io

Who owns Atara Biotherapeutics Inc (ATRA)? 36 institutions reported holding $51.29M in SEC 13F filings for Q2 2026 (period ended 2026-06-30). Largest holders: EcoR1 Capital, LLC ($17.8M), Adage Capital Partners Gp, L.L.C. ($9.8M), Point72 Asset Management, L.P. ($7.9M).

Rank	Institution	Value	Shares	Change
1	EcoR1 Capital, LLC	$17.8M	1.6M	Added
2	ADAGE CAPITAL PARTNERS GP, L.L.C.	$9.8M	850,000	Added
3	Point72 Asset Management, L.P.	$7.9M	687,718	Added
4	Redmile Group, LLC	$5.1M	441,701	Hold
5	VANGUARD GROUP INC	$3.3M	291,539	Added
6	MACKENZIE FINANCIAL CORP	$2.7M	233,249	Trimmed
7	BlackRock, Inc.	$969,544	84,455	Added
8	GEODE CAPITAL MANAGEMENT, LLC	$862,924	75,128	Added
9	STALEY CAPITAL ADVISERS INC	$574,000	50,000	Hold
10	ACADIAN ASSET MANAGEMENT LLC	$444,000	38,845	Trimmed
11	JANE STREET GROUP, LLC	$348,360	30,345	Trimmed
12	STATE STREET CORP	$303,680	26,453	Hold
13	NORTHERN TRUST CORP	$190,465	16,591	Added
14	FMR LLC	$186,412	16,238	Hold
15	XTX Topco Ltd	$175,678	15,303	New
16	BRIDGEWAY CAPITAL MANAGEMENT, LLC	$160,720	14,000	Trimmed
17	MILLENNIUM MANAGEMENT LLC	$145,566	12,680	Trimmed
18	CITADEL ADVISORS LLC	$116,625	10,159	New
19	MORGAN STANLEY	$105,368	9,178	Added
20	Royal Bank of Canada	$55,000	4,743	Added
21	UBS Group AG	$45,679	3,979	Trimmed
22	SBI Securities Co., Ltd.	$16,118	1,404	Trimmed
23	JONES FINANCIAL COMPANIES LLLP	$8,440	803	Added
24	Caitong International Asset Management Co., Ltd	$3,570	311	New
25	BARCLAYS PLC	$3,490	304	New

Source: SEC Form 13F filings · as of 2026-06-30