Stock

Atara Biotherapeutics, Inc.

ATRA · held by 41 managers

Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025

Reported value

$35.7M

Holders

+0 new · −0 exited

Holders’ est. mark

$82.1K

Price effect on 2 books still in the name

Largest holder

$10.4M

EcoR1 Capital, LLC

Notable conviction

Share of each notable manager’s 13F book.

Renaissance Technologies0.0% · $543.4K
Citadel0.0% · $281.8K
Fidelity0.0% · $310.4K
State Street0.0% · $478.5K
Vanguard0.0% · $4.09M

Holder count by quarter

Q4 2022 Q1 2023 Q2 2023 Q3 2023 Q4 2023 Q1 2024 Q1 2025 Q3 2025 Q4 2025 Q1 2026

Who holds it

Notable only

Investor	Shares	Value	Est. mark	Change
EcoR1 Capital, LLC	573.2K	$10.4M	—	Held
Redmile Group, LLC	441.7K	$7.99M	—	Held
Vanguard	225.9K	$4.09M	—	Held
MARSHALL WACE, LLP	148.6K	$2.69M	—	Held
GLOBEFLEX CAPITAL L P	77.2K	$1.4M	—	Held
BlackRock, Inc.	67.1K	$1.21M	—	Held
GEODE CAPITAL MANAGEMENT, LLC	62.4K	$1.13M	—	Held
MACKENZIE FINANCIAL CORP	58.7K	$1.05M	—	Held
STALEY CAPITAL ADVISERS INC	50K	$904.5K	—	Held
BRIDGEWAY CAPITAL MANAGEMENT, LLC	32.7K	$591.4K	—	Held
Renaissance Technologies	30K	$543.4K	—	Held
State Street	26.5K	$478.5K	—	Held
Quadrature Capital Ltd	20.3K	$367.6K	—	Held
Point72 Asset Management, L.P.	18.3K	$331K	—	Held
Fidelity	17.2K	$310.4K	—	Held
MORGAN STANLEY	16K	$289.3K	$60.1K	Cut−$225.7K
Citadel	15.6K	$281.8K	—	Held
SUSQUEHANNA INTERNATIONAL GROUP, LLP	14K	$253.6K	—	Held
JANE STREET GROUP, LLC	14K	$253.1K	—	Held
NORTHERN TRUST CORP	12.3K	$223.2K	—	Held
Walleye Capital LLC	12.2K	$220.1K	—	Held
Connor, Clark & Lunn Investment Management Ltd.	10.4K	$189K	—	Held
BANK OF AMERICA CORP /DE/	10.4K	$187.9K	$22K	Added$104.1K
DIMENSIONAL FUND ADVISORS LP	10K	$181.4K	—	Held
Tower Research Capital LLC (TRC)	1.74K	$31.4K	—	Held
SBI Securities Co., Ltd.	1.4K	$25.4K	—	Held
UBS Group AG	1.4K	$25.3K	—	Held
Private Wealth Asset Management, LLC	900	$16.3K	—	Held
ROYAL BANK OF CANADA	850	$15K	—	Held
JONES FINANCIAL COMPANIES LLLP	703	$12.7K	—	Held
WELLS FARGO & COMPANY/MN	251	$4.54K	—	Held
JPMORGAN CHASE & CO	216	$3.91K	—	Held
Banque Transatlantique SA	176	$3.18K	—	Held
RHUMBLINE ADVISERS	175	$3.17K	—	Held
FEDERATED HERMES, INC.	130	$2.35K	—	Held
ACADIAN ASSET MANAGEMENT LLC	54K	$976	—	Held
BNP PARIBAS FINANCIAL MARKETS	46	$832	—	Held
Cambridge Investment Research Advisors, Inc.	22.9K	$414	—	Held
OSAIC HOLDINGS, INC.	10	$180	—	Held
Rockefeller Capital Management L.P.	8	$145	—	Held
KERR FINANCIAL PLANNING Corp	24	$112	—	Held

Positions as of Q4 2025. 13F filings arrive up to 45 days after quarter-end and omit shorts. Values are quarter-end marks, as filed. Estimated mark is the price effect on shares still held — not realized P&L or investment advice.