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Disclosery

ATRA ATARA BIOTHERAPEUTICS INC

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COM NEW (common), issuer CIK 1604464

30 managers (32 13F filers) reported a position in ATRA shares at 2026-03-31, 2,564,230 shares in all. 3 filers opened a position and 14 filers sold out during the quarter.

Managers
30
13F filers
32
New
3
Added
10
Reduced
3
Sold out
14
Shares held by filers
2,564,230

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
ADAGE CAPITAL PARTNERS GP, L.L.C.in group ADAGE CAPITAL PARTNERS GP, L.…700,000$3.31M0.01%new13F-HRTimelineGroup
Redmile Group, LLCin group Redmile Group, LLC441,701$2.09M0.14%013F-HRTimelineGroup
MACKENZIE FINANCIAL CORP313,620$1.48M<0.01%+254,95213F-HRTimeline
VANGUARD GROUP INCgroup of 3 filers holding252,939$1.2MnewTimeline
Point72 Asset Management, L.P.in group Point72 Asset Management, L.P.194,264$919K<0.01%+175,96813F-HRTimelineGroup
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC130,910$617K<0.01%+76,86213F-HRTimelineGroup
EcoR1 Capital, LLC99,593$471K0.02%-473,59013F-HRTimeline
BlackRock, Inc.in group BlackRock, Inc.79,022$374K<0.01%+11,91413F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC66,146$313K<0.01%+3,76513F-HRTimelineGroup
UBS Group AGin group UBS Group AG50,070$237K<0.01%+48,67313F-HRTimelineGroup
STALEY CAPITAL ADVISERS INC50,000$236K0.01%013F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC47,689$226K<0.01%new13F-HRTimelineGroup
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC33,870$160K<0.01%+19,88013F-HRTimelineGroup
BRIDGEWAY CAPITAL MANAGEMENT, LLC32,691$155K<0.01%013F-HRTimeline
STATE STREET CORPin group STATE STREET CORP26,453$125K<0.01%013F-HRTimelineGroup
FMR LLCin group FMR LLC16,238$76.8K<0.01%-91813F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP12,340$58.4K<0.01%013F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY9,169$43.4K<0.01%-6,82213F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA4,319$20K<0.01%+3,46913F-HRTimelineGroup
SBI Securities Co., Ltd.1,574$7.45K<0.01%+17013F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP703$3.23K<0.01%013F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN251$1.19K<0.01%013F-HR/ATimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO216$933<0.01%013F-HR/ATimelineGroup
Banque Transatlantique SAin group Banque Transatlantique SA176$906<0.01%013F-HRTimelineGroup
RHUMBLINE ADVISERS175$827<0.01%013F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS58$274<0.01%+1213F-HRTimelineGroup
KERR FINANCIAL PLANNING Corp24$116<0.01%013F-HR/ATimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.10$47<0.01%013F-HRTimelineGroup
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…8$38<0.01%013F-HRTimelineGroup
CITIGROUP INCin group CITIGROUP INC1$5<0.01%new13F-HRTimelineGroup