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Disclosery

ATRA ATARA BIOTHERAPEUTICS INC

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COM NEW (common), issuer CIK 1604464

33 managers (35 13F filers) reported a position in ATRA shares at 2026-06-30, 4,467,954 shares in all. 4 filers opened a position and 1 filer sold out during the quarter.

Managers
33
13F filers
35
New
4
Added
12
Reduced
8
Sold out
1
Shares held by filers
4,467,954

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, Q2 2026

Filers in the available 13F reports with a share position at 2026-06-30, 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
EcoR1 Capital, LLC1,552,000$17.8M0.88%+1,452,40713F-HRTimeline
ADAGE CAPITAL PARTNERS GP, L.L.C.in group ADAGE CAPITAL PARTNERS GP, L.…850,000$9.76M0.01%+150,00013F-HRTimelineGroup
Point72 Asset Management, L.P.in group Point72 Asset Management, L.P.687,718$7.9M0.01%+493,45413F-HRTimelineGroup
Redmile Group, LLCin group Redmile Group, LLC441,701$5.07M0.34%013F-HRTimelineGroup
VANGUARD GROUP INCgroup of 3 filers holding291,539$3.35M+38,600Timeline
MACKENZIE FINANCIAL CORP233,249$2.68M<0.01%-80,37113F-HRTimeline
BlackRock, Inc.in group BlackRock, Inc.84,455$970K<0.01%+5,43313F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC75,128$863K<0.01%+8,98213F-HRTimelineGroup
STALEY CAPITAL ADVISERS INC50,000$574K0.02%013F-HRTimeline
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC38,845$444K<0.01%-92,06513F-HRTimelineGroup
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC30,345$348K<0.01%-3,52513F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP26,453$304K<0.01%013F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP16,591$190K<0.01%+4,25113F-HRTimelineGroup
FMR LLCin group FMR LLC16,238$186K<0.01%013F-HRTimelineGroup
XTX Topco Ltdin group XTX Topco Ltd15,303$176K<0.01%new13F-HRTimelineGroup
BRIDGEWAY CAPITAL MANAGEMENT, LLC14,000$161K<0.01%-18,69113F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC12,680$146K<0.01%-35,00913F-HRTimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC10,159$117K<0.01%new13F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY9,178$105K<0.01%+913F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA4,743$55K<0.01%+42413F-HRTimelineGroup
UBS Group AGin group UBS Group AG3,979$45.7K<0.01%-46,09113F-HRTimelineGroup
SBI Securities Co., Ltd.1,404$16.1K<0.01%-17013F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP803$8.44K<0.01%+10013F-HRTimelineGroup
Caitong International Asset Management …311$3.57K<0.01%new13F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC304$3.49K<0.01%new13F-HRTimelineGroup
Banque Transatlantique SAin group Banque Transatlantique SA176$3.1K<0.01%013F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN251$2.88K<0.01%013F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO216$2.41K<0.01%013F-HRTimelineGroup
CITIGROUP INCin group CITIGROUP INC97$1.11K<0.01%+9613F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS46$528<0.01%-1213F-HRTimelineGroup
KERR FINANCIAL PLANNING Corp24$276<0.01%013F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.10$114<0.01%013F-HRTimelineGroup
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…8$92<0.01%013F-HRTimelineGroup