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Atara Biotherapeutics Inc (ATRA)

CUSIP: 046513206 | NYSE | Healthcare · Biotechnology | Micro Cap | 77 institutional holders

Quarters

Q3 2026Q2 2026Q1 2026Q4 2025Q3 2025
CompareDetailedHistoricalFundsOptions13D/13GPeersTargetingTrading SummaryProfile

Beneficial Ownership — 13D / 13G

Full history →

5%+ stakes reported outside the quarterly cycle. A 13D is due within five business days of the event below, so these figures lead the holders table until the filer's next 13F catches up to them.

HolderShares% of ClassChangeEvent Datevs 13F
13D/ARedmile Group, LLC
with Redmile Biopharma Investments II, L.P., Redmile Strategic Long Only Trading Sub, Ltd.
950,9949.9%UnchangedJul 22, 2026441,701 sh (Jun 30, 2026)
13G/APoint72 Asset Management, L.P.

Institutional Holders — Q3 2026

MacKenzie Financial Corp176,758
0.0% of portfolio›$1.5M
Geode Capital Management, LLC80,950
0.0% of portfolio›$688.4K
Staley Capital Advisers Inc50,000
0.0% of portfolio›$425.0K
SBI Securities Co., Ltd.1,404
0.0% of portfolio›$11.9K
Caitong International Asset Management Co., Ltd266
0.0% of portfolio›$2.3K
Barclays PLC214
0.0% of portfolio›$1.8K
IFP Advisors, Inc1
0.0% of portfolio›$8
Citigroup Inc1
0.0% of portfolio›$9
StyleTurnoverLocationFiled
MacKenzie Financial Corp
176,758$1.5M0.0%CoreMediumToronto Ontario, Australia2026-11-02
Geode Capital Management, LLC
80,950$688.4K0.0%IndexVery LowBoston, MA2026-11-06
Staley Capital Advisers Inc
50,000$425.0K0.0%ValueLowPittsburgh, PA2026-11-06
SBI Securities Co., Ltd.
1,404$11.9K0.0%Agg GrowthLowTokyo, Mexico2026-10-22
Caitong International Asset Management Co., Ltd
266$2.3K0.0%GrowthVery HighHong Kong, South Korea2026-10-29
Barclays PLC
214$1.8K0.0%CoreMediumLondon, United Kingdom2026-11-06
IFP Advisors, Inc
1$80.0%GrowthLowTampa, FL2026-10-16
Citigroup Inc
1$90.0%CoreMediumNew York, NY2026-11-04
687,718
7.6%
New 5%+ stake
Jun 30, 2026
No 13F filer matched
13D/ARedmile Group, LLC950,994
9.9% of class · Jul 22, 2026Unchanged
with Redmile Biopharma Investments II, L.P., Redmile Strategic Long Only Trading Sub, Ltd.
441,701 sh (Jun 30, 2026)
13G/APoint72 Asset Management, L.P.687,718
7.6% of class · Jun 30, 2026New 5%+ stake
No 13F filer matched