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ATRA · Atara Biotherapeutics, Inc. · Shareholders & Ownership

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$8.96 -0.22 (-2.40%) At close · Oct 19
Rebalance outlook locked
Going-concern doubt — flagged Aug 12, 2026

Substantial doubt about the company's ability to continue as a going concern.

“Our existing cash, cash equivalents and short-term investments as of June 30, 2026 will not be sufficient to fund our planned operations for at least the next twelve months from the date of issuance of these financial statements. These conditions raise substantial doubt about our ability to continue as a going concern for at least 12 months after the issuance of the accompanying condensed consolidated financial statements.”
View the 10-Q filed Aug 12, 2026
Market Cap
$92.75M
Shares
10.04M
Volume · Oct 19 12.46K Avg daily vol (3M) 46.52K

Every disclosed holder of ATRA in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

How the holder list picks a filing →

Who Owns ATRA

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions
Holder group Shares % Out
Institutional (13F) 4,467,983 44.51%
Insiders (Forms 3, 4, 5) 3,372,130 33.59%
13D/G-only blocks 0 0.00%
Remaining 2,197,597 21.89%
Registered funds (N-PORT, not summed) 350,811 3.49%

Shares outstanding: 10,037,710, the issuer's latest cover-page count restated onto today's split basis.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of ATRA

One row per holder Every filing By ultimate parent
All 13F Funds Insiders 13D/G Non-US
# Holder Shares
1
EcoR1 Capital, LLC
13F CIK 1587114 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
 1,552,000
1.1
EcoR1 Capital, LLC
Insider CIK 1587114 · May 7, 2026
Director, 10% Owner, issuer-wide, not summed
 1,552,000
2
Ciongoli Gregory Austin
Insider CIK 2023732 · Jun 9, 2026
Director, issuer-wide
 1,221,395
3
Adiumentum Capital Fund I LP
Insider CIK 2023734 · May 16, 2025
Director, 10% Owner, issuer-wide
 1,209,395
3.1
Adiumentum Capital Fund I LP
13D CIK 2023734 · May 14, 2025
not summed
 1,370,081
4
Redmile Group, LLC
13D CIK 1425738 · Registered investment adviser · Jul 22, 2026
not summed
 950,994
4.1
Redmile Group, LLC
Insider CIK 1425738 · Jul 22, 2026
10% Owner, issuer-wide, not summed
 636,852
4.2
Redmile Group, LLC
13F CIK 1425738 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
 441,701
5
ADAGE CAPITAL PARTNERS GP, L.L.C.
13F CIK 1165408 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
 850,000
6
Point72 Asset Management, L.P.
13F CIK 1603466 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
 687,718
6.1
Point72 Asset Management, L.P.
13G CIK 1603466 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(c), passive investor, not summed
 687,718
7
Panacea Innovation Ltd
Insider CIK 2010692 · May 7, 2026
10% Owner, issuer-wide
 307,894
7.1
Panacea Venture Healthcare Fund II, L.P.
13D CIK 2010692 · Unknown · May 16, 2025
not summed
 1,638,565
8
VANGUARD CAPITAL MANAGEMENT LLC
13F CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
 247,047
9
MACKENZIE FINANCIAL CORP
13F CIK 919859 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
 233,249
10
Cherry Brian N
Insider CIK 1290922 · Sep 4, 2026
Director, issuer-wide
 166,486
11
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
 158,646
12
Nguyen AnhCo
Insider CIK 1977970 · Aug 17, 2026
Director, President and CEO, issuer-wide
 132,775
13
BlackRock, Inc.
13F CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
 84,455
13.1
iShares Micro-Cap ETF
Fund S000004439 · Registered fund · Jun 30, 2026
iShares Trust, not summed
 17,227
14
VANGUARD EXTENDED MARKET INDEX FUND
Fund S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
 82,758
15
Touchon Pascal
Insider CIK 1780060 · Jun 10, 2025
Director, issuer-wide
 77,955
16
GEODE CAPITAL MANAGEMENT, LLC
13F CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
 75,128
17
Hyllengren Eric J
Insider CIK 1966926 · Mar 3, 2025
Chief Financial Officer, issuer-wide
 56,231
18
STALEY CAPITAL ADVISERS INC
13F CIK 1106565 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
 50,000
19
Grant-Huerta Yanina
Insider CIK 2064348 · May 18, 2026
Chief Accounting Officer, issuer-wide
 49,636
20
VANGUARD FIDUCIARY TRUST CO
13F CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
 43,036
21
ACADIAN ASSET MANAGEMENT LLC
13F CIK 916542 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
 38,845
22
HEIDEN WILLIAM K
Insider CIK 1214939 · Jun 9, 2026
Director, issuer-wide
 34,188
23
Gallagher Carol Giltner
Insider CIK 1329959 · Jun 10, 2025
Director, issuer-wide
 33,012
24
JANE STREET GROUP, LLC
13F CIK 1595888 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
 30,345
25
Fust Matthew K
Insider CIK 1397266 · Jun 9, 2026
Director, issuer-wide
 30,188
26
STATE STREET CORP
13F CIK 93751 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
 26,453
27
Henrich Jill
Insider CIK 1978096 · Mar 3, 2025
EVP, Chief Regulatory Officer, issuer-wide
 18,679
28
Roncarolo Maria Grazia
Insider CIK 1811671 · Jun 10, 2025
Director, issuer-wide
 17,368
29
MALLIK AMEET
Insider CIK 1861441 · Jun 10, 2025
Director, Chief Executive Officer, issuer-wide
 16,928
30
NORTHERN TRUST CORP
13F CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
 16,591
31
FMR LLC
13F CIK 315066 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
 16,238
31.1
Fidelity Extended Market Index Fund
Fund S000006021 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
 29,408
31.2
VIP Disciplined Small Cap Portfolio
Fund S000007725 · Registered fund · Jun 30, 2026
Variable Insurance Products Fund II, not summed
 16,238
31.3
Fidelity Total Market Index Fund
Fund S000006026 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
 10,479
31.4
Fidelity Series Total Market Index Fund
Fund S000065248 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
 8,665
31.5
Fidelity Nasdaq Composite Index Fund
Fund S000055366 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
 4,612
32
XTX Topco Ltd
13F CIK 1828301 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
 15,303
33
BRIDGEWAY CAPITAL MANAGEMENT, LLC
13F CIK 1107261 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
 14,000
34
Ultra-Small Company Market Fund
Fund S000004424 · Registered fund · Jun 30, 2026
Bridgeway Funds, Inc., not summed
 14,000
35
MILLENNIUM MANAGEMENT LLC
13F CIK 1273087 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
 12,680
36
CITADEL ADVISORS LLC
13F CIK 1423053 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
 10,159
37
MORGAN STANLEY
13F CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
 9,178
38
ROYAL BANK OF CANADA
13F CIK 1000275 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
 4,743
39
UBS Group AG
13F CIK 1610520 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
 3,979
40
VANGUARD INSTITUTIONAL TOTAL STOCK MARKET INDEX FUND
Fund S000002855 · Registered fund · Jun 30, 2026
VANGUARD INSTITUTIONAL INDEX FUNDS, not summed
 2,844
41
VANGUARD BALANCED INDEX FUND
Fund S000002560 · Registered fund · Jun 30, 2026
VANGUARD VALLEY FORGE FUNDS, not summed
 2,799
42
Schwab Total Stock Market Index Fund
Fund S000005913 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
 1,643
43
Vanguard Global Advisers, LLC
13F CIK 1811242 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
 1,456
44
SBI Securities Co., Ltd.
13F CIK 1851815 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
 1,404
45
1290 VT Micro Cap Portfolio
Fund S000044688 · Registered fund · Jun 30, 2026
EQ Advisors Trust, not summed
 1,147
46
JONES FINANCIAL COMPANIES LLLP
13F CIK 815917 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
 803
47
Caitong International Asset Management Co., Ltd
13F CIK 1963355 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
 311
48
BARCLAYS PLC
13F CIK 312069 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
 304
49
WELLS FARGO & COMPANY/MN
13F CIK 72971 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
 251
50
JPMORGAN CHASE & CO
13F CIK 19617 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
 216

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 60 holders

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Key facts CIK 1604464 CUSIP 046513206 13F (30d) 2 filings 2 filers Visit website Investor relations