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Atara Biotherapeutics, Inc.

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Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.

Atara Biotherapeutics, Inc.

CIK 0001604464ATRA· quarter ending 2026-06-30
Shares outstanding
10,037,710
as of 2026-08-10 · 10-Q cover page, filed 2026-08-12
Held by 13F filers
4,467,954
44.5% of shares outstanding
Holders
35
+3 vs 2026-03-31 · 4 new, 1 exited
Value
$51.3M
shares +74.2% vs prior quarter

Share classes (cover page of the 10-Q filed 2026-08-12, as of 2026-08-10)

ClassListedShares outstandingHeld by 13F filers% of classHoldersCUSIP
Common stockATRA · NASDAQ10,037,7104,467,95444.5%35046513206

Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.

Securities (CUSIPs held in 13F this quarter)

tick to combine
CountCUSIPClass (as filers write it)HoldersShares heldClass shares% of classValueOptionsMapped via
046513206COM NEW354,467,95410,037,71044.5%$51.3M1 call / 0 put13DGholders →
046513107Stocknot common128——$321—13DGholders →

Totals combine the ticked CUSIPs and update as you tick: common-stock classes by default; preferreds, notes, warrants and depositary shares are listed but not counted. "holders →" shows a single CUSIP on its own. Bonds are held as a principal amount, not shares. Options positions are never counted as holdings.

Top holders (35 of 35 · 046513206)

change vs 2026-03-31
#FilerShares% of classValueChange
1EcoR1 Capital, LLC1,552,00015.46%$17.8M+1,452,407 (+1458.3%)
2ADAGE CAPITAL PARTNERS GP, L.L.C.850,0008.47%$9.8M+150,000 (+21.4%)
3Point72 Asset Management, L.P.687,7186.85%$7.9M+493,454 (+254.0%)
4Redmile Group, LLC441,7014.40%$5.1M—
5VANGUARD CAPITAL MANAGEMENT LLC247,0472.46%$2.8M+29,185 (+13.4%)
6MACKENZIE FINANCIAL CORP233,2492.32%$2.7M-80,371 (-25.6%)
7BlackRock, Inc.84,4550.84%$970K+5,433 (+6.9%)
8GEODE CAPITAL MANAGEMENT, LLC75,1280.75%$863K+8,982 (+13.6%)
9STALEY CAPITAL ADVISERS INC50,0000.50%$574K—
10VANGUARD FIDUCIARY TRUST CO43,0360.43%$494K+9,415 (+28.0%)
11ACADIAN ASSET MANAGEMENT LLC38,8450.39%$444K-92,065 (-70.3%)
12JANE STREET GROUP, LLC30,3450.30%$348K-3,525 (-10.4%)
13STATE STREET CORP26,4530.26%$304K—
14NORTHERN TRUST CORP16,5910.17%$190K+4,251 (+34.4%)
15FMR LLC16,2380.16%$186K—
16XTX Topco Ltd15,3030.15%$176KNEW
17BRIDGEWAY CAPITAL MANAGEMENT, LLC14,0000.14%$161K-18,691 (-57.2%)
18MILLENNIUM MANAGEMENT LLC12,6800.13%$146K-35,009 (-73.4%)
19CITADEL ADVISORS LLC10,1590.10%$117KNEW
20MORGAN STANLEY9,1780.09%$105K+9 (+0.1%)
21ROYAL BANK OF CANADA4,7430.05%$55K+424 (+9.8%)
22UBS Group AG3,9790.04%$46K-46,091 (-92.1%)
23Vanguard Global Advisers, LLC1,4560.01%$17K—
24SBI Securities Co., Ltd.1,4040.01%$16K-170 (-10.8%)
25JONES FINANCIAL COMPANIES LLLP8030.01%$8K+100 (+14.2%)
26Caitong International Asset Management Co., Ltd3110.00%$4KNEW
27BARCLAYS PLC3040.00%$3KNEW
28WELLS FARGO & COMPANY/MN2510.00%$3K—
29JPMORGAN CHASE & CO2160.00%$2K—
30Banque Transatlantique SA1760.00%$3K—
31CITIGROUP INC970.00%$1K+96 (+9600.0%)
32BNP PARIBAS FINANCIAL MARKETS460.00%$528-12 (-20.7%)
33KERR FINANCIAL PLANNING Corp240.00%$276—
34OSAIC HOLDINGS, INC.100.00%$114—
35Rockefeller Capital Management L.P.80.00%$92—
Exited since 2026-03-31 (1 filers; largest 1 shown)
RHUMBLINE ADVISERS−175

Large holders from 13D/13G (latest per reporting person, last 2 years)

Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.

Reporting personFormFiledEventShares% of class
Steven A. CohenSCHEDULE 13G/A2026-08-142026-06-30687,7187.6%
Point72 Capital Advisors, Inc.SCHEDULE 13G/A2026-08-142026-06-30687,7187.6%
Point72 Asset Management, L.P.SCHEDULE 13G/A2026-08-142026-06-30687,7187.6%
Redmile Biopharma Investments II, L.P.SCHEDULE 13D/A2026-07-242026-07-22631,0206.6%
Green JeremySCHEDULE 13D/A2026-07-242026-07-22950,9949.9%
Redmile Strategic Long Only Trading Sub, Ltd.SCHEDULE 13D/A2026-07-242026-07-22401,9014.2%
Redmile Group, LLCSCHEDULE 13D/A2026-07-242026-07-22950,9949.9%
Jeremy C. GreenSCHEDULE 13D/A2026-05-142026-05-12950,9949.9%
Phillip GrossSCHEDULE 13G2026-05-132026-03-31700,0008.56%
Adage Capital Management, L.P.SCHEDULE 13G2026-05-132026-03-31700,0008.56%
Robert AtchinsonSCHEDULE 13G2026-05-132026-03-31700,0008.56%
Panacea Innovation LimitedSCHEDULE 13D/A2026-05-112026-05-071,318,89416.1%
Panacea Opportunity Fund I GP Company, Ltd.SCHEDULE 13D/A2026-05-112026-05-07307,8993.8%
Panacea Opportunity Fund I, L.P.SCHEDULE 13D/A2026-05-112026-05-07307,8993.8%
Panacea Venture Healthcare Fund II GP Company, Ltd.SCHEDULE 13D/A2026-05-112026-05-071,011,00012.4%
Panacea Venture Healthcare Fund II, L.P.SCHEDULE 13D/A2026-05-112026-05-071,011,00012.4%
James HuangSCHEDULE 13D/A2026-05-112026-05-071,318,89416.1%
Oleg NodelmanSCHEDULE 13G/A2026-05-072026-05-071,552,00017.4%
EcoR1 Capital, LLCSCHEDULE 13G/A2026-05-072026-05-071,552,00017.4%
EcoR1 Capital Fund Qualified, L.P.SCHEDULE 13G/A2026-05-072026-05-071,445,60916.2%
RedCo I, L.P.SCHEDULE 13D/A2025-11-142025-11-12347,4424.7%
Gregory A. CiongoliSCHEDULE 13D/A2025-05-162025-05-141,370,08119.99%
Adiumentum Capital Fund I LPSCHEDULE 13D/A2025-05-162025-05-141,370,08119.99%
Adiumentum Capital Fund I GP LLCSCHEDULE 13D/A2025-05-162025-05-141,370,08119.99%

Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.