Atara Biotherapeutics, Inc. - ATRA

Detailed investor-level table based on 13F positions.
Early Q1 2026 data: only 4 institutional holders reported so far. The full shareholder list will grow as more funds file with the SEC.

Shareholders (13F)

Quarter: Q4 2025 · Compare: Q3 2025
13D/13G major owners: Ownership tab.
Methodology: Market value and % of portfolio use SEC reported VALUE ($000). For PUT/CALL positions this reflects reported underlying exposure, not premium cash paid/received. Details.
Rows: 0
Investor History Status Shares held Market value ($000) % of portfolio Previous % Rank Change in shares % change in shares Source Date reported
EcoR1 Capital, LLC History No change 573,183 10,368 0.47% 0.39% 1 0 0.0% Q4 2025 Feb 17, 2026
Redmile Group, LLC History No change 441,701 7,990 0.59% 0.62% 2 0 0.0% Q4 2025 Feb 17, 2026
VANGUARD GROUP INC History Added to 225,940 4,087 0.0% 0.0% 3 +22,502 11.06% Q4 2025 Jan 29, 2026
MARSHALL WACE, LLP History Added to 148,632 2,688 0.0% 0.0% 4 +32,836 28.36% Q4 2025 Feb 13, 2026
GLOBEFLEX CAPITAL L P History Added to 77,224 1,396 0.21% 0.03% 5 +61,766 399.57% Q4 2025 Feb 11, 2026
BlackRock, Inc. History Reduced 67,108 1,213 0.0% 0.0% 6 -2,725 -3.9% Q4 2025 Feb 12, 2026
GEODE CAPITAL MANAGEMENT, LLC History Added to 62,381 1,129 0.0% 0.0% 7 +1,855 3.06% Q4 2025 Feb 09, 2026
MACKENZIE FINANCIAL CORP History Reduced 58,668 1,046 0.0% 0.0% 8 -5,148 -8.07% Q4 2025 Feb 18, 2026
ACADIAN ASSET MANAGEMENT LLC History Reduced 54,048 976 0.0% 0.0% 9 -2,368 -4.2% Q4 2025 Feb 10, 2026
STALEY CAPITAL ADVISERS INC History No change 50,000 904 0.04% 0.03% 10 0 0.0% Q4 2025 Feb 05, 2026
BRIDGEWAY CAPITAL MANAGEMENT, LLC History Added to 32,691 591 0.01% 0.0% 11 +18,691 133.51% Q4 2025 Feb 17, 2026
RENAISSANCE TECHNOLOGIES LLC History Added to 30,040 543 0.0% 0.0% 12 +11,104 58.64% Q4 2025 Feb 12, 2026
STATE STREET CORP History Added to 26,453 478 0.0% 0.0% 13 +1,200 4.75% Q4 2025 Feb 13, 2026
Cambridge Investment Research Advisors, Inc. History Added to 22,864 414 0.0% 0.0% 14 +5,755 33.64% Q4 2025 Feb 05, 2026
Quadrature Capital Ltd History Added to 20,321 367 0.0% 0.0% 15 +3,779 22.84% Q4 2025 Feb 17, 2026
Point72 Asset Management, L.P. History New 18,296 330 0.0% 16 +18,296 New Q4 2025 Feb 17, 2026
FMR LLC History No change 17,156 310 0.0% 0.0% 17 0 0.0% Q4 2025 Feb 17, 2026
MORGAN STANLEY History Reduced 15,991 289 0.0% 0.0% 18 -19,947 -55.5% Q4 2025 Feb 13, 2026
CITADEL ADVISORS LLC History New 15,577 281 0.0% 19 +15,577 New Q4 2025 Feb 17, 2026
SUSQUEHANNA INTERNATIONAL GROUP, LLP History New 14,018 253 0.0% 20 +14,018 New Q4 2025 Feb 17, 2026
JANE STREET GROUP, LLC History Reduced 13,990 253 0.0% 0.0% 21 -8,070 -36.58% Q4 2025 Feb 12, 2026
NORTHERN TRUST CORP History Added to 12,340 223 0.0% 0.0% 22 +1,307 11.85% Q4 2025 Feb 17, 2026
Walleye Capital LLC History New 12,169 220 0.0% 23 +12,169 New Q4 2025 Feb 13, 2026
Connor, Clark & Lunn Investment Management Ltd. History New 10,446 188 0.0% 24 +10,446 New Q4 2025 Feb 10, 2026
BANK OF AMERICA CORP /DE/ History Added to 10,387 187 0.0% 0.0% 25 +4,542 77.71% Q4 2025 Feb 17, 2026
DIMENSIONAL FUND ADVISORS LP History New 10,028 181 0.0% 26 +10,028 New Q4 2025 Feb 12, 2026
Tower Research Capital LLC (TRC) History Added to 1,737 31 0.0% 0.0% 27 +1,395 407.89% Q4 2025 Feb 17, 2026
UBS Group AG History Reduced 1,397 25 0.0% 0.0% 28 -15,871 -91.91% Q4 2025 Jan 29, 2026
SBI Securities Co., Ltd. History No change 1,404 25 0.0% 0.0% 29 0 0.0% Q4 2025 Feb 03, 2026
Private Wealth Asset Management, LLC History No change 900 16 0.0% 0.0% 30 0 0.0% Q4 2025 Feb 10, 2026
ROYAL BANK OF CANADA History New 850 15 0.0% 31 +850 New Q4 2025 Feb 17, 2026
JONES FINANCIAL COMPANIES LLLP History No change 703 12 0.0% 0.0% 32 0 0.0% Q4 2025 Feb 17, 2026
WELLS FARGO & COMPANY/MN History No change 251 4 0.0% 0.0% 33 0 0.0% Q4 2025 Feb 13, 2026
JPMORGAN CHASE & CO History No change 216 3 0.0% 0.0% 34 0 0.0% Q4 2025 Feb 11, 2026
RHUMBLINE ADVISERS History No change 175 3 0.0% 0.0% 35 0 0.0% Q4 2025 Feb 13, 2026
Raiffeisen Bank International AG History No change 200 3 0.0% 0.0% 36 0 0.0% Q4 2025 Feb 12, 2026
Banque Transatlantique SA History No change 176 3 0.0% 0.0% 37 0 0.0% Q4 2025 Feb 26, 2026
FEDERATED HERMES, INC. History New 130 2 0.0% 38 +130 New Q4 2025 Feb 12, 2026
GSA CAPITAL PARTNERS LLP History Closed out 0 0 0.03% -26,213 -100.0% Q3 2025 Nov 07, 2025
GROUP ONE TRADING LLC History Closed out 0 0 0.0% -148 -100.0% Q3 2025 Nov 12, 2025
Alexis Investment Partners, LLC History Closed out 0 0 -15 -100.0% Q3 2025 Nov 14, 2025
BNP PARIBAS FINANCIAL MARKETS History Reduced 46 0 -4 -8.0% Q4 2025 Feb 10, 2026
OSAIC HOLDINGS, INC. History No change 10 0 0 0.0% Q4 2025 Feb 17, 2026
Rockefeller Capital Management L.P. History No change 8 0 0 0.0% Q4 2025 Mar 16, 2026
KERR FINANCIAL PLANNING Corp History No change 24 0 0 0.0% Q4 2025 Feb 10, 2026