Atara Biotherapeutics, Inc. - ATRA

Detailed investor-level table based on 13F positions.

Shareholders (13F)

Quarter: Q1 2026 · Compare: Q4 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
VANGUARD GROUP INC History No change 225,940 4,087 0.0% 0.0% 1 0 0.0% Q4 2025 Jan 29, 2026
ADAGE CAPITAL PARTNERS GP, L.L.C. History New 700,000 3,311 0.01% 2 +700,000 New Q1 2026 May 15, 2026
Redmile Group, LLC History No change 441,701 2,089 0.14% 0.59% 3 0 0.0% Q1 2026 May 15, 2026
MACKENZIE FINANCIAL CORP History Added to 313,620 1,483 0.0% 0.0% 4 +254,952 434.57% Q1 2026 May 13, 2026
VANGUARD CAPITAL MANAGEMENT LLC History New 217,862 1,030 0.0% 5 +217,862 New Q1 2026 May 15, 2026
Point72 Asset Management, L.P. History Added to 194,264 918 0.0% 0.0% 6 +175,968 961.78% Q1 2026 May 15, 2026
ACADIAN ASSET MANAGEMENT LLC History Added to 130,910 617 0.0% 0.0% 7 +76,862 142.21% Q1 2026 May 13, 2026
EcoR1 Capital, LLC History Reduced 99,593 471 0.02% 0.47% 8 -473,590 -82.62% Q1 2026 May 15, 2026
BlackRock, Inc. History Added to 79,022 373 0.0% 0.0% 9 +11,914 17.75% Q1 2026 May 13, 2026
GEODE CAPITAL MANAGEMENT, LLC History Added to 66,146 313 0.0% 0.0% 10 +3,765 6.04% Q1 2026 May 15, 2026
UBS Group AG History Added to 50,070 236 0.0% 0.0% 12 +48,673 3484.11% Q1 2026 May 05, 2026
STALEY CAPITAL ADVISERS INC History No change 50,000 236 0.01% 0.04% 11 0 0.0% Q1 2026 Apr 29, 2026
MILLENNIUM MANAGEMENT LLC History New 47,689 225 0.0% 13 +47,689 New Q1 2026 May 15, 2026
JANE STREET GROUP, LLC History Added to 33,870 160 0.0% 0.0% 14 +19,880 142.1% Q1 2026 May 12, 2026
VANGUARD FIDUCIARY TRUST CO History New 33,621 159 0.0% 15 +33,621 New Q1 2026 May 08, 2026
BRIDGEWAY CAPITAL MANAGEMENT, LLC History No change 32,691 154 0.0% 0.01% 16 0 0.0% Q1 2026 May 15, 2026
STATE STREET CORP History No change 26,453 125 0.0% 0.0% 17 0 0.0% Q1 2026 May 15, 2026
FMR LLC History Reduced 16,238 76 0.0% 0.0% 18 -918 -5.35% Q1 2026 May 15, 2026
NORTHERN TRUST CORP History No change 12,340 58 0.0% 0.0% 19 0 0.0% Q1 2026 May 14, 2026
MORGAN STANLEY History Reduced 9,169 43 0.0% 0.0% 20 -6,822 -42.66% Q1 2026 May 15, 2026
ROYAL BANK OF CANADA History Added to 4,319 20 0.0% 0.0% 21 +3,469 408.12% Q1 2026 May 15, 2026
SBI Securities Co., Ltd. History Added to 1,574 7 0.0% 0.0% 22 +170 12.11% Q1 2026 Apr 27, 2026
Vanguard Global Advisers, LLC History New 1,456 6 0.0% 23 +1,456 New Q1 2026 May 08, 2026
JONES FINANCIAL COMPANIES LLLP History No change 703 3 0.0% 0.0% 24 0 0.0% Q1 2026 May 15, 2026
WELLS FARGO & COMPANY/MN History No change 251 1 0.0% 0.0% 25 0 0.0% Q1 2026 May 11, 2026
MARSHALL WACE, LLP History Closed out 0 0 0.0% -148,632 -100.0% Q1 2026 May 14, 2026
GLOBEFLEX CAPITAL L P History Closed out 0 0 0.21% -77,224 -100.0% Q1 2026 May 13, 2026
RENAISSANCE TECHNOLOGIES LLC History Closed out 0 0 0.0% -30,040 -100.0% Q1 2026 May 14, 2026
Cambridge Investment Research Advisors, Inc. History Closed out 0 0 0.0% -22,864 -100.0% Q1 2026 Apr 30, 2026
Quadrature Capital Ltd History Closed out 0 0 0.0% -20,321 -100.0% Q1 2026 May 15, 2026
CITADEL ADVISORS LLC History Closed out 0 0 0.0% -15,577 -100.0% Q1 2026 May 15, 2026
SUSQUEHANNA INTERNATIONAL GROUP, LLP History Closed out 0 0 0.0% -14,018 -100.0% Q1 2026 May 15, 2026
Walleye Capital LLC History Closed out 0 0 0.0% -12,169 -100.0% Q1 2026 May 13, 2026
Connor, Clark & Lunn Investment Management Ltd. History Closed out 0 0 0.0% -10,446 -100.0% Q1 2026 May 11, 2026
BANK OF AMERICA CORP /DE/ History Closed out 0 0 0.0% -10,387 -100.0% Q1 2026 May 15, 2026
DIMENSIONAL FUND ADVISORS LP History Closed out 0 0 0.0% -10,028 -100.0% Q1 2026 May 07, 2026
Tower Research Capital LLC (TRC) History Closed out 0 0 0.0% -1,737 -100.0% Q1 2026 May 15, 2026
Private Wealth Asset Management, LLC History Closed out 0 0 0.0% -900 -100.0% Q1 2026 May 06, 2026
FEDERATED HERMES, INC. History Closed out 0 0 0.0% -130 -100.0% Q1 2026 May 11, 2026
PlanVest Financial, Inc History New 28 0 +28 New Q1 2026 May 14, 2026
BNP PARIBAS FINANCIAL MARKETS History Added to 58 0 +12 26.09% Q1 2026 May 12, 2026
CITIGROUP INC History New 1 0 +1 New Q1 2026 May 11, 2026
JPMORGAN CHASE & CO History No change 216 0 0.0% 0 0.0% Q1 2026 May 13, 2026
RHUMBLINE ADVISERS History No change 175 0 0.0% 0 0.0% Q1 2026 May 12, 2026
OSAIC HOLDINGS, INC. History No change 10 0 0 0.0% Q1 2026 May 15, 2026
Rockefeller Capital Management L.P. History No change 8 0 0 0.0% Q1 2026 May 14, 2026
Raiffeisen Bank International AG History No change 200 0 0.0% 0 0.0% Q1 2026 Apr 24, 2026
Banque Transatlantique SA History No change 176 0 0.0% 0 0.0% Q1 2026 May 13, 2026
KERR FINANCIAL PLANNING Corp History No change 24 0 0 0.0% Q1 2026 Apr 29, 2026