Atara Biotherapeutics, Inc.

Historical 13F Holders

Symbol
ATRA
CUSIP
046513206
All holders as of
Q2 2026
Type
Equity
Class
COM NEW
Reported Value, Excluding Options
Total Filings

13D/G Filers

Investors who own more than 5% of a class must file a Schedule 13D or 13G. Each filer's latest filing for 046513206 since 12/18/2024, largest first.

Filer % of Class Filed
EcoR1 Capital, LLC 13G/A
17.4% 5/7/2026
Event 5/7/2026
Redmile Group, LLC 13D/A
9.9% 7/24/2026
Event 7/22/2026
Panacea Innovation Ltd 13G
9.5% 2/6/2025
Event 1/30/2025
Adage Capital Management, L.P. 13G
8.6% 5/13/2026
Event 3/31/2026
Point72 Asset Management, L.P. 13G/A
7.6% 8/14/2026
Event 6/30/2026

13F Holders by Quarter

Period Filings Shares, Excl. Options Value, Excl. Options
2026 Q2 36 4.47 M $51.3 M
2026 Q1 33 2.56 M $12.1 M
2025 Q4 42 2.05 M $37.1 M
2025 Q3 38 1.88 M $27.0 M
2025 Q2 34 1.80 M $13.9 M
2025 Q1 38 2.09 M $12.4 M
2024 Q4 43 2.39 M $31.8 M
2024 Q3 36 2.42 M $19.6 M
2024 Q2 49 2.67 M $22.7 M