Redmile Group, LLC - 12 Nov 2025 SCHEDULE 13D/A Report for Atara Biotherapeutics, Inc. Common Stock, par value $0.0001 per share (ATRA)

Filing Manager
Redmile Group, LLC
Reporting Manager
Redmile Group, LLC
Security
Atara Biotherapeutics, Inc. Common Stock, par value $0.0001 per share
Symbol
ATRA
Shares outstanding
7,588,111 shares
Disclosed Ownership
751,223 shares
Ownership
9.9%
Form type
SCHEDULE 13D/A
Filing time
14 Nov 2025, 16:19:25 UTC
Date of event
12 Nov 2025
Previous filing
23 May 2025
SEC
View on sec.gov

Reporting Managers (5)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Redmile Group, LLC 9.9% 751,223 0 751,223 /s/ Jeremy C. Green Managing Member 0001425738
Jeremy C. Green 9.9% 751,223 0 751,223 /s/ Jeremy C. Green Jeremy C. Green 0001650527
RedCo I, L.P. 4.7% 347,442 0 347,442 /s/ Jeremy C. Green Managing Member of RedCo I (GP), LLC, general partner of RedCo I, L.P. 0001813157
Redmile Biopharma Investments II, L.P. 6% 452,153 0 452,153 /s/ Jeremy C. Green Managing Member of Redmile Biopharma Investments II (GP), LLC, general partner of Redmile Biopharma Investments II, L.P. 0001772230
Redmile Strategic Long Only Trading Sub, Ltd. 5% 376,377 0 376,377 /s/ Jeremy C. Green Managing Member of Redmile Group, LLC, investment manager of Redmile Strategic Long Only Trading Sub, Ltd. 0002048243