Redmile Group, LLC - Nov 12, 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
7.59M shares
Disclosed Ownership
751K shares
Ownership
9.9%
Form type
SCHEDULE 13D/A
Date filed
11/14/2025, 04:19 PM
Date of event
Nov 12, 2025
Previous filing
May 23, 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% 751K 0 751K /s/ Jeremy C. Green Managing Member 0001425738
Jeremy C. Green 9.9% 751K 0 751K /s/ Jeremy C. Green Jeremy C. Green 0001650527
RedCo I, L.P. 4.7% 347K 0 347K /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% 452K 0 452K /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% 376K 0 376K /s/ Jeremy C. Green Managing Member of Redmile Group, LLC, investment manager of Redmile Strategic Long Only Trading Sub, Ltd. 0002048243