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

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Quoteable Key Fact

"Redmile Group, LLC disclosed 9.9% ownership in Atara Biotherapeutics, Inc. Common Stock, par value $0.0001 per share (ATRA) on 12 Nov 2025."

Quick Takeaways

  • Redmile Group, LLC filed SCHEDULE 13D/A for Atara Biotherapeutics, Inc. Common Stock, par value $0.0001 per share (ATRA).
  • Disclosed ownership: 9.9%.
  • Date of event: 12 Nov 2025.

What Changed

  • Previous schedule filing date: 23 May 2025.
  • Current filing was accepted on 14 Nov 2025, 16:19.

Why This Matters

  • This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
  • You can verify ownership claims directly against the original SEC filing.

Official SEC Source

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

See Original Filing

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

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