Adiumentum Capital Fund I LP - 14 May 2025 SCHEDULE 13D/A Report for Atara Biotherapeutics, Inc. Common Stock, par value $0.0001 per share (ATRA)

Filing Manager: Adiumentum Capital Fund I LP
Reporting Manager: Adiumentum Capital Fund I LP
Security: Atara Biotherapeutics, Inc. Common Stock, par value $0.0001 per share
Symbol: ATRA
Shares outstanding: 6,853,832 shares
Disclosed Ownership: 1,370,081 shares
Ownership: 20%
Form type: SCHEDULE 13D/A
Filing time: 16 May 2025, 18:28:02 UTC
Date of event: 14 May 2025
SEC: View on sec.gov

Reporting Managers (3)

Name	Ownership	Shares Owned	shared voting power	Signature	Title	CIK
Adiumentum Capital Fund I LP	20%	1,370,081	1,370,081	/s/ Gregory A. Ciongoli	By: Adiumentum Capital Fund I GP, LLC, its general partner Name: Gregory A. Ciongoli, Title: Managing Member	0002023734
Adiumentum Capital Fund I GP LLC	20%	1,370,081	1,370,081	/s/ Gregory A. Ciongoli	Name: Gregory A. Ciongoli, Title: Managing Member	0002023736
Gregory A. Ciongoli	20%	1,370,081	1,370,081	/s/ Gregory A. Ciongoli	Name: Gregory A. Ciongoli	0002023732