Thomas Anthony Shea - 31 Dec 2025 SCHEDULE 13G/A Report for ONESTREAM, INC. Class A Common Stock, par value $0.0001 per share (OS)

Filing Manager: Thomas Anthony Shea
Reporting Manager: Thomas Anthony Shea
Security: ONESTREAM, INC. Class A Common Stock, par value $0.0001 per share
Symbol: OS
Shares outstanding: 111,492,387 shares
Disclosed Ownership: 18,173,259 shares
Ownership: 16%
Form type: SCHEDULE 13G/A
Filing time: 13 Feb 2026, 18:01:41 UTC
Date of event: 31 Dec 2025
SEC: View on sec.gov

Reporting Managers (1)

Name	Ownership	Shares Owned	sole voting power	shared voting power	Signature	Title	CIK
Thomas Anthony Shea	16%	18,173,259	5,897,454	12,275,805	/s/ Thomas Anthony Shea	Thomas Anthony Shea