Mark Tompkins - Sep 30, 2025 SCHEDULE 13G/A Report for Deep Fission, Inc. Common Stock, par value $0.0001 per share

Filing Manager: Mark Tompkins
Reporting Manager: Mark N. Tompkins
Security: Deep Fission, Inc. Common Stock, par value $0.0001 per share
Shares outstanding: 50.8M shares
Disclosed Ownership: 2.96M shares
Ownership: 5.82%
Form type: SCHEDULE 13G/A
Date filed: 11/14/2025, 03:36 PM
Date of event: Sep 30, 2025
SEC: View on sec.gov

Reporting Managers (1)

Name	Ownership	Shares Owned	sole voting power	shared voting power	Signature	Title	CIK
Mark N. Tompkins	5.82%	2.96M	2.96M	0	/s/ Mark N. Tompkins	Mark N. Tompkins