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

Filing Manager: Mark N. Tompkins
Reporting Manager: Mark N. Tompkins
Security: Deep Fission, Inc. Common Stock, par value $0.0001 per share
Shares outstanding: 50,830,464 shares
Disclosed Ownership: 2,958,333 shares
Ownership: 5.8%
Form type: SCHEDULE 13G/A
Filing time: 14 Nov 2025, 15:36:30 UTC
Date of event: 30 Sep 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	5.8%	2,958,333	2,958,333	0	/s/ Mark N. Tompkins	Mark N. Tompkins