Form: EFFECT

Notice of Effectiveness

May 4, 2026

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

Notice of Effectiveness

Effectiveness Date: May 1, 2026 4:01 P.M.
Form: S-1
CIK: 0001918102
Company Name: DEEP FISSION, INC.
File Number: 333-293510