William A. Schmitz - 09 Mar 2026 Form 4 Insider Report for DEEP FISSION, INC.

Role: Chief Financial Officer
Signature: /s/ Jon Gordon, as Attorney-in-Fact for William A. Schmitz
Issuer symbol: N/A
Transactions as of: 09 Mar 2026
Net transactions value: $0
Form type: 4
Filing time: 10 Mar 2026, 17:31:14 UTC
Previous filing: 23 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Schmitz William Mark	Chief Financial Officer	C/O DEEP FISSION, INC., 2001 ADDISON ST., SUITE 300, BERKELEY	/s/ Jon Gordon, as Attorney-in-Fact for William A. Schmitz	10 Mar 2026	0001409378

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction		Employee Stock Option (right to buy)	Award		+223,000	+22755%	$0.000000^*	223,980	09 Mar 2026	Common Stock	223,000	$15.00	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Date at which first vesting occurs is indicated. One-fourth of the total number of options to purchase the Company's common stock vests on the first vesting date shown and an additional one-thirty sixth on each month thereafter until fully vested.