Michael Allen Brasel - 18 Feb 2026 Form 4 Insider Report for DEEP FISSION, INC.

Role: Chief Operating Officer (Section 16 Officer).
Signature: /s/ Michael Brasel
Issuer symbol: N/A
Transactions as of: 18 Feb 2026
Net transactions value: $0
Form type: 4
Filing time: 24 Feb 2026, 13:42:23 UTC
Previous filing: 07 Jan 2026
Next filing: 10 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Brasel Michael Allen	Chief Operating Officer (Section 16 Officer).	C/O DEEP FISSION, INC., 2001 ADDISON STREET, SUITE 300, BERKELEY	/s/ Michael Brasel	24 Feb 2026	0002103077

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	$0	+15,000		$0.000000	15,000	18 Feb 2026	Common Stock	15,000	$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.

Remarks:

Chief Operating Officer (Section 16 Officer).