Leslie Goldman Tepper - 28 Apr 2026 Form 3/A - Amendment Insider Report for DEEP FISSION, INC.

Reporting relationship: Director
Issuer ticker: FISN on Nasdaq
Reported as of: 28 Apr 2026
Net transaction value: $0
SEC form: 3/A - Amendment
Accepted by SEC: 29 Apr 2026, 13:47:06 UTC
Original report date: 14 Nov 2025
Prior SEC filing: 10 Mar 2026
Next SEC filing: 27 Jul 2026
Source filing: View source filing
Reporting owner signature: /s/ Jon Gordon as attorney-in-Fact for Leslie Goldman Tepper

Key filing fact

Leslie Goldman Tepper filed Form 3/A - Amendment for DEEP FISSION, INC. on 29 Apr 2026.

Key facts

This page summarizes Leslie Goldman Tepper's Form 3/A - Amendment filing for DEEP FISSION, INC..
0 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 29 Apr 2026, 13:47.

Change

Previous filing in this sequence was filed on 10 Mar 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Official SEC source

Ownership activity is grounded in SEC Form 3/A - Amendment disclosures.

View source filing

Reporting Owners (1)

CIK 0002062355 Primary reporting owner

Goldman Tepper Leslie

Relationship: Director
Address: C/O DEEP FISSION INC., 2001 ADDISON ST., SUITE 300, BERKELEY
Signature: /s/ Jon Gordon as attorney-in-Fact for Leslie Goldman Tepper
Signature date: 29 Apr 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

No ticker holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 133,996
Date: 28 Apr 2026
Ownership: By Bella AJT Holdings LLC
Footnotes: F1, F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

This amendment is being filed to correct an inadvertent underreporting of 34,000 shares in the amount of securities beneficially owned by the Reporting Person as originally reported on November 14, 2025.

Footnote F2

The Reporting Person is a member of Bella AJT Holdings LLC and may be deemed to share voting and investment power over the securities held by such entity and to have a pecuniary interest therein.