Reported relationships
Latest disclosed role at each company.
| Company | Last reported as | Report date | Published |
|---|---|---|---|
| DEEP FISSION, INC.NONE · Entity 5748 | Chief Technology Officer | March 09, 2026 | March 10, 2026 |
Disclosed balances
About these balances
Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.
DEEP FISSION, INC.
Report date March 09, 2026 · Filed March 10, 2026
| Security / award | Ownership account | Disclosed shares / units | Disclosure context |
|---|---|---|---|
| Employee Stock Option (right to buy)SEC Table II · derivative / convertible security · Conversion / exercise price $15.00 · Expires 2036-03-09 | Direct | 872,363 |
Reported balance
After 2026-03-09 transaction · row 1
Instrument identity requires review; Table II rows are not merged.
1 source rowRow 1 · 2026-03-09 · Grant · Acquired 223,000 · Balance 872,363 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. |
Filing footnotes · ownership attribution and instrument terms
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.
Transaction history
JSON APIPurchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”
The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.
| Transaction date | Company | Activity / security | Shares / units | Reported price | Reported value | Details |
|---|---|---|---|---|---|---|
| March 09, 2026 Filed Mar 10, 2026 17:26 UTC | DEEP FISSION, INC. NONE · Entity 5748 | GrantEmployee Stock Option (right to buy) · Derivative | 223,000 | $0.00 Strike: $15.00 | $0.00 |
DisclosureSEC source: 0001104659-26-025947 · tm268353-4_4seq1.xml · derivative · entry 1 Muller Richard · CIK 0002081872 · Chief Technology Officer 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 872,363 Underlying: Common Stock · 223,000 shares Expires 2036-03-09 F1 · derivative.exercise_date: 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. Read SEC document |
| September 05, 2025 Filed Sep 9, 2025 17:43 UTC | DEEP FISSION, INC. NONE · Entity 5748 | GrantCommon Stock | 5,196,426 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001415889-25-023996 · form4-09092025_090935.xml · nonDerivative · entry 1 Muller Richard · CIK 0002081872 · Director · Chief Technology Officer 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 5,196,426 F1 · price: Received in connection with the Issuer's merger (the "Merger") with Deep Fission Inc. ("Legacy Deep Fission") in accordance with the terms of the Agreement and Plan of Merger and Reorganization dated as of September 5, 2025, by and among the Issuer (f/k/a Surfside Acquisition Inc.), Deep Fission Acquisition Co. and Legacy Deep Fission (the "Merger Agreement"), in exchange for shares of Legacy Deep Fission common stock. Pursuant to the terms of the Merger Agreement, at the effective time of the Merger, each issued and outstanding share of Legacy Deep Fission common stock was converted into the right to receive 17.32142 shares of the Issuer's common stock, rounded to the nearest whole share. Read SEC document |
Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.