Deep Fission, Inc. has 5 Schedule 13D or 13G filings on record since 2025-09-23. 4 holders' latest filing reports 5% or more of common stock, par value $0.0001 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Muller Elizabeth | 20.6% | 10,541,757 | SCHEDULE 13D, 2025-09-23 | 2025-09-05 |
| Muller Richard | 10.6% | 5,426,406 | SCHEDULE 13D, 2025-09-23 | 2025-09-05 |
| Mark N.Tompkins | 5.6% | 3,158,333 | SCHEDULE 13G/A, 2026-05-15 | 2026-03-31 |
| Ee Holdings Limited | 5.5% | 2,866,667 | SCHEDULE 13G, 2025-11-03 | 2025-09-30 |
Purpose of Transaction (Item 4)
Muller Elizabeth
The Reporting Person acquired the Common Stock in connection with the Merger. The information contained in Item 3 of this Schedule 13D is incorporated herein by reference. The Reporting Person serves as a Director and President and Chief Executive Officer of the Issuer. Accordingly, the Reporting Person may have influence over the corporate activities of the Issuer, including activities that may relate to items described in clauses (a) through (j) of Item 4 of this Schedule 13D. Subject to the Registration Rights Agreement described in Item 6 of this Schedule 13D, the Reporting Person may, from time to time, purchase or sell securities of the Issuer as appropriate for her personal circumstances. Except as described in this Schedule 13D, the Reporting Person does not have any present plans or proposals that relate to or would result in any of the actions described in clauses (a) through (j) of Item 4 of this Schedule 13D. The Reporting Person reserves the right to formulate plans and/or proposals and to take such actions with respect to her investment in the Issuer, including any or all of the actions set forth in clauses (a) through (j) of Item 4 of this Schedule 13D.Item 4 of the SCHEDULE 13D filed 2025-09-23
Muller Richard
The Reporting Person acquired the Common Stock in connection with the Merger. The information contained in Item 3 of this Schedule 13D is incorporated herein by reference. The Reporting Person serves as a Director and Chief Technology Officer of the Issuer. Accordingly, the Reporting Person may have influence over the corporate activities of the Issuer, including activities that may relate to items described in clauses (a) through (j) of Item 4 of this Schedule 13D. Subject to the Registration Rights Agreement described in Item 6 of this Schedule 13D, the Reporting Person may, from time to time, purchase or sell securities of the Issuer as appropriate for his personal circumstances. Except as described in this Schedule 13D, the Reporting Person does not have any present plans or proposals that relate to or would result in any of the actions described in clauses (a) through (j) of Item 4 of this Schedule 13D. The Reporting Person reserves the right to formulate plans and/or proposals and to take such actions with respect to his investment in the Issuer, including any or all of the actions set forth in clauses (a) through (j) of Item 4 of this Schedule 13D.Item 4 of the SCHEDULE 13D filed 2025-09-23
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-09-23 | Muller Elizabeth | 20.6% | SCHEDULE 13D |
| 2025-09-23 | Muller Richard | 10.6% | SCHEDULE 13D |
| 2025-11-03 | Ee Holdings Limited | 5.5% | SCHEDULE 13G |
| 2025-11-14 | Mark N. Tompkins | 5.82% | SCHEDULE 13G/A |
| 2026-05-15 | Mark N.Tompkins | 5.6% | SCHEDULE 13G/A |
Deep Fission, Inc.: every filing and event
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.