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Mark N. Tompkins is Director at Deep Fission. OQRO lists 1 transaction filed with the SEC under this name, the latest on Aug 28, 2025, each linked to the official Form 4.
Director
Disclosures on record
1
Companies involved
1
As of the latest filing on , Mark N. Tompkins reported holding 4,725,000 shares of Deep Fission (FISN), worth about $9.73M at the last close of $2 (Nov 13, 2026).
| Company | Shares reported | How held | Last close | Value at last close | Reported |
|---|---|---|---|---|---|
| Deep Fission FISN | 4,725,000 | 4.72M direct | $2 | $9.73M | Aug 26, 2025 |
Is this Mark N. Tompkins’s net worth? No. A Form 4 reports the shares an insider owns in one company after each transaction, directly or through trusts and entities. It says nothing about cash, other investments, property or debt, options not yet exercised are not counted here, and a holding reported some time ago may have changed without a new filing. The value is shares times the last stored close, not a price anyone received. Sources: the filings listed below, each linked to EDGAR. Compare with the biggest insider stakes.
Deep FissionFISN
Aug 26, 2025Sold~$3disclosed Aug 28
DetailsOfficial recordOn the latest SEC Form 4, dated Aug 26, 2025, Mark N. Tompkins reported holding 4,725,000 shares of Deep Fission (FISN). At the last close of $2 on Nov 13, 2026, that is about $9.73M. This is the stake disclosed in filings, not a net worth.
Mark N. Tompkins bought shares on the open market in 2017, 2020, 2021 and 2022, and has not bought since 2022 across 4 companies. Sales in 2 of the 10 years since 2017.
In SEC filings since 2017: the latest open-market purchase is from 2022; the latest open-market sale is from 2025.
4 companies: Deep Fission (FISN, 2025), Aeluma (ALMU, 2021–2022), Amesite (AMST, 2020–2021), Exicure (XCUR, 2017).
Mark N. Tompkins bought shares on the open market in 2017, 2020, 2021 and 2022, and has not bought since 2022 across 4 companies. Sales in 2 of the 10 years since 2017.
Mark N. Tompkins reported 6 open-market purchases and 41 sales since 2017; purchases in 4 different years, most recently 2022.
| Year | Bought | Sold |
|---|---|---|
| 2025 | — | $31×1 trade |
| 2022 | $250K1×1 trade | — |
| 2021 | $715K2×2 trades |
| 2020 | $100K1×1 trade | — |
| 2017 | $501K2×2 trades | — |
Open-market purchases (code P) and sales (code S) on Forms 4 and 5. Up to Sep 2024 from the SEC's Insider Transactions Data Sets; since Oct 2024 from each filing as it is published. A trade filed twice (an amendment) counts once. Dollar totals use the price the filer reported; lines with no price count as trades without a value.
Mark N. Tompkins reported 1 open-market purchase and 40 sales here, 2020 to 2021.
Mark N. Tompkins reported 3 open-market purchases and 0 sales here, 2021 to 2022.
Mark N. Tompkins reported 2 open-market purchases and 0 sales here, 2017.
Closing prices and the companies' last annual figures; a − or + is a fact of the close, not a forecast.
