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Activist & passive stakes

Investors crossing the 5% ownership line, from SEC Schedule 13D (activist) and 13G (passive) filings. Newest first.

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Filing
NewAmendmentsAll
Stake type
ActivistPassive
Min % owned
≥10%≥20%
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All filings, new and amended.1–1 of 1
  • PassiveAmendment 3Below 5%
    Nov 14, 2026
    FISN · Deep Fission, Inc.
    Tompkins Mark N.
    3.4% · 2,026,767 shSEC