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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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New filings only, amendments hidden. Show all filings →1–2 of 2
  • PassiveNew
    Oct 30, 2026
    KOP · Koppers Holdings Inc
    Vanguard Capital Management
    5.04% · 954,282 shSEC
  • PassiveNew
    Oct 29, 2026
    ADCT · ADC Therapeutics SA
    Bain Capital Life Sciences Opportunities IV, L.P.
    9.99% · 14,825,625 shSEC