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

Stake type

Min % owned

Amendments only.1–2 of 2

PassiveAmendment 3Below 5%
Nov 14, 2026
FISN · Deep Fission, Inc.
Tompkins Mark N.
3.4% · 2,026,767 shSEC
PassiveAmendment 9Below 5%
Nov 9, 2026
PKOH · Park Ohio Holdings Corp
Private Management Group Inc
4.5% · 645,494 shSEC

Filing	Symbol	Holder	% Owned	Shares	Filed	SEC filing
PassiveAmendment 3Below 5%	FISN	Tompkins Mark N. in Deep Fission, Inc.	3.4%	2,026,767	Nov 14, 2026	SEC
PassiveAmendment 9Below 5%	PKOH	Private Management Group Inc in Park Ohio Holdings Corp	4.5%	645,494	Nov 9, 2026	SEC