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

All filings, new and amended.1–2 of 2

PassiveAmendment 1Below 5%
Oct 30, 2026
CABA · Cabaletta Bio Inc
Vanguard Capital Management
3.79% · 8,187,183 shSEC
PassiveAmendment 1
Oct 27, 2026
CABA · Cabaletta Bio, Inc.
BlackRock, Inc.
7.7% · 13,013,495 shSEC

Filing	Symbol	Holder	% Owned	Shares	Filed	SEC filing
PassiveAmendment 1Below 5%	CABA	Vanguard Capital Management in Cabaletta Bio Inc	3.79%	8,187,183	Oct 30, 2026	SEC
PassiveAmendment 1	CABA	BlackRock, Inc. in Cabaletta Bio, Inc.	7.7%	13,013,495	Oct 27, 2026	SEC