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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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Amendments only.1–1 of 1
  • PassiveAmendment 1
    Nov 12, 2026
    IRTC · iRhythm Holdings, Inc.
    Artisan Partners Asset Management Inc.
    6.7% · 2,195,855 shSEC