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Disclosery

Janus Henderson: ARM position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Janus Henderson on ARM, newest first. How the timeline and the estimate are built.

Janus Henderson held 146,297 ARM shares at 2026-06-30 per its 13F-HR filed 2026-08-14.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 146,297 shares
    Share basis changed not comparable

    Membership change: Jupiter Topco LLC joined the group. 0.02% of the 13F portfolio, value $51,872,550.

    13F-HR 0001085146-26-000611 filed by Jupiter Topco LLC
    Filed (acceptance time not in the bulk data set), ingested

    Acceptance time not in the bulk data set (spec §4.2).

  2. period ended2026-03-31
    13F/A 767,534 shares
    Change vs previous 13F not available

    0.06% of the 13F portfolio, value $116,112,425.

    13F-HR/A 0001085146-26-000420 filed by JANUS HENDERSON GROUP PLC
    Filed (acceptance time not in the bulk data set), ingested

    Acceptance time not in the bulk data set (spec §4.2).