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Disclosery

Janus Henderson: MRK position timeline

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

Janus Henderson held 3,901,539 MRK 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 3,901,539 shares
    Share basis changed not comparable

    Membership change: Jupiter Topco LLC joined the group. 0.2% of the 13F portfolio, value $501,199,146.

    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 2,880,199 shares
    Change vs previous 13F +995,059 shares

    0.17% of the 13F portfolio, value $346,466,846.

    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).

  3. period ended2025-12-31
    13F 1,885,140 shares
    Change vs previous 13F -230,401 shares

    0.09% of the 13F portfolio, value $198,458,114.

    13F-HR 0001085146-26-000226 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).

  4. period ended2025-09-30
    13F 2,115,541 shares
    Change vs previous 13F +1,573,424 shares

    0.08% of the 13F portfolio, value $177,525,624.

    13F-HR 0001085146-25-005993 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).

  5. period ended2025-06-30
    13F 542,117 shares
    Change vs previous 13F -2,223,249 shares

    0.02% of the 13F portfolio, value $42,884,168.

    13F-HR 0001085146-25-005104 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).

  6. period ended2025-03-31
    13F 2,765,366 shares
    Change vs previous 13F -3,099,139 shares

    0.14% of the 13F portfolio, value $246,750,105.

    13F-HR 0001085146-25-003208 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).

  7. period ended2024-12-31
    13F 5,864,505 shares
    Change vs previous 13F -2,905,121 shares

    0.3% of the 13F portfolio, value $583,418,410.

    13F-HR 0001085146-25-001531 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).

  8. period ended2024-09-30
    13F 8,769,626 shares
    Change vs previous 13F not available

    0.51% of the 13F portfolio, value $995,888,460.

    13F-HR 0001085146-24-005765 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).