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Disclosery

Janus Henderson: ARGX position timeline

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

Janus Henderson held 2,474,015 ARGX 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 2,474,015 shares
    Share basis changed not comparable

    Membership change: Jupiter Topco LLC joined the group. 0.94% of the 13F portfolio, value $2,295,632,010.

    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 2,541,732 shares
    Change vs previous 13F +83,568 shares

    0.88% of the 13F portfolio, value $1,847,592,427.

    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 2,458,164 shares
    Change vs previous 13F -117,087 shares

    0.92% of the 13F portfolio, value $2,057,856,370.

    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 2,575,251 shares
    Change vs previous 13F +9,852 shares

    0.87% of the 13F portfolio, value $1,899,561,515.

    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 2,565,399 shares
    Change vs previous 13F +422,316 shares

    0.69% of the 13F portfolio, value $1,414,085,163.

    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 2,143,083 shares
    Change vs previous 13F -169,275 shares

    0.69% of the 13F portfolio, value $1,262,624,900.

    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 2,312,358 shares
    Change vs previous 13F -166,849 shares

    0.72% of the 13F portfolio, value $1,422,262,353.

    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 2,479,207 shares
    Change vs previous 13F not available

    0.69% of the 13F portfolio, value $1,343,796,519.

    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).