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Disclosery

Janus Henderson: MGY position timeline

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

Janus Henderson held 6,427,893 MGY 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 6,427,893 shares
    Share basis changed not comparable

    Membership change: Jupiter Topco LLC joined the group. 0.07% of the 13F portfolio, value $164,426,683.

    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 6,279,636 shares
    Change vs previous 13F +170,174 shares

    0.09% of the 13F portfolio, value $198,247,716.

    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 6,109,462 shares
    Change vs previous 13F -245,757 shares

    0.06% of the 13F portfolio, value $133,735,730.

    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 6,355,219 shares
    Change vs previous 13F -98,885 shares

    0.07% of the 13F portfolio, value $151,699,471.

    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 6,454,104 shares
    Change vs previous 13F +3,315 shares

    0.07% of the 13F portfolio, value $145,087,865.

    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 6,450,789 shares
    Change vs previous 13F +53,914 shares

    0.09% of the 13F portfolio, value $162,496,555.

    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 6,396,875 shares
    Change vs previous 13F +667,973 shares

    0.08% of the 13F portfolio, value $149,559,330.

    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 5,728,902 shares
    Change vs previous 13F not available

    0.07% of the 13F portfolio, value $139,900,967.

    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).