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Disclosery

Corundum Group, Inc.: DUK position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Corundum Group, Inc. on DUK, newest first. How the timeline and the estimate are built.

Corundum Group, Inc. held 10,621 DUK shares at 2026-06-30 per its 13F-HR filed 2026-08-07.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 10,621 shares
    Change vs previous 13F -146 shares

    0.4% of the 13F portfolio, value $1,344,406.

    13F-HR 0001486083-26-000003 filed by Corundum Group, Inc.
    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 10,767 shares
    Change vs previous 13F +6,822 shares

    0.47% of the 13F portfolio, value $1,409,831.

    13F-HR 0001486083-26-000002 filed by Corundum Group, Inc.
    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 3,945 shares
    Change vs previous 13F -5,701 shares

    0.16% of the 13F portfolio, value $462,393.

    13F-HR 0001486083-26-000001 filed by Corundum Group, Inc.
    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 9,646 shares
    Change vs previous 13F -26 shares

    0.49% of the 13F portfolio, value $1,193,692.

    13F-HR 0001486083-25-000006 filed by Corundum Group, Inc.
    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 9,672 shares
    Change vs previous 13F +161 shares

    0.5% of the 13F portfolio, value $1,141,296.

    13F-HR 0001486083-25-000005 filed by Corundum Group, Inc.
    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 9,511 shares
    Change vs previous 13F -5,020 shares

    0.56% of the 13F portfolio, value $1,160,057.

    13F-HR 0001486083-25-000004 filed by Corundum Group, Inc.
    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 14,531 shares
    Change vs previous 13F not available

    0.58% of the 13F portfolio, value $1,565,570.

    13F-HR 0001486083-25-000001 filed by Corundum Group, Inc.
    Filed (acceptance time not in the bulk data set), ingested

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