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Disclosery

Corundum Group, Inc.: MA position timeline

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

Corundum Group, Inc. held 2,508 MA 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 2,508 shares
    Change vs previous 13F +28 shares

    0.38% of the 13F portfolio, value $1,288,109.

    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 2,480 shares
    Change vs previous 13F +840 shares

    0.41% of the 13F portfolio, value $1,239,157.

    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 1,640 shares
    Change vs previous 13F -703 shares

    0.31% of the 13F portfolio, value $936,243.

    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 2,343 shares
    Change vs previous 13F -59 shares

    0.55% of the 13F portfolio, value $1,332,722.

    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 2,402 shares
    Change vs previous 13F +721 shares

    0.6% of the 13F portfolio, value $1,349,780.

    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 1,681 shares
    Change vs previous 13F -1,381 shares

    0.44% of the 13F portfolio, value $921,390.

    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 3,062 shares
    Change vs previous 13F +1,536 shares

    0.6% of the 13F portfolio, value $1,612,357.

    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).

  8. period ended2024-09-30
    13F 1,526 shares
    Change vs previous 13F not available

    0.34% of the 13F portfolio, value $753,539.

    13F-HR 0001486083-24-000004 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).