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Disclosery

Corundum Group, Inc.: COST position timeline

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

Corundum Group, Inc. held 1,507 COST 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 1,507 shares
    Change vs previous 13F +28 shares

    0.42% of the 13F portfolio, value $1,409,753.

    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 1,479 shares
    Change vs previous 13F -117 shares

    0.49% of the 13F portfolio, value $1,473,720.

    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 1,596 shares
    Change vs previous 13F +251 shares

    0.46% of the 13F portfolio, value $1,376,295.

    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 1,345 shares
    Change vs previous 13F -26 shares

    0.51% of the 13F portfolio, value $1,244,972.

    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 1,371 shares
    Change vs previous 13F +6 shares

    0.6% of the 13F portfolio, value $1,357,208.

    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 1,365 shares
    Change vs previous 13F -629 shares

    0.62% of the 13F portfolio, value $1,290,990.

    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 1,994 shares
    Change vs previous 13F +627 shares

    0.68% of the 13F portfolio, value $1,827,042.

    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 1,367 shares
    Change vs previous 13F not available

    0.55% of the 13F portfolio, value $1,211,873.

    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).