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Disclosery

Corundum Group, Inc.: MRK position timeline

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

Corundum Group, Inc. held 10,703 MRK 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 10,703 shares
    Change vs previous 13F +205 shares

    0.41% of the 13F portfolio, value $1,375,335.

    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 10,498 shares
    Change vs previous 13F +941 shares

    0.42% of the 13F portfolio, value $1,262,804.

    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 9,557 shares
    Change vs previous 13F -187 shares

    0.34% of the 13F portfolio, value $1,005,970.

    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 9,744 shares
    Change vs previous 13F +123 shares

    0.34% of the 13F portfolio, value $817,814.

    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 9,621 shares
    Change vs previous 13F -149 shares

    0.34% of the 13F portfolio, value $761,598.

    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 9,770 shares
    Change vs previous 13F -1,886 shares

    0.42% of the 13F portfolio, value $876,955.

    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 11,656 shares
    Change vs previous 13F +1,002 shares

    0.43% of the 13F portfolio, value $1,159,539.

    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 10,654 shares
    Change vs previous 13F not available

    0.55% of the 13F portfolio, value $1,209,868.

    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).