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Disclosery

GROUP ONE TRADING LLC: MBI position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of GROUP ONE TRADING LLC on MBI, newest first. How the timeline and the estimate are built.

GROUP ONE TRADING LLC held 129,044 MBI 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 129,044 shares
    Change vs previous 13F +56,907 shares

    0.02% of the 13F portfolio, value $841,367.

    13F-HR 0000932540-26-000011 filed by GROUP ONE TRADING 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 72,137 shares
    Change vs previous 13F -114,130 shares

    0.01% of the 13F portfolio, value $426,330.

    13F-HR 0000932540-26-000005 filed by GROUP ONE TRADING LLC
    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 186,267 shares
    Change vs previous 13F -11,895 shares

    0.04% of the 13F portfolio, value $1,333,672.

    13F-HR 0000932540-26-000002 filed by GROUP ONE TRADING LLC
    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 198,162 shares
    Change vs previous 13F +37,350 shares

    0.04% of the 13F portfolio, value $1,476,307.

    13F-HR 0000932540-25-000040 filed by GROUP ONE TRADING LLC
    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 160,812 shares
    Change vs previous 13F -11,427 shares

    0.02% of the 13F portfolio, value $697,924.

    13F-HR 0000932540-25-000034 filed by GROUP ONE TRADING LLC
    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 172,239 shares
    Change vs previous 13F -3,496 shares

    0.04% of the 13F portfolio, value $857,750.

    13F-HR 0000932540-25-000027 filed by GROUP ONE TRADING LLC
    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/A 175,735 shares
    Change vs previous 13F not available

    0.04% of the 13F portfolio, value $1,135,248.

    13F-HR/A 0000932540-25-000028 filed by GROUP ONE TRADING LLC
    Filed (acceptance time not in the bulk data set), ingested

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