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Disclosery

GROUP ONE TRADING LLC: COST position timeline

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

GROUP ONE TRADING LLC held 2,782 COST 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 2,782 shares
    Change vs previous 13F +2,782 shares

    0.08% of the 13F portfolio, value $2,602,478.

    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 0 shares
    Change vs previous 13F -16,091 shares

    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).

    Exited: the 13F for this period no longer lists the position.

  3. period ended2025-12-31
    13F 16,091 shares
    Change vs previous 13F +10,568 shares

    0.41% of the 13F portfolio, value $13,875,913.

    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 5,523 shares
    Change vs previous 13F -1,577 shares

    0.15% of the 13F portfolio, value $5,112,254.

    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 7,100 shares
    Change vs previous 13F -7,488 shares

    0.23% of the 13F portfolio, value $7,028,574.

    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 14,588 shares
    Change vs previous 13F -14,160 shares

    0.57% of the 13F portfolio, value $13,797,039.

    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 28,748 shares
    Change vs previous 13F +17,204 shares

    0.9% of the 13F portfolio, value $26,340,930.

    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).

  8. period ended2024-09-30
    13F 11,544 shares
    Change vs previous 13F not available

    0.4% of the 13F portfolio, value $10,233,987.

    13F-HR 0000932540-24-000015 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).