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Disclosery

GROUP ONE TRADING LLC: TDAY position timeline

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

GROUP ONE TRADING LLC held 0 TDAY shares at 2026-03-31 per its 13F-HR filed 2026-05-13.

the latest 13F is the newest step

  1. period ended2026-03-31
    13F 0 shares
    Change vs previous 13F -2,405 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.

  2. period ended2025-12-31
    13F 2,405 shares
    Change vs previous 13F -33,638 shares

    <0.01% of the 13F portfolio, value $12,386.

    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).

  3. period ended2025-09-30
    13F 36,043 shares
    Change vs previous 13F +8,516 shares

    <0.01% of the 13F portfolio, value $148,858.

    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).

  4. period ended2025-06-30
    13F 27,527 shares
    Change vs previous 13F -79,088 shares

    <0.01% of the 13F portfolio, value $98,547.

    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).

  5. period ended2025-03-31
    13F 106,615 shares
    Change vs previous 13F -134,086 shares

    0.01% of the 13F portfolio, value $308,117.

    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).

  6. period ended2024-12-31
    13F/A 240,701 shares
    Change vs previous 13F +73,073 shares

    0.04% of the 13F portfolio, value $1,217,947.

    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).

  7. period ended2024-09-30
    13F 167,628 shares
    Change vs previous 13F not available

    0.04% of the 13F portfolio, value $942,069.

    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).