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Disclosery

GROUP ONE TRADING LLC: GTLB position timeline

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

GROUP ONE TRADING LLC held 38,243 GTLB 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 38,243 shares
    Change vs previous 13F -19,480 shares

    0.03% of the 13F portfolio, value $1,167,559.

    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 57,723 shares
    Change vs previous 13F -107,350 shares

    0.04% of the 13F portfolio, value $1,249,126.

    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 165,073 shares
    Change vs previous 13F +18,224 shares

    0.18% of the 13F portfolio, value $6,195,190.

    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 146,849 shares
    Change vs previous 13F +98,363 shares

    0.2% of the 13F portfolio, value $6,619,953.

    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 48,486 shares
    Change vs previous 13F +37,962 shares

    0.07% of the 13F portfolio, value $2,187,203.

    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 10,524 shares
    Change vs previous 13F +10,524 shares

    0.02% of the 13F portfolio, value $494,628.

    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 0 shares
    Change vs previous 13F -40,995 shares

    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).

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

  8. period ended2024-09-30
    13F 40,995 shares
    Change vs previous 13F not available

    0.08% of the 13F portfolio, value $2,112,882.

    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).