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Disclosery

GROUP ONE TRADING LLC: ALTO position timeline

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

GROUP ONE TRADING LLC held 29,582 ALTO 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 29,582 shares
    Change vs previous 13F -63,415 shares

    <0.01% of the 13F portfolio, value $168,617.

    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 92,997 shares
    Change vs previous 13F -6,466 shares

    0.01% of the 13F portfolio, value $450,105.

    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 99,463 shares
    Change vs previous 13F -21,679 shares

    0.01% of the 13F portfolio, value $286,453.

    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 121,142 shares
    Change vs previous 13F -67,947 shares

    <0.01% of the 13F portfolio, value $130,833.

    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 189,089 shares
    Change vs previous 13F -100,296 shares

    0.01% of the 13F portfolio, value $217,452.

    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 289,385 shares
    Change vs previous 13F +215,748 shares

    0.01% of the 13F portfolio, value $329,899.

    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 73,637 shares
    Change vs previous 13F +6,697 shares

    <0.01% of the 13F portfolio, value $114,874.

    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 66,940 shares
    Change vs previous 13F not available

    <0.01% of the 13F portfolio, value $107,773.

    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).