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Disclosery

GROUP ONE TRADING LLC: AMSC position timeline

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

GROUP ONE TRADING LLC held 13,622 AMSC 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 13,622 shares
    Change vs previous 13F +1,344 shares

    0.02% of the 13F portfolio, value $565,449.

    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 12,278 shares
    Change vs previous 13F +9,237 shares

    0.01% of the 13F portfolio, value $415,610.

    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 3,041 shares
    Change vs previous 13F -43,862 shares

    <0.01% of the 13F portfolio, value $87,520.

    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 46,903 shares
    Change vs previous 13F +39,604 shares

    0.08% of the 13F portfolio, value $2,785,569.

    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 7,299 shares
    Change vs previous 13F not available

    0.01% of the 13F portfolio, value $267,800.

    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).