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Disclosery

GROUP ONE TRADING LLC: STXS position timeline

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

GROUP ONE TRADING LLC held 2,936 STXS 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 2,936 shares
    Change vs previous 13F +194 shares

    <0.01% of the 13F portfolio, value $5,050.

    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 2,742 shares
    Change vs previous 13F -7,846 shares

    <0.01% of the 13F portfolio, value $5,045.

    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 10,588 shares
    Change vs previous 13F -7,508 shares

    <0.01% of the 13F portfolio, value $24,352.

    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 18,096 shares
    Change vs previous 13F +16,657 shares

    <0.01% of the 13F portfolio, value $56,279.

    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 1,439 shares
    Change vs previous 13F 0 shares

    <0.01% of the 13F portfolio, value $3,051.

    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 1,439 shares
    Change vs previous 13F -15,386 shares

    <0.01% of the 13F portfolio, value $2,533.

    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 16,825 shares
    Change vs previous 13F +9,318 shares

    <0.01% of the 13F portfolio, value $38,361.

    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 7,507 shares
    Change vs previous 13F not available

    <0.01% of the 13F portfolio, value $15,314.

    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).