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Disclosery

GROUP ONE TRADING LLC: ATYR position timeline

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

GROUP ONE TRADING LLC held 138,878 ATYR 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 138,878 shares
    Change vs previous 13F -45,136 shares

    <0.01% of the 13F portfolio, value $82,882.

    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 184,014 shares
    Change vs previous 13F -7,034 shares

    <0.01% of the 13F portfolio, value $143,531.

    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 191,048 shares
    Change vs previous 13F +173,808 shares

    <0.01% of the 13F portfolio, value $149,610.

    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 17,240 shares
    Change vs previous 13F -53,527 shares

    <0.01% of the 13F portfolio, value $12,437.

    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 70,767 shares
    Change vs previous 13F -18,904 shares

    0.01% of the 13F portfolio, value $358,789.

    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 89,671 shares
    Change vs previous 13F +82,431 shares

    0.01% of the 13F portfolio, value $270,806.

    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 7,240 shares
    Change vs previous 13F not available

    <0.01% of the 13F portfolio, value $26,209.

    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).