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Disclosery

GROUP ONE TRADING LLC: ALK position timeline

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

GROUP ONE TRADING LLC held 351,374 ALK 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 351,374 shares
    Change vs previous 13F +340,007 shares

    0.53% of the 13F portfolio, value $18,341,723.

    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 11,367 shares
    Change vs previous 13F -88,232 shares

    0.01% of the 13F portfolio, value $418,078.

    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 99,599 shares
    Change vs previous 13F +17,152 shares

    0.15% of the 13F portfolio, value $5,009,830.

    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 82,447 shares
    Change vs previous 13F +65,973 shares

    0.12% of the 13F portfolio, value $4,104,212.

    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 16,474 shares
    Change vs previous 13F +9,157 shares

    0.03% of the 13F portfolio, value $815,134.

    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 7,317 shares
    Change vs previous 13F -119,999 shares

    0.02% of the 13F portfolio, value $360,143.

    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 127,316 shares
    Change vs previous 13F +100,014 shares

    0.28% of the 13F portfolio, value $8,243,711.

    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 27,302 shares
    Change vs previous 13F not available

    0.05% of the 13F portfolio, value $1,234,323.

    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).