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Disclosery

GROUP ONE TRADING LLC: MSOS position timeline

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

GROUP ONE TRADING LLC held 891,056 MSOS 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 891,056 shares
    Change vs previous 13F +635,648 shares

    0.13% of the 13F portfolio, value $4,526,564.

    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 255,408 shares
    Change vs previous 13F -295,998 shares

    0.03% of the 13F portfolio, value $906,698.

    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 551,406 shares
    Change vs previous 13F -617,557 shares

    0.08% of the 13F portfolio, value $2,602,636.

    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 1,168,963 shares
    Change vs previous 13F -95,878 shares

    0.17% of the 13F portfolio, value $5,599,333.

    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 1,264,841 shares
    Change vs previous 13F +765,690 shares

    0.1% of the 13F portfolio, value $3,048,267.

    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 499,151 shares
    Change vs previous 13F -20,254 shares

    0.05% of the 13F portfolio, value $1,302,784.

    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 519,405 shares
    Change vs previous 13F not available

    0.07% of the 13F portfolio, value $1,978,933.

    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).