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Disclosery

GROUP ONE TRADING LLC: BIIB position timeline

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

GROUP ONE TRADING LLC held 0 BIIB shares at 2025-12-31 per its 13F-HR filed 2026-02-12.

the latest 13F is the newest step

  1. period ended2025-12-31
    13F 0 shares
    Change vs previous 13F -19,310 shares

    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).

    Exited: the 13F for this period no longer lists the position.

  2. period ended2025-09-30
    13F 19,310 shares
    Change vs previous 13F -70,908 shares

    0.08% of the 13F portfolio, value $2,704,945.

    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).

  3. period ended2025-06-30
    13F 90,218 shares
    Change vs previous 13F +77,841 shares

    0.37% of the 13F portfolio, value $11,330,479.

    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).

  4. period ended2025-03-31
    13F 12,377 shares
    Change vs previous 13F -45,544 shares

    0.07% of the 13F portfolio, value $1,693,669.

    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).

  5. period ended2024-12-31
    13F/A 57,921 shares
    Change vs previous 13F -101,314 shares

    0.3% of the 13F portfolio, value $8,857,279.

    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).

  6. period ended2024-09-30
    13F 159,235 shares
    Change vs previous 13F not available

    1.22% of the 13F portfolio, value $30,866,112.

    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).