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Disclosery

HORIZON KINETICS ASSET MANAGEMENT LLC: BIIB position timeline

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

HORIZON KINETICS ASSET MANAGEMENT LLC held 2,726 BIIB shares at 2026-06-30 per its 13F-HR filed 2026-08-11.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 2,726 shares
    Change vs previous 13F -131 shares

    0.01% of the 13F portfolio, value $588,980.

    13F-HR 0001398344-26-014047 filed by HORIZON KINETICS ASSET MANAGEMENT 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 2,857 shares
    Change vs previous 13F -131 shares

    0.01% of the 13F portfolio, value $523,774.

    13F-HR 0001398344-26-009239 filed by HORIZON KINETICS ASSET MANAGEMENT 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 2,988 shares
    Change vs previous 13F -131 shares

    0.01% of the 13F portfolio, value $525,858.

    13F-HR 0001056823-26-000007 filed by HORIZON KINETICS ASSET MANAGEMENT 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 3,119 shares
    Change vs previous 13F +81 shares

    0.01% of the 13F portfolio, value $436,910.

    13F-HR 0001056823-25-000029 filed by HORIZON KINETICS ASSET MANAGEMENT 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 3,038 shares
    Change vs previous 13F -131 shares

    <0.01% of the 13F portfolio, value $381,542.

    13F-HR 0001056823-25-000019 filed by HORIZON KINETICS ASSET MANAGEMENT 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 3,169 shares
    Change vs previous 13F 0 shares

    <0.01% of the 13F portfolio, value $433,646.

    13F-HR 0001056823-25-000010 filed by HORIZON KINETICS ASSET MANAGEMENT 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 3,169 shares
    Change vs previous 13F +129 shares

    0.01% of the 13F portfolio, value $484,603.

    13F-HR 0001056823-25-000001 filed by HORIZON KINETICS ASSET MANAGEMENT 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 3,040 shares
    Change vs previous 13F not available

    0.01% of the 13F portfolio, value $589,274.

    13F-HR 0001056823-24-000019 filed by HORIZON KINETICS ASSET MANAGEMENT LLC
    Filed (acceptance time not in the bulk data set), ingested

    Acceptance time not in the bulk data set (spec §4.2).