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BlackRock, Inc.: BIIB position timeline

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

BlackRock, Inc. held 15,985,736 BIIB shares at 2026-06-30 per its 13F-HR filed 2026-08-07.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 15,985,736 shares
    Change vs previous 13F +11,135 shares

    0.05% of the 13F portfolio, value $3,453,877,982.

    13F-HR 0002012383-26-003238 filed by BlackRock, Inc.
    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 15,974,601 shares
    Change vs previous 13F +1,163,231 shares

    0.05% of the 13F portfolio, value $2,928,623,480.

    13F-HR 0002012383-26-001841 filed by BlackRock, Inc.
    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 14,811,370 shares
    Change vs previous 13F +47,418 shares

    0.04% of the 13F portfolio, value $2,606,652,919.

    13F-HR 0002012383-26-000920 filed by BlackRock, Inc.
    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 14,763,952 shares
    Change vs previous 13F +1,208,486 shares

    0.04% of the 13F portfolio, value $2,068,134,447.

    13F-HR 0002012383-25-002949 filed by BlackRock, Inc.
    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 13,555,466 shares
    Change vs previous 13F -1,655,570 shares

    0.03% of the 13F portfolio, value $1,702,431,056.

    13F-HR 0001060021-25-000120 filed by BlackRock, Inc.
    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 15,211,036 shares
    Change vs previous 13F -262,674 shares

    0.04% of the 13F portfolio, value $2,081,478,238.

    13F-HR 0001576419-25-000869 filed by BlackRock, Inc.
    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 15,473,710 shares
    Change vs previous 13F +126,669 shares

    0.05% of the 13F portfolio, value $2,366,239,663.

    13F-HR 0001060021-25-000002 filed by BlackRock, Inc.
    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 15,347,041 shares
    Change vs previous 13F not available

    0.06% of the 13F portfolio, value $2,974,870,411.

    13F-HR 0001426459-24-000006 filed by BlackRock, Inc.
    Filed (acceptance time not in the bulk data set), ingested

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