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Disclosery

FMR LLC: BIIB position timeline

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

FMR LLC held 18,217,239 BIIB shares at 2026-06-30 per its 13F-HR filed 2026-08-13.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 18,217,239 shares
    Change vs previous 13F +5,409,698 shares

    0.17% of the 13F portfolio, value $3,936,016,552.

    13F-HR 0000315066-26-002260 filed by FMR 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 12,807,541 shares
    Change vs previous 13F +3,381,678 shares

    0.12% of the 13F portfolio, value $2,348,006,582.

    13F-HR 0000315066-26-001390 filed by FMR 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 9,425,863 shares
    Change vs previous 13F +8,138,103 shares

    0.08% of the 13F portfolio, value $1,658,857,459.

    13F-HR 0000315066-26-000611 filed by FMR 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 1,287,760 shares
    Change vs previous 13F -386,460 shares

    0.01% of the 13F portfolio, value $180,389,352.

    13F-HR 0000315066-25-002929 filed by FMR 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 1,674,220 shares
    Change vs previous 13F +365,392 shares

    0.01% of the 13F portfolio, value $210,265,290.

    13F-HR 0000315066-25-002231 filed by FMR 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 1,308,828 shares
    Change vs previous 13F +551,258 shares

    0.01% of the 13F portfolio, value $179,099,992.

    13F-HR 0000315066-25-001380 filed by FMR 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 757,570 shares
    Change vs previous 13F +376,356 shares

    0.01% of the 13F portfolio, value $115,847,623.

    13F-HR 0000315066-25-000939 filed by FMR 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 381,214 shares
    Change vs previous 13F not available

    <0.01% of the 13F portfolio, value $73,894,576.

    13F-HR 0001385495-24-000014 filed by FMR LLC
    Filed (acceptance time not in the bulk data set), ingested

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