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VANGUARD GROUP INC: BIIB position timeline

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

VANGUARD GROUP INC held 17,817,720 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 17,817,720 shares
    Change vs previous 13F +219,474 shares

    0.05% of the 13F portfolio, value $3,849,696,583.

    13F-HR 0002100119-26-001527 filed by VANGUARD CAPITAL MANAGEMENT LLC
    Filed (acceptance time not in the bulk data set), ingested

    • VANGUARD FIDUCIARY TRUST CO: 829,318 shares
    • Vanguard Investments Australia, Ltd.: 74,714 shares
    • VANGUARD ASSET MANAGEMENT, Ltd: 284,376 shares
    • Vanguard Personalized Indexing Management, LLC: 37,015 shares
    • Vanguard Global Advisers, LLC: 335,936 shares
    • Vanguard National Trust Co: 308 shares
    • VANGUARD CAPITAL MANAGEMENT LLC: 9,651,117 shares
    • VANGUARD PORTFOLIO MANAGEMENT LLC: 6,604,936 shares

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

  2. period ended2026-03-31
    13F/A 17,598,246 shares
    Change vs previous 13F +112,561 shares

    0.05% of the 13F portfolio, value $3,226,286,439.

    13F-HR/A 0002100119-26-001311 filed by VANGUARD CAPITAL MANAGEMENT LLC
    Filed (acceptance time not in the bulk data set), ingested

    • VANGUARD FIDUCIARY TRUST CO: 825,531 shares
    • Vanguard Investments Australia, Ltd.: 73,268 shares
    • VANGUARD ASSET MANAGEMENT, Ltd: 249,778 shares
    • Vanguard Personalized Indexing Management, LLC: 36,413 shares
    • Vanguard Global Advisers, LLC: 343,768 shares
    • Vanguard National Trust Co: 344 shares
    • VANGUARD CAPITAL MANAGEMENT LLC: 9,537,417 shares
    • VANGUARD PORTFOLIO MANAGEMENT LLC: 6,531,727 shares

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

  3. period ended2025-12-31
    13F 17,485,685 shares
    Change vs previous 13F +157,776 shares

    0.04% of the 13F portfolio, value $3,077,305,703.

    13F-HR 0000102909-26-000031 filed by VANGUARD GROUP INC
    Filed (acceptance time not in the bulk data set), ingested

    • VANGUARD GROUP INC: 17,447,092 shares
    • Vanguard Personalized Indexing Management, LLC: 38,593 shares

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

  4. period ended2025-09-30
    13F 17,327,909 shares
    Change vs previous 13F +2,330 shares

    0.04% of the 13F portfolio, value $2,427,293,492.

    13F-HR 0000102909-25-000353 filed by VANGUARD GROUP INC
    Filed (acceptance time not in the bulk data set), ingested

    • VANGUARD GROUP INC: 17,289,235 shares
    • Vanguard Personalized Indexing Management, LLC: 38,674 shares

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

  5. period ended2025-06-30
    13F 17,325,579 shares
    Change vs previous 13F +271,038 shares

    0.04% of the 13F portfolio, value $2,175,919,466.

    13F-HR 0001752724-25-185843 filed by VANGUARD GROUP INC
    Filed (acceptance time not in the bulk data set), ingested

    • VANGUARD GROUP INC: 17,290,651 shares
    • Vanguard Personalized Indexing Management, LLC: 34,928 shares

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

  6. period ended2025-03-31
    13F 17,054,541 shares
    Change vs previous 13F +284,008 shares

    0.04% of the 13F portfolio, value $2,333,743,391.

    13F-HR 0001752724-25-099331 filed by VANGUARD GROUP INC
    Filed (acceptance time not in the bulk data set), ingested

    • VANGUARD GROUP INC: 17,032,839 shares
    • Vanguard Personalized Indexing Management, LLC: 21,702 shares

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

  7. period ended2024-12-31
    13F 16,770,533 shares
    Change vs previous 13F +80,727 shares

    0.04% of the 13F portfolio, value $2,564,549,906.

    13F-HR 0001752724-25-022205 filed by VANGUARD GROUP INC
    Filed (acceptance time not in the bulk data set), ingested

    • VANGUARD GROUP INC: 16,748,875 shares
    • Vanguard Personalized Indexing Management, LLC: 21,658 shares

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

  8. period ended2024-09-30
    13F 16,689,806 shares
    Change vs previous 13F not available

    0.06% of the 13F portfolio, value $3,235,152,005.

    13F-HR 0001752724-24-248565 filed by VANGUARD GROUP INC
    Filed (acceptance time not in the bulk data set), ingested

    • VANGUARD GROUP INC: 16,678,507 shares
    • Vanguard Personalized Indexing Management, LLC: 11,299 shares

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