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AMERICAN CENTURY COMPANIES INC: BIIB position timeline

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

AMERICAN CENTURY COMPANIES INC held 114,152 BIIB shares at 2026-06-30 per its 13F-HR filed 2026-08-12.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 114,152 shares
    Change vs previous 13F +9,369 shares

    0.01% of the 13F portfolio, value $24,663,681.

    13F-HR 0000748054-26-000005 filed by AMERICAN CENTURY COMPANIES 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 104,783 shares
    Change vs previous 13F +18,959 shares

    0.01% of the 13F portfolio, value $19,209,868.

    13F-HR 0000748054-26-000002 filed by AMERICAN CENTURY COMPANIES 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 85,824 shares
    Change vs previous 13F +15,431 shares

    0.01% of the 13F portfolio, value $15,104,166.

    13F-HR 0000748054-26-000001 filed by AMERICAN CENTURY COMPANIES 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 70,393 shares
    Change vs previous 13F -10,860 shares

    0.01% of the 13F portfolio, value $9,860,651.

    13F-HR 0000748054-25-000009 filed by AMERICAN CENTURY COMPANIES 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 81,253 shares
    Change vs previous 13F +20,778 shares

    0.01% of the 13F portfolio, value $10,204,564.

    13F-HR 0001085146-25-004910 filed by AMERICAN CENTURY COMPANIES 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 60,475 shares
    Change vs previous 13F -54,899 shares

    0.01% of the 13F portfolio, value $8,275,399.

    13F-HR 0001085146-25-003039 filed by AMERICAN CENTURY COMPANIES 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 115,374 shares
    Change vs previous 13F -101,604 shares

    0.01% of the 13F portfolio, value $17,642,992.

    13F-HR 0001085146-25-000985 filed by AMERICAN CENTURY COMPANIES 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 216,978 shares
    Change vs previous 13F not available

    0.02% of the 13F portfolio, value $42,059,016.

    13F-HR 0001085146-24-005525 filed by AMERICAN CENTURY COMPANIES INC
    Filed (acceptance time not in the bulk data set), ingested

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