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T. Rowe Price Investment Management, Inc.: BIIB position timeline

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

T. Rowe Price Investment Management, Inc. held 113,873 BIIB shares at 2026-06-30 per its 13F-HR filed 2026-08-14.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 113,873 shares
    Change vs previous 13F -1,047,116 shares

    0.02% of the 13F portfolio, value $24,604,000.

    13F-HR 0001897612-26-000578 filed by T. Rowe Price Investment Management, 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 1,160,989 shares
    Change vs previous 13F -9,918 shares

    0.15% of the 13F portfolio, value $212,845,000.

    13F-HR 0001897612-26-000460 filed by T. Rowe Price Investment Management, 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/A 1,170,907 shares
    Change vs previous 13F +103,425 shares

    0.13% of the 13F portfolio, value $206,068,000.

    13F-HR/A 0001897612-26-000299 filed by T. Rowe Price Investment Management, 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 1,067,482 shares
    Change vs previous 13F -326,994 shares

    0.09% of the 13F portfolio, value $149,533,000.

    13F-HR 0001897612-25-000511 filed by T. Rowe Price Investment Management, 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 1,394,476 shares
    Change vs previous 13F -1,265,814 shares

    0.11% of the 13F portfolio, value $175,133,000.

    13F-HR 0000080255-25-000548 filed by T. Rowe Price Investment Management, 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 2,660,290 shares
    Change vs previous 13F -439,496 shares

    0.24% of the 13F portfolio, value $364,035,000.

    13F-HR 0000080255-25-000283 filed by T. Rowe Price Investment Management, 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 3,099,786 shares
    Change vs previous 13F -1,156,500 shares

    0.29% of the 13F portfolio, value $474,020,000.

    13F-HR 0000080255-25-000217 filed by T. Rowe Price Investment Management, 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 4,256,286 shares
    Change vs previous 13F not available

    0.5% of the 13F portfolio, value $825,039,000.

    13F-HR 0001897612-24-002015 filed by T. Rowe Price Investment Management, Inc.
    Filed (acceptance time not in the bulk data set), ingested

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