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Rafferty Asset Management, LLC: BIIB position timeline

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

Rafferty Asset Management, LLC held 30,461 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 30,461 shares
    Change vs previous 13F -4,557 shares

    0.01% of the 13F portfolio, value $6,581,404.

    13F-HR 0001999371-26-017909 filed by Rafferty Asset Management, 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 35,018 shares
    Change vs previous 13F -13,541 shares

    0.03% of the 13F portfolio, value $6,419,850.

    13F-HR 0001999371-26-010796 filed by Rafferty Asset Management, 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 48,559 shares
    Change vs previous 13F -110,068 shares

    0.03% of the 13F portfolio, value $8,545,898.

    13F-HR 0001999371-26-003261 filed by Rafferty Asset Management, 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 158,627 shares
    Change vs previous 13F -21,813 shares

    0.07% of the 13F portfolio, value $22,220,470.

    13F-HR 0001999371-25-017439 filed by Rafferty Asset Management, 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 180,440 shares
    Change vs previous 13F -335 shares

    0.07% of the 13F portfolio, value $22,661,460.

    13F-HR 0001999371-25-011302 filed by Rafferty Asset Management, 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 180,775 shares
    Change vs previous 13F -8,745 shares

    0.11% of the 13F portfolio, value $24,737,251.

    13F-HR 0001999371-25-006071 filed by Rafferty Asset Management, 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 189,520 shares
    Change vs previous 13F +29,319 shares

    0.1% of the 13F portfolio, value $28,981,398.

    13F-HR 0001999371-25-001622 filed by Rafferty Asset Management, 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 160,201 shares
    Change vs previous 13F not available

    0.11% of the 13F portfolio, value $31,053,362.

    13F-HR 0001999371-24-014625 filed by Rafferty Asset Management, LLC
    Filed (acceptance time not in the bulk data set), ingested

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