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FRED ALGER MANAGEMENT, LLC: BIIB position timeline

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

FRED ALGER MANAGEMENT, LLC held 788,307 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 788,307 shares
    Change vs previous 13F +55,113 shares

    0.57% of the 13F portfolio, value $170,321,610.

    13F-HR 0001193125-26-352250 filed by FRED ALGER 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 733,194 shares
    Change vs previous 13F -65,580 shares

    0.59% of the 13F portfolio, value $134,416,456.

    13F-HR 0001193125-26-226659 filed by FRED ALGER 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 798,774 shares
    Change vs previous 13F +796,735 shares

    0.55% of the 13F portfolio, value $140,576,236.

    13F-HR 0001193125-26-052991 filed by FRED ALGER 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 2,039 shares
    Change vs previous 13F +2,039 shares

    <0.01% of the 13F portfolio, value $285,623.

    13F-HR 0001193125-25-282909 filed by FRED ALGER 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 0 shares
    Change vs previous 13F -12,159 shares

    13F-HR 0000950123-25-008360 filed by FRED ALGER MANAGEMENT, LLC
    Filed (acceptance time not in the bulk data set), ingested

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

    Exited: the 13F for this period no longer lists the position.

  6. period ended2025-03-31
    13F 12,159 shares
    Change vs previous 13F not available

    0.01% of the 13F portfolio, value $1,663,838.

    13F-HR 0000950123-25-005777 filed by FRED ALGER MANAGEMENT, LLC
    Filed (acceptance time not in the bulk data set), ingested

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