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Palo Alto Investors LP: BIIB position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Palo Alto Investors LP on BIIB, newest first. How the timeline and the estimate are built.

Palo Alto Investors LP held 140,279 BIIB shares at 2026-06-30 per its 13F-HR/A filed 2026-08-19.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F/A 140,279 shares
    Change vs previous 13F -440 shares

    4.19% of the 13F portfolio, value $30,308,681.

    13F-HR/A 0002073679-26-000102 filed by Palo Alto Investors LP
    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 140,719 shares
    Change vs previous 13F -42,852 shares

    3.95% of the 13F portfolio, value $25,798,014.

    13F-HR 0001306923-26-000004 filed by Palo Alto Investors LP
    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 183,571 shares
    Change vs previous 13F -2,090 shares

    4.5% of the 13F portfolio, value $32,306,660.

    13F-HR 0001306923-26-000002 filed by Palo Alto Investors LP
    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 185,661 shares
    Change vs previous 13F -20,098 shares

    4.81% of the 13F portfolio, value $26,007,393.

    13F-HR 0001306923-25-000019 filed by Palo Alto Investors LP
    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 205,759 shares
    Change vs previous 13F +836 shares

    5.5% of the 13F portfolio, value $25,841,273.

    13F-HR 0001306923-25-000016 filed by Palo Alto Investors LP
    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 204,923 shares
    Change vs previous 13F +14,775 shares

    5.34% of the 13F portfolio, value $28,041,663.

    13F-HR 0001306923-25-000014 filed by Palo Alto Investors LP
    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 190,148 shares
    Change vs previous 13F -38,768 shares

    4.51% of the 13F portfolio, value $29,077,432.

    13F-HR 0001306923-25-000010 filed by Palo Alto Investors LP
    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 228,916 shares
    Change vs previous 13F not available

    5.76% of the 13F portfolio, value $44,373,077.

    13F-HR 0001306923-24-000012 filed by Palo Alto Investors LP
    Filed (acceptance time not in the bulk data set), ingested

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