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Rhenman & Partners Asset Management AB: BIIB position timeline

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

Rhenman & Partners Asset Management AB held 94,850 BIIB shares at 2026-06-30 per its 13F-HR filed 2026-08-13.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 94,850 shares
    Change vs previous 13F -14,250 shares

    1.93% of the 13F portfolio, value $20,493,291.

    13F-HR 0001213900-26-088652 filed by Rhenman & Partners Asset Management AB
    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 109,100 shares
    Change vs previous 13F +16,750 shares

    2.47% of the 13F portfolio, value $20,001,303.

    13F-HR 0001213900-26-056196 filed by Rhenman & Partners Asset Management AB
    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 92,350 shares
    Change vs previous 13F +37,350 shares

    1.52% of the 13F portfolio, value $16,252,677.

    13F-HR 0001213900-26-015821 filed by Rhenman & Partners Asset Management AB
    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 55,000 shares
    Change vs previous 13F +43,000 shares

    0.85% of the 13F portfolio, value $7,704,400.

    13F-HR 0001213900-25-109534 filed by Rhenman & Partners Asset Management AB
    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 12,000 shares
    Change vs previous 13F -37,500 shares

    0.19% of the 13F portfolio, value $1,507,080.

    13F-HR 0001213900-25-075249 filed by Rhenman & Partners Asset Management AB
    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 49,500 shares
    Change vs previous 13F -74,200 shares

    0.78% of the 13F portfolio, value $6,773,580.

    13F-HR 0001213900-25-042939 filed by Rhenman & Partners Asset Management AB
    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 123,700 shares
    Change vs previous 13F +56,600 shares

    1.94% of the 13F portfolio, value $18,916,204.

    13F-HR 0001213900-25-013150 filed by Rhenman & Partners Asset Management AB
    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 67,100 shares
    Change vs previous 13F not available

    1.06% of the 13F portfolio, value $13,006,664.

    13F-HR 0001213900-24-097092 filed by Rhenman & Partners Asset Management AB
    Filed (acceptance time not in the bulk data set), ingested

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