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Disclosery

Swiss National Bank: BIIB position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Swiss National Bank on BIIB, newest first. How the timeline and the estimate are built.

Swiss National Bank held 413,900 BIIB shares at 2026-06-30 per its 13F-HR filed 2026-08-11.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 413,900 shares
    Change vs previous 13F -16,700 shares

    0.05% of the 13F portfolio, value $89,427,234.

    13F-HR 0001582202-26-000007 filed by Swiss National Bank
    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 430,600 shares
    Change vs previous 13F +28,800 shares

    0.05% of the 13F portfolio, value $78,941,898.

    13F-HR 0001582202-26-000004 filed by Swiss National Bank
    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 401,800 shares
    Change vs previous 13F -20,600 shares

    0.04% of the 13F portfolio, value $70,712,782.

    13F-HR 0001582202-26-000002 filed by Swiss National Bank
    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 422,400 shares
    Change vs previous 13F -20,700 shares

    0.03% of the 13F portfolio, value $59,169,792.

    13F-HR 0001582202-25-000011 filed by Swiss National Bank
    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 443,100 shares
    Change vs previous 13F +32,100 shares

    0.03% of the 13F portfolio, value $55,648,929.

    13F-HR 0001582202-25-000007 filed by Swiss National Bank
    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 411,000 shares
    Change vs previous 13F -500 shares

    0.04% of the 13F portfolio, value $56,241,240.

    13F-HR 0001582202-25-000004 filed by Swiss National Bank
    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 411,500 shares
    Change vs previous 13F -20,600 shares

    0.04% of the 13F portfolio, value $62,926,580.

    13F-HR 0001582202-25-000002 filed by Swiss National Bank
    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 432,100 shares
    Change vs previous 13F not available

    0.05% of the 13F portfolio, value $83,758,264.

    13F-HR 0001582202-24-000011 filed by Swiss National Bank
    Filed (acceptance time not in the bulk data set), ingested

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