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Calamos Advisors LLC: BIIB position timeline

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

Calamos Advisors LLC held 35,925 BIIB shares at 2026-06-30 per its 13F-HR filed 2026-07-31.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 35,925 shares
    Change vs previous 13F +398 shares

    0.03% of the 13F portfolio, value $7,761,956.

    13F-HR 0001316507-26-000003 filed by Calamos Advisors LLC
    Filed (acceptance time not in the bulk data set), ingested

    • Calamos Advisors LLC: 34,879 shares
    • Calamos Wealth Management LLC: 1,046 shares

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

  2. period ended2026-03-31
    13F 35,527 shares
    Change vs previous 13F 0 shares

    0.03% of the 13F portfolio, value $6,513,165.

    13F-HR 0001316507-26-000002 filed by Calamos Advisors 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 35,527 shares
    Change vs previous 13F -1,443 shares

    0.03% of the 13F portfolio, value $6,252,397.

    13F-HR 0001316507-26-000001 filed by Calamos Advisors 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 36,970 shares
    Change vs previous 13F 0 shares

    0.02% of the 13F portfolio, value $5,178,758.

    13F-HR 0001316507-25-000003 filed by Calamos Advisors 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 36,970 shares
    Change vs previous 13F 0 shares

    0.02% of the 13F portfolio, value $4,643,062.

    13F-HR 0001085146-25-004696 filed by Calamos Advisors 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 36,970 shares
    Change vs previous 13F +412 shares

    0.02% of the 13F portfolio, value $5,058,975.

    13F-HR 0001085146-25-002415 filed by Calamos Advisors 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 36,558 shares
    Change vs previous 13F 0 shares

    0.03% of the 13F portfolio, value $5,590,449.

    13F-HR 0001085146-25-000482 filed by Calamos Advisors 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 36,558 shares
    Change vs previous 13F not available

    0.03% of the 13F portfolio, value $7,086,403.

    13F-HR 0001085146-24-005402 filed by Calamos Advisors LLC
    Filed (acceptance time not in the bulk data set), ingested

    • Calamos Advisors LLC: 36,558 shares
    • Calamos Wealth Management LLC: 0 shares

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