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CITADEL ADVISORS LLC: BIIB position timeline

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

CITADEL ADVISORS LLC held 418,356 BIIB shares at 2026-06-30 per its 13F-HR/A filed 2026-09-02.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F/A 418,356 shares
    Change vs previous 13F +280,263 shares

    0.05% of the 13F portfolio, value $90,389,997.

    13F-HR/A 0001104659-26-104387 filed by CITADEL ADVISORS LLC
    Accepted , ingested

  2. period ended2026-03-31
    13F 138,093 shares
    Change vs previous 13F +97,669 shares

    0.02% of the 13F portfolio, value $25,316,590.

    13F-HR 0001104659-26-062477 filed by CITADEL 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 40,424 shares
    Change vs previous 13F -332,304 shares

    <0.01% of the 13F portfolio, value $7,114,220.

    13F-HR 0001104659-26-016408 filed by CITADEL 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 372,728 shares
    Change vs previous 13F -235,862 shares

    0.04% of the 13F portfolio, value $52,211,738.

    13F-HR 0001104659-25-112514 filed by CITADEL 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 608,590 shares
    Change vs previous 13F +66,826 shares

    0.07% of the 13F portfolio, value $76,432,818.

    13F-HR 0001104659-25-078555 filed by CITADEL 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 541,764 shares
    Change vs previous 13F +388,104 shares

    0.07% of the 13F portfolio, value $74,134,986.

    13F-HR 0000950123-25-005687 filed by CITADEL 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 153,660 shares
    Change vs previous 13F -218,706 shares

    0.02% of the 13F portfolio, value $23,497,687.

    13F-HR 0000950123-25-002739 filed by CITADEL 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 372,366 shares
    Change vs previous 13F not available

    0.08% of the 13F portfolio, value $72,179,426.

    13F-HR 0000950123-24-011767 filed by CITADEL ADVISORS LLC
    Filed (acceptance time not in the bulk data set), ingested

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