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Disclosery

D. E. Shaw & Co., Inc.: BIIB position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of D. E. Shaw & Co., Inc. on BIIB, newest first. How the timeline and the estimate are built.

D. E. Shaw & Co., Inc. held 74,438 BIIB shares at 2026-06-30 per its 13F-HR filed 2026-08-14.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 74,438 shares
    Change vs previous 13F +74,438 shares

    0.01% of the 13F portfolio, value $16,083,074.

    13F-HR 0001104659-26-097217 filed by D. E. Shaw & Co., Inc.
    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 0 shares
    Change vs previous 13F -53,754 shares

    13F-HR 0001104659-26-062472 filed by D. E. Shaw & Co., Inc.
    Filed (acceptance time not in the bulk data set), ingested

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

    Exited: the 13F for this period no longer lists the position.

  3. period ended2025-12-31
    13F 53,754 shares
    Change vs previous 13F -424,170 shares

    0.01% of the 13F portfolio, value $9,460,166.

    13F-HR 0001104659-26-016332 filed by D. E. Shaw & Co., Inc.
    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 477,924 shares
    Change vs previous 13F -888,283 shares

    0.05% of the 13F portfolio, value $66,947,594.

    13F-HR 0001104659-25-112505 filed by D. E. Shaw & Co., Inc.
    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 1,366,207 shares
    Change vs previous 13F -219,365 shares

    0.17% of the 13F portfolio, value $171,581,937.

    13F-HR 0001104659-25-078542 filed by D. E. Shaw & Co., Inc.
    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 1,585,572 shares
    Change vs previous 13F -24,327 shares

    0.26% of the 13F portfolio, value $216,969,673.

    13F-HR 0001104659-25-049422 filed by D. E. Shaw & Co., Inc.
    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 1,609,899 shares
    Change vs previous 13F +1,174,960 shares

    0.27% of the 13F portfolio, value $246,185,755.

    13F-HR 0001104659-25-014028 filed by D. E. Shaw & Co., Inc.
    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 434,939 shares
    Change vs previous 13F not available

    0.11% of the 13F portfolio, value $84,308,576.

    13F-HR 0001104659-24-119021 filed by D. E. Shaw & Co., Inc.
    Filed (acceptance time not in the bulk data set), ingested

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