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BLAIR WILLIAM & CO/IL: MRK position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of BLAIR WILLIAM & CO/IL on MRK, newest first. How the timeline and the estimate are built.

BLAIR WILLIAM & CO/IL held 920,715 MRK 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 920,715 shares
    Change vs previous 13F +18,926 shares

    0.31% of the 13F portfolio, value $118,311,927.

    13F-HR 0001104659-26-093821 filed by BLAIR WILLIAM & CO/IL
    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 901,789 shares
    Change vs previous 13F +67,765 shares

    0.31% of the 13F portfolio, value $108,476,224.

    13F-HR 0001104659-26-057897 filed by BLAIR WILLIAM & CO/IL
    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 834,024 shares
    Change vs previous 13F +21,658 shares

    0.24% of the 13F portfolio, value $87,789,368.

    13F-HR 0001104659-26-015563 filed by BLAIR WILLIAM & CO/IL
    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 812,366 shares
    Change vs previous 13F -60,101 shares

    0.18% of the 13F portfolio, value $68,181,868.

    13F-HR 0001104659-25-109927 filed by BLAIR WILLIAM & CO/IL
    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 872,467 shares
    Change vs previous 13F -68,932 shares

    0.19% of the 13F portfolio, value $69,064,483.

    13F-HR 0001104659-25-070274 filed by BLAIR WILLIAM & CO/IL
    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 941,399 shares
    Change vs previous 13F -67,564 shares

    0.25% of the 13F portfolio, value $84,499,950.

    13F-HR 0001104659-25-046545 filed by BLAIR WILLIAM & CO/IL
    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 1,008,963 shares
    Change vs previous 13F +6,634 shares

    0.29% of the 13F portfolio, value $100,371,645.

    13F-HR 0001104659-25-011872 filed by BLAIR WILLIAM & CO/IL
    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 1,002,329 shares
    Change vs previous 13F not available

    0.33% of the 13F portfolio, value $113,824,472.

    13F-HR 0001104659-24-116499 filed by BLAIR WILLIAM & CO/IL
    Filed (acceptance time not in the bulk data set), ingested

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