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BLAIR WILLIAM & CO/IL: MA position timeline

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

BLAIR WILLIAM & CO/IL held 842,350 MA 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 842,350 shares
    Change vs previous 13F -81,055 shares

    1.13% of the 13F portfolio, value $432,630,792.

    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 923,405 shares
    Change vs previous 13F -31,783 shares

    1.32% of the 13F portfolio, value $461,388,665.

    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 955,188 shares
    Change vs previous 13F -21,409 shares

    1.46% of the 13F portfolio, value $545,297,918.

    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 976,597 shares
    Change vs previous 13F -30,726 shares

    1.48% of the 13F portfolio, value $555,497,975.

    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 1,007,323 shares
    Change vs previous 13F -13,372 shares

    1.57% of the 13F portfolio, value $566,054,989.

    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 1,020,695 shares
    Change vs previous 13F -18,996 shares

    1.69% of the 13F portfolio, value $559,463,516.

    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 1,039,691 shares
    Change vs previous 13F -1,458 shares

    1.59% of the 13F portfolio, value $547,469,969.

    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 1,041,149 shares
    Change vs previous 13F not available

    1.51% of the 13F portfolio, value $514,119,344.

    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).