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WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC: MA position timeline

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

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC held 918,005 MA shares at 2026-06-30 per its 13F-HR filed 2026-08-12.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 918,005 shares
    Change vs previous 13F -142,646 shares

    1.42% of the 13F portfolio, value $471,487,500.

    13F-HR 0001644956-26-000023 filed by WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
    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 1,060,651 shares
    Change vs previous 13F -24,296 shares

    1.75% of the 13F portfolio, value $529,964,838.

    13F-HR 0001644956-26-000021 filed by WILLIAM BLAIR INVESTMENT MANAGEMENT, 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 1,084,947 shares
    Change vs previous 13F -20,398 shares

    1.73% of the 13F portfolio, value $619,374,340.

    13F-HR 0001644956-26-000007 filed by WILLIAM BLAIR INVESTMENT MANAGEMENT, 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 1,105,345 shares
    Change vs previous 13F -114,920 shares

    1.63% of the 13F portfolio, value $628,731,529.

    13F-HR 0001644956-25-000045 filed by WILLIAM BLAIR INVESTMENT MANAGEMENT, 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 1,220,265 shares
    Change vs previous 13F +4,951 shares

    1.82% of the 13F portfolio, value $685,715,836.

    13F-HR 0001644956-25-000032 filed by WILLIAM BLAIR INVESTMENT MANAGEMENT, 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 1,215,314 shares
    Change vs previous 13F -221,090 shares

    1.87% of the 13F portfolio, value $666,137,921.

    13F-HR 0001644956-25-000018 filed by WILLIAM BLAIR INVESTMENT MANAGEMENT, 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 1,436,404 shares
    Change vs previous 13F +6,685 shares

    1.85% of the 13F portfolio, value $756,367,159.

    13F-HR 0001644956-25-000002 filed by WILLIAM BLAIR INVESTMENT MANAGEMENT, 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 1,429,719 shares
    Change vs previous 13F not available

    1.74% of the 13F portfolio, value $705,995,050.

    13F-HR 0001644956-24-000009 filed by WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
    Filed (acceptance time not in the bulk data set), ingested

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