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WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC: ATMU position timeline

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

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC held 405,168 ATMU 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 405,168 shares
    Change vs previous 13F -20,904 shares

    0.06% of the 13F portfolio, value $20,659,516.

    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 426,072 shares
    Change vs previous 13F -255,900 shares

    0.08% of the 13F portfolio, value $24,188,107.

    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 681,972 shares
    Change vs previous 13F -69,785 shares

    0.1% of the 13F portfolio, value $35,401,167.

    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 751,757 shares
    Change vs previous 13F -45,526 shares

    0.09% of the 13F portfolio, value $33,896,723.

    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 797,283 shares
    Change vs previous 13F -62,808 shares

    0.08% of the 13F portfolio, value $29,037,047.

    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 860,091 shares
    Change vs previous 13F not available

    0.09% of the 13F portfolio, value $31,591,142.

    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).