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GW&K Investment Management, LLC: ATMU position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of GW&K Investment Management, LLC on ATMU, newest first. How the timeline and the estimate are built.

GW&K Investment Management, LLC held 390,392 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 390,392 shares
    Change vs previous 13F -48,807 shares

    0.16% of the 13F portfolio, value $19,906,000.

    13F-HR 0001082917-26-000003 filed by GW&K 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 439,199 shares
    Change vs previous 13F -43,483 shares

    0.22% of the 13F portfolio, value $24,933,000.

    13F-HR 0001082917-26-000002 filed by GW&K 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 482,682 shares
    Change vs previous 13F +34,269 shares

    0.22% of the 13F portfolio, value $25,056,000.

    13F-HR 0001082917-26-000001 filed by GW&K 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 448,413 shares
    Change vs previous 13F -14,362 shares

    0.18% of the 13F portfolio, value $20,219,000.

    13F-HR 0001082917-25-000007 filed by GW&K 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 462,775 shares
    Change vs previous 13F -4,950 shares

    0.15% of the 13F portfolio, value $16,854,000.

    13F-HR 0001082917-25-000004 filed by GW&K 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 467,725 shares
    Change vs previous 13F +9,207 shares

    0.16% of the 13F portfolio, value $17,180,000.

    13F-HR 0001082917-25-000003 filed by GW&K 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 458,518 shares
    Change vs previous 13F +22,100 shares

    0.15% of the 13F portfolio, value $17,965,000.

    13F-HR 0001082917-25-000001 filed by GW&K 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 436,418 shares
    Change vs previous 13F not available

    0.14% of the 13F portfolio, value $16,379,000.

    13F-HR 0001082917-24-000006 filed by GW&K Investment Management, LLC
    Filed (acceptance time not in the bulk data set), ingested

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