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BLAIR WILLIAM & CO/IL: ATO position timeline

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

BLAIR WILLIAM & CO/IL held 14,214 ATO 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 14,214 shares
    Change vs previous 13F +7,927 shares

    0.01% of the 13F portfolio, value $2,448,697.

    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 6,287 shares
    Change vs previous 13F +3,679 shares

    <0.01% of the 13F portfolio, value $1,161,247.

    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 2,608 shares
    Change vs previous 13F +462 shares

    <0.01% of the 13F portfolio, value $437,158.

    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 2,146 shares
    Change vs previous 13F +176 shares

    <0.01% of the 13F portfolio, value $366,500.

    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 1,970 shares
    Change vs previous 13F +152 shares

    <0.01% of the 13F portfolio, value $303,652.

    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 1,818 shares
    Change vs previous 13F -1,317 shares

    <0.01% of the 13F portfolio, value $281,047.

    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 3,135 shares
    Change vs previous 13F +281 shares

    <0.01% of the 13F portfolio, value $436,575.

    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 2,854 shares
    Change vs previous 13F not available

    <0.01% of the 13F portfolio, value $395,919.

    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).