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DIMENSIONAL FUND ADVISORS LP: ATI position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of DIMENSIONAL FUND ADVISORS LP on ATI, newest first. How the timeline and the estimate are built.

DIMENSIONAL FUND ADVISORS LP held 1,160,274 ATI 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 1,160,274 shares
    Change vs previous 13F -206,530 shares

    0.04% of the 13F portfolio, value $228,696,927.

    13F-HR 0000354204-26-000866 filed by DIMENSIONAL FUND ADVISORS LP
    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 1,366,804 shares
    Change vs previous 13F -759,172 shares

    0.04% of the 13F portfolio, value $198,718,554.

    13F-HR 0000354204-26-000581 filed by DIMENSIONAL FUND ADVISORS LP
    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 2,125,976 shares
    Change vs previous 13F -16,024 shares

    0.05% of the 13F portfolio, value $243,988,688.

    13F-HR 0000354204-26-000347 filed by DIMENSIONAL FUND ADVISORS LP
    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 2,142,000 shares
    Change vs previous 13F +142,696 shares

    0.04% of the 13F portfolio, value $174,210,005.

    13F-HR 0000354204-25-001337 filed by DIMENSIONAL FUND ADVISORS LP
    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 1,999,304 shares
    Change vs previous 13F -618,010 shares

    0.04% of the 13F portfolio, value $172,629,742.

    13F-HR 0000354204-25-001097 filed by DIMENSIONAL FUND ADVISORS LP
    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 2,617,314 shares
    Change vs previous 13F +59,811 shares

    0.03% of the 13F portfolio, value $136,163,581.

    13F-HR 0000354204-25-000866 filed by DIMENSIONAL FUND ADVISORS LP
    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 2,557,503 shares
    Change vs previous 13F +82,189 shares

    0.03% of the 13F portfolio, value $140,765,355.

    13F-HR 0000354204-25-000528 filed by DIMENSIONAL FUND ADVISORS LP
    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 2,475,314 shares
    Change vs previous 13F not available

    0.04% of the 13F portfolio, value $165,618,521.

    13F-HR 0000354204-24-004773 filed by DIMENSIONAL FUND ADVISORS LP
    Filed (acceptance time not in the bulk data set), ingested

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