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DIMENSIONAL FUND ADVISORS LP: AMSC position timeline

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

DIMENSIONAL FUND ADVISORS LP held 645,991 AMSC 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 645,991 shares
    Change vs previous 13F -12,306 shares

    <0.01% of the 13F portfolio, value $26,809,456.

    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 658,297 shares
    Change vs previous 13F +118,044 shares

    <0.01% of the 13F portfolio, value $22,277,858.

    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 540,253 shares
    Change vs previous 13F +68,769 shares

    <0.01% of the 13F portfolio, value $15,549,050.

    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 471,484 shares
    Change vs previous 13F -9,269 shares

    0.01% of the 13F portfolio, value $28,006,294.

    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 480,753 shares
    Change vs previous 13F -187,399 shares

    <0.01% of the 13F portfolio, value $17,637,989.

    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 668,152 shares
    Change vs previous 13F +13,853 shares

    <0.01% of the 13F portfolio, value $12,122,422.

    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 654,299 shares
    Change vs previous 13F +46,354 shares

    <0.01% of the 13F portfolio, value $16,117,294.

    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 607,945 shares
    Change vs previous 13F not available

    <0.01% of the 13F portfolio, value $14,345,425.

    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).