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Disclosery

Driehaus Capital Management LLC: AMSC position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Driehaus Capital Management LLC on AMSC, newest first. How the timeline and the estimate are built.

Driehaus Capital Management LLC held 0 AMSC shares at 2026-03-31 per its 13F-HR filed 2026-05-15.

the latest 13F is the newest step

  1. period ended2026-03-31
    13F 0 shares
    Change vs previous 13F -499,984 shares

    13F-HR 0000938206-26-000031 filed by Driehaus Capital Management LLC
    Filed (acceptance time not in the bulk data set), ingested

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

    Exited: the 13F for this period no longer lists the position.

  2. period ended2025-12-31
    13F 499,984 shares
    Change vs previous 13F -718,960 shares

    0.1% of the 13F portfolio, value $14,389,540.

    13F-HR 0000938206-26-000018 filed by Driehaus Capital 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 ended2025-09-30
    13F 1,218,944 shares
    Change vs previous 13F +379,097 shares

    0.52% of the 13F portfolio, value $72,393,084.

    13F-HR 0000938206-25-000056 filed by Driehaus Capital 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 ended2025-06-30
    13F 839,847 shares
    Change vs previous 13F +4 shares

    0.25% of the 13F portfolio, value $30,813,986.

    13F-HR 0000938206-25-000037 filed by Driehaus Capital 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 ended2025-03-31
    13F 839,843 shares
    Change vs previous 13F -102,855 shares

    0.15% of the 13F portfolio, value $15,234,752.

    13F-HR 0000938206-25-000012 filed by Driehaus Capital 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 ended2024-12-31
    13F 942,698 shares
    Change vs previous 13F +143,936 shares

    0.19% of the 13F portfolio, value $23,218,652.

    13F-HR 0000938206-25-000009 filed by Driehaus Capital 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 ended2024-09-30
    13F 798,762 shares
    Change vs previous 13F not available

    0.16% of the 13F portfolio, value $18,850,783.

    13F-HR 0000938206-24-000037 filed by Driehaus Capital Management LLC
    Filed (acceptance time not in the bulk data set), ingested

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