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OBERWEIS ASSET MANAGEMENT INC/: AMSC position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of OBERWEIS ASSET MANAGEMENT INC/ on AMSC, newest first. How the timeline and the estimate are built.

OBERWEIS ASSET MANAGEMENT INC/ held 987,500 AMSC shares at 2026-06-30 per its 13F-HR filed 2026-08-14.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 987,500 shares
    Change vs previous 13F +137,600 shares

    0.85% of the 13F portfolio, value $40,991,125.

    13F-HR 0001213900-26-089777 filed by OBERWEIS ASSET MANAGEMENT INC/
    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 849,900 shares
    Change vs previous 13F +14,000 shares

    0.85% of the 13F portfolio, value $28,769,115.

    13F-HR 0001213900-26-057307 filed by OBERWEIS ASSET MANAGEMENT INC/
    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 835,900 shares
    Change vs previous 13F +170,200 shares

    0.88% of the 13F portfolio, value $24,057,202.

    13F-HR 0001213900-26-017101 filed by OBERWEIS ASSET MANAGEMENT INC/
    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 665,700 shares
    Change vs previous 13F -2,500 shares

    1.51% of the 13F portfolio, value $39,535,923.

    13F-HR 0001213900-25-111225 filed by OBERWEIS ASSET MANAGEMENT INC/
    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 668,200 shares
    Change vs previous 13F 0 shares

    1.07% of the 13F portfolio, value $24,516,258.

    13F-HR 0001213900-25-076460 filed by OBERWEIS ASSET MANAGEMENT INC/
    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 668,200 shares
    Change vs previous 13F +3,800 shares

    0.6% of the 13F portfolio, value $12,121,148.

    13F-HR 0001213900-25-043859 filed by OBERWEIS ASSET MANAGEMENT INC/
    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 664,400 shares
    Change vs previous 13F 0 shares

    0.77% of the 13F portfolio, value $16,364,172.

    13F-HR 0001213900-25-013939 filed by OBERWEIS ASSET MANAGEMENT INC/
    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 664,400 shares
    Change vs previous 13F not available

    0.8% of the 13F portfolio, value $15,679,840.

    13F-HR 0001213900-24-098012 filed by OBERWEIS ASSET MANAGEMENT INC/
    Filed (acceptance time not in the bulk data set), ingested

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