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Disclosery

Portolan Capital Management, LLC: AMSC position timeline

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

Portolan Capital Management, LLC held 29,314 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 29,314 shares
    Change vs previous 13F -266,322 shares

    0.05% of the 13F portfolio, value $1,216,824.

    13F-HR 0001104659-26-096980 filed by Portolan Capital Management, LLC
    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 295,636 shares
    Change vs previous 13F not available

    0.53% of the 13F portfolio, value $10,007,279.

    13F-HR 0001104659-26-062488 filed by Portolan Capital Management, LLC
    Filed (acceptance time not in the bulk data set), ingested

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