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Portolan Capital Management, LLC: CSTL position timeline

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

Portolan Capital Management, LLC held 328,818 CSTL 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 328,818 shares
    Change vs previous 13F -1,021,465 shares

    0.29% of the 13F portfolio, value $7,842,309.

    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 1,350,283 shares
    Change vs previous 13F -379,180 shares

    1.76% of the 13F portfolio, value $33,149,448.

    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).

  3. period ended2025-12-31
    13F 1,729,463 shares
    Change vs previous 13F +214,352 shares

    3.6% of the 13F portfolio, value $67,276,111.

    13F-HR 0001104659-26-016304 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).

  4. period ended2025-09-30
    13F 1,515,111 shares
    Change vs previous 13F +25,539 shares

    1.87% of the 13F portfolio, value $34,499,077.

    13F-HR 0001104659-25-111284 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).

  5. period ended2025-06-30
    13F 1,489,572 shares
    Change vs previous 13F +224,349 shares

    1.91% of the 13F portfolio, value $30,417,060.

    13F-HR 0001104659-25-077571 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).

  6. period ended2025-03-31
    13F 1,265,223 shares
    Change vs previous 13F +488,644 shares

    1.93% of the 13F portfolio, value $25,329,764.

    13F-HR 0001104659-25-049320 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).

  7. period ended2024-12-31
    13F 776,579 shares
    Change vs previous 13F -479,049 shares

    1.39% of the 13F portfolio, value $20,695,830.

    13F-HR 0001104659-25-012988 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).

  8. period ended2024-09-30
    13F 1,255,628 shares
    Change vs previous 13F not available

    2.6% of the 13F portfolio, value $35,810,511.

    13F-HR 0001104659-24-118686 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).