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Disclosery

Portolan Capital Management, LLC: CIEN position timeline

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

Portolan Capital Management, LLC held 15,272 CIEN 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 15,272 shares
    Change vs previous 13F -3,194 shares

    0.28% of the 13F portfolio, value $7,491,832.

    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 18,466 shares
    Change vs previous 13F -38,015 shares

    0.38% of the 13F portfolio, value $7,169,055.

    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 56,481 shares
    Change vs previous 13F -32,305 shares

    0.71% of the 13F portfolio, value $13,209,211.

    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 88,786 shares
    Change vs previous 13F not available

    0.7% of the 13F portfolio, value $12,933,457.

    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).