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Disclosery

Weiss Asset Management LP: CIEN position timeline

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

Weiss Asset Management LP held 2,481 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 2,481 shares
    Change vs previous 13F +2,481 shares

    0.01% of the 13F portfolio, value $1,217,079.

    13F-HR 0001357550-26-000029 filed by Weiss Asset Management LP
    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/A 0 shares
    Change vs previous 13F -17,740 shares

    13F-HR 0001357550-26-000023 filed by Weiss Asset Management LP
    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.

  3. period ended2025-12-31
    13F/A 17,740 shares
    Change vs previous 13F -6,663 shares

    0.06% of the 13F portfolio, value $4,148,854.

    13F-HR 0001357550-26-000011 filed by Weiss Asset Management LP
    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/A 24,403 shares
    Change vs previous 13F -15,356 shares

    0.05% of the 13F portfolio, value $3,554,785.

    13F-HR 0001357550-25-000038 filed by Weiss Asset Management LP
    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/A 39,759 shares
    Change vs previous 13F +1,869 shares

    0.05% of the 13F portfolio, value $3,233,599.

    13F-HR 0001357550-25-000027 filed by Weiss Asset Management LP
    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/A 37,890 shares
    Change vs previous 13F +37,890 shares

    0.06% of the 13F portfolio, value $2,289,693.

    13F-HR 0001357550-25-000020 filed by Weiss Asset Management LP
    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/A 0 shares
    Change vs previous 13F not available

    13F-HR 0001357550-24-000029 filed by Weiss Asset Management LP
    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.