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BLAIR WILLIAM & CO/IL: CIEN position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of BLAIR WILLIAM & CO/IL on CIEN, newest first. How the timeline and the estimate are built.

BLAIR WILLIAM & CO/IL held 20,201 CIEN shares at 2026-06-30 per its 13F-HR filed 2026-08-11.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 20,201 shares
    Change vs previous 13F +706 shares

    0.03% of the 13F portfolio, value $9,909,930.

    13F-HR 0001104659-26-093821 filed by BLAIR WILLIAM & CO/IL
    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 19,495 shares
    Change vs previous 13F +922 shares

    0.02% of the 13F portfolio, value $7,568,519.

    13F-HR 0001104659-26-057897 filed by BLAIR WILLIAM & CO/IL
    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 18,573 shares
    Change vs previous 13F +63 shares

    0.01% of the 13F portfolio, value $4,343,735.

    13F-HR 0001104659-26-015563 filed by BLAIR WILLIAM & CO/IL
    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 18,510 shares
    Change vs previous 13F -3,510 shares

    0.01% of the 13F portfolio, value $2,696,394.

    13F-HR 0001104659-25-109927 filed by BLAIR WILLIAM & CO/IL
    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 22,020 shares
    Change vs previous 13F 0 shares

    <0.01% of the 13F portfolio, value $1,790,887.

    13F-HR 0001104659-25-070274 filed by BLAIR WILLIAM & CO/IL
    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 22,020 shares
    Change vs previous 13F -250 shares

    <0.01% of the 13F portfolio, value $1,330,669.

    13F-HR 0001104659-25-046545 filed by BLAIR WILLIAM & CO/IL
    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 22,270 shares
    Change vs previous 13F -3 shares

    0.01% of the 13F portfolio, value $1,888,719.

    13F-HR 0001104659-25-011872 filed by BLAIR WILLIAM & CO/IL
    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 22,273 shares
    Change vs previous 13F not available

    <0.01% of the 13F portfolio, value $1,371,794.

    13F-HR 0001104659-24-116499 filed by BLAIR WILLIAM & CO/IL
    Filed (acceptance time not in the bulk data set), ingested

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