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Disclosery

BlackRock, Inc.: CIEN position timeline

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

BlackRock, Inc. held 12,718,494 CIEN shares at 2026-06-30 per its 13F-HR filed 2026-08-07.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 12,718,494 shares
    Change vs previous 13F -655,293 shares

    0.09% of the 13F portfolio, value $6,239,184,546.

    13F-HR 0002012383-26-003238 filed by BlackRock, Inc.
    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 13,373,787 shares
    Change vs previous 13F -3,295,043 shares

    0.09% of the 13F portfolio, value $5,192,105,090.

    13F-HR 0002012383-26-001841 filed by BlackRock, Inc.
    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 16,668,830 shares
    Change vs previous 13F +1,072,719 shares

    0.07% of the 13F portfolio, value $3,898,339,156.

    13F-HR 0002012383-26-000920 filed by BlackRock, Inc.
    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 15,596,111 shares
    Change vs previous 13F -1,471,087 shares

    0.04% of the 13F portfolio, value $2,271,885,416.

    13F-HR 0002012383-25-002949 filed by BlackRock, Inc.
    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 17,067,198 shares
    Change vs previous 13F +27,897 shares

    0.03% of the 13F portfolio, value $1,388,075,215.

    13F-HR 0001060021-25-000120 filed by BlackRock, Inc.
    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 17,039,301 shares
    Change vs previous 13F -62,339 shares

    0.02% of the 13F portfolio, value $1,029,684,962.

    13F-HR 0001576419-25-000869 filed by BlackRock, Inc.
    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 17,101,640 shares
    Change vs previous 13F +950,030 shares

    0.03% of the 13F portfolio, value $1,450,390,046.

    13F-HR 0001060021-25-000002 filed by BlackRock, Inc.
    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 16,151,610 shares
    Change vs previous 13F not available

    0.02% of the 13F portfolio, value $994,777,660.

    13F-HR 0001426459-24-000006 filed by BlackRock, Inc.
    Filed (acceptance time not in the bulk data set), ingested

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