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BlackRock, Inc.: CCOI position timeline

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

BlackRock, Inc. held 7,376,384 CCOI shares at 2026-06-30 per its 13F-HR filed 2026-08-07, and reported 3,932,477 shares, 7.7%, in a 13G/A filed 2026-10-05.

Estimated current stake: 3,932,477 shares, 7.7% of the class

Estimated from 13G/A of 2026-10-05. As of 2026-09-30, 13G/A 0002012383-26-003317.

Shares are the reporting group's aggregate and may include entities that do not file a 13F.

Percent of portfolio stays on the 13F for 2026-06-30.

  1. event date2026-09-30
    13G/A 3,932,477 shares
    Share basis changed not comparable

    7.7% of the class. Different basis (group aggregate from 13G/A).

    13G/A 0002012383-26-003317 filed by BlackRock, Inc.
    Accepted , ingested

    A 13D/G states the aggregate of its reporting persons, which may include entities that do not file a 13F.

  2. period ended2026-06-30
    13F 7,376,384 shares
    Change vs previous 13F +301,012 shares

    <0.01% of the 13F portfolio, value $102,384,215.

    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).

  3. period ended2026-03-31
    13F 7,075,372 shares
    Change vs previous 13F -115,645 shares

    <0.01% of the 13F portfolio, value $133,300,018.

    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).

  4. period ended2025-12-31
    13F 7,191,017 shares
    Change vs previous 13F +298,921 shares

    <0.01% of the 13F portfolio, value $155,038,337.

    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).

  5. period ended2025-09-30
    13F 6,892,096 shares
    Change vs previous 13F +411,552 shares

    <0.01% of the 13F portfolio, value $264,311,893.

    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).

  6. period ended2025-06-30
    13F 6,480,544 shares
    Change vs previous 13F -126,117 shares

    0.01% of the 13F portfolio, value $312,427,031.

    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).

  7. period ended2025-03-31
    13F 6,606,661 shares
    Change vs previous 13F -189,997 shares

    0.01% of the 13F portfolio, value $405,054,366.

    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).

  8. period ended2024-12-31
    13F 6,796,658 shares
    Change vs previous 13F -77,931 shares

    0.01% of the 13F portfolio, value $523,818,450.

    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).

  9. period ended2024-09-30
    13F 6,874,589 shares
    Change vs previous 13F not available

    0.01% of the 13F portfolio, value $521,918,798.

    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).