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BlackRock, Inc.: CMCSA position timeline

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

BlackRock, Inc. held 313,212,228 CMCSA 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 313,212,228 shares
    Change vs previous 13F -1,773,537 shares

    0.11% of the 13F portfolio, value $7,689,360,213.

    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 314,985,765 shares
    Change vs previous 13F -797,866 shares

    0.16% of the 13F portfolio, value $9,043,241,311.

    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 315,783,631 shares
    Change vs previous 13F -5,836,182 shares

    0.16% of the 13F portfolio, value $9,438,772,737.

    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 321,619,813 shares
    Change vs previous 13F +19,581,123 shares

    0.18% of the 13F portfolio, value $10,105,294,511.

    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 302,038,690 shares
    Change vs previous 13F -7,864,081 shares

    0.21% of the 13F portfolio, value $10,779,760,857.

    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 309,902,771 shares
    Change vs previous 13F +8,368,508 shares

    0.24% of the 13F portfolio, value $11,435,412,279.

    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 301,534,263 shares
    Change vs previous 13F -1,031,857 shares

    0.23% of the 13F portfolio, value $11,316,580,918.

    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 302,566,120 shares
    Change vs previous 13F not available

    0.27% of the 13F portfolio, value $12,638,186,829.

    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).