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PRIMECAP MANAGEMENT CO/CA/: GLW position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of PRIMECAP MANAGEMENT CO/CA/ on GLW, newest first. How the timeline and the estimate are built.

PRIMECAP MANAGEMENT CO/CA/ held 4,131,872 GLW 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 4,131,872 shares
    Change vs previous 13F -2,900 shares

    0.62% of the 13F portfolio, value $1,055,404,065.

    13F-HR 0000763212-26-000028 filed by PRIMECAP MANAGEMENT CO/CA/
    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 4,134,772 shares
    Change vs previous 13F -3,400 shares

    0.44% of the 13F portfolio, value $562,204,949.

    13F-HR 0000763212-26-000016 filed by PRIMECAP MANAGEMENT CO/CA/
    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 4,138,172 shares
    Change vs previous 13F -462,200 shares

    0.27% of the 13F portfolio, value $362,338,340.

    13F-HR 0000763212-26-000012 filed by PRIMECAP MANAGEMENT CO/CA/
    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 4,600,372 shares
    Change vs previous 13F -384,000 shares

    0.29% of the 13F portfolio, value $377,368,516.

    13F-HR 0000763212-25-000005 filed by PRIMECAP MANAGEMENT CO/CA/
    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 4,984,372 shares
    Change vs previous 13F -3,267,400 shares

    0.21% of the 13F portfolio, value $262,128,124.

    13F-HR 0001085146-25-004804 filed by PRIMECAP MANAGEMENT CO/CA/
    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 8,251,772 shares
    Change vs previous 13F -73,900 shares

    0.31% of the 13F portfolio, value $377,766,122.

    13F-HR 0001085146-25-002901 filed by PRIMECAP MANAGEMENT CO/CA/
    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 8,325,672 shares
    Change vs previous 13F -232,847 shares

    0.31% of the 13F portfolio, value $395,635,933.

    13F-HR 0001085146-25-000946 filed by PRIMECAP MANAGEMENT CO/CA/
    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 8,558,519 shares
    Change vs previous 13F not available

    0.28% of the 13F portfolio, value $386,417,134.

    13F-HR 0001085146-24-005460 filed by PRIMECAP MANAGEMENT CO/CA/
    Filed (acceptance time not in the bulk data set), ingested

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