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PRIMECAP MANAGEMENT CO/CA/: WDC position timeline

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

PRIMECAP MANAGEMENT CO/CA/ held 516,440 WDC 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 516,440 shares
    Change vs previous 13F -60,770 shares

    0.2% of the 13F portfolio, value $329,860,556.

    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 577,210 shares
    Change vs previous 13F -176,330 shares

    0.12% of the 13F portfolio, value $156,129,533.

    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 753,540 shares
    Change vs previous 13F -211,530 shares

    0.1% of the 13F portfolio, value $129,812,337.

    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 965,070 shares
    Change vs previous 13F -107,020 shares

    0.09% of the 13F portfolio, value $115,866,304.

    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 1,072,090 shares
    Change vs previous 13F -49,465 shares

    0.05% of the 13F portfolio, value $68,603,041.

    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 1,121,555 shares
    Change vs previous 13F -37,060 shares

    0.04% of the 13F portfolio, value $45,344,470.

    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 1,158,615 shares
    Change vs previous 13F -2,820 shares

    0.05% of the 13F portfolio, value $69,088,214.

    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 1,161,435 shares
    Change vs previous 13F not available

    0.06% of the 13F portfolio, value $79,314,398.

    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).