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PRIMECAP MANAGEMENT CO/CA/: STX position timeline

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

PRIMECAP MANAGEMENT CO/CA/ held 188,777 STX 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 188,777 shares
    Change vs previous 13F -41,555 shares

    0.11% of the 13F portfolio, value $182,169,805.

    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 230,332 shares
    Change vs previous 13F -153,950 shares

    0.07% of the 13F portfolio, value $90,234,864.

    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 384,282 shares
    Change vs previous 13F -270,275 shares

    0.08% of the 13F portfolio, value $105,827,420.

    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 654,557 shares
    Change vs previous 13F -328,650 shares

    0.12% of the 13F portfolio, value $154,514,726.

    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 983,207 shares
    Change vs previous 13F +152,752 shares

    0.11% of the 13F portfolio, value $141,906,268.

    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 830,455 shares
    Change vs previous 13F +68,300 shares

    0.06% of the 13F portfolio, value $70,547,156.

    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 762,155 shares
    Change vs previous 13F +160,735 shares

    0.05% of the 13F portfolio, value $65,781,602.

    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 601,420 shares
    Change vs previous 13F not available

    0.05% of the 13F portfolio, value $65,873,532.

    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).