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PRIMECAP MANAGEMENT CO/CA/: MU position timeline

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

PRIMECAP MANAGEMENT CO/CA/ held 19,217,236 MU 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 19,217,236 shares
    Change vs previous 13F -2,656,968 shares

    13.12% of the 13F portfolio, value $22,182,263,342.

    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 21,874,204 shares
    Change vs previous 13F -2,920,732 shares

    5.82% of the 13F portfolio, value $7,389,981,079.

    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 24,794,936 shares
    Change vs previous 13F -4,860,499 shares

    5.36% of the 13F portfolio, value $7,076,722,684.

    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 29,655,435 shares
    Change vs previous 13F -1,810,441 shares

    3.8% of the 13F portfolio, value $4,961,947,552.

    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 31,465,876 shares
    Change vs previous 13F -5,814,892 shares

    3.07% of the 13F portfolio, value $3,878,169,220.

    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 37,280,768 shares
    Change vs previous 13F -315,693 shares

    2.68% of the 13F portfolio, value $3,239,325,935.

    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 37,596,461 shares
    Change vs previous 13F -35,399 shares

    2.45% of the 13F portfolio, value $3,164,118,158.

    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 37,631,860 shares
    Change vs previous 13F not available

    2.87% of the 13F portfolio, value $3,902,800,201.

    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).