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PRIMECAP MANAGEMENT CO/CA/: ARM position timeline

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

PRIMECAP MANAGEMENT CO/CA/ held 233,680 ARM 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 233,680 shares
    Change vs previous 13F -200 shares

    0.05% of the 13F portfolio, value $82,855,917.

    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 233,880 shares
    Change vs previous 13F 0 shares

    0.03% of the 13F portfolio, value $35,381,367.

    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 233,880 shares
    Change vs previous 13F -1,460 shares

    0.02% of the 13F portfolio, value $25,565,423.

    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 235,340 shares
    Change vs previous 13F -250 shares

    0.03% of the 13F portfolio, value $33,298,256.

    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 235,590 shares
    Change vs previous 13F -38,020 shares

    0.03% of the 13F portfolio, value $38,104,327.

    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 273,610 shares
    Change vs previous 13F -273,010 shares

    0.02% of the 13F portfolio, value $29,218,812.

    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 546,620 shares
    Change vs previous 13F -22,870 shares

    0.05% of the 13F portfolio, value $67,431,043.

    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 569,490 shares
    Change vs previous 13F not available

    0.06% of the 13F portfolio, value $81,442,765.

    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).