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PRIMECAP MANAGEMENT CO/CA/: ACM position timeline

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

PRIMECAP MANAGEMENT CO/CA/ held 8,787,043 ACM 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 8,787,043 shares
    Change vs previous 13F +139,970 shares

    0.36% of the 13F portfolio, value $613,335,602.

    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 8,647,073 shares
    Change vs previous 13F -20,210 shares

    0.58% of the 13F portfolio, value $733,444,733.

    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 8,667,283 shares
    Change vs previous 13F -211,080 shares

    0.63% of the 13F portfolio, value $826,252,089.

    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 8,878,363 shares
    Change vs previous 13F -684,889 shares

    0.89% of the 13F portfolio, value $1,158,360,021.

    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 9,563,252 shares
    Change vs previous 13F -585,478 shares

    0.86% of the 13F portfolio, value $1,079,308,621.

    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 10,148,730 shares
    Change vs previous 13F -1,232,852 shares

    0.78% of the 13F portfolio, value $941,091,733.

    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 11,381,582 shares
    Change vs previous 13F -1,129,625 shares

    0.94% of the 13F portfolio, value $1,215,780,592.

    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 12,511,207 shares
    Change vs previous 13F not available

    0.95% of the 13F portfolio, value $1,292,032,452.

    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).