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PRIMECAP MANAGEMENT CO/CA/: AMTM position timeline

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

PRIMECAP MANAGEMENT CO/CA/ held 12,285,504 AMTM 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 12,285,504 shares
    Change vs previous 13F +200,210 shares

    0.15% of the 13F portfolio, value $253,941,367.

    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 12,085,294 shares
    Change vs previous 13F -41,633 shares

    0.25% of the 13F portfolio, value $315,184,494.

    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 12,126,927 shares
    Change vs previous 13F +208,341 shares

    0.27% of the 13F portfolio, value $351,680,883.

    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 11,918,586 shares
    Change vs previous 13F -112,070 shares

    0.22% of the 13F portfolio, value $285,450,135.

    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 12,030,656 shares
    Change vs previous 13F +1,969,067 shares

    0.23% of the 13F portfolio, value $284,043,790.

    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 10,061,589 shares
    Change vs previous 13F +3,647,210 shares

    0.15% of the 13F portfolio, value $183,120,920.

    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 6,414,379 shares
    Change vs previous 13F +1,143,097 shares

    0.1% of the 13F portfolio, value $134,894,391.

    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 5,271,282 shares
    Change vs previous 13F not available

    0.12% of the 13F portfolio, value $169,998,847.

    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).