Skip to content
Disclosery

PRIMECAP MANAGEMENT CO/CA/: BSX position timeline

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

PRIMECAP MANAGEMENT CO/CA/ held 50,520,914 BSX 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 50,520,914 shares
    Change vs previous 13F +17,991,140 shares

    1.28% of the 13F portfolio, value $2,156,232,608.

    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 32,529,774 shares
    Change vs previous 13F +1,433,590 shares

    1.61% of the 13F portfolio, value $2,041,243,323.

    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 31,096,184 shares
    Change vs previous 13F -2,005,910 shares

    2.24% of the 13F portfolio, value $2,965,021,147.

    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 33,102,094 shares
    Change vs previous 13F -1,560,628 shares

    2.48% of the 13F portfolio, value $3,231,757,439.

    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 34,662,722 shares
    Change vs previous 13F -1,834,224 shares

    2.95% of the 13F portfolio, value $3,723,122,970.

    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 36,496,946 shares
    Change vs previous 13F -432,720 shares

    3.04% of the 13F portfolio, value $3,681,811,912.

    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 36,929,666 shares
    Change vs previous 13F -896,834 shares

    2.55% of the 13F portfolio, value $3,298,557,768.

    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 37,826,500 shares
    Change vs previous 13F not available

    2.33% of the 13F portfolio, value $3,169,860,699.

    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).