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PRIMECAP MANAGEMENT CO/CA/: WAT position timeline

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

PRIMECAP MANAGEMENT CO/CA/ held 38,647 WAT 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 38,647 shares
    Change vs previous 13F -200 shares

    0.01% of the 13F portfolio, value $14,494,170.

    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 38,847 shares
    Change vs previous 13F -200 shares

    0.01% of the 13F portfolio, value $11,568,637.

    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 39,047 shares
    Change vs previous 13F -9,520 shares

    0.01% of the 13F portfolio, value $14,831,222.

    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 48,567 shares
    Change vs previous 13F -480 shares

    0.01% of the 13F portfolio, value $14,560,873.

    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 49,047 shares
    Change vs previous 13F -19,854 shares

    0.01% of the 13F portfolio, value $17,119,364.

    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 68,901 shares
    Change vs previous 13F -140 shares

    0.02% of the 13F portfolio, value $25,394,842.

    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 69,041 shares
    Change vs previous 13F -29,418 shares

    0.02% of the 13F portfolio, value $25,612,830.

    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 98,459 shares
    Change vs previous 13F not available

    0.03% of the 13F portfolio, value $35,434,409.

    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).