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PRIMECAP MANAGEMENT CO/CA/: OSIS position timeline

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

PRIMECAP MANAGEMENT CO/CA/ held 258,180 OSIS 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 258,180 shares
    Change vs previous 13F +13,520 shares

    0.03% of the 13F portfolio, value $56,463,966.

    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 244,660 shares
    Change vs previous 13F -23,050 shares

    0.05% of the 13F portfolio, value $64,959,677.

    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 267,710 shares
    Change vs previous 13F -38,920 shares

    0.05% of the 13F portfolio, value $68,282,113.

    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 306,630 shares
    Change vs previous 13F -14,790 shares

    0.06% of the 13F portfolio, value $76,424,461.

    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 321,420 shares
    Change vs previous 13F -12,910 shares

    0.06% of the 13F portfolio, value $72,274,501.

    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 334,330 shares
    Change vs previous 13F +36,620 shares

    0.05% of the 13F portfolio, value $64,973,692.

    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 297,710 shares
    Change vs previous 13F +3,210 shares

    0.04% of the 13F portfolio, value $49,845,585.

    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 294,500 shares
    Change vs previous 13F not available

    0.03% of the 13F portfolio, value $44,713,935.

    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).