PRIMECAP MANAGEMENT CO/CA/ is an institutional investment manager that files quarterly 13F reports with the SEC. As of Q4 2025, the fund manages $132.1B in reported equity holdings across 319 positions. The largest holdings are LLY (7.5%), MU (5.4%), GOOG (3.6%), MSFT (2.7%), KLAC (2.6%). The portfolio is concentrated in Other (81.8%), Communication Services (4.2%), Industrials (3.8%). Data sourced from SEC EDGAR 13F filings (CIK 763212).