PRIMECAP MANAGEMENT CO/CA/ is an institutional investment manager that files quarterly 13F reports with the SEC. As of Q1 2026, the fund manages $127.0B in reported equity holdings across 320 positions. The largest holdings are LLY (6.7%), MU (5.8%), GOOG (3.4%), AZN (2.8%), KLAC (2.8%). The portfolio is concentrated in Other (81.6%), Industrials (4.2%), Communication Services (3.9%). Data sourced from SEC EDGAR 13F filings (CIK 763212).