Optiver Holding B.V. is an institutional investment manager that files quarterly 13F reports with the SEC. As of Q1 2026, the fund manages $289.5B in reported equity holdings across 2301 positions. The largest holdings are QQQ (21.0%), QQQ (15.3%), QQQ (8.0%), QQQ (7.2%), GLD (4.3%). The portfolio is concentrated in Other (94.8%), Technology (2.2%), Communication Services (1.3%). Data sourced from SEC EDGAR 13F filings (CIK 1859606).