Optiver Holding B.V. is an institutional investment manager that files quarterly 13F reports with the SEC. As of Q2 2026, the fund manages $370.7B in reported equity holdings across 2757 positions. The largest holdings are QQQ (17.4%), QQQ (15.0%), QQQ (9.1%), QQQ (7.7%), ^EWJV (4.0%). The portfolio is concentrated in Other (94.7%), Technology (2.9%), Communication Services (1.1%). Data sourced from SEC EDGAR 13F filings (CIK 1859606).