GROUP ONE TRADING LLC is an institutional investment manager that files quarterly 13F reports with the SEC. As of Q1 2026, the fund manages $52.2B in reported equity holdings across 7822 positions. The largest holdings are GLD (3.3%), TSLA (2.0%), META (1.7%), UNH (1.4%), GLD (1.3%). The portfolio is concentrated in Other (85.4%), Technology (4.3%), Communication Services (3.0%). Data sourced from SEC EDGAR 13F filings (CIK 932540).