GROUP ONE TRADING LLC is an institutional investment manager that files quarterly 13F reports with the SEC. As of Q4 2025, the fund manages $57.3B in reported equity holdings across 8343 positions. The largest holdings are TSLA (2.1%), META (2.1%), UNH (2.0%), NVDA (1.4%), GLD (1.3%). The portfolio is concentrated in Other (82.9%), Technology (5.2%), Communication Services (4.3%). Data sourced from SEC EDGAR 13F filings (CIK 932540).