CITADEL ADVISORS LLC is an institutional investment manager that files quarterly 13F reports with the SEC. As of Q1 2026, the fund manages $618.5B in reported equity holdings across 6733 positions. The largest holdings are SPY (6.8%), IWM (5.1%), NVDA (3.9%), TSLA (3.8%), GLD (2.4%). The portfolio is concentrated in Other (85.4%), Communication Services (4.9%), Technology (3.2%). Data sourced from SEC EDGAR 13F filings (CIK 1423053).