Citadel LLC is a global financial institution founded in 1990 by Ken Griffin. It operates primarily in two main areas: asset management and market making. The firm manages a diverse range of investment strategies, including equities, fixed income, and commodities, catering to institutional investors and high-net-worth individuals. In addition to asset management, Citadel is known for its market-making activities through its subsidiary, Citadel Securities. This division provides liquidity to financial markets by facilitating trades for various clients, including broker-dealers and retail investors. Citadel LLC has established itself as a significant player in the finance industry, known for its innovative technology and data-driven approach.