Citadel LLC is one of the largest hedge funds based in the U.S., with approximately $92.46 billion in total assets under management as of Sept. 30, 2023. Citadel has generated roughly $74 billion in total gains since its inception in 1990, making it the most successful hedge fund of all time. Founded by Ken Griffin, Citadel was the second best-performing fund in 2023, raking in approximately $8.1 billion in profits last year.