Citadel

Citadel manages approximately $63 billion in assets under Ken Griffin, who started trading from his Harvard dorm room in 1987. The firm's multi-strategy approach delivered a staggering 38% return in 2022 when most funds lost money, generating $16 billion in profits -- the largest single-year gain in hedge fund history. Griffin also runs Citadel Securities, the dominant US market-maker processing 25%+ of all US equity trades.