Company · Finance · founded 2002
Citadel Securities
American market-making firm headquartered in Miami. It is a separate entity from the hedge fund Citadel LLC, though both were founded by Ken Griffin and are majority owned by him.
Of the 1 person here linked to Citadel Securities, 1 is a founder and 1 is still there. These are people who succeeded, not the odds of succeeding.
Description and founding year: en.wikipedia.org. Each person's role links to its own source on their profile.