Topic - Citadel Investment Group

Citadel LLC (formerly known as Citadel Investment Group, LLC) is a global financial institution based in Chicago, Illinois. Founded in 1990 by Kenneth C. Griffin, the firm deploys capital across multiple asset classes and strategies. Citadel's main activities also include equity and options market-making. Citadel is among the largest firms to practice order flow internalization, which accounts for a significant amount of its revenue. - Source: Wikipedia