It's pretty incestuous though. Mortgage backed security market got started at the Salomon Brothers before fumbling it to Morgan Stanley before GS ultimately dec

It's pretty incestuous though. Mortgage backed security market got started at the Salomon Brothers before fumbling it to Morgan Stanley before GS ultimately decided when to pull the rug on it all. Citadel might not be a bank but market making is one of it's core functions much like them. Names might change but I bet many of the same players move between these firms.