I read a bunch of articles today and yesterday. Robinhood outsources their order execution to Citadel, which handles more than just Robinhood trades. Or actual

I read a bunch of articles today and yesterday. Robinhood outsources their order execution to Citadel, which handles more than just Robinhood trades. Or actually, "outsources" is a misnomer because Citadel pays them for the orders, so they can make money front-running them. That's why Robinhood trades are "free" for their retail users. You don't pay a fee but you get a slightly worse price. Citadel also, fwiw, just loaned $2.5B to a fund with a lot of short exposure to GME.