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oh shit this is a deeper story than i expected
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Step 0: Citadel pays Robinhood for order flow. Citadel gets to see RH's orders a few milliseconds before they're filled. Citadel may choose to front-run some of those trades. Step 1: RH's customers and WallStreetBets start manipulating $GME. This is happening in the open.
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oh yeah, robinhood is notoriously terrible because it hides "no-fee" trading by having bad prices for a lot of its options (everything trades at a premium and the spreads suck), which is perfect given that it's based around day trading (which is all about the spread)
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this isn't a secret either (WSB knows this, and strongly encourages people to use other services if they're trading larger amounts of money where you'd be better off paying fees)
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... but nonetheless even though it's not a secret, it's still a big factor. robinhood's order flow sells for an order of magnitude more than any other trading firm because their customers are much more profitable
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i wouldn't say that's the case frontrunning trades doesn't necessarily mean anything with regards to overall market movement per se; at the most basic level it just means shaving a few fractions of a cent off every trade, effectively
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i'm not an HFT person so i can't say for sure, of course, but "paying for order flow" *doesn't necessarily* mean they're doing anything dramatic that would change the long-term (i.e. on intervals greater than a few seconds/minutes) prospects of the market
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