| I don't think this was Robinhood's choice. Robinhood doesn't actually execute any trades. They sell user's trade orders to Citadel, a trade executor. Citadel then buys the shares on the market, and sells them to Robinhood for a slight markup. It's how Robinhood offers trades for $0 fees. You pay pennies more per share, but don't have to spend $5 per trade. Citadel, and other trade executors, are refusing to buy shares for retail traders. Coincidentally, Citadel also bailed out Melvin fund for their short position in GME. So, Citadel has an interest in not letting the price go up any further. And citadel controls trade execution for dozens of firms. This is definitely illegal. But Citadel is betting that the resulting SEC fines from this illegal manipulation will be less than the loss they would get if they didn't suppress the price. |
Citadel bailed out Melvin Capital. Not its position. Melvin doesn't have a short position anymore.
Melvin made a stupid bet. Citadel bailed them out. Private sector bailouts aren't free: Citadel got its pound of flesh. Even if they bought the entire portfolio, that portfolio no longer includes GameStop shorts.
If Citadel's asset management and market making arms are colluding, that is illegal. But it's the most complicated and stupid explanation of the bunch. Market makers stop quoting for all kinds of reasons. If I were still on my options market making desk, I'd be pulling the plug on this. My traders would yell at me. This is what you make money on in market making! But the risks of loss go up with volatility, and the costs of gamma getting away can be nasty.
The chances that a fund the size of Citadel has any strong opinion on the direction of GameStop stock is vanishingly low. The chances that they stopped quoting in the name, as did almost every other market maker, and thereby broke Robinhood's system, which doesn't--to my knowledge--directly interface with exchanges to any significant degree, is high.