
Originally Posted by
Wirestripper
Uhhh yeah you sell them short back to your broker, not to the market. The broker does the arbitrage in house as I understand it.
What you likely saw was a broker buying shares to replenish his stock, so to speak.
My broker, TDAmeritrade, brokes siri among others. They use the ISEG from what I can tell in my order strings. That also may explain the 100 share blocks from the options traders on TD. A excercised option would result in a ton of them from ISEG.
But I digress.