Aaron Task
Brian Overby, director of education at TradeKing, a discount broker that caters to sophisticated option traders, suggested that this could be a box trade before Perper came forth.
Overby noted that the September 1700 strike has open interest of 73,745 calls and 61,741 put options. "This could be someone trying to create a box spread, which is a position composed of a long call and short put at one strike, and a short call and long put at a different strike. The position is largely immune to changes in the price of the underlying stock, and in most cases, is a simple interest rate trade." So the upshot is there is an explanation for this very unusual configuration of open interest in the S&P 500 Index's September options, but it also shows jitters remain in this market.
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