Interactive Brokers currently has 3,700,000 shares of SPNG available to short. I just found this info , I thought you could not short pennies unless you are holding contract stock thru a financing, i.e. unregistered shares and work out a private deal with a broker directly. It appears IB will allow you to short these pennies and they have an inventory of SPNG stock available to shorting.
IB provides a stock inventory utility in Account Management, under the "Tools" icon. This utility provides indicative inventory information, estimates of the number of shares currently available for borrowing, estimated borrow rates, rate trends, and an indicator of how many different lenders are prepared to make their inventory available. By considering this pool of information, traders can manage their short selling strategies appropriately. http://www.interactivebrokers.com/en/p.php?f=shortableStocks&p=s&ib_entity=llc
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