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How come I can't sell short certain stocks? My broker says “no shares are available”
Shorts are difficult because you have to find someone to lend the stock to you. In contrast, put options don't require that. They also have some nice properties like you're only out the contract price. The options chain for BSFT will give you an idea of where the market is.  Keep in mind that BSFT only IPO'd last year and announced blowout earnings recently. Make sure the P:E you're looking at is using recent earnings reports!