[gyardley]

Of course they can't, the float is teeny.

Eventually you'll be able to buy put options, but you're going to pay a huge premium because of that float - there's a real risk the clearing firm will force your market-maker to buy stock, which has to be priced into the cost of the put.

Buying options is sort of like gambling on a sports team. When the sentiment's one-sided, the odds naturally get adjusted. You'll only make a bit of money shorting Groupon if you're right, but you'll still lose everything if you're wrong.

If you absolutely must do this, at least buy a put spread to hedge your risk at a bit.