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How to bet against IPOs?
There are 2 primary ways to bet against a stock if you think it will decline. The first is to short sell shares of that stock the second is to buy put options (I would also add that selling naked call options would also be a bet against but I don't believe that is as common as the other 2 mentioned methods). The problem with short selling an IPO is that you first have to borrow the shares you are going to sell. Since the shares are privately held prior to the IPO that can be problematic. Even after the IPO you may have to wait a bit before shares become available to borrow.  The problem with options (either buying puts or seeking naked calls) is similar. Options are traded on a different exchange than the stock and they have their own requirements that a stock must meet to have options traded. Both of these problems eventually correct themselves however, not in time for you to catch the initial fall you seem to be looking for.