Shorting an IPO is theoretically possible.. but doesn't happen.
Call your broker for shits and giggles and ask if you can short an IPO. When he stops laughing, report back!
The Bottom Line While there are regulatory and practical obstacles to short selling stock from an IPO, mainly via the limitations set on underwriters, short selling a company on the day of its IPO is still possible if institutional or retail investors who have purchased the stock lend it out for short selling. However, the amount of stocks available for short selling and the willingness of investors to do this immediately is small.