Interaction Between Short Selling and Potential Insider Selling in the IPO Aftermarket

We document the determinants of short interest in newly public firms during the lockup period and how short interest influences the valuation effects surrounding lockup expiration. We find that the short interest is larger for stocks that have more downward price potential at lockup expiration. We also find that the stocks that are subjected to larger short positions experience more pronounced negative valuation effects upon lockup expiration. Finally, we find that the stocks with a larger short interest position just after lockup expiration experience weaker returns during the following the six-month period.