This paper reassesses the apparent systematic underpricing of initial
public offerings (IPOs). Investigation of the distribution of initial
returns following IPOs shows that positive mean initial returns may re
flect the existence of a partially unobserved left (negative) tail. Mo
reover, most IPOs with zero one-day returns subsequently fall in price
, suggesting that underwriter price support may account for the skewed
distribution and hence the phenomenon of positive average initial IPO
returns, even if offering prices are set at expected market value. Th
is paper thus challenges the presumption underlying previous research
that positive average initial IPO returns result primarily from delibe
rate underpricing.