IPO Underpricing and After-Market Liquidity

The underpricing of initial public offerings (IPOs) is generallyexplained with asymmetric information and risk. We complementthese traditional explanations with a new theory where investorsworry also about the after-market illiquidity that may resultfrom asymmetric information after the IPO. The less liquid theaftermarket is expected to be, and the less predictable itsliquidity, the larger will be the IPO underpricing. Our modelblends such liquidity concerns with adverse selection and riskas motives for underpricing. The model’s predictions aresupported by evidence for 337 British IPOs effected between1998 and 2000. Using various measures of liquidity, we findthat expected after-market liquidity and liquidity risk areimportant determinants of IPO underpricing.