IPO Pricing Mechanisms in the Presence of When-Issued Markets

Abstract

In some countries, it is common that initial public offerings (IPOs) are preceded by forward ("when-issued") trading of the shares; in the US, such trading is prohibited. We analyze the effect of when-issued trading on the pricing and allocation of IPO shares. We demonstrate that the optimal selling mechanism in the presence of when-issued trading differs qualitatively from the optimal mechanism if such trading is prohibited. Furthermore we show that trading rules in the when-issued market can be designed so that allowing when-issued trading results in an increase in expected issue proceeds.