Bookbuilding vs. fixed price: An analysis of competing strategies for marketing IPOs

We compare two mechanisms for selling IPOs, the fixed price method and American bookbuilding, when investors have correlated information and can observe each other's subscription decisions. In this environment, the fixed price method is a strategy that can create cascading demand. Alternatively, an underwriter building a book aggregates investor information into the offer price. We find that bookbuilding generates higher expected proceeds but exposes the issuer to greater uncertainty, and that it provides the option to sell additional shares that are not underpriced on the margin.