IPOs and long-term relationships: An advantage of book building

There is a global trend in initial public offerings toward the increased use of book building. Relative to other methods such as auctions, a key feature of book building is that the underwriter has total discretion in allocating shares, allowing allocations to be based on long-term relationships between underwriters and investors. in a multiperiod model with endogenous (and costly) information acquisition, I show that the underwriter's ability to lower underpricing depends largely on its ability to favor regular uninformed investors. One implication is that the hybrid book building/open offer method, which is becoming increasingly popular internationally, will lead to higher underpricing than straight book building.