[Using a unique dataset of complete bid information for every IPO auction in Taiwan during 1995-2000, we examine the behaviors and returns of two groups—institutional and retail investors—in a setting in which underwriters do not have pricing or allocation discretion. We find that the bids of institutional investors are generally consistent with the predictions of IPO auction theory for informed bidders, while those of individual investors are not. Specifically, returns are higher when more institutional investors enter the auction or bid higher prices, suggesting institutional investors are informed and are also able to shave bids adequately. However, individual investors as a group exhibit return-chasing behavior, are uninformed, and systematically overbid.]

[We examine how experience affects the decisions of individual investors and institutions in IPO auctions to bid in subsequent auctions, and their bidding returns. We track bidding histories for all 31,476 individual investors and 1,232 institutional investors across all 84 IPO auctions during the period from 1995 to 2000 in Taiwan. For individual bidders, (1) high returns in previous IPO auctions increase the likelihood of participating in future auctions; (2) bidders' returns decrease as they participate in more auctions; (3) auction selection ability deteriorates with experience; and (4) those with greater experience bid more aggressively. These findings are consistent with naïve reinforcement learning wherein individuals become unduly optimistic after receiving good returns. In sharp contrast, there is little sign that institutional investors exhibit such behavior.]

Using a unique dataset of complete bid information for every IPO auction in Taiwan during 1995--2000, we examine the behaviors and returns of two groups--institutional and retail investors--in a setting in which underwriters do not have pricing or allocation discretion. We find that the bids of institutional investors are generally consistent with the predictions of IPO auction theory for informed bidders, while those of individual investors are not. Specifically, returns are higher when more institutional investors enter the auction or bid higher prices, suggesting institutional investors are informed and are also able to shave bids adequately. However, individual investors as a group exhibit return-chasing behavior, are uninformed, and systematically overbid. The Author 2009. Published by Oxford University Press [on behalf of The Society for Financial Studies]. All rights reserved. For Permissions, please e-mail: [email protected]., Oxford University Press.

Studying the only mandatory pre-IPO market in the world—Taiwan’s Emerging Stock Market (ESM)—we document that pre-market prices are very informative about post-market prices and that informativeness increases with a stock’s liquidity. The ESM price-earnings ratio shortly before an initial public offering explains about 90% of the variation in the offer price-earnings ratio. However, the average IPO underpricing level remains high, at 55%, suggesting that agency problems between underwriters and issuers can lead to excessive underpricing, even with little valuation uncertainty. Also, regulations impact the relative bargaining power of players and therefore IPO pricing.

We examine how experience affects the decisions of individual investors and institutions in IPO auctions to bid in subsequent auctions, and their bidding returns. We track bidding histories for all 31, 476 individual investors and 1, 232 institutional investors across all 84 IPO auctions during the period from 1995 to 2000 in Taiwan. For individual bidders, (1) high returns in previous IPO auctions increase the likelihood of participating in future auctions; (2) bidders' returns decrease as they participate in more auctions; (3) auction selection ability deteriorates with experience; and (4) those with greater experience bid more aggressively. These findings are consistent with naïve reinforcement learning wherein individuals become unduly optimistic after receiving good returns. In sharp contrast, there is little sign that institutional investors exhibit such behavior. The Author 2011. Published by Oxford University Press on behalf of The Society for Financial Studies. All rights reserved. For Permissions, please e-mail: [email protected]., Oxford University Press.