Studies investigating the pricing of Initial Public Offerings (IPOs) have documented
the existence of underpricing (Logue, 1973; and Rock, 1986; and Yong and Isa, 2003).
Underpricing refers to the situation where a private company seeking to list its shares on a stock
exchange prices its shares to the public at a discount relative to its true value. This allows investors
to earn positive abnormal returns if they were to sell their shares once trading commences.
The initial abnormal returns are typically measured by taking the difference between
the offering price and the opening market price on the first trading day (Yong and Isa, 2003),
or closing market price at the end of the first day (Logue, 1973; Ritter, 1984; and Ritter
and Welch, 2002), or first week or first month after listing (Cheung and Krinsky, 1994).
Although there are a number of explanations as to why IPO shares are underpriced, the most
widely accepted one relates to information asymmetry in the IPO market. Due to information
gap between the company and the investing public, issuers deliberately price their shares
below intrinsic value to induce investors to reveal their demand (Benveniste and Spindt, 1989)
or to compensate uninformed investors for the costs of gathering information regarding
the company (Rock, 1986). Rock found that the greater the information gap, the greater
the extent to which the US IPO shares are underpriced. Other underpricing theories involve
a signaling model where issuers underprice their offerings in order to charge a higher price
in the subsequent Seasoned Equity Offerings (SEOs). In the signaling models proposed
by Grinblatt and Hwang (1989) and Welch (1989), high quality firms may deliberately
underprice their IPOs in order to signal their quality and recoup the reduction in IPO proceeds
from subsequent equity offerings. An alternative reason for underpricing relates to the
moral hazard problem where investment bankers/underwriters underprice new equity issues
to minimize their risk of under subscription (Ibbotson, 1975) or to reduce the effort they
have to expend in marketing the new issue (Baron, 1982).
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