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Underpricing and aftermarket performance of IPOs in the UK : an empirical review

Cotgrove, Christie
Master thesis
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URI
http://hdl.handle.net/11250/2560964
Date
2018
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  • Master Thesis [4657]
Abstract
This thesis contributes to the literature on Initial Public Offerings (IPOs). It seeks to uncover

and explain underpricing and aftermarket performance for companies that go public for the

first time in the United Kingdom (UK).

By creating a novel dataset of 194 UK IPOs that occur between 2006 and 2017, I find evidence

that the UK IPOs exhibit first day returns equal to 7.4%. The underpricing is evident in all the

years examined, showing that positive first day returns are a consistent phenomenon. IPOs

that are issued during periods of above average first day returns, called hot markets, exhibit an

average underpricing of 12.6%. Further, IPO firms that have higher profit margins in the year

prior to the IPO, experience a positive 0.2% addition to their first day return on average.

Finally, private-equity backed IPOs exhibit significantly lower first day returns of 3.1% on

average, while their venture-backed counterparts do not.

Regarding aftermarket performance, I find varying evidence of outperformance and

underperformance depending on the benchmark and method employed. My IPO sample

significantly outperforms the FTSE benchmarks on a six-month basis, but for the longer

periods of one-, three-, and five-years the results are inconclusive. Further, the wealth relatives

confirm that the IPOs outperform the benchmark for the six-month holding period, showing a

wealth relative equal to 1.06 and 1.05 when compared to FTSE All Share Index and the FTSE

Small Cap Index, respectively. For the six-month holding period, private equity-backed IPOs

increase returns by about 18%, while the one-year holding period is even more pronounced,

increasing returns approximately 30%. Finally, I use the CAPM (Sharpe 1964), the FamaFrench

three-factor model (Fama and French 1993), and a newer three-factor model by Asness,

Moskowitz et al. (2013) to examine abnormal returns of the IPOs in terms of alpha. However,

none of the factor models show significant alphas.

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