Initial public offering (IPO) related activities created, one of the greatest puzzles in finance researchers and practitioners, and maximum no. of theories in this regard. In fact, puzzles are many, from underpricing by issuers to subscription of overpriced securities by investors, from issuer’s content with underpricing Underwriters to sentiment investors to shun rationality, from market efficiency to moral hazard and agency problem, from time varying pattern to cross country varying pattern, from assumption about rationality to sentiment investors, and so on, the puzzles goes up to varying assumptions from market participants to impact of regulations. Soon after, IPO pricing puzzle took center stage in finance literature debates, researchers proposed various theories and interpretation to explain the puzzle. Different researchers made different assumptions about market, about participants, about behavior, about risk, about definition of underpricing etc. while some theories were developed with induction approach; some were developed with deduction approach too. While some researchers were proposing their theoretical models, several other researchers were contributing with insights from their empirical studies. IPO puzzle witnessed maximum no. of theories and hypothesis to explain the puzzle, developed on different basis. Some theories were developed based on information asymmetry, some based on institutional framework and some were based on behavioral basis. However, several theories that were proposed as competing (as alternative), with a closer look, might look actually completing each other in explaining the wider phenomena of IPO puzzle, because of their varying assumptions that covers different aspect or states of market. This literature review has been done with objective to review theoretical literature developed to explain IPO puzzles in such comprehensive framework, to examine, if they together could be fitted into a unified picture of IPO theory. The objective is to contribute towards reductionism of the theories and to provide some ground for future research questions. The focus area is mainly theoretical review of literature; however, help of some empirical work that were observed during the work is taken with limited purpose to complete the analysis. In this process, some methodological issues with empirical analysis and suggestions are also discussed for use of future empirical work in this field to make result more unbiased and inclusive. A potential new model is suggested that can incorporate various complementing models into one to solve IPO market puzzles.
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