An Empirical Analysis for Abnormal Returns from Initial Public Offerings (IPOs): evidence of Iranian oil and chemical industries

Abstract

Purpose: The core purpose of this paper empirically study of the initial public offerings (IPOs) of companies accepted in oil and chemical industries. The paper attempts to answer the question of is there any abnormal return from IPOs in listed companies in Tehran Stock Exchange (TSE).

Design/methodology/approach: This research is an applied research, and its design is empirical, which is done by the method of post-event (past information). For the purpose of the study the t-statistic, regression and variance analyses are applied to examine the hypotheses. We use in the analyses a sample of 29 newly accepted Iranian oil and chemical companies listed on TSE for the period of 2001 to 2012. This paper has studied abnormal return and three abnormal phenomena have been considered in capital market. These phenomena consist: (1) underpricing or overpricing of the firm's stock, (2) lower or higher stock return of the firms and (3) Particular period in market for stock transactions volume.

Findings: The results support the hypothesis that there is a positive abnormal return to investing in the newly accepted oil and chemical firms for stockholders. It also shown the firm size is the only factor that can affect the stock abnormal return. With considering significance level, investors have to give attention sequentially to other variables such as stock ownership centralization, going public time and stock offering volume.