This research aims to evaluate the effect of the underwriter’s reputation, auditor’s reputation, company’s profitability (ROE), size of company and the percentage of stocks offered to the public, towards the underpricing level that happened in Indonesia Stock Exchange (IDX) at initial public offering (IPO). Samples obtained were as many as 45 companies listing in IDX during the period of 2006-2008. The data are analyzed by using multiple linear regression with level of significance (á) 5%. The results of this research indicated that only the underwriter’s reputation influence the underpricing level, individually. Keywords: underwriter’s reputation, auditor ’s reputation, Return on Equity, size of company, the percentage of stocks offered to the public, underpricing
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