In this thesis, I investigate economic policy uncertainty effects on IPOperformancefor 1997 to 2016 in the USmarket.To measure uncertainty I use Baker, Bloomand Davis (2016) created an economic policy uncertainty index and my own made Factiva index.Myinvestigation of IPO performance is threefold. First, I investigate economic policy uncertainty effects on IPO volume and proceeds. Second, I test whether economic policy uncertainty would affect specificindustry sectors differently. Finally, I investigate whether high economic uncertainty would extend the IPO registration period.