ABSTRACTThis was an event study on the performance of stocks after the companyconducted an IPO on the BEI. The goal is to find out what happened phenomenonoutperformed short-tram stock performance to what happened three months andunderperformed the phenomena of long-term stock performance for two years.Performance is measured by stock return. The samples were companies in IPOperiod 2014-2015. A total of 38 companies.The result of this study indicate that short-term phenomena three month alsooutperformed the stock performance indicated by positive return of 23,684% And forthe long-term phenomena occurred two years also outperformed the stockperformance indicated by positive return of 35,459%. The performance increase wassignificant, the results of both studies support previous that long-term not phenomenaunderperformed.Keyword: company growth after IPO, experiencing an increase or decrease