This study is expected to describe a real phenomenon that occurs on the Indonesian stock exchange to determine the direct relationship between the Debtto Equity Ratio (DER) and the Reputation of the Underwriter on the Indonesia Stock Exchange (IDX). uses qualitative research, namely field observation research by distributing data that has been structured in a structured manner, and collecting information on the IDX, IDX Fact Book, and scientific literature. From 104 companies and there are 96

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... mpanies who experience underpricing, Underpricingon the condition of the company selling shares to the public or Initial Public Offering (IPO) in 2018 which is influenced by the reputation of the underwriter, the size of the company. This study only consists of three variables, Debt to Equity Ratio (DER), Influence, and Reputation of the Underwriter on the Underpricing Phenomenon, while there are many other factors such as stock trivia and e-IPO so that it will be better and meet scientific principles. Underpricing that occurs in companies conducting IPOs, is mostly avoided by other companies because the funds obtained are not maximally obtained from the initial investment price and are below the market price or stock price in the market.