The study aims to know the reflection of the application of fair value accounting on revitalizing the market and increasing its efficiency through the opinions of preparers, analysts, and users of financial information for companies listed on the Iraqi Stock Exchange. The research provided a framework of knowledge for the concept of fair value and its importance in the stock market based on the descriptive analytical approach by preparing a questionnaire prepared for this matter. Furthermore, A random sample was selected that includes a group of specialists in the aspects of financial analysis and investment, and the conclusion that was reached is the existence of a relationship of using fair value accounting by companies registered in the Iraqi Stock Exchange and increasing the market capitalization of the market.