Today, due to the increasing growth of the emergence of companies and the increasing trend of acceptance of companies in stock exchanges among all countries, the capital market, stocks and shareholders have become important issues, and companies need to attract shareholders and investors to remain in the capital market. The cash conversion cycle refers to the time required between the purchase of raw materials and the collection of funds from the sale of manufactured goods. Cash conversion cycle management is considered as a basic factor for working capital management. The purpose of this article is to examine the cash conversion cycle and financial performance and its impact on marketing. The statistical population of the research includes companies admitted to the Tehran Stock Exchange during the years 1393-1400. In this research, operational cash flow criteria including inventory circulation period, receivables collection period and creditor deposit period, operational cash flow criteria including cash conversion cycle are considered. In this research, which uses panel data with fixed and random effects, the results of the analysis of companies' data using multiple regression at the 95% confidence level show that the period of inventory circulation, the period of collection of claims, the cycle Cash conversion has an inverse relationship with the financial performance of companies.