seyed mohammad termeh ghaziani - m.a of accounting department of accounting east azarbaijan science and research branch islamic azad university tabriz iran
mohammadreza nemati - master student in accounting chaenat branch islamic azad university iran
seyedeh afrooz bahraloloom - master student in business management rasht branch islamic azad university iran
ahmad naserijorshari - member of iranian association of certifiedpublic accountants

This Research examines the relationship between components of working capital management i.e cash conversion cycles (CCC), current ratio (CACLR), current asset to total asset ratio (CATAR), current liabilities to total asset ratio (CLTAR), and debt to asset ratio (DTAR) to the firm's performance by looking at firm's value i.e Tobin Q (TQ) and profitability i.e. return on asset (ROA).To review and test the relationship between the variables, 5 years dataof 80 companies listed in Tehran Stock Exchange between 2008 - 2012 , has been studied. The research hypothesis has been tested by least squares Method (OLS) with using F and t tests. The result shows that there are significant negative associations between working capital variables with firm's performance(significant negative associations between working capital variables with ROA and ROI and Some working capital variables whit Tobin Q ). Thus it highlights the importance of managing working capital requirements to ensure an improvement in firm's market value and profitability and this aspect must form part of the company's strategic and operational thinking in order to operate effectively and efficiently.

Working capital management,market valuation,profitability ,cash conversion cycle,tobin-Q,return on asset ratio,return on investment ratio