Economic agents hold a considerable percentage of their assets in cash and this matter has preoccupied researchers for a long time. Firms usually consider target cash levels as their main objective and to get access to it, they make corrections in cash holdings based upon factors that are effective in determining target cash levels. This study was an attempt to investigate the effects of 10 factors on keeping cash holdings, using the periodical financial statement data of the corporations listed in Tehran Stock Exchange (TSE), from 2000 to 2005 using multi-variable linear regression.