The purpose of this study is of investigate the impact of working capital management onrnfirms' profitability. The study aims to examine the statistical significance between firms rnworking capital management and profitability.rnIn light of this objective the study adopted quantitative method a/research approaches to testrna series research hypothesis. the study used surrey of documentary analysis ofrncompanies' audited financial salesmenâ€™s. Stratified sampling design was employed based onrnnature and turnover of companies. Then companies were selected based on simple randomrnsampling method from each stratumâ€™s to avoid biases and represent firms each sub classrnclassification (stratum 's) within manufacturing companies. Consequently, the study selectedrna sample of thirteen (13) companies for the period of five years (2005-2009) with the total ofrn65 observations. Dale was then analyzed on quantitative basis using Pearsonâ€™s correlationrnand OLS regression analysis.rnThe results showed that there is statistical s significance negative relations hip betweenrnprofitability and working capital management. It means that, companies managers canrncreate profits or' value for their companies and share holders by handling correctly the cashrnConverseion cycle and keeping each different component a/working capital to a possiblernoptimum level. The researcher found that there is a significant negative relationship be/weanrnliquidity and profitability. Moreover the study finds that there is strongly significancernpositive relationship between size and firm profitability. Unlike, the study found that there isrnon statistically significance negative relationship between debt used and firms profitability.rnKeywords: working capital, working capital management, firm size. cash conversion cyclernand profitability.