The study aimed at the effect of working capital management on financial performance of centenary bank. The main working capital components that were analyzed included cash and cash equivalents, total loans and advances to customers, total deposits from customers, and total short-term borrowing. Cash conversion cycle was calculated as the number of days inventory was held in stock plus days sales outstanding minus days payable outstanding. Net interest margin, return on equity and return on assets were used as indicators of profitability. Descriptive statistical analysis was conducted to study the trends in working capital metrics and profitability ratios over 2013-2018. According to results, it was indicated that F= 61.453, p<000, meant the positive hypothesis that there was a significant relationship between working capital management and financial performance was accepted, hence rejecting the implied null hypothesis. The management should embrace proper cash inventory and creditors’ management so as to ensure that the institutions are able to finance their operations without financial limitations.