The study aimed at assessing of the impact of stock controls on management of costs in organizations and it was guided by the following objectives; To examine the relationship between stock planning and management of costs at Mukwano Group of Companies, to establish the relationship between stock replenishment through procurement and management of costs at Mukwano Group of Companies and to determine the relationship between stock control and management of costs at Mukwano Group of Companies. The study adopted cross sectional study design by using both quantitative and qualitative approaches as its frame work to guide the process of data collection and processing on the assessment of stock control on cost management of organization in Mukwano Ltd Kampala. The quantitative approach was adopted to measure the magnitude of the various constructs and variables that are conceptualized in the study. From the findings, there was a strong positive relationship between stock replenishment and performance of utility organizations in Uganda, (r=0.725 p=0.000 N=58). The relationship was statistically significant at 95% confidence level since pvalue<0.050(=0.000). This implied that improved stock replenishment led to improved performance of utility organizations in Uganda. Similarly, declined stock replenishment led to declined performance of utility organizations in Uganda. Utility organizations in Uganda, particularly MGC should invest more money in ICT for stock planning in order to enable easy, effective and efficient planning which will ensure stock outs are minimized and adequate stock maintained all the time. Utility organizations should hire experts on stock planning to best guide them on how to develop feasible stock plans which will ensure adequate stock throughout the year. research.miu.ac.ug/publications 197 METROPOLITAN JOURNAL OF SOCIAL AND EDUCATIONAL RESEARCH ISSN: 1813-4270 Vol. 2 Issue 5, August - 2023, Pages: 197-221