This research paper focuses on analyzing the cost of capital of publicly-traded companies. It reviews the literature on capital structure, its importance, the risk associated with different capital structure and the total cost of capital of an organization. The report explains that the main concept of the capital structure is to identify how an organization finances its assets through the equity and debt. The report also studies the optimal level of capital structure and its impact on the overall position of the company. The study is conducted on four companies of the retail industry of Saudi Arabia.