This report discusses the construction of an efficient portfolio based on analyzing 10 companies from different industries in Bangladesh. The steps taken include selecting companies, analyzing their industries, adjusting stock prices for dividends and splits, calculating returns, and preparing a covariance matrix. The efficient frontier and capital allocation line are plotted to identify the optimum portfolio with the highest return for a given risk level and the minimum risk portfolio for a given return level, both with and without short selling. The analysis provides a way for investors to evaluate stock companies and decide optimal investment amounts to achieve expected returns.