The study focuses on finding the validity of the capital asset pricing model (CAPM) on the Dhaka Stock Exchange (DSE) on both individual securities and portfolio levels. Using 102 securities data with the monthly stock prices for preceding five years, the outcome suggests that CAPM does not hold true for DSE, both on an individual company level and portfolio level. The securities market of Bangladesh (DSE in this case) proved inefficient as unsystematic risk premium become significant and beta cannot measure the risk component of securities investment.