The weak form of market efficiency hypothesis (EMH) states that the stock prices reflect all the past information making technical analysis futile and abnormal profits cannot be made by studying the past & present stock prices to predict future stock prices. Numerous studies have been conducted to test the stock market efficiency world ever particularly in the second half of twentieth century. After initial later, studies have produced incredible evidence supporting market efficiency across the globe. The results obtained from these studies were considered robust the weak form of efficiency. As a result it has been conclusively established that stock market is efficient in weak has been conclusively established that stock market is efficient in weak form. Occasionally, studies negating these robust findings were also noticed over these years.