The Infosys stock on Thursday closed at a four-month high level on Thursday a day after the Bengaluru-based firm said it would consider a proposal for buyback of its equity shares at its meeting to be held on August 19. The stock was top gainer on Nifty 50 and the 30 stock Sensex. A share buyback is repurchase of a company's outstanding shares that reduces the number of shares in the open market. The buyback is carried out usually at a premium ...