Anil Dhirubhai Ambani Group firm Reliance Infrastructure today said it has bought back five lakh equity shares of the company from the open market. "Reliance Infrastructure today bought back five lakh equity shares of the company,pursuant to the buy-back programme of the company," it said in a statement. On August 18 also,the company has bought back five lakh equity shares of the company from the open market. Reliance Infrastructure's Rs 1,000-crore buy-back plan is aimed to reduce short-term volatility in its share price and discourage speculative activity in its stocks. Since the launch of the programme in April 11,the firm has so far bought back 34.79 lakh equity shares for Rs 192.96 crore,it added. Shares of Reliance Infrastructure today closed at Rs 416.7 on BSE,down 6.95 per cent.