Symantec Corporation is an American software company headquartered in Mountain View, California, United States. The company produces software for security and offers professional services to support its software. Netcraft assesses Symantec (including subsidiaries) as the most-used certification authority. Symantec is a Fortune 500 company and a member of the S&P 500 stock-market index. The company also has development centers in Pune, Chennai and Bengaluru (India).