Symantec Corporation is an American software company headquartered in Mountain View, California, United States. The company produces software for security, storage, backup and availability - 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).