McAfee's MGT sinks 21 percent after NYSE refuses share listing

By Noel Randewich SAN FRANCISCO (Reuters) - Shares of MGT Capital Investments , led by anti-virus software pioneer John McAfee, dropped 21 percent on Tuesday after it said the New York Stock Exchange denied approval of the listing of shares for a planned merger with anti-spyware company D-Vasive Inc. The steep plunge in MGT brings its losses over two days to about 40 percent after the company said on Monday it had received a subpoena from the U.S. Securities and Exchange Commission. In May, MGT