SAN FRANCISCO — The U.S. Securities and Exchange Commission has accused a former Silicon Valley executive and three associates of insider trading, alleging the group made almost $750,000 in illegal profits in trades from 2009 to 2012.

According to the civil complaint filed by SEC lawyers in the U.S. District Court for the Northern District of California on Thursday, Christian Keller, a former financial analyst at Applied Materials Inc. and vice president for investor relations and finance at Rovi Corp., tipped a friend about confidential financial information in advance of four trades.