And Gupta used to be the top executive at the world's most prestigious consulting firm, McKinsey & Co., which has a director who pleaded guilty in the Galleon case. This raises the question of how deeply insider trading is embedded in our financial markets and corporate governance at the highest levels. According to The Wall Street Journal, Gupta, McKinsey's former worldwide managing director and a Goldman director since 2006, is being probed by federal prosecutors. They're trying to find out whether Gupta shared insider information about Goldman with Raj Rajaratnam, who ran $3.7 billion hedge fund Galleon and has been accused of insider trading in at least 20 stocks, including Goldman's. Prosecutors allege Rajaratnam conspired to obtain nonpublic information about Goldman earnings in June and December, 2008, and Berkshire Hathaway's ( BRK.A ) September, 2008, investment in Goldman before their public announcement.