Andrew Stuart Fastow is an American former financier who pled guilty to felony securities fraud and other crimes. Fastow was the chief financial officer of Enron Corporation, an energy trading company based in Houston, Texas, until he was fired shortly before the company declared bankruptcy. Fastow was one of the key figures behind the complex web of off-balance-sheet special purpose entities used to conceal Enron's massive losses in their quarterly balance sheets. By unlawfully maintaining personal stakes in these ostensibly independent ghost-entities, he was able to defraud Enron out of tens of millions of dollars.