Many executives at Enron were indicted for a variety of charges and some were later sentenced to prison. Arthur Andersen was found guilty of illegally destroying documents relevant to the SEC investigation, which voided its license to audit public companies and effectively closed the firm. By the time the ruling was overturned at the U.S. Supreme Court, Arthur Andersen had lost the majority of its customers and had ceased operating. Enron employees and shareholders received limited returns in lawsuits, despite losing billions in pensions and stock prices. The executives all were charged with a felony after the allegations.