Big builder KB Home revealed in a Securities Exchange Commission filing that the federal regulator is examining the company’s accounting. The stock fell about 6% today. The filing doesn’t offer much information. A spokesperson says: “KB Home strives to operate its business with the utmost transparency and integrity, and in accordance with generally accepted accounting principles. While the SEC has not specified the subject matter and we cannot speculate on it at this time, we understand that part of the SEC’s mandate is to conduct these sorts of investigations, which it has done with hundreds of public companies over the past few years.” KB is still dealing with the legal fallout of some of its previous business practices. In 2006, then ceo Bruce Karatz resigned in a scandal involving the back dating of stock options. He later paid $7 million to settle charges with the SEC, but the company is still wrestling with shareholder suits regarding the matter. In 2005, KB paid $3.2 million to settle complaints its mortgage unit was qualifying buyers for government loans who didn’t meet the criteria.