While China Hongqiao Group may be best known for being the world's largest aluminum producer, it has in recent months featured just as prominently among short-seller reports who have accused the company of being a fraud. As the WSJ's Scott Patterson writes, questions about China Hongqiao's finances first emerged in November, when an anonymous short seller wrote on a website called Hongqiao Exposed that the company's profits are "too good to be true." China Hongqiao in the March 31 statement called the report "untrue and unfounded." A subsequent 46-page report on Feb. 28 by Emerson Analytics, a trading firm focused on Chinese stock-market fraud, disclosed more allegations of fraud involving the Chinese commodity giant.