Enron filed for bankruptcy in December 2001. It had grown to be the 7th largest company in the US through energy brokering and trading but collapsed due to accounting fraud. Executives received substantial pay even as the company failed and faced lawsuits for insider trading. An internal whistleblower warned of hidden losses through off-balance sheet entities but the ineffective audit committee failed to investigate. As losses mounted and credit ratings fell, Enron had a cash crisis and finally filed for bankruptcy when its stock price collapsed. The fallout included Arthur Andersen being shut down and criminal charges against top executives.