At its height until the global financial crisis of 2008 Citigroup was the largest company and bank in the world by total assets with 357,000 employees. In 2007, Citigroup was one of the primary dealers in US Treasury securities.ventually by December 2010, Citigroup repaid the emergency aid in full and the US government received an additional $12 billion profit in selling its shares. US Government restrictions on pay and oversight of the senior management were removed after the US government sold its remaining 27% stake as of December 2010.