China Zhongwang Holdings Chairman Liu Zhongtian smiles during the debut of Zhongwang Holdings at the Hong Kong Stock Exchange May 8, 2009. Shares of China Zhongwang Holdings, Asia's largest maker of aluminium extrusion products, fell about 2 percent in their Hong Kong trading debut on Friday after the company raised $1.3 billion in the world's biggest IPO since August. REUTERS/Bobby Yip (CHINA BUSINESS)