Chinese e-commerce giant Alibaba Group Holding Ltds management kicked off its two-week IPO marketing blitz on Monday with an early morning presentation to the combined sales forces of its six underwriters. Alibaba is seeking to raise more than $21 billion in an initial public offering that will value the company at up to $163 billion and rank as the largest-ever technology debut in the United States. Alibaba expects to price the IPO at $60 to $66 per American Depository Share. It will list shares on the New York Stock Exchange.