As Alibaba Prepares for IPO, Tech Stocks Retreat It's a tough time for a tech debut. As e-commerce giant Alibaba gets ready for a blockbuster stock sale in the next few months, technology shares are retreating. For two years, investors bid up biotechnology and internet companies, enticed by their strong growth prospects in an otherwise weak U.S. recovery. But they have sold off those stocks since late February, realizing they can find better value elsewhere. So-called ...