Employees play table tennis inside the headquarters office of Alibaba (China) Technology Co Ltd on the outskirts of Hangzhou, Zhejiang province May 21, 2012. Chinese Internet entrepreneur Jack Ma is buying back up to half of a 40 percent stake in his Alibaba Group from Yahoo Inc for $7.1 billion, in a deal that moves the Chinese e-commerce leader closer to a public listing.[Photo / Agencies]