An employee walks past a wall painted with the logo of Alibaba (China) Technology Co Ltd at its headquarters office 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]