Wang Xiaochuan, CEO of China's search engine Sogou, bought 2,016,400 Class A Ordinary Shares, increasing his holdings to 5.3 percent of all Sogou's outstanding shares, according to a filing to the US Securities and Exchange Commission on Dec 4.

The proportion of Wang's shareholding was 4.9 percent when the Beijing-based company debuted on the New York Stock Exchange last month. He expressed his confidence in Sogou on the listing day, saying "both Sogou's services and revenues are in a very healthy condition".