Alibaba Group said on Wednesday it will buy all the remaining shares of mobile browser firm UCWeb in the biggest merger in Chinese internet history, as the e-commerce giant steps up its spending spree ahead of its U.S. listing.
Alibaba's latest deal, hot on the heels of a string of investments which already total $4.8 billion in the past six months, will be larger even than Baidu's $1.9 billion acquisition of 91 Wireless last year, Alibaba said.
Read MoreAlibaba: A blend of East and West
Alibaba's investment in UCWeb emphasizes the company's push to do more business on mobile in the world's biggest smartphone market. But rival Tencent Holdings, China's biggest listed Internet firm, dominates smartphone screens with its near-ubiquitous mobile messaging app WeChat, a situation which Alibaba executives have publicly railed against.
"This integration will create the biggest merger in the history of China's Internet," Alibaba said on its microblog.