In this undated file photo, an employee walks out of the Baidu headquarters in Beijing. (FAN JIASHAN / FOR CHINA DAILY)

HONG KONG - Chinese search engine Baidu Inc will launch its Hong Kong secondary listing on Friday and will sell around 4 percent of its shares, which at current price will raise at least US$3 billion, two sources with direct knowledge of the matter told Reuters.

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The sources could not be named as the information has not yet been made public and the company declined to comment.

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