Xi Jinping decided to halt Ant IPO: report

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China's President Xi Jinping personally decided to pull the plug on Ant Group's $US37 billion ($A51 billion) initial public offering, the Wall Street Journal reports.

The decision to stop what would have been the world's largest ever IPO, came days after the fintech giant's billionaire founder Jack Ma launched a public attack on the country's financial watchdogs and banks.

President Xi ordered Chinese regulators to investigate and effectively shut down Ant's stock market flotation, the report said.

Ant Group did not immediately respond to a request for comment. The Information Office of the State Council, China's cabinet, could not be reached immediately for comment.

Thursday's edition of the Wall Street Journal cited Chinese officials with knowledge of the matter.

Ma had told a summit in Shanghai on October 24 the regulatory system was stifling innovation and must be reformed to fuel growth.

Earlier this month, it was reported that the speech set off a chain of events that torpedoed the listing of Ant.

Soon after Ma's scathing speech, state regulators started compiling reports including one on how Ant had used digital financial products like Huabei, a virtual credit card service, to encourage poor and young people to build up debt.

The general office of the State Council compiled a report on public sentiment about Ma's speech and submitted it to senior leaders including President Xi.