Xu's arrest is the latest in a string of cases targeting traders involved in the summer meltdown in Chinese stocks.
A squad of Chinese highway patrol cars on Sunday sealed off the Hangzhou Bridge in eastern China for more than 30 minutes while officers surrounded Xu's car, eventually leading the Armani-clad billionaire off in handcuffs.
Simultaneously, police moved in on Xu's company offices in Shanghai and Beijing, confiscating documents and computers as well as interviewing employees, Hong Kong-based South China Morning Post reported today.
Over USD 3.2 trillion losses were reported resulting over 20 million small investors deserting China's stock market.
Xu and several other executives of Zexi were arrested on charges including insider trading and stock market manipulation, the Post quoted official media as reporting.
Many had thought Xu was in the clear after an earlier interrogation by regulators over suspicious trades following the boom-to-bust cycle in the A-share market in mid-June.
"It was widely believed that he was safe after being interrogated," the fund manager said.
"He understands the rules better than any other fund manager and it should have been difficult for police to spot his illegal behaviour."
Zexi's hedge funds recorded at least 140 per cent growth in net asset value this year, making the company controlled by Xu the standout performer in the mainland's securities industry.
"His detention shows there is no God in this market at all. It was the inside information and conspiracy that helped him to make a killing," Zhou was quoted by the Post as saying.
The benchmark indicator jumped nearly 120 per cent between October 2014 and mid-June 2015 before slumping more than 32 per cent in three weeks.
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