The ruling Communist Party has decided that Xiao Gang will be "dismissed" from the top position at the China Securities Regulatory Commission, the official Xinhua news agency said.
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Liu Shiyu, the current head of Agricultural Bank of China - one of China's top four banks - will replace Xiao, it said.
In mid-2015, Xiao oversaw a rout on China's exchanges, with the benchmark Shanghai index plummeting by almost a third, wiping trillions of dollars from market valuations and jolting global markets.
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The plunge was triggered when regulators changed the rules on traders' use of borrowed money, bursting a debt-fuelled bubble that had seen the Shanghai index surge 150 percent in the year to mid-June.
Calls for his departure have been heard regularly since the debacle and heated up in early January after the CSRC?s deployment of a "circuit breaker" closed the Shanghai and Shenzhen exchanges early twice in the four days it existed, again roiling global markets.
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