Regulators need to stop "blind expansion" by financial firms, the deputy chairman of the China Securities Regulatory Commission, Li Chao, said at a news conference.
People in financial industries have warned insurance companies and others are making dangerously aggressive investments in stocks and real estate. On Friday, the chairman of a life insurer was banned from the industry for violating limits on investing.
The markets are largely sealed off from global capital flows but Beijing is gradually easing barriers to foreign investors owning Chinese stocks.
In 2015, share prices surged and then collapsed, wiping trillions of dollars off stock value and battering small investors.
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That was a "hard lesson" that regulators need to improve their ability to keep track of what brokers and investors are doing, Li said.
Markets have stabilised since the crash, allowing companies to resume raising money in stock offerings, said the agency's chairman, Liu Shiyu. He said 248 companies raised 163 billion yuan (USD 24 billion) last year.
Liu was appointed in February 2016 after his predecessor was fired following the market plunge. At the same time, said Li, regulators imposed more than 200 administrative measures last year against securities firms, fund managers and others who were found to be acting improperly.
On Friday, the country's insurance regulator said the chairman of Foresea Life Insurance Co., Yao Zhenhua, was banned from the industry for 10 years.
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