China Securities Regulatory Commission (CSRC) in a statement said that punishment on insider trading will become more harsh in order to "purify" the capital market environment.
More efforts will be made to clamp down on the leaking and prying of non-public information involved in securities trading, it added.
The commission has busted 20 cases of insider trading this year and penalised one institution and 31 individuals, state-run Xinhua news agency reported.
The number of small investors holding stocks in their accounts slid to 51 million at the end of July from 75 million in June, China Securities Depository & Clearing Corp, the government agency that tracks accounts said.
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Shanghai Composite Index plunged 14 per cent, a record single month drop in six years.
Unlike institutional investors dominated US stock market, small and individual investors are major players in Chinese stock market, state-run China Daily reported.
China has pressed in police to investigate massive stock market crash wiping about USD 3.2 trillion of capital. Official media put the losses around USD 1.1 trillion.
Since the start of market plunge after it hit peak in mid June, government rolled out series of easing policies and measurement, but the results have had limited impact.
Despite stocks becoming cheaper due to market plunge, fewer people are entering the market. Compared to June, 20 per cent fewer new accounts were created in July, the report said.
Due to recent volatility, it is unlikely that many families will move their money from saving account to stock market.