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This paper aims to enrich the scope of the influence of media reports on the stock risk, and it also provides a path to support the research on the relationship between media reports and idiosyncratic risks in the stock market.

The authors select financial restatement samples of listed companies in China from Jan 2015 to Dec 2017 to explore the impact of the financial restatement on the idiosyncratic risk of stocks. Further, the financial restatement that has more media attention may play a more significant role in promoting the idiosyncratic risk.

The authors found that the financial restatement of listed companies has a significant positive effect on the idiosyncratic risk of stocks. Specifically, the idiosyncratic risk changed five months before the restatement. After the restatement, the idiosyncratic risk increased by 83.47 in five days then decreased slowly, which lasted about one year. The restatement caused by sensitive issues and legal issues has a greater impact on the idiosyncratic risk. Both current restatement and delayed restatements will increase the idiosyncratic risk of stocks, but the impact of the latter is higher than the former.

Possible deficiencies in the paper are that the number of restatements caused by major accounting errors is low. Therefore, no regular conclusions were drawn on the impact of the financial restatement caused by major accounting errors.

The conclusions provide a basis for targeted supervisory measures on the restatements of listed companies. The increase in financial restatements is closely related to the lack of governance mechanisms in the stock market. For investors, although the mystery of idiosyncratic volatility exists significantly in the market, the company's valuation level will affect the relationship between the idiosyncratic risk and expected return. Investors should pay attention to the intrinsic value of the company and should not blindly pursue stocks with a low idiosyncratic risk.

These conclusions may enrich the scope of the influence of media reports on the stock risk and also provide a path to support the research on the relationship between media reports and idiosyncratic risks in the capital market.