The primary purpose of this research is to examine the stock price of a company's shares, which has brought negative information available on the Indonesia Stock Exchange (IDX) to the case of any company. One of many go-public companies' corporate name is PT X. One of its subsidiaries is PT Y, the eSAF frame manufacturer for motor vehicles. This study employs a normative legal approach using library research techniques as the data collection method and analyzes two approaches in research methods: statute and conceptual. The results show that a good quality product leads to negative publicity for the firm, which in turn results in the selling of shares by investors, leading to a fall in PT X stock prices. This paper emphasizes negative news flow regarding stock prices and approaches it from both the stock and investor perspective. The research's contribution focuses on the relations between corporate news, investors, and stock market activity, looking at the example of the Indonesian market, which has practical value for investors, companies, and market regulators. The eSAF frame was one of the reasons, though attention towards the weight and corrosion resistance properties was highlighted. The outcome of this situation was the declining prices of PT X stock because the negative news caused investors to pull out their investments in PT X shares. This shows that share prices quickly move in the direction of the news, especially bad news, and the investors' perception of the company regarding market performance.
