Factoring financing is the most widely used form of supply chain finance, which has been adopted by more and more enterprises. The existing literature focuses on the motivation of suppliers to adopt factoring financing and the factors that affect the development of factoring. However, little attention is paid to the results of factoring. This study uses the event study method, draws on the Extended Resource based theory (ERBT), discussing how the factoring business announcement affects the stock market value of listed companies from the perspective of competitive advantage and the firm's own characteristics. By manually collecting 205 factoring business announcements from 115 Chinese listed companies from October 2019 to December 2022, we found that: (1) from the perspective of competitive advantage, the announcement of factoring business by non-Combination of Industry and Finance enterprises or their holding enterprises has more positive impact on the stock price of the enterprises. There is no obvious relationship between the size of factoring quota and stock price. (2) From the perspective of the enterprise's own characteristics, the announcement of factoring business by state-owned enterprises and small-scale enterprises can have a positive impact on the stock price of the enterprise. Before and after the Civil Code came into effect, there was no significant difference in the relationship between factoring business announcements and stock prices. This study uses secondary data to fill the gap in the study of the impact of factoring announcements on stock market value. This paper discusses the relationship between factoring business announcement and stock market value from the perspective of competitive advantage for the first time, providing theoretical guidance for managers to adopt factoring business under what circumstances. In addition, this study also provides documentation for the empirical study of factoring business announcements in China.