OpenAI's technological announcements: Market reactions and implications

This research examines the impact of OpenAI’s technological announcements on the stock returns of artificial intelligence (AI) concept stocks and their matched firms in Taiwan’s equities market. Using an event study methodology and regression analyses, the findings reveal significant differences in cumulative abnormal returns (CARs) between AI concept stocks and matched firms, as the former consistently outperform their matched counterparts with the performance gap widening over longer event windows. The analysis highlights the crucial roles of product originality and the level of recognition for AI concept stocks by brokers and stock information websites in shaping investor responses, while R&D expenditures show limited long-term effects. These findings offer valuable insights for firms, investors, and policymakers in navigating the dynamics of innovation-driven growth in the burgeoning AI sector.