The central purpose of this article is to assess whether the newly developed five-factor model of Fama and French (2015) has sufficient power to identify the long-term abnormal performance of firms experiencing major corporate events. In order to check the robustness of the five-factor model, power of the Fama–French three-factor model (1993) has also been investigated. Simulations show that although the five-factor specification is more powerful than the three-factor specification, the extended model still lacks power. The findings further suggest that if the book-to-market factor is excluded from the five-factor model, the four-factor model documents almost similar power like the five-factor model. In addition, the power is found to be substantially reduced as the event period advances.