The introduction of a gender quota requirement as a means to increase the gender diversity on company boards is a controversial issue that has been widely debated in recent years. In 2003 Norway, as the first country in the world, introduced a gender quota law and in the following years more countries followed suit. In this paper we examine both the long-term and the short-term effects of the implementation of the Norwegian gender quota law in order to thoroughly investigate the relationship between the requirement and, financial performance and firm value. We perform a...