This dissertation project explores the complex field of sustainable finance, focusing on the impact of EU regulations on the financial sector. It consists of three papers. The first paper employs bibliometric methods to analyze how academic research addresses EU regulations on sustainable finance. It identifies key research clusters and highlights how EU policies shape research agendas. The second paper examines the impact of the Corporate Sustainability Due Diligence Directive (CSDDD) announcement on the stock returns of European companies, analyzing the relationship between ESG practices and stock price resilience. The third paper compares the financial performance and sustainability of investment funds according to Articles 8 and 9 of the SFDR regulation. It investigates whether "dark green" funds (Article 9) exhibit higher financial and sustainability performance than "light green" funds (Article 8).