Frankfurt's DAX slightly surpassed 23,100 on Monday, extending its winning streak to nine sessions. Investors analyzed developments concerning trade tariffs and corporate earnings while anticipating significant central bank decisions later this week. Rheinmetall led the index with a 2.5% increase, fueled by optimism ahead of its earnings announcement. Siemens Energy and Zalando are also set to disclose their quarterly results this week. In the meantime, Audi, the premium brand of Volkswagen, reaffirmed its full-year forecast without factoring in the potential effects of U.S. tariffs, after posting a 12.4% increase in Q1 revenue, driven by increased sales of electric vehicles.