European bank stocks are facing a sharp reversal after a 13-quarter winning streak, with Deutsche Bank shares down 25% and Barclays down 20% year-to-date. The Stoxx 600 Europe Banks index has fallen 7% in 2025, threatening to end a three-year rally that began in late 2022. Investors had seen bank valuations more than double as the sector weathered the 2023 regional banking crisis and last year's tariff-driven selloff.

Behind the sector's downturn is a confluence of factors, with the Middle East conflict emerging as the primary catalyst. The war that began when the U.S. and Israel attacked Iran in February has dramatically shifted investor sentiment. What started as optimism for European growth in 2025—fueled by expected German government spending and AI efficiencies—has been replaced by concerns about economic growth and inflation. Over the past month alone, the bank index has dropped 12%.

The reversal highlights banks' particular vulnerability to economic shocks given their sensitivity to growth and interest rate expectations. As the sector approaches its first quarterly decline in years, the question becomes whether this represents a temporary correction or a more fundamental shift in market dynamics.