Germany's DAX index further retreated, closing approximately 1.3% lower at 23,734 on Thursday — a level not seen since September 25. This decline mirrored the movements of European and U.S. markets. Market sentiment dampened due to renewed concerns over potentially inflated valuations of AI-related stocks, raising fears of a possible AI bubble. Investors also assessed a new batch of corporate earnings and economic data from Europe. German industrial output grew by 1.3% in September, following a revised 3.7% drop in August, though this recovery fell short of the anticipated 3% growth. Heidelberg Materials was the biggest laggard on the index, plunging nearly 5% after its third-quarter 2025 results met overall growth and profitability expectations but showed uneven regional performance. Commerzbank shares declined 2% after the German bank reported a surprising 7.9% year-on-year decrease in net profit. Conversely, Deutsche Post saw an 8.6% jump, as it announced a 7.6% increase in EBIT, which counterbalanced a 2.3% fall in Q3 revenue attributed to currency fluctuations.