STMicroelectronics is trading at €40.30, down 4.10%, as renewed concerns about AI investment sustainability and profitability weighed on European chip stocks. - STMicroelectronics was among semiconductor shares reported down more than 3%. - No company-specific announcement explaining the October 22 move was identified; its investor-relations calendar lists Q3 2026 results for October 29. - Broader risk-off conditions may have added pressure, though sector weakness is the clearest available explanation.