European stocks traded slightly lower on Wednesday, with the EURO STOXX 50 falling 0.1% and the STOXX 600 declining 0.2%, as investors assessed a fresh batch of corporate earnings while remaining cautious ahead of the Federal Reserve’s monetary policy decision later in the day. BNP Paribas was little changed after reporting a surge in revenue. Banco Santander dropped 3.2% after reporting a decline in net profit, while UBS fell 2% despite delivering net earnings in line with expectations. GSK tumbled 4.1% as its results disappointed investors, despite a slight earnings beat. Mercedes-Benz slipped 0.1% after reporting a sharp decline in third-quarter car sales and lowering its guidance. In contrast, Deutsche Bank gained 3.2% after posting an annual increase in profit.