EPAM Systems' stock has taken a dramatic hit, plunging over 17% following a disappointing guidance outlook for 2026, despite reporting strong fourth-quarter revenue growth of 12.8% amounting to $1.41 billion. The company surpassed earnings expectations with an adjusted EPS of $3.26, but concerns about future performance, including the ramping down of its largest client NOERIS and expectations of slower growth, have significantly affected investor confidence. As a result, EPAM now faces mounting challenges within the S&P 500.