Amazon (AMZN -0.70%) stock sold off nearly 10% in the two days after reporting second-quarter 2025 results. It has since recovered some of those losses but remains up just slightly year-to-date -- underperforming the S&P 500 and Nasdaq Composite. Here's why Amazon is out of favor, along with the biggest mistake investors make when buying the growth stock. Amazon has a tendency to bet big on its best ideas, which can test investor patience when results fail to deliver. Meanwhile, Amazon is ramping up spendin ...