Amazon's stock underperformed the market in 2025.Amazon (AMZN +0.38%) has had a fairly disappointing 2025 so far. The stock has risen a mere 6% for the year, lagging the S&P 500 (^GSPC 0.09%), which is up about 16% for the year. That level of underperformance is disappointing for shareholders, but it sets the stage for an exciting 2026.I think that Amazon will come roaring back in 2026, mainly on the back of its strong cloud computing business and advertising services. If its commerce divisions can play a p ...