Nvidia became the first publicly traded company to reach a $5.5 trillion market valuation on May 13, 2026, as its stock price hit a new all-time high. The milestone reflects the ongoing AI infrastructure boom that has driven Nvidia's dominance as the world's most valuable company. This achievement matters because it shows the scale of capital flowing into AI compute — a single company is now worth more than the entire GDP of all but a handful of nations.