NVIDIA commands a 61.5% implied probability on Polymarket as the largest company by market capitalization at end-December 2026, reflecting trader consensus on its sustained AI-driven dominance, with current market cap at approximately $4.3 trillion surpassing Apple's $3.7 trillion and Alphabet's $3.5 trillion as of late March 2026. Explosive data center revenue growth—up over 65% in fiscal 2026—fueled by unrelenting demand for GPUs amid the generative AI boom has widened NVIDIA's lead, while Apple contends with maturing iPhone sales and Alphabet benefits from cloud acceleration but trails on valuation multiples. Recent global tensions caused a flat-to-8% pullback in mega-cap tech over the past 20 days, yet NVIDIA's profit trajectory and upcoming quarterly results position it as the frontrunner, with key thresholds near $5 trillion market cap in focus for year-end resolution.