NVIDIA commands a trader consensus of 99% implied probability as the world's largest company by market cap at April's end, anchored by its $4.83 trillion valuation—nearly $800 billion ahead of Alphabet at $4.05 trillion and over $900 billion beyond Apple. This positioning stems from a 19% stock surge this month amid booming demand for NVIDIA's AI accelerators like Blackwell GPUs, powering data center expansions at hyperscalers, coupled with analyst upgrades forecasting 60%+ EPS growth in fiscal 2026. With just two weeks to month-end close, overtaking requires improbable 20%+ rival gains without NVIDIA pullback. Realistic challenges include a broader AI sector correction, antitrust scrutiny, or accelerated competition from custom silicon by Microsoft and Amazon, though traders dismiss these as low-probability near-term risks.