NVIDIA commands a 90.5% implied probability as the world's largest company by market cap at April's end, anchored by its current $4.1 trillion valuation—over $400 billion ahead of Apple's $3.7 trillion—fueled by unrelenting demand for its AI GPUs in data centers. Recent GTC 2026 keynotes, unveiling the Vera Rubin architecture and projecting over $1 trillion in cumulative AI infrastructure revenue through 2027, solidified trader consensus on sustained dominance amid expanding enterprise software ecosystems. While regulatory scrutiny or custom chip advances from hyperscalers pose long-term risks, short-term challenges like a blockbuster Apple earnings report in late April or broader AI hype cooldown could narrow the gap, though traders see slim odds of reversal given the one-month horizon.