According to global corporate valuation data mentioned

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While Amazon became the largest company by revenue, the most valuable company by market capitalisation was reported to be Nvidia, with an approximate valuation of $4.5 trillion. Market capitalisation represents the total market value of a company’s outstanding shares, which reflects investor expectations about future growth and profitability. Nvidia’s valuation has grown rapidly due to its leadership in advanced graphics processing units (GPUs), artificial intelligence computing hardware, and data centre technologies that support the global AI ecosystem.