San Francisco: Silicon Valley chipmaker Nvidia on Wednesday became the first publicly traded company to surpass a $4 trillion market valuation, putting the latest exclamation point on the investor frenzy surrounding an artificial intelligence boom powered by its industry-leading processors. The milestone reflects the upheaval being unleashed by artificial intelligence, or AI, which is widely viewed as the biggest tectonic shift in technology since Apple co—founder Steve Jobs unveiled the first iPhone 18 years ago.

Underscoring the changing of the guard, AI bellwether Nvidia is now worth $900 billion more than Apple, which rode the iPhone’s success to become the first publicly traded company to valued at $1 trillion, $2 trillion and eventually, $3 trillion. Nvidia’s rise as come as Apple has struggled to deliver on its........

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