Apple closed Tuesday trading with a market capitalization of roughly $4.995 trillion, edging past Nvidia's approximately $4.768 trillion valuation and reclaiming the title of world's most valuable public company by a margin of about $227 billion.

The shift comes just as Nvidia shares have pulled back on investor concern over the chipmaker's financing obligations, including a reported $250 billion financial backstop tied to OpenAI's data-center buildout, while Apple's stock has climbed on a reassessment of its comparatively cautious AI spending.

black flat screen computer monitor
Photo by Aidan Tottori on Unsplash

Markets are pricing in a real race

On Polymarket, traders are treating the question of which company ends July as the larger of the two as a live bet rather than a formality. A contract asking whether Apple will finish the month as the most valuable company had drawn about $4.7 million in trading volume, with Apple priced at roughly 79% to hold the top spot against about 22% for Nvidia. The market resolves based on market capitalization at the close of trading on July 31.

Two very different AI stories

Nvidia's recent numbers still show explosive demand for its hardware: data-center revenue rose 75% to $62.3 billion in its most recently reported quarter. But the stock has come under pressure as investors weigh the scale of financial commitments the company is making to sustain that growth, including its exposure to OpenAI's infrastructure spending.

Related: Nvidia Sheds 5% on Report of $250B OpenAI Data-Center Guarantee

Apple, by contrast, spent roughly two years being criticized for moving slowly on generative AI. It unveiled a rebuilt version of Siri in early June with more conversational capabilities, leaning partly on outside models alongside smaller systems that run directly on its devices rather than building out massive proprietary data centers of its own.

The narrative has flipped

That more conservative approach now reads differently to some investors. As one market observer put it, "Apple spent the past two years being mocked for arriving late to artificial intelligence. Suddenly, not writing blank checks for giant GPU farms looks less like incompetence and more like risk management."

The next major catalyst arrives Thursday, July 30, when Apple reports fiscal third-quarter earnings after market close. Depending on how that report lands, and how Nvidia's financing exposure continues to be perceived, the gap between the two companies could widen or reverse again before the Polymarket contract settles at month's end.