The news is the latest sign of skyrocketing valuations for privately held AI start-ups, which show growing investor enthusiasm for AI and confidence that companies like Anthropic will justify that valuation over the long term, eventually generating billions in profits.

Nvidia is once again the most valuable U.S. company, outranking Apple for the first time since late November. A rise in the chip maker's stock meant it ended Tuesday with a market capitalization of $3.

Now that it's the world's most valuable company, some investors might believe the time to buy Nvidia has already passed, but these developments show that's not the case. Furthermore, the stock is currently selling for just 32 times next year's expected sales, a remarkably attractive price for a company with so much opportunity.

Nvidia is once again the most valuable U.S. company, outranking Apple for the first time since late November. The chip maker ended Tuesday with a market capitalization of $3.449 trillion, according to Dow Jones Market Data.

Nvidia has reclaimed its position as the world’s most valuable publicly traded company, surpassing Apple in market capitalization on Tuesday. At the close of trading, Nvidia’s market cap reached approximately $3.