Wall Street’s behemoths just hit a milestone that borders on surreal: the 10 most valuable U.S. companies—including Nvidia Corp. (NASDAQ:NVDA), Microsoft Corp. (NASDAQ:MSFT) and Apple Inc. (NASDAQ:AAPL) and the rest—now hold a combined market cap of $23.9 trillion, making them more valuable than the entire economies of China and Germany combined.

According to the latest International Monetary Fund data, China's gross domestic product stands at $19.23 trillion, while Germany's is $4.74 trillion, making this group of companies collectively more valuable than the world's second- and third-largest economies.

Even more striking, seven of these giants—known as the Magnificent Seven—are responsible for over $20 trillion of that total on their own.

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Nvidia Leads With $4.25 Trillion Market Cap

At the top of the pile sits Nvidia, whose meteoric rise amid the AI boom has made it the most valuable company in the world.

As of ...