Billionaire entrepreneur Mark Cuban said Sunday that Elon Musk's trillionaire status is the result of millions of Americans investing in the stock market, arguing that ordinary investors, not billionaires themselves, are the driving force behind wealth creation in the U.S. economy.

Responding to a post on X comparing capitalism and socialism, Cuban argued that roughly 150 million Americans own stocks, effectively tying their financial futures to the success of companies led by entrepreneurs such as Musk.

The 150 Million Investor Argument Cuban argued that critics of billionaire wealth often overlook the role ordinary investors play in creating it, highlighting that millions of Americans voluntarily allocate money to stocks, ETFs and retirement accounts in search of higher returns.

"Effectively believing that Elon Musk and many billionaires could make them wealthier and help them achieve a better life," Cuban said on X.

The comments come just days after SpaceX's (NASDAQ:SPCX) IPO helped make Musk the world's first trillionaire, with the company's valuation climbing above $2 trillion.