MrBeast claims he has 'negative money' despite $2.6B net worth — Mark Cuban says that's more common than you'd expect

You might have more in common with billionaires than you think.

"It's funny, talking about my personal finances, because no one ever believes anything I say," said YouTube creator Jimmy Donaldson, more well-known as MrBeast, to the Wall Street Journal earlier this year . "I have negative money right now, I'm borrowing money. That's how little money I have."

The YouTuber is worth approximately $2.6 billion; much of that comes from equity in his $5 billion company, Beast Industries .

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"Technically, everyone watching this video has more money than me in their bank account if you subtract the equity value of my company, which doesn't buy me McDonald's in the morning," said Donaldson in the WSJ interview.

His situation might be more common than you think. Many billionaires are cash poor because they have their wealth tied up in illiquid assets, such as stocks and real estate .

Here's why it's so common for billionaires to be illiquid — and how their situation is different from other "cash-poor" Americans.

Billionaires 'might have 5%' of their wealth in liquid assets if they're 'lucky,' says Cuban

Mark Cuban, who Bloomberg reports has a net worth of over $10 billion , appeared on a recent episode of the podcast Pivot to talk about how liquid billionaires really are in light of a proposed one-time 5% billionaire tax in California .

"People don't realize that a billionaire doesn't mean you have a billion dollars in liquid assets," said Cuban to cohost Kara Swisher. "Chances are, you might have 5%, if you're lucky."

That would leave a billionaire with around $50 million in liquid assets — certainly enough to cover almost anything they'd need, and certainly more than the sub-$1 million Donaldson claims to keep for himself .

But Cuban says that many billionaires don't keep even 5% of their net worth in liquid assets.

"Every situation is different. But I can tell you that the day I became a billionaire I didn't have anywhere close to 5 [percent] in cash," said Cuban in an email to Moneywise. "Most entrepreneurs let their winners ride. Meaning [if] business is good, they will keep on investing, at the expense of their liquidity."