Some billionaire hedge fund managers are using a popular ETF to gain exposure to Bitcoin.

According to a growing number of Wall Street experts, Bitcoin ( BTC -2.88% ) could hit a price of $1 million within just five years. Given Bitcoin's current price of $108,000, that's an incredible 825% increase in price within a relatively short period of time.

It's no wonder, then, that billionaire investors are buying Bitcoin in size. But they're not buying Bitcoin directly in the crypto market. Instead, they're investing via a BlackRock (NYSE: BLK) exchange-traded fund (ETF) -- the iShares Bitcoin Trust ( IBIT 4.08% ) -- that gives them direct exposure to the price of Bitcoin.

Billionaires who own the Bitcoin ETF

Leading the way is British billionaire Alan Howard of Brevan

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