DoubleLine Capital CEO Jeffrey Gundlach said Monday that he "absolutely" believes the S&P 500 will go below the lows that the index hit early in 2018.
"I'm pretty sure this is a bear market," Gundlach told Scott Wapneron CNBC's "Halftime Report."
"We've had pretty much all of the variables which characterize a bear market," Gundlach added.
The S&P 500 is not in a bear market yet, down 11 percent from its record high reached in September. Wall Street traditionally defines a bear market as a decline of 20 percent or more. The S&P 500 fell as low as 2532.69 in February, a little more than 2 percent lower from where it is now.
Stocks fall into a bear market typically after "something happens that doesn't make any sense at all," Gundlach said. Cryptocurrency is the "mania" this time around, he said. Gundlach said bitcoin is an indicator of the market getting ahead of itself, much like during the dotcom bubble when technology companies "were being IPO'd that had no sales" or in 2006 when subprime lending "went on longer than it should have."
Bitcoin began to fall early in 2018. "One after another you start to see various sectors of the market give it up" after cryptocurrencies sold off heavily, Gundlach said.