In 2021, bitcoin and ether have seen huge rallies. In April 2021, the cryptocurrency market topped $2 trillion in value for the first time.
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CNBC's Jim Cramer said Monday he recently added to his holdings of ether, the world's second largest cryptocurrency by market value.
The "Mad Money" host had trimmed his position in ether — which runs on the Ethereum blockchain — in early May after the digital currency hit what was then a series of record highs.
"I went back into Ethereum because bitcoin held [$30,000]," Cramer said on "Squawk Box," referencing bitcoin's stabilization above that key support level after the cryptocurrency briefly plunged below $29,000 last week.