SEC filings reveal that BlackRock has invested almost $400 million into Riot Blockchain and Marathon Digital Holdings stock.
source https://cointelegraph.com/news/blackrock-etfs-hold-384-million-of-shares-in-bitcoin-mining-firms
BlackRock ETFs hold $384 million of shares in Bitcoin mining firms
source https://cointelegraph.com/news/blackrock-etfs-hold-384-million-of-shares-in-bitcoin-mining-firms
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