BlockBeats news, on July 11, according to Decrypt, documents submitted by Vanguard Group, the world’s second largest fund management company, to the U.S. Securities and Exchange Commission (SEC) showed that it currently holds shares in Bitcoin mining companies. It has increased to approximately US$560 million, including increasing its holdings in Marathon Digital stock MARA by 60%, from 10.9 million shares to 17.5 million shares (approximately US$280.5 million); and increasing its holdings in Riot Blockchain stocks by 18%, from 15.2 million shares to 17.9 million shares. shares (approximately $281 million).