Goldman Sachs significantly increased its holdings in BlackRock's Ethereum spot ETF (ETHA) during the third quarter, purchasing approximately 17.4 million shares. This acquisition brings Goldman's total holdings to about 42.3 million shares, making it the largest institutional holder of the ETF. Meanwhile, Millennium Management acquired around 28.1 million shares in the same period, with a total holding of approximately 33.9 million shares, positioning it as the second-largest holder.