The State of Michigan Retirement System has become the first public pension fund to invest in Grayscale's Ethereum exchange-traded funds (ETFs).Michigan's pension fund has purchased 460,000 shares in Grayscale's Ethereum Trust (ETHE), valued at $10.07 million.The fund also bought 1.1 million shares in the Grayscale Ethereum Mini Trust (ETH).Michigan now owns more Ethereum than Bitcoin, showcasing a growing interest in diversifying crypto holdings among state pension funds.