On June 28, REX Shares issued a document on the X platform announcing that the Solana pledged ETF "REX-OspreySOL+ Staking ETF" will be launched soon. It is reported that the ETF aims to track Solana's performance and generate revenue through on-chain pledges. It is said that the ETF is also the first pledged cryptocurrency ETF in the United States. In addition, Bloomberg senior ETF analyst Eric Balchunas disclosed on Platform X that the U.S. Securities and Exchange Commission said there was no further comment, so it seemed they were ready to launch. Earlier, the U.S. Securities and Exchange Commission (SEC) issued a warning to REX Shares and Osprey Funds, saying that its proposed pledged Ethereum and Solana ETF may not meet the definition of "investment company" in the Investment Company Act and fail to meet the legal compliance requirements of ETFs.