Grayscale has filed to convert its Solana Trust (GSOL) into an exchange-traded fund (ETF). The 19b-4 filing was made to NYSE Arca, the exchange where the fund will be listed. Grayscale is the fifth asset manager to file to launch a Solana ETF, following Bitwise, VanEck, 21Shares, and Canary Capital. Solana has gained more than 130% year-to-date.