The Cboe BZX exchange has filed four 19b-4 filings with asset managers Bitwise, VanEck, 21Shares and Canary Capital to list the spot Solana exchange-traded fund (ETF) - the same day the chairperson of the Securities Exchange Commission confirmed he would step down in January. If approved, the spot Solana ETF issued by Bitwise, VanEck, 21Shares, and Canary Capital will be listed on the US-based Chicago Board Options Exchange's (CBOE) BZX exchange.