The United States Securities and Exchange Commission (SEC) has reportedly requested that would-be issuers withdraw their 19b-4 filings for XRP, Solana (SOL), Cardano (ADA), Dogecoin (DOGE), and Litecoin (LTC) exchange-traded funds (ETFs). According to Crypto America journalist Eleanor Terrett, issuers will start withdrawing their 19b-4 filings as early as this week, suggesting it could only be a matter of time until such altcoin ETFs make their Wall Street debut.