Uphold has launched a new trading service allowing U.S. customers to trade over 4,000 stocks and ETFs with fractional share capabilities. The platform plans to offer 24/5 trading hours on weekdays. Crypto-to-stock trades involve converting digital assets to U.S. dollars, with Uphold Securities Inc. managing fractional trading and Uphold HQ, Inc. handling crypto transactions. Users will incur a conversion fee for these trades.