South Korean retail investors are trading some popular U.S. leveraged securities without real-time quotes during daytime hours after Blue Ocean ATS (alternative trading system) suspended trading in 18 securities to comply with U.S. Securities and Exchange Commission rules. The suspension began with Monday’s 8 p.m. ET session. Most affected products are leveraged or inverse securities, including Direxion Daily Semiconductor Bull 3X Shares, known as SOXL, and a Direxion Daily MSC product.