7709.HK is trading at HK$43.80, up 3.06% on September 23, 2026, as South Korean semiconductor and global memory-chip shares strengthened amid strong AI-related demand and tight memory supply. - SK Hynix gained alongside Samsung; no new 7709.HK-specific announcement was cited. - The ETF targets twice SK Hynix’s daily performance, so sector gains can be amplified; daily resetting and recent volatility may also contribute.