KORU plunged 12.8% to $529.95 today, driven by a broad selloff in South Korean semiconductor and technology stocks. - This rapid decline follows a negative market reaction to Samsung Electronics' earnings, despite strong preliminary results, due to profit-taking and valuation concerns. - Adding to the pressure, Morgan Stanley issued a downgrade, recommending reduced exposure to memory semiconductor stocks like Samsung and SK Hynix, fueling further foreign selling. - As a 3x leveraged ETF tracking the MSCI South Korea index, KORU experienced amplified volatility from the tech sector's weakness, extending a multi-day downward trend for the South Korean market.