The newly launched after-hours trading market on the Korea Exchange (KRX) showed high volatility in its first week, mainly due to relatively low liquidity and a high concentration of retail investors. According to KRX data, from September 14 to last Friday, the daily average trading volume during the 4-8 PM after-hours session was 54.85 million shares, valued at 1.1 trillion Korean won (approximately $811 million), accounting for 4.6% of the total market trading value. During this period, a total of 5,354 volatility interruptions occurred.