The Korea Exchange's new after-hours market recorded 1.82 trillion won ($1.3 billion) in turnover and traded 72.24 million shares on September 14, its opening day. The four-hour session runs from 4 p.m. to 8 p.m. with continuous trading in Kospi-listed stocks. Volatility mitigation device triggers reached 1,637, or 80.4% of the day's total, compared with 400 during regular trading and a September daily average of 391. Thin order books and limited participation intensified price swings, particularly during the first hour, when 80.1% of after-hours triggers occurred. The exchange said the safeguards were functioning as intended and plans a market-making system for low-liquidity stocks while it monitors whether the market stabilizes through sufficient trading activity rather than simply becoming quieter.