SK Hynix Tanks 29.96% on NXT Pre-Market Over Single-Share Order Error, Recovers in 2 Minutes on July 28

According to Yonhapinfomax, SK Hynix plunged 29.96% to 1.272 million Korean won on the NXT pre-market exchange at 8 a.m. on July 28 following a single-share order error, with just one share traded at the limit-down price. The stock recovered to around 1.7 million won within approximately 2 minutes as subsequent buy orders entered the market.

The anomaly stems from NXT's continuous order matching system during thin liquidity hours, as opposed to the Korea Exchange's pre-opening single-price auction. A single investor's order mistake—likely due to incorrect quantity or price entry—triggered the extreme price movement with minimal trading volume.