Samsung Electronics shares suffered a brief pre-market flash crash on May 26.
The stock fell nearly 20% on the Nextrade alternative exchange. The price dropped to 240,000 won. The previous day's close was 292,500 won. This transaction involved a volume of only 27 shares.
A volatility interruption mechanism activated during the plunge. The stock recovered quickly and closed higher during the regular trading session.
An order mistake likely caused the incident. Thin liquidity and the pre-market continuous trading system magnified the drop.
The event caused temporary investor confusion. It amplified concerns about price distortions on alternative platforms as South Korea considers extending market trading hours.