South Korean stocks have delivered 100% gains in 2026, a rally that outpaces the historic run-ups that preceded the dotcom bubble burst and the industrial boom of the late 1980s. The surge has turned this year into one of the most remarkable periods for the nation's equity market in recent memory.

The rally eclipses previous benchmarks that investors once considered extreme. Gains before the dotcom era and during the late 1980s industrial expansion set high bars, yet 2026 has cleared both. Strong capital inflows and renewed confidence in South Korean assets have fueled the advance.

For foreign and domestic investors, the 100% return raises questions about sustainability and valuations. The dotcom comparison is especially relevant, as similar euphoria preceded a sharp correction. Market participants are watching whether this rally holds or whether history repeats.