After political turmoil pushed it down in 2024,1 South Korea recovered and was the best-performing equity market globally in 2025 (as measured by the S&P Korea BMI), and it has continued to outperform as of August 2026 (up 78.7% YTD versus 14.8% for the S&P Global BMI). The performance of the stock market has fluctuated over the years, but one debate has remained constant: South Korea’s market classification. Whether South Korea is classified as a developed market or an emerging market can materially affect country weights in an index. A 2020 Indexology® Blog post2 explored how the inclusion of South Korea in emerging market indices could crowd out less-developed countries. Six years later, what has changed?
To answer that, it helps to revisit South Korea’s classification. Since 2001, S&P Dow Jones Indices (S&P DJI) has classified South Korea as a developed market, a decision reaffirmed over the years based on feedback from a wide range of market participants. Since 2020, the South Korean economy has remained healthy, with GDP growing an average of 2.3% annually3 and its GDP per capita holding steady alongside the levels of other developed markets (see Exhibit 1).

Consistent with this, the float-adjusted market capitalization (FMC) of the S&P Korea BMI went from USD 0.91 trillion on Dec. 31, 2024, to USD 2.98 trillion as of Aug. 31, 2026. Even as the amount of foreign capital entering the stock market has grown,4 the government has released a series of reforms aimed at further enhancing its accessibility and liquidity.5, 6, 7 Still, not all index providers share the same classification perspective, reflecting different market expectation frameworks. Let’s look at how South Korea’s inclusion impacts the composition of indices.
Amid the outperformance of South Korean equities, the market’s footprint on global benchmarks has increased. As of the end of August 2026, South Korea represented 2.7% of the total FMC of the S&P Developed BMI, up from 2.2% in December 2020. However, its weight has grown even more sharply when placing it within an emerging market classification. In the S&P Emerging Plus AllCap Index, which includes South Korea, the country’s weight went from 14.3% to 18.6% over the same period. As South Korea’s weight has increased, so has its crowding-out effect (see Exhibit 2). When including South Korea in emerging market indices, weight in other less-developed countries is reduced.

The soaring of South Korean equities can mainly be attributed to the hardware and semiconductor industries, which have outperformed in the country amid growing interest in companies central to the AI revolution.8 From December 2024 to August 2026, the S&P Korea BMI had a cumulative performance of 341.2%, with the main contributors to performance being Samsung (388.7%), from the Technology Hardware, Storage & Peripherals GICS® industry, and SK Hynix (862.7%), classified under the Semiconductors & Semiconductor Equipment GICS industry,. While the crowding-out effect of the semiconductors industry has remained modest at less than 1.0%, the impact has been more pronounced in the hardware industry, where the weight jumped from 2.8% to 8.8% when South Korea is included, largely due to Samsung’s dominant presence (see Exhibit 3). When South Korea was included in emerging market indices, Samsung and SK Hynix crowded out other industries.
Recent developments in the South Korean stock market and economy are consistent with S&P DJI’s developed market classification. Its inclusion in emerging market indices, however, has shown the potential to crowd out weights in less-developed countries and certain industries. S&P DJI offers indices that reflect a range of different perspectives, providing alternative lenses through which global equity markets can be viewed and measured.
1 River Akira Davis and Jason Karaian, “South Korea’s Already Shaky Markets Further Rattled by Political Turmoil,” The New York Times, Dec. 3, 2025.
2 John Welling, “Is South Korea Crowding Your Emerging Markets Allocation?” S&P Dow Jones Indices LLC, Nov. 23, 2020.
3 World Bank, GDP Growth, Republic of Korea.
4 “Foreign ownership of S. Korean stocks reaches highest in nearly 6 years,” The Korea Herald, Jan. 25, 2026.
5 Cynthia Kim, “South Korea starts 24-hour trading of dollar-won,” Reuters, July 5, 2026.
6 Ying-Shan Lee, “South Korea ends its longest short-selling ban after systemic reforms,” CNBC, March 30, 2025.
7 Heejin Kim and Jihoon Lee, “S. Korean President Lee vows more stock market reforms, triggering share rally,” Reuters, March 18, 2026.
8 Nick Didio, “Choppy Chips,” S&P Dow Jones Indices LLC, July 16, 2026.
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