KOSPI

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The Korea Composite Stock Price Index (KOSPI; Template:Lang-ko or Template:Lang-ko) is the primary stock market index of South Korea. It tracks the performance of all common stocks listed on the Stock Market Division (formerly the Korea Stock Exchange) of the Korea Exchange (KRX). It is a market-capitalization-weighted index and serves as the main benchmark for the South Korean equity market, analogous to the S&P 500 in the United States.

Overview

KOSPI was introduced in 1983 with a base value of 100 as of 4 January 1980. It is calculated using the market capitalization of constituent stocks relative to the base date. The index includes virtually all common shares listed on the KRX’s main board (KOSPI Market) and is published in real time. Daily trading volumes have historically reached hundreds of millions of shares, valued in the trillions of won.

As of the mid-2020s the index typically comprised 900 or more constituents. It is heavily influenced by large-capitalization companies in semiconductors, automobiles, batteries, shipbuilding, and related industries.

History

Predecessor indices existed earlier (including a Dow-style average from the 1960s), but the modern capitalization-weighted KOSPI began calculation in 1983. It replaced earlier composite measures and has been the flagship indicator of the Korean equity market since.

Key milestones include:

First crossing 1,000 points in the late 1980s.
Sharp declines and recoveries during the 1997 Asian financial crisis (including a record single-day percentage gain of 8.50% in June 1998).
Periods of relatively limited range (“Park-spi” periods) followed by breakthroughs above 2,000 and later 3,000.
Significant volatility during the COVID-19 pandemic starting in early 2020.
A major multi-year rally in 2025–2026 driven largely by demand for semiconductors linked to artificial intelligence, with the index reaching successive records including levels above 5,000, 6,000, and briefly over 9,000 in mid-2026 before experiencing sharp corrections and large single-day moves (including a record percentage gain near 18% in late July 2026).

Market capitalization of KOSPI-listed companies expanded substantially during the 2025–2026 rally, at times ranking among the larger equity markets globally by value.

Calculation and methodology

KOSPI is a free-float adjusted (in modern form) market-capitalization-weighted index. The formula compares the current aggregate market capitalization of constituents to the base-period capitalization, scaled to a starting value of 100 on 4 January 1980. Adjustments are made for corporate actions such as stock splits, rights issues, and listings/delistings. The index is reviewed periodically, and the KRX also publishes related indices including the KOSPI 200 (the 200 largest and most liquid stocks, widely used for futures and options), KOSPI 100, KOSPI 50, sector indices, and size-based indices.

Components

The index is dominated by a relatively small number of large companies. As of recent data in 2025–2026, major constituents by market capitalization have typically included:

Samsung Electronics
SK Hynix
Samsung Biologics
LG Energy Solution
Hyundai Motor Company
Celltrion
Kia
Naver Corporation
KB Financial Group
Hanwha Aerospace

Semiconductor-related stocks have frequently accounted for a substantial share of the index’s weight and performance, especially during periods of strong AI-related demand.

Related markets and indices

The Korea Exchange also operates the KOSDAQ market (focused more on growth and technology companies) and the KONEX market (for smaller and early-stage firms). The KOSPI 200 is the most important derivative-linked index and underlies futures, options, and exchange-traded funds.

Significance

KOSPI is the principal real-time indicator of South Korean equity market performance and a key reference for domestic and international investors. Movements in the index are closely watched for signals about the health of major Korean export industries, particularly semiconductors, automobiles, and related sectors, as well as broader investor sentiment toward the Korean economy and the so-called “Korea discount.”

References

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External links

Korea Exchange (official site)
Official KOSPI data and related indices via KRX