Which countries are investing most actively in South Korea? The answer depends on how foreign direct investment (FDI) is measured. The country registering the largest number of foreign-invested companies is not necessarily the country committing the most investment capital.

To examine this distinction, KOISRA analyzed foreign-invested company registrations recorded by KOBDi (Korea Business Data Intelligence) and compared them with official investment statistics published by the Korea Trade-Investment Promotion Agency (KOTRA).

The analysis covers the five completed calendar years from 2021 through 2025. During this period, KOBDi recorded 7,463 companies with first FDI registration dates, while KOTRA reported US$163.28 billion in FDI notifications and US$90.40 billion in actual investment arrivals.

Comparing these indicators reveals important differences in the geographic profile of foreign investment in Korea.

Why Company Registrations and Investment Capital Tell Different Stories

Foreign investment in Korea can be evaluated through several indicators, each providing a different perspective.

FDI company registrations show how many companies are recorded as having obtained foreign-invested company registration. In the KOBDi dataset, the relevant date is the company's first recorded FDI registration date. This does not necessarily mean that the company was legally incorporated in the same year.

FDI notifications measure the amounts formally reported by foreign investors under Korea's investment reporting system. Notifications indicate planned or committed investment, rather than necessarily confirming that the entire amount has already entered Korea.

Actual investment arrivals measure capital received in Korea. The timing of these arrivals can differ from the year in which investment was initially reported.

These indicators are complementary, but they are not interchangeable. In particular, KOTRA's annual investment statistics include transactions involving both newly registered and previously established businesses. Consequently, dividing annual investment amounts by the number of new FDI registrations would not provide a reliable average investment per company.

1. Which Countries Registered the Most FDI Companies?

According to KOBDi, China was the leading investor origin by the number of companies first registered as foreign-invested businesses during 2021–2025.

Chinese investors accounted for 1,518 registrations, considerably ahead of the United States with 883. Vietnam followed with 594 registrations, narrowly ahead of Singapore with 568 and Hong Kong with 474.

China, the United States, Vietnam, Singapore, Hong Kong and Japan together accounted for approximately 59% of the registrations in the five-year dataset.

The presence of Vietnam, Kyrgyzstan, Mongolia and Pakistan among the leading countries is noteworthy. It suggests that foreign-invested company registration activity extends beyond the economies traditionally associated with large investment announcements.

However, registration counts alone cannot establish the size, employment, profitability or continuing operational activity of the companies involved.

2. How Did the Leading Countries Change Between 2021 and 2025?

The five-year figures also reveal changes in the composition of FDI registrations.

Source: KOBDi. Figures represent companies grouped by their first recorded FDI registration year.

Vietnam shows one of the most striking changes. Its registrations increased from 78 in 2022 to 231 in 2025, almost tripling over three years. By 2025, Vietnam ranked second behind China in annual registrations, ahead of the United States.

China also demonstrated sustained growth in registration activity, increasing from 197 companies in 2021 to 389 in 2025.

By comparison, US registrations reached their five-year peak of 232 in 2022 and subsequently remained relatively stable, between 157 and 169 annually.

These different trajectories illustrate how the composition of Korea's foreign-invested company registrations has evolved. Further company-level research would be required to establish whether the changes reflect particular industries, investment structures or business models.

3. Which Countries Invested the Most Capital?

The country ranking changes substantially when investment is measured by value instead of registered companies.

KOTRA's official notification-based statistics show that South Korea attracted approximately US$163.28 billion in reported FDI during 2021–2025.

The United States was the largest source jurisdiction, accounting for US$35.08 billion, or approximately 21.5% of the total.

The Cayman Islands ranked second with US$19.11 billion, followed by Singapore, Japan and China.

China, despite leading FDI company registrations by a considerable margin, ranked fifth by reported investment capital, with US$14.32 billion.

Conversely, the Cayman Islands, Netherlands and Malta occupied prominent positions in the capital ranking despite comparatively modest numbers of FDI registrations in KOBDi.

These differences demonstrate why the number of registered foreign-invested companies should not be treated as a substitute for investment-value statistics.

4. Comparing Registrations, Reported Investment and Actual Arrivals

The following comparison brings the three indicators together for selected major investor jurisdictions.

Sources: KOBDi and KOTRA. All figures are cumulative for 2021–2025. KOTRA's amounts cover national FDI reporting and arrivals during the period, not exclusively investment into the companies counted by KOBDi.

China: Broad Registration Activity

China accounted for approximately one in five FDI registrations in the KOBDi dataset. Its share of reported investment value was smaller, at approximately 8.8%.

This suggests that China's presence is particularly prominent when measured through company-registration activity. However, without matching individual investments to individual companies, the figures cannot establish the average size or economic performance of Chinese-invested businesses.

United States: Leading Capital Contributor

The United States ranked second in KOBDi registrations but first in both reported investment value and actual investment arrivals over the five-year period.

Its US$35.08 billion in notified FDI represented approximately 21.5% of Korea's total reported investment during 2021–2025. This reinforces the importance of distinguishing the value of investment transactions from the number of companies registered.

Vietnam: A Growing Registration Footprint

Vietnam's 594 FDI registrations placed it third in the KOBDi ranking. Yet KOTRA recorded approximately US$112 million in investment notifications attributable to Vietnam over the same five years.

This is one of the clearest differences between the two indicators. The registration trend points to increasing participation by Vietnamese investors in Korea's foreign-invested business population, but it does not, by itself, establish the economic scale or activity of those companies.

Cayman Islands and Malta: The Importance of Investor Jurisdiction

The Cayman Islands accounted for 88 KOBDi registrations while ranking second by reported investment value. Malta recorded only 19 registrations but approximately US$8.64 billion in reported FDI.

Such differences require careful interpretation. International investment can be structured through holding companies, investment vehicles and intermediate jurisdictions. Consequently, the country appearing in an investment record does not necessarily identify the country of the ultimate owner or controlling investor.

The OECD distinguishes between the immediate investing economy and the ultimate investing economy for precisely this reason. Country-level investment statistics should therefore be interpreted as evidence of recorded cross-border investment links, not necessarily the final origin of all underlying capital.

5. Five-Year Trend: More FDI Registrations and Rising Reported Investment

Both KOBDi registrations and reported FDI capital increased between 2021 and 2025, although they represent different measures.

KOBDi registrations rose from 1,119 in 2021 to 1,703 in 2025, an increase of approximately 52.2%.

Over the same period, officially reported investment increased from US$29.51 billion to US$36.05 billion, or approximately 22.1%. The 2025 figure represented a record annual level of reported FDI in South Korea.

Actual capital arrivals followed a less consistent trajectory. According to KOTRA's country-level arrivals dataset, annual arrivals totaled approximately US$17.99 billion in 2021, US$19.98 billion in 2023 and US$18.74 billion in 2025.

This illustrates another important distinction: a rise in reported investment commitments does not necessarily produce an equivalent increase in capital arrivals during the same calendar year.

6. What Do These Findings Mean for Foreign Investors?

For businesses evaluating the South Korean market, the findings suggest that country-level FDI activity should be interpreted through more than one indicator.

Company-registration data can help identify the breadth and changing geographic composition of foreign-invested businesses. A rising registration count may warrant further research into market-entry patterns, business models and investor communities.

Investment-value data offers a different perspective, showing where substantial capital commitments are being reported. Such investments may involve expansion projects, acquisitions, capital injections or other transactions that do not necessarily result in new company registrations.

Actual capital-arrival data adds another dimension by documenting investment received during the reporting period.

Nevertheless, none of these indicators independently establishes whether newly registered companies remain active, how many employees they hire or whether their Korean operations are commercially successful. Those questions require separate company-level and employment analysis.

For an individual foreign investor, the appropriate legal structure also depends on the intended commercial activities and ownership arrangements. Establishing a Korean corporation with FDI registration, operating through a branch, or maintaining a liaison office involves different legal and administrative requirements. An overview of business and company registration options in South Korea provides additional context on these distinctions.

Conclusion: Understanding Both the Breadth and Value of FDI

South Korea's foreign investment landscape becomes more informative when company registrations and investment capital are analyzed together.

China leads by the number of companies entering KOBDi's FDI registration dataset, while the United States leads by reported investment value. Vietnam's growing registration footprint contrasts with its relatively modest reported capital amounts, while jurisdictions such as the Cayman Islands and Malta occupy prominent positions in investment-value statistics despite far fewer registrations.

These differences are not contradictions. They demonstrate that foreign investment encompasses different forms of market participation and capital movement.

For policymakers, investors and businesses studying the Korean market, FDI registrations, reported capital and actual arrivals provide complementary perspectives. Understanding how these indicators differ is essential to interpreting the scale, structure and direction of foreign investment in South Korea.

Sources and Research Methodology

1. KOBDi (Korea Business Data Intelligence): https://kobdi.co.kr/. FDI company-registration statistics grouped by country of foreign-investor origin and first recorded FDI registration year. Research retrieved October 19, 2026.
2. KOTRA – Country-Level FDI Statistics (Notification Basis): Official public dataset, country-level investment amounts through December 31, 2025.
3. KOTRA – Country-Level FDI Statistics (Arrival Basis): Official public dataset, country-level investment arrivals through December 31, 2025.
4. OECD – Benchmark Definition of Foreign Direct Investment, Fifth Edition: Geographic attribution and immediate versus ultimate investing economies.
5. Ministry of Trade, Industry and Resources: 2025 annual FDI results.

Methodological notes: This analysis uses five completed calendar years, January 1, 2021 through December 31, 2025. KOBDi registration counts are based on records available at the retrieval date and should not be interpreted as a complete census of all operating foreign-owned businesses. FDI registration dates do not necessarily correspond to initial corporate incorporation dates. KOTRA's reported and arrived investment amounts are national annual statistics and are not restricted to the companies included in the KOBDi registration cohort. Country classifications represent recorded investor jurisdictions and may differ from ultimate ownership locations. Investment amounts are stated in nominal US dollars. Dataset revisions may result in differences from previously published provisional statistics.