Impact of Policy Proposals on South Korea's KOSPI Index and Major AI Companies

By Patricia Miller

May 13, 2026

2 min read

South Korea’s KOSPI index fell 2.3% amid tax proposals on AI profits, significantly affecting major companies like Samsung and SK Hynix.

South Korea’s KOSPI index faced a significant downturn as it closed approximately 2.3% lower, influenced by speculation surrounding a potential tax on profits from the artificial intelligence sector. At one point, the index plummeted over 5%, reaching a low of 7,421.71, before market buyers intervened to mitigate further losses.

The downturn was triggered by a suggestion from a policy advisor proposing that returns generated by the AI sector—anchored in South Korea’s industrial framework—should partially benefit the public through a proposed citizen dividend. Investors perceived this as a direct challenge to the nation’s most valuable corporations, leading to a sell-off across the market.

#How Are Major Companies Affected by Government Proposals?

Major players like Samsung Electronics and SK Hynix, which together comprise nearly half of the KOSPI’s market capitalization, were heavily impacted. The conversation around taxing AI profits places these two giants at the forefront of market reactions, intensifying concerns among traders who anticipated stringent measures against the companies pivotal to South Korea's semiconductor leadership.

As traders heightened their alertness to worst-case scenarios, both companies significantly contributed to the KOSPI’s decline. Samsung and SK Hynix are vital components of the global AI supply chain, with Samsung producing essential high-bandwidth memory chips needed for artificial intelligence training and SK Hynix serving as Nvidia’s primary supplier for these chips.

#What Clarifications Were Made to Alleviate Investor Concerns?

In the immediate aftermath of the initial panic, government officials attempted to clarify their stance. They indicated that any proposed citizen dividend would be funded by new tax revenues arising from growth within the AI sector, rather than directly extracting profits from corporate earnings. This differentiation is critical; a tax on excess profits has a punitive connotation compared to a revenue-sharing approach based on growth.

However, ambiguity still looms over the definition of “excess tax revenue,” leaving many investors uncertain. While some recovery occurred from the intraday low back to a closing loss of 2.3%, it is evident that not all investors were reassured by official statements, as the gap from the opening index suggests lingering caution.

#How Does This Situation Reflect Broader Market Risks?

This situation is especially notable given the recent optimism surrounding the KOSPI, with institutions like JPMorgan raising their targets for South Korean equities, indicating a growing confidence. However, that confidence quickly diminished, underscoring the reality that policy risks can swiftly overshadow fundamental growth, reminding investors that market dynamics can shift rapidly.

For international investors with stakes in major firms like Samsung or SK Hynix through ETFs or direct investments, this incident acts as a stress test. With both firms essential to the global AI infrastructure, understanding government intentions and potential policy shifts becomes increasingly vital for safeguarding and strategizing their investments.

Important Notice And Disclaimer

This article does not provide any financial advice and is not a recommendation to deal in any securities or product. Investments may fall in value and an investor may lose some or all of their investment. Past performance is not an indicator of future performance.