[Analysis] US-Iran Ceasefire Negotiation Expectations and KOSPI's 2% Rise

Easing Geopolitical Tensions and KOSPI's Rally

On May 29, 2026, the domestic stock market staged a strong rebound as expectations for ceasefire negotiations between the US and Iran—a major risk factor in global financial markets—intensified. With investor sentiment rapidly improving, the KOSPI index recorded an upward trend of over 2% compared to the previous trading day. This reflects a typical pattern where suppressed preference for risk assets revives, and the alleviation of geopolitical risks enhances the overall investment attractiveness of emerging market assets. Inflows from foreign and institutional investors primarily drove the index gains, largely centered on large-cap stocks.

Key Details of the US-Iran Tentative Agreement

According to recent reports from major domestic media (such as Etoday and Chosun Ilbo on May 29, 2026), working-level officials from both nations have reportedly reached a tentative agreement on a Memorandum of Understanding (MOU) centered on a 60-day ceasefire extension. The main points of the negotiation include:

• Prevention of Military Conflict: Restraining localized escalation and suspending additional military actions through a 60-day conditional ceasefire extension.
• Mitigation of Logistics Risks: Pushing for the lifting of shipping restrictions for civilian vessels in key global oil transit routes like the Strait of Hormuz.
• Laying Groundwork for Nuclear Talks: Restoring limited dialogue channels regarding Iran's nuclear program and seeking diplomatic solutions.

In particular, the concrete prospect of easing tensions in the Strait of Hormuz—a critical chokepoint for crude oil transport—has significantly heightened market expectations for the stabilization of international oil prices and the slowdown of global inflationary pressures. This served as a highly powerful and positive catalyst for South Korea's stock market and economy, which is heavily reliant on energy imports and export-driven growth.

Lingering Uncertainties: Final Approval and Outlook

However, there are still factors of uncertainty that warrant caution against relying entirely on optimism. Despite meaningful tentative agreements at the working level, the final approval process by the US President remains pending, making it difficult to consider it a finalized deal. Furthermore, differing opinions regarding the agreement are still being reconciled between hardliners and moderates within Iran, leaving ample room for sudden dissonance over last-minute power struggles and detailed provisions (such as enriched uranium processing methods and the extent of economic sanction relief).

In conclusion, the KOSPI's 2% surge driven by these "ceasefire negotiation expectations" clearly demonstrates the strong resilience of the domestic stock market, which had been weighed down by geopolitical headwinds. While positive index movements linked to news of negotiation progress are expected in the short term, investors should meticulously monitor whether a final agreement is reached, track global commodity price trends, and manage risks by observing subsequent changes in the won-dollar exchange rate and foreign institutional supply and demand.