South Korea’s stock market just delivered one of its biggest moments of 2026. On May 4, the KOSPI surged 5.12% to close at a record 6,936.99, putting the benchmark index within striking distance of the symbolic 7,000 mark. The rally was led by the country’s two semiconductor heavyweights: Samsung Electronics and SK hynix.

Samsung Electronics closed at 232,500 won, up 5.44%, while SK hynix jumped 12.52% to 1,447,000 won, a record high.

Why the Rally Happened

The biggest driver was AI. SK hynix rallied after major U.S. tech companies signaled stronger spending on AI data centers, boosting expectations for high-bandwidth memory and other advanced chips used in AI servers. Reuters reported that foreign buying helped push SK hynix shares sharply higher on the day.

Samsung Electronics also benefited from the broader semiconductor surge, though SK hynix outperformed because of its stronger association with AI memory demand. Together, the two companies helped pull the entire Korean market higher.

What the Stock Milestones Mean

Korean retail investors often turn major stock prices into shorthand nicknames. In this rally, the key milestones were simple: Samsung Electronics moved into the 230,000-won range, while SK hynix moved into the 1.44-million-won range.

For international readers, these phrases work like milestone labels such as “Bitcoin at $100K” or “Tesla at $1,000.” They are not just prices; they become emotional markers for investors watching a rally unfold in real time.

Why AI Chips Matter to Korea

South Korea is one of the world’s most important memory-chip producers. Samsung Electronics and SK hynix are central players in the global supply chain for DRAM, NAND, and high-bandwidth memory, all of which are increasingly important as AI data centers expand.

Analysts have pointed to strong demand for AI-related memory as a major reason Korea’s semiconductor stocks have become market leaders again. Korea JoongAng Daily previously reported that Samsung Electronics and SK hynix were expected to post nearly 70 trillion won in combined first-quarter operating profit, reflecting the scale of the current memory-chip cycle.

Is KOSPI 7,000 Next?

The KOSPI is now close enough to 7,000 for the milestone to feel realistic. Still, the rally remains highly dependent on semiconductor earnings, foreign investor flows, AI infrastructure spending, and global market sentiment.

That makes the moment exciting but also risky. A market led by a small number of giant chip stocks can move quickly in both directions.

Bottom Line

The KOSPI’s record close near 7,000 shows how strongly South Korea’s market is tied to the global AI boom. Samsung Electronics and SK hynix are no longer just domestic blue-chip stocks; they are major beneficiaries of the AI infrastructure race.

For Korea watchers, this is more than a finance story. It is a clear sign that AI chips are shaping not only global technology, but also South Korea’s market mood, investor language, and economic outlook.

This article is for news and cultural explanation only and is not financial advice.