KOSPI hits record 9,114 as chip stocks surge on US-Iran ceasefire talks
Synopsis
SK hynix overtook Samsung Electronics in market capitalisation for the first time as the KOSPI hit a record 9,114.55 — a milestone driven not just by chips but by a fragile US-Iran diplomatic road map with a 60-day clock. If the deal holds, South Korean defence and tech exports face a recalibrated geopolitical landscape.
Key Takeaways
KOSPI closed at a record 9,114.55 on 22 June , up 62.13 points or 0.69 percent .
SK hynix surged 5.61 percent to 2.92 million won , surpassing Samsung Electronics in market capitalisation for the first time.
US and Iran agreed on a 60-day road map for a final deal, brokered by Qatar and Pakistan .
Hyundai Motor fell 5.22 percent and Samsung Life Insurance slid 9.36 percent , among the session's biggest losers.
The Korean won weakened to 1,537 won per US dollar, down 10 won from the previous session.
South Korea's benchmark Korea Composite Stock Price Index (KOSPI) closed at an all-time high of 9,114.55 on Monday, 22 June, gaining 62.13 points or 0.69 percent, driven by a sharp rally in semiconductor stocks as US-Iran peace negotiations showed meaningful progress. The index touched an intraday peak of 9,253.00 before paring some gains by the close.
Key Developments
Trade volume was moderate, with 377.2 million shares worth 41.4 trillion won (approximately US$26.9 billion) changing hands. Losers outnumbered winners 739 to 148. Retail investors and domestic institutions were net buyers, absorbing 2.15 trillion won and 308.4 billion won respectively, while foreign investors were net sellers at 2.55 trillion won.
US-Iran Talks: The Catalyst
On Sunday, 21 June, Washington and Tehran concluded their first round of negotiations and agreed on a road map to reach a final deal within 60 days, according to a joint statement from mediating nations Qatar and Pakistan. The talks had earlier been on the verge of collapse after Iran announced the closure of the Strait of Hormuz and US President Donald Trump reiterated threats to resume military strikes on Iran.
Kang Jin-hyeok, an analyst at Shinhan Securities, noted: 'Negotiations went smoothly in general despite some aggressive messages, which were considered short-lived noises.'
Semiconductor Stocks Lead the Rally
Chip stocks were the standout performers of the session. SK hynix surged 5.61 percent to 2.92 million won, overtaking Samsung Electronics in market capitalisation for the first time — a historic milestone for the South Korean market. SK Square, the parent company of SK hynix, soared 10.67 percent to 1.97 million won. Hanmi Semiconductor, a leading chip equipment maker, rose 2.2 percent to 301,500 won.
Defence stocks also held up: Hanwha Aerospace gained 0.27 percent to 1.13 million won, and Korea Aerospace Industries (KAI) climbed 1.43 percent to 148,600 won.
Laggards: Samsung, Hyundai, LG
Samsung Electronics bucked the chip rally, slipping 0.14 percent to 353,500 won, while its affiliate Samsung Electro-Mechanics fell 1.85 percent to 2.23 million won. Broader losses were steeper elsewhere: Hyundai Motor dropped 5.22 percent to 581,000 won, and LG Energy Solution declined 4.7 percent to 385,500 won. Samsung Life Insurance was among the hardest hit, sliding 9.36 percent to 450,500 won, while Samsung Biologics retreated 5.75 percent to 1.3 million won.
Currency and Bond Markets
The Korean won weakened 10 won against the US dollar, settling at 1,537 won. Bond yields rose in tandem with equity optimism: the three-year Treasury yield added 2.6 basis points to 3.810 percent, and the five-year government bond yield climbed 3.9 basis points to 4.044 percent.
With a 60-day deadline now set for a US-Iran final agreement, markets will closely watch whether diplomatic momentum holds — and whether SK hynix can sustain its new position atop South Korea's market capitalisation rankings.
Point of View
But its foundation is uneven. SK hynix dethroning Samsung in market cap is a structural story about memory chip demand — but the broader index rally rests on a 60-day US-Iran diplomatic window that has already shown signs of fragility. Hyundai's 5.22 percent drop and Samsung Life's near 10 percent slide signal that not all of South Korea's economy benefits from a Middle East de-escalation; in fact, a ceasefire could erode the defence-sector tailwind that has quietly buoyed Korean aerospace stocks for months. The won's continued weakness adds a currency risk layer for foreign investors who may be tempted to take profits on the headline record.
NationPress
22 Jun 2026
Frequently Asked Questions
Why did the KOSPI hit an all-time high on 22 June?
The KOSPI surged to a record 9,114.55 primarily on the back of a semiconductor rally and optimism over US-Iran peace negotiations, which produced a 60-day road map for a final deal. Chip stocks, led by SK hynix, were the main drivers of the index gain.
How did SK hynix perform and why is it significant?
SK hynix jumped 5.61 percent to 2.92 million won, overtaking Samsung Electronics in market capitalisation for the first time. This marks a historic shift in South Korea's corporate pecking order, reflecting strong global demand for memory chips.
What is the US-Iran 60-day road map?
On 21 June, the US and Iran concluded their first round of talks and agreed on a road map to reach a final agreement within 60 days, according to a statement by mediators Qatar and Pakistan. The talks had been close to collapse after Iran closed the Strait of Hormuz and the US threatened to resume strikes.
Which stocks fell despite the KOSPI record?
Samsung Electronics slipped 0.14 percent, Hyundai Motor dropped 5.22 percent, LG Energy Solution fell 4.7 percent, Samsung Life Insurance slid 9.36 percent, and Samsung Biologics retreated 5.75 percent — all closing in negative territory even as the index hit a fresh peak.
What happened to the Korean won on 22 June?
The Korean won weakened against the US dollar, settling at 1,537 won — down 10 won from the previous session — as foreign investors were net sellers of South Korean equities worth 2.55 trillion won.
