Samsung and SK Hynix Shares Rally as Kospi Posts Biggest Daily Gain Since February

TLDR

The Kospi rose 3.09% to close at 5,638.34, its biggest daily gain since February. Samsung Electronics gained 4.23% and SK Hynix rose 5.18% after Anthropic’s IPO filing lifted AI sentiment. Both chipmakers reportedly target Q2 2027 shipments of eight-layer HBM4 chips to Nvidia. SK Hynix is reportedly weighing a special dividend of about 16 trillion won but has made no decision. SK Hynix reports Q3 results on October 28, followed by Samsung on October 29.

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South Korean stocks rallied on Tuesday as renewed interest in artificial intelligence lifted investor mood. Samsung Electronics and SK Hynix led the gains.

The Kospi rose 168.87 points, or 3.09%, to close at 5,638.34. Intraday, it was up as much as 3.4%, its biggest daily gain since February.

KOSPI Composite Index (^KS11)

The rise follows a hard October. The index was on track for a monthly drop of around 17%.

Samsung and SK Hynix together make up nearly half of the Kospi’s market value. That makes their moves important for the wider Korean market.

Samsung Electronics closed up 4.23% at 222,000 won. SK Hynix gained 5.18% to 1.34 million won.

Other chip-linked shares also rose. SK Square, the parent of SK Hynix, jumped 7.67%, while Samsung Electro-Mechanics gained 7.42%.

Anthropic IPO Filing Revives AI Interest

The main trigger was Anthropic’s public IPO filing, released Monday before the US market opened. The filing showed strong revenue growth at the company behind the Claude AI models.

US tech stocks moved higher. The Nasdaq Composite rose about 1% and the Philadelphia Semiconductor Index gained close to 3%.

Concerns over AI financing and returns had driven a recent sell-off. The filing gave investors a closer look at the sector’s finances.

Foreign investors bought a net 592.97 billion won in shares. Institutions added 280.38 billion won, while individuals sold a net 947.78 billion won.

Falling oil prices also helped. Reports of Qatari mediation between Iran and the United States raised hopes of easing Middle East tensions.

The Korea Exchange triggered a buy-side sidecar at 10:13 a.m., pausing program buy orders for five minutes. It was the first such action in four sessions.

HBM4 Plans and SK Hynix Dividend Report

Korean media reported that both chipmakers aim to start mass production and shipments of eight-layer HBM4 chips for Nvidia in the second quarter of 2027.

A report also said SK Hynix is considering a special dividend of about 16 trillion won. It could be funded by gains from its stake in Kioxia.

SK Hynix said it is reviewing shareholder-return options and has made no decision. It plans to give an update with Wednesday’s earnings.

The company also recently halted plans for a US listing of its Solidigm unit, citing market conditions.

SK Hynix reports third-quarter results on October 28. Samsung Electronics follows on October 29.

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