Japan and South Korea Stocks Rebound as Semiconductor Shares Lead Gains
Commodities 2026-10-21 08:04 source ↗

Japan and South Korea Stocks Rebound as Semiconductor Shares Lead Gains

Written by Julian Parker

Date: October 20, 2026

Key Takeaways

  • South Korea’s KOSPI opened 2.05% higher on October 21, while Japan’s Nikkei 225 advanced 1.41% in early trading.
  • Major semiconductor companies like Samsung Electronics, SK Hynix, Kioxia, and SoftBank Group saw significant gains as investors returned to technology shares.
  • Stronger preliminary figures from Supermicro indicated robust AI demand, although mixed performance in U.S. technology stocks highlighted ongoing earnings risks.

Asian Stocks Recover

On October 21, Japanese and South Korean stocks experienced a rebound, primarily driven by semiconductor leaders. The KOSPI index in South Korea opened at 5,666.34, reflecting a 2.05% increase, while Japan’s Nikkei 225 opened at 64,885.95, marking a 1.26% rise. By mid-morning, the KOSPI surged to 5,753.55, indicating a 3.62% increase, showcasing a strong intraday recovery.

Leading Companies in the Rebound

South Korean memory manufacturers were significant beneficiaries of this recovery. Samsung Electronics saw an initial gain of 2.72%, which extended to approximately 6% later in the morning. Similarly, SK Hynix rose by 3.92% initially and reached about 7% by 9:30 a.m. In Japan, Kioxia and SoftBank Group also recorded gains of 5.18% and 3.56%, respectively.

The performance of these companies highlighted the importance of sector breadth, as a broader rally across multiple firms would indicate stronger sentiment than a concentration of gains in a few large names.

Supermicro's Positive Update

Super Micro Computer provided a preliminary revenue estimate of $18.5 billion to $19.5 billion for its fiscal first quarter, significantly above previous guidance. This increase was attributed to heightened demand for AI platforms, with gross margins also expected to improve. This update bolstered sentiment towards the AI infrastructure supply chain, although it remains preliminary and subject to change.

Diverging Earnings Reactions

In the U.S. extended-hours trading, SpaceX shares rose over 8% following strong quarterly results, while Supermicro also saw a sharp increase. Conversely, Netflix's shares fell nearly 6% despite beating earnings expectations, primarily due to a lowered advertising revenue outlook. This divergence illustrates that an earnings beat does not guarantee positive market reactions, as investors also consider future growth potential and guidance.

Wall Street's Mixed Close

The Asian market rebound followed a mixed session in the U.S., where the Dow Jones Industrial Average gained 1.02%, while the Nasdaq Composite slipped slightly. The mixed performance of U.S. technology stocks during regular trading raised questions about the sustainability of the Asian gains, as the overnight session provided some support but did not indicate a uniform recovery.

Future Outlook

Attention now shifts to upcoming corporate results from major companies like Tesla and Meta Platforms, which will provide insights into spending and growth expectations. For semiconductor investors, the key issue remains whether AI infrastructure investments can yield sustainable revenue and earnings across the supply chain. The breadth of the Asian market rebound will also be crucial; continued gains beyond a few major players will strengthen the recovery.

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Informational only. Not investment advice.
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