AI Optimism Soars: SK Hynix and Samsung Shares Rocket Over 20% as Tech Rally Ignites

In a powerful resurgence for the artificial intelligence (AI) rally, South Korea's leading chip manufacturers, SK Hynix and Samsung Electronics, saw their shares skyrocket in Seoul on Friday. This dramatic surge, fueled by blockbuster earnings reports from U.S. tech giants Amazon and Microsoft, has reignited investor optimism around significant AI infrastructure spending.

SK Hynix closed with an astonishing gain of nearly 30%, marking its strongest single-day performance on record. Not to be outdone, Samsung Electronics also achieved its highest single-day gains, closing up nearly 27%. The wave of positive sentiment extended to other South Korean tech firms, with LG Innotek advancing 21.23% and Seoul Semiconductor rising 15%.

The AI-driven rally was not confined to South Korea. Japanese chip stocks also experienced a sharp upward trend. Key players like Advantest climbed over 16%, while Tokyo Electron gained 6.24%. Disco and Lasertec both saw impressive increases of 12.74%, and Renesas Electronics added 7.7%. Even SoftBank Group, a crucial proxy for AI investment through its ownership of Arm, jumped a significant 13.8%.

Taiwan's semiconductor titan, TSMC, also participated in the broad rally, surging almost 10%.

This widespread rally in Asian chip stocks marks a significant turnaround after a challenging week that saw semiconductor shares battered by concerns over lofty AI valuations and increasing competition from Chinese memory chipmakers. The positive shift was largely anticipated after the iShares Semiconductor ETF (SOXX) surged more than 8% overnight, as investors flocked back to AI-linked chipmakers following stronger-than-expected cloud results.

Amazon's impressive second-quarter revenue beat analysts' expectations, primarily driven by the sustained strength of its cloud-computing business. Meanwhile, Microsoft had already rallied 16% in Thursday's session, reporting faster-than-expected growth in its Azure cloud platform, which strongly reinforced confidence in the continued robustness of AI infrastructure spending.

Commenting on the market's response, Andrew Jackson, head of equity strategy at Ortus Advisors, noted that Microsoft's stellar quarterly results "sparked a huge rebound for risk-on and AI," effectively reversing the recent slump in technology stocks. He highlighted that investors were particularly reassured by Azure cloud revenue surpassing expectations, coupled with management's judicious approach to capital spending, indicating that the market is wary of a "'spend at all costs' mentality."