South Korea's KOSPI index extended its rally to 17% as technology shares continued their broad-based surge, with semiconductor heavyweights SK Hynix Inc. and Samsung Electronics Co. leading the charge. The market's momentum reflects strong investor sentiment toward AI-linked chipmakers, buoyed by robust earnings reports from major U.S. technology firms. The rally underscores the growing correlation between global semiconductor demand and regional equity performance.

SK Hynix shares climbed 22.39% to 1.618 million Korean won (about $1,130) in Seoul, while Samsung Electronics rose 18.84% to 246,000 won (about $171). In parallel, SK Hynix's U.S.-listed American depositary receipt (ADR) gained 17.52% to $149 during regular trading hours and added another 3.29% in after-hours trading to reach $153.90. The iShares Semiconductor ETF (SOXX) also reflected this sector strength, climbing more than 8% during the regular session and gaining an additional 2.87% in extended trading.

Global Market Reactions

Asian markets broadly trended higher alongside South Korea's gains, with Japan's Nikkei 225 climbing 4.70% to 64,774.37. In the United States, Dow futures rose 151.00 points, or 0.29%, to 52,531.00. S&P 500 futures gained 23.75 points, or 0.32%, to 7,496.25, while Nasdaq 100 futures advanced 255.50 points, or 0.90%, to 28,493.25 as of around 8:32 p.m. EDT. The U.S. dollar index stood at 100.138, up 0.17% on the day.

In commodities, WTI crude oil rose 0.55% to $84.05 per barrel, and Brent crude gained 0.74% to $89.69 per barrel. Natural gas futures remained unchanged at $2.758 per MMBtu. These price movements occurred against a backdrop of heightened geopolitical risk in the Middle East.

Key Market Movers

Geopolitical Risks and Energy Supply

Concerns over energy security intensified following a drone attack near Egypt's Port of Damietta. No group has claimed responsibility for the incident, but it has raised fears regarding the safety of the Suez Canal and Egypt's Sumed pipeline. These routes have become increasingly critical for Saudi oil exports as conflicts disrupt shipping through the Strait of Hormuz and Bab el-Mandeb. Analysts note that while the market has not yet fully priced in a potential Suez Canal disruption, any such event could raise war-risk insurance costs and increase shipping expenses.

Iranian Foreign Minister Abbas Araghchi stated on X that Egypt is an important regional partner and that its security is a priority for Tehran. He warned against "Israeli plots and false-flag operations designed to undermine regional peace."

Earnings-Driven Tech Rally

The equity rally was further fueled by better-than-expected earnings from major U.S. technology companies. Amazon.com, Inc. surged 9.55% in extended trading after reporting strong second-quarter revenue. Microsoft Corp. led the regular session with a 15.51% jump following reports of stronger-than-expected Azure cloud growth. Conversely, Apple Inc.'s stock fell 6.33% despite beating fiscal third-quarter revenue expectations, as weaker services revenue disappointed investors.

The disproportionate rise in semiconductor stocks compared to broader market indices highlights a concentrated investor bet on artificial intelligence infrastructure. The specific double-digit gains in SK Hynix and Samsung suggest that capital is flowing aggressively into memory chip manufacturers, likely anticipating sustained demand from data center expansions. This sector-specific intensity contrasts with the more modest gains in traditional industrial and consumer sectors, indicating a market structure increasingly dependent on tech earnings performance.

South Korean regulators have tripled the cash deposit required to trade leveraged single-stock funds tied to Samsung Electronics Co. and SK Hynix Inc. to curb extreme market volatility. The intervention follows a 21.7% four-week decline in the iShares MSCI South Korea ETF, the steepest drop since March 2020. The new rules require investors to hold 30 million won in cash to trade these products, a significant increase from the previous 10 million won requirement.

Regulatory Changes

The Ministry of Finance and Economy, the Financial Services Commission, the Financial Supervisory Service, and the Bank of Korea jointly announced the tighter rules on Thursday. Previously, investors could cover up to 70% of the deposit requirement with stocks or bonds. The new mandate stipulates that the entire 30 million won must be held in cash. Additionally, regulators have halted new listings of these products until market conditions stabilize, banned advertising for existing funds, and raised the minimum order size to 20 shares from one.

Market Impact

The rapid expansion of single-stock leveraged ETFs has contributed to recent market turbulence. Assets under management for these funds surged from 4.4 trillion won on May 27 to over 15 trillion won within a month. Daily turnover has exceeded 18 trillion won. FSS Governor Lee Chan-jin noted that roughly 92% of the capital in these products is from retail investors. Margin loan balances across Korean brokerages have also risen to 36.3 trillion won from 20.9 trillion won a year ago.

SK Hynix Volatility

The regulatory action coincides with violent price swings in SK Hynix Inc., which listed American depositary receipts on the Nasdaq on July 10. The listing raised $26.5 billion, marking the largest U.S. listing ever by a foreign company. Since then, the stock has experienced significant whipsaw: falling 9% on a Monday, rebounding 27.3% on Tuesday, dropping 9% again on Wednesday, and sliding 7.6% in Thursday's pre-market session.