Asia stocks rout deepens as KOSPI slides 6% on oil, tariff shock

Asia-Pacific equities suffered their worst session in months as a trifecta of oil-driven inflation, new US tariffs, and revived rate-hike bets triggered a coordinated selloff.

South Korea's KOSPI slumped 6.1% to 6,665 points, leading a broad Asia selloff after Brent crude topped $100 a barrel and the US imposed fresh tariffs on 60 nations.

"Markets are pricing in a stagflation scenario that few portfolios are positioned for — higher oil, higher tariffs, and a Fed that may need to hike again," said Chetan Seth, Asia equity strategist at Nomura.

The selloff swept across the region. Japan's Nikkei 225 closed at 64,377, down 3.1%, while Taiwan's benchmark extended its decline to 1,119 points, or 2.5%, to 43,730. Hong Kong's Hang Seng Index fell 1.4% to 24,860 on turnover of HKD 100 billion, and China's Shanghai Composite lost 1.2% to 3,830. Australia's S&P/ASX 200 shed 1% to 8,755.

The rout erased roughly $1.5 trillion in market value across Asia, with technology stocks bearing the brunt as investors repriced the risk of higher-for-longer interest rates. The next flashpoint comes Sept. 17, when the Federal Reserve delivers its next rate decision — a meeting the CME FedWatch tool now assigns an 80% probability of a hike, up from 68% just two days earlier.

Technology stocks were the epicenter of the selloff. Samsung Electronics and SK Hynix each fell more than 7% in Seoul, dragging the KOSPI to its lowest level since March. The Korea Exchange temporarily suspended program sell quotations in KOSPI200 futures for five minutes as volatility triggered circuit breakers. South Korea's Financial Services Commission said it would accelerate a planned increase in minimum cash margin requirements for domestic leveraged exchange-traded funds to July 31, a move that could amplify further deleveraging.

The catalyst chain began in the Middle East, where attacks on two Saudi oil tankers in the Red Sea pushed Brent crude to as high as $102 a barrel, its highest since May. The benchmark settled at $100.69, up 7%, before easing to $100.40 in Asian trading. US crude slipped 0.5% to $91.71. The oil spike revived inflation fears just as the Trump administration imposed new tariffs of 10% to 12.5% on imports from 60 trading partners, covering 99% of US imports. The dollar surged to a 40-year high against the yen at 163.83, compounding pressure on Japanese equities.

Hong Kong-listed leveraged ETFs tracking tech indexes suffered outsized losses. The XL2CSOPHYNIX fund fell 12.9% to HKD 52.70, while the XL2CSOPSMSN fund dropped 15.4% to HKD 80.34, reflecting extreme bearish positioning in the technology sector. The selloff followed a turbulent session on Wall Street, where the S&P 500 fell 1.2%, the Dow Jones Industrial Average lost 506 points, and the Nasdaq Composite sank 2.2%. Tesla tumbled 14.5% after a weaker-than-expected quarterly profit, while Alphabet slid 7.1% as investors focused on rising capital spending for artificial intelligence rather than a revenue beat.

The combination of higher energy costs, escalating trade barriers, and the prospect of tighter monetary policy creates a stagflationary headwind that equity strategists say could persist through the third quarter. The European Central Bank held rates steady at its meeting Thursday, signaling limited appetite for easing even as growth slows. For Asian markets, the immediate risk is a further unwind of leveraged positions in South Korea and continued foreign outflows from Taiwan and Japan, where the yen's weakness has already drawn intervention warnings from Tokyo.

This article is for informational purposes only and does not constitute investment advice.