Oil nears $110, yields near 5%: can KOSPI and Nikkei avoid a deeper rout?

South Korea’s KOSPI and Japan’s Nikkei 225 led a broad Asian selloff on Friday as oil surged above $108 a barrel and US bond yields moved dangerously close to 5%, reviving concerns that inflation could force central banks to tighten further.

The KOSPI dropped more than 2.5%, extending Thursday’s weakness, while the Nikkei 225 tumbled about 2.8%.

Hong Kong’s Hang Seng lost 1.5%, China’s CSI 300 fell 1.2% and MSCI’s broad Asia-Pacific index outside Japan declined 1.8%.

The moves followed another retreat on Wall Street after hotter US producer-price data intensified rate concerns.

KOSPI feels the squeeze from oil and higher yields

The selloff is particularly uncomfortable for South Korea because the market combines heavy technology exposure with an economy highly sensitive to imported energy costs.

Brent traded around $108 after reaching almost $110 earlier in the session, following fresh disruption around the Red Sea and Strait of Hormuz.

That raises costs for manufacturers while simultaneously pushing global bond yields higher.

The KOSPI was already showing signs of strain on Thursday, when foreign investors sold a net 2.72 trillion won of shares even as the index managed to finish just above 7,000. Samsung Electronics and SK Hynix both ended lower.

That makes Friday’s decline more than a simple regional risk-off move.

Korean technology valuations benefited heavily from the AI and memory-chip rally, leaving them particularly exposed when the discount rate applied to future earnings rises.

Nikkei hit by chips as BOJ tightening moves closer

Japan’s market faced an additional problem: domestic monetary policy.

The Nikkei fell 2.8%, with chip-related names among the biggest losers. Kioxia Holdings, SoftBank Group and Advantest dropped roughly 5% to 6%.

At the same time, markets are increasingly convinced the Bank of Japan will raise rates again next week.

That leaves Japanese equities squeezed between higher global yields and expectations for tighter domestic policy.

The yen traded around 154.4 per dollar, while Japanese government-bond yields also climbed.

TD Securities analysts told The Wall Street Journal that the yen’s next move will depend heavily on how strongly the BOJ signals further tightening after September.

A more hawkish path would add another challenge for exporters.

Hot US PPI turns oil into a global rates problem

The deeper issue for both the KOSPI and Nikkei is that the oil shock is now feeding directly into the interest-rate debate.

US producer prices rose 0.4% in August and 5.4% from a year earlier.

Energy prices were the biggest driver of the monthly goods increase, while diesel prices jumped 24.1%, according to the Bureau of Labor Statistics.

That sent the 10-year Treasury yield towards 4.97% and the 30-year yield to around 5.38%, its highest in almost two decades.

Markets now place roughly a 70% probability on a Fed increase next week.

JPMorgan Asset Management strategist Tai Hui told the Financial Times that the widening Middle East conflict risks raising global energy costs further as pressure builds around major shipping routes.

Friday’s US CPI report is therefore the next test. A hotter number would reinforce the worst combination for equities: expensive oil, higher yields and less room for central banks to wait.