Nikkei drops 2.5% as chip stocks crater and bond yields hit multi-decade highs

The Nikkei 225 closed at 67,460.73 on August 19, losing roughly 2.54% after sliding from 69,220.25 in the prior session. That makes two consecutive days of declines for Japan’s benchmark equity index, with semiconductor stocks doing most of the damage and rising government bond yields twisting the knife.

The index peaked near 73,007 in June, which means it has shed more than 7% from its all-time high in just a couple of months.

Chip stocks are taking the biggest hit

The usual suspects are leading the sell-off. Advantest and Tokyo Electron, two of Japan’s most important semiconductor equipment makers, have seen their shares fall between 4% and 9% or more during recent weeks. Kioxia, the memory chipmaker, has also been caught in the downdraft.

South Korean chip giants Samsung and SK Hynix have faced similar pressure, and US tech sentiment has turned sour as investors question whether the enormous capital expenditure pouring into AI infrastructure will actually generate returns anytime soon.

The Nikkei suffered a nearly 4% single-day drop on July 28, driven by essentially the same fears. The pattern has repeated throughout July and August 2026, creating a stretch of volatility that has tested the patience of even committed long-term holders.

Rising bond yields are adding fuel to the fire

The 10-year JGB yield has pushed into a range between 2.775% and 2.95%, approaching 30-year highs. For context, Japanese bond yields spent most of the 2010s barely above zero, and even negative for extended stretches.

Rising yields make bonds more attractive relative to stocks, particularly growth and tech names whose valuations depend heavily on future earnings. When the risk-free rate climbs, the present value of those future cash flows shrinks. It’s the same math that punished US tech stocks when the Federal Reserve was hiking rates aggressively in 2022 and 2023, now playing out in Japan’s own backyard.

Japan’s public debt load, the largest among developed nations as a share of GDP, means even modest increases in borrowing costs have outsized implications for the government’s budget.

Global tech sentiment and what comes next

When Philadelphia Semiconductor Index constituents slide, Advantest and Tokyo Electron tend to follow within hours. South Korean chipmakers amplify the signal.

The Nikkei’s more than 7% decline from its June peak doesn’t yet qualify as a full-blown correction by the traditional 10% threshold, but the trajectory has been consistently downward. The next catalyst likely arrives with US tech earnings season.

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