Global stocks slide as AI selloff sends investors running to bonds

The AI trade had a rough couple of days. Global stocks fell sharply on October 14 and 15, 2026, as investors dumped AI-related shares and piled into government bonds.

The trigger was a growing worry about how much debt is being used to build AI infrastructure. Add a hotter-than-expected US inflation print, and markets had two reasons to get nervous at once.

The damage, by the numbers

The Nasdaq Composite fell 1.9% on October 14. That was its biggest single-day drop since July 2026.

The broader S&P 500 lost 1.1% the same day.

Chipmakers took the worst of it. The Philadelphia SE Semiconductor Index, the main benchmark for semiconductor stocks, fell 4.3% as it logged a sixth straight losing session.

CoreWeave became the poster child for the anxiety. The company rents out AI computing capacity, and its shares fell as much as 15-16% on October 14.

The pain carried into the next morning. CoreWeave dropped roughly another 6% in premarket trading on October 15.

Asia had it worse. South Korea’s KOSPI sank approximately 8% on October 15, its seventh decline in a row.

The index’s two heavyweights, Samsung Electronics and SK Hynix, fell roughly 9% to 11% during the selloff.

Japan wasn’t spared either. The Nikkei 225 fell around 5% as the regional slide spread.

Debt, inflation and a bond market that broke the usual pattern

The first force is debt. Building data centers and buying stacks of advanced chips costs a fortune, and much of it is being financed with borrowed money.

The second is inflation. US price data came in hotter than expected and revived talk that the Federal Reserve could raise interest rates again.

Normally, hot inflation would push bond yields higher. This time they fell.

The benchmark 10-year US Treasury yield dropped about 8-10 basis points, landing around 5.09-5.105%, its lowest level in three weeks. Bond yields move opposite to prices, so falling yields mean investors were buying bonds aggressively.

Growth stocks lagged even as yields declined. Falling yields tend to help richly valued tech shares, but not this week.

What this means for investors

The most concrete signal came from BlackRock Investment Institute. The research arm of the world’s largest asset manager cut its view on US stocks to neutral from overweight, citing AI-driven volatility.

It also said it favors short-dated Treasuries. Shorter maturities carry less exposure to rate swings, which makes sense if the Fed might still hike.

Companies with heavy borrowing and big AI ambitions look most exposed. CoreWeave’s slide shows that investors are now checking balance sheets, not just growth stories.