AI-linked shares fall sharply as inflation and AI debt fears collide

In plain words

Shares of companies tied to artificial intelligence fell sharply on Wednesday and Thursday. US prices rose faster than expected in September, so traders now expect interest rates to go up, which makes borrowing more expensive. Many AI companies borrow heavily to build data centres, so higher rates hurt them more than most. The International Monetary Fund had warned this week that a fall in AI share prices could spread across the world. No one can say yet whether this is a short dip or the start of a longer fall.

What happened

US consumer prices rose 3.7% in September from a year earlier, above the 3.6% economists expected. The S&P 500 fell 1.1% on Wednesday and the Nasdaq Composite fell 1.9%, the worst day for each since July. US stocks fell further when trading resumed on Thursday.

In Asia, South Korea's Kospi 200 fell 8.1%, a six-month closing low, and trading was halted at several points. SK Hynix and Samsung Electronics, two memory-chip makers, fell nearly 11% and 9.5%. Japan's Nikkei 225 dropped 4.9%, with SoftBank, a large investor in OpenAI, down 10%.

Cointelegraph reports that of 23 AI infrastructure stocks tracked by one index, 21 declined on Wednesday, with an average loss of 7.46%. Data-centre operator CoreWeave fell 16%. Bitcoin miners that have expanded into AI infrastructure fell by more than 12%.

The BBC notes that shares had been falling earlier in the week after remarks by the Broadcom chief executive, Hock Tan, about AI spending.

What is confirmed and what is not

The price moves and inflation figures are reported by all three outlets from market and government data. The explanation is the outlets' interpretation: they attribute the falls to inflation and to worries about debt-financed AI spending, and the sources do not prove that these were the causes.

Fed rate hikes are expected but not decided. Cointelegraph reports that the implied probability of an October hike briefly exceeded 50% on Wednesday before falling back, and that San Francisco Fed President Mary Daly said there was no urgency to act this month.

Not known: whether the fall continues, and how much of the move reflects inflation as opposed to doubts about AI spending itself.

Analysis

Markets. The mechanism is straightforward. Higher expected interest rates raise borrowing costs, and Cointelegraph notes that many AI infrastructure companies rely heavily on debt to finance data-centre expansion. If rates rise and AI spending continues to be funded by borrowing, these companies' valuations become more sensitive to each inflation report. If inflation cools, the pressure would ease. This is conditional reasoning, not a forecast of prices.

Technology. If financing becomes more expensive, some data-centre and chip projects could be delayed or repriced. That would affect how quickly new AI computing capacity arrives. The sources do not report any cancelled project, so this is a possible channel, not an observed effect.

Financial stability. The IMF said the consequences of an AI correction could be global, with Asia most exposed and the UK and eurozone potentially more insulated. Thursday's falls in Korea and Japan fit that description, but one day of data is not a pattern.

Crypto. Bitcoin miners that now run AI infrastructure fell with AI stocks. That suggests part of the sector now trades on AI-related news as well as on Bitcoin. This is an inference from one day's moves.

What could make this view wrong: inflation data that cool quickly, a Fed that holds rates, or strong results from AI companies that restore confidence.

What can be done

This is general information, not investment advice. Investors can check how much of their holdings is concentrated in AI-linked companies and avoid decisions based on one day's moves. Companies that depend on borrowed money can test how their plans hold up under higher interest costs. Regulators and central banks are already watching the risk, as the IMF's warning shows.