The AI selloff deepens: short sellers bank about 6 billion dollars on data center stocks, SK Hynix pulls a planned American listing, and CalPERS trims the Magnificent Seven

Thursday numbers set the scene. The Nasdaq fell 2.6 percent, its worst day since June, the S and P 500 fell 1.2 percent to 7,663.43, and the main semiconductor index fell about 6.7 percent, as of October 22. Nvidia fell 4.4 percent, Alphabet 3.2 percent and Advanced Micro Devices 8.1 percent. The ten year Treasury yield dropped below 5 percent in its sharpest one day fall in more than three years, as money ran to bonds.

Friday brought the stress markers. The Wall Street Journal reported that SK Hynix, one of the chief beneficiaries of the AI boom, pulled the planned American initial public offering of its memory chip business overnight. Seeking Alpha, summarizing market data, put short sellers paper gains on heavily shorted data center and neocloud names at about 6 billion dollars for October so far, with semiconductor stocks testing their 200 day moving averages. A daily market brief in Britain reported that CalPERS has sharply reduced its Magnificent Seven holdings, citing valuations and soaring spending. That British brief is a single source for the CalPERS move and the fund had not confirmed the size of the cut at publication.

The argument underneath the selling is about capital. Nvidia chief executive Jensen Huang told CNBC on Thursday that capital inside the AI buildout is becoming scarce, that demand for capital is much greater than its availability. Tesla cut its spending guidance this week, Meta projected billions more in commitments and fell 7 percent, and heavily indebted builders now have to borrow in a market where the ten year yield sat near 5 percent until Thursday flight to safety.

Ed Yardeni of Yardeni Research called the AI trade a bubble on Thursday and then made the calmer point that taking some air out of it is a good thing and need not burst into an economic problem. Premarket trading Friday suggested the rout could find a floor, with some neocloud names rebounding. Reporting what the market did is the whole of this story. Nothing here is a recommendation to buy or sell anything.