What the data reveals about the tech sell-off
It was not a comfortable week to own anything with a data centre in its business plan, with the Nasdaq falling 2.6% on 22 October and taking its loss for the month to 3.2%, while the S&P 500 – which, lest anyone forget, contains rather a lot of the same companies – has managed to stay up 0.16% month to date. The pain has been concentrated almost entirely in technology, and specifically in the corners most exposed to the AI spending boom, where the SOX semiconductor index has dropped 15% in October, including 6.7% in a single session on Wednesday.
The trigger was a fresh bout of nerves over whether the vast sums being poured into AI infrastructure will ever earn a respectable return, a debate brought sharply into focus when Meta reported its first cash outflow in over a decade and Tesla cut its 2026 capital spending plans. Investors, having spent much of the year rewarding companies for spending as much as humanly possible, appear to have remembered that the cash is supposed to come back at some point.
What makes this sell-off unusual is where the money has gone. Consumer staples (XLP) have risen 11.65% month to date, health care (XLV) 7.65%, utilities (XLU) 8.70% and energy (XLE) 9.87%, while technology (XLK) has dropped 6.85% – leaving a spread of roughly 18.5 percentage points between tech and staples in a single month, the sort of divergence that a genuine sell-everything panic would struggle to produce. If this is a crash, it’s a remarkably polite one.