The Dow Held Steady, but Big Tech Had a Rough Week
The Dow Held Steady, but Big Tech Had a Rough Week
The Dow Jones Industrial Average rose 0.4% in the week ending Friday, Oct. 23, 2026. That was its third straight weekly gain, according to Investopedia. The other two main indexes did not follow. The S&P 500 fell 0.5% for the week, and the Nasdaq Composite fell 0.7%.
An index is a single number that tracks a group of stocks, like a scoreboard for the market. Weekly totals can hide what happened day to day. This week, most of the big moves came from large technology companies.
On Wednesday, Oct. 21, the Nasdaq, which holds many tech companies, led the market to a higher close. Quarterly results from SpaceX and Super Micro lifted the AI trade, as Reuters reported.
The mood turned quickly. On Thursday, stocks fell after Meta's earnings report brought back worries about how much money companies are spending on AI. The Nasdaq dropped 2.6%, pulled down by microchip stocks, according to Reuters. Reuters called that the Nasdaq Composite's biggest decline in four periods. On Friday, large AI stocks were mixed, and trading was quieter.
The drop had a longer setup. In mid-October, the S&P 500 was up almost 13% for 2026. Most of that gain came from AI-related stocks, per Reuters. The index had hit a record high in the week before Oct. 14.
Why does that matter? When a small group of giant AI companies drives most of a year's gains, a sell-off in that group shows up in the main headline number. The rest of the market can be steady and the index can still fall.
The Oct. 14 trading day shows two pressures at once. The S&P 500 fell 1%, pulled down by hot inflation data and a sell-off in AI-related stocks, according to CNBC. Inflation is the pace at which prices rise, and a "hot" reading means prices rose faster than expected. The Dow slid 48.62 points that day, per The Wall Street Journal.
Stock prices partly depend on the expectation of lower interest rates, which the central bank sets. Hot inflation makes lower rates less likely. At the same time, the AI sell-off hit the companies that had supplied most of the index's gains. Both pressures landed on the same day.
The Dow's different result comes mostly from how it is built. It is price-weighted, which means stocks with higher share prices have more influence, whatever their total company value. It also owns far less of the giant AI companies that drive the S&P 500 and the Nasdaq. So a third straight weekly gain for the Dow says less about the AI trade than a 0.7% drop in the Nasdaq does. If you judge your investments against one index, check which one you are using.
In my view, the most useful question for the coming days is narrower. Was Thursday's drop in AI-linked microchip stocks a one-time reaction to Meta's spending comments, or the start of a wider move out of those stocks? Nobody knows yet, and the week's trading gives only a hint.
What the week did show is this: a calm index can sit alongside a sharp drop in the stocks that have carried the market this year.
