The Nasdaq 100 concentrates the largest non-financial companies on the Nasdaq — which in practice means it is the world's big-tech barometer. It moves faster and further than the Dow or S&P 500 in both directions.
Why the Nasdaq amplifies everything
Technology giants are long-duration assets: their valuations are unusually sensitive to interest-rate expectations and to a handful of mega-cap earnings reports. That is why rate news and AI headlines often hit the Nasdaq 100 two or three times harder than the broader market.
Divergence is information
When the Nasdaq rallies while the Dow lags, money is chasing growth; when the reverse happens, investors are rotating into defensives and value. Watching the spread between the two is a quick way to read the market's mood beneath the headline numbers.