Click an index chart to expand its full history here — from one month to the index's entire history.
During the regular NYSE/Nasdaq session (9:30–16:00 ET) we show the index values directly. Outside market hours we switch to e-mini futures (ES, NQ, YM) — the same numbers premarket overviews are based on; the change is measured against the previous settlement, and the market doesn't move on weekends. Click an index chart to expand its full history in points below the grid — from one month to the index's entire history, based on its own closing values.
The three indices do not measure the same thing, and the gap between them is often more interesting than any one of them. The S&P 500 weights companies by market cap, so a handful of the largest technology names drives its moves today. The Nasdaq 100 is more concentrated still and excludes financials. The Dow Jones weights by share price rather than company size — a historical quirk that gives an expensive stock more influence than a large company.
In practice: when the Nasdaq outruns the Dow, technology and risk appetite are pulling the market; when it is the other way round, money is rotating into more defensive sectors. For crypto the Nasdaq is the more useful one — bitcoin has tracked it most closely in recent cycles, because both respond to the same thing: the price of money.