Cash index versus E-mini Dow futures: technical differences
The cash index is calculated from constituent prices. Futures incorporate contract expiry and carry; continuous futures can change when the chart rolls or back-adjusts. A broker’s CFD quote need not match either. Do not transfer a level or volume calculation between these instruments without checking the basis.
| Feature | Cash index / underlying equities | YM / MYM futures |
|---|---|---|
| Session | U.S. core equity session is 09:30–16:00 New York time; holidays and early closes differ | CME lists Sunday–Friday 18:00–17:00 ET, with a 16:15–16:30 halt and the daily 17:00–18:00 break; consult current contract and holiday schedules |
| Gaps | Compare prior index close with the next opening calculation; not a guaranteed fill target | Breaks, news, contract rolls and back-adjustment can create chart discontinuities |
| Volume | The index has no directly traded volume; any displayed component aggregate is a vendor-defined series | Use the specified contract’s reported volume. Bid/ask delta requires additional trade classification, not just OHLCV |
| Use | Describe the benchmark’s trend or compare constituents | Evaluate a specified tradable contract, its multiplier, liquidity and costs |