Sessions & rolls

Nearly 24 hours, five days a week

CME equity index futures trade electronically from Sunday evening to Friday afternoon, US Eastern time, with a short daily pause in the late afternoon. Check CME's current hours — holidays change them.

That long day is usually split into two parts:

• Overnight (ETH / Globex) — from the evening open until the US stock market opens. Usually thinner volume and slower trade, with activity rising around the European session and around scheduled data.
• Regular trading hours (RTH) — lined up with the US stock market, which opens at 9:30 am ET. This is when most of the day's volume trades.

Why the open matters

The first part of the US session is where the day's largest participants show up. Volume jumps, ranges expand, and the market often decides whether it will rotate inside yesterday's value or move away from it.

Two references worth marking every day:

• Overnight high and low — the edges of the overnight auction.
• Opening range — the high and low of the first few minutes of RTH (for example the first 15 or 30 minutes).

Whether price accepts or rejects the area outside these ranges is one of the first reads of the day.

Data releases

Scheduled economic data (inflation, jobs, central bank decisions) can move index futures several points in seconds. Know the calendar. Many traders simply stay flat into major releases.

Contract months and the roll

Index futures expire quarterly: March, June, September and December, with month codes H, M, U, Z. For example, ESZ6 is the December 2026 ES contract.

Volume moves from the expiring contract to the next one about a week before expiration — the roll. After the roll:

• Make sure your chart and your order entry use the new contract.
• The new contract trades at a different price from the old one (the difference is mostly interest and dividends), so levels from the old contract don't transfer point-for-point. Many platforms offer a back-adjusted continuous chart for this reason.