A Period

What is A Period?

A period is the first 30 minutes of the trading day, from 09:30-10:00 AM EST. It's typically the time when the market is most active and the most volume is traded. The high and low of A period forms the opening range in Auction Market Theory.

Explore in the Session Lab

See how A Period plays out in real market data with our daily session analysis tools.

Open Session Lab Access Dataset

Option Expiry, OP-X, or OPX B Period