Initial Balance (IB)
Trader's Glossary · Profile and auction

Definition. The price range of the first hour of the regular session: 9:30–10:30 AM New York time (usually 15:30–16:30 in Warsaw).
How it works
The first hour sets the day's initial range. Its width, and whether the market extends it later, tells you about the activity of longer-horizon participants. IB extensions are multiples of its width projected above and below.
Example
A narrow IB followed by a clear break in one direction often accompanies wider-range days. A wide IB more often means a day traded within it.
What to watch out for
These are tendencies, not rules. In the clock-change weeks the IB falls an hour earlier in European time.

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See also
Market Profile (TPO), Regular and overnight session, Acceptance and rejection.
More in Hetman Capital Club
You'll find the full explanation with graphics, examples and exercises in the 📖 Order flow encyclopedia space, and its use in the live market in the 🔴 Live Room. Both are available to Club members (in Polish).
Educational content, not investment advice.