TPO rewards a specific habit: read the structure before the session, mark the levels, then let price come to them. These are the profile patterns traders commonly mark, what each one is read to imply, and how traders commonly interpret them.
Same disclaimer as the footprint playbook: structure is context. The profile tells you where the interesting conversations will happen, the footprint and tape tell you who is winning them.
The value area
The base case: the market spends most of its life rotating inside or near value. When price opens inside the prior value area, the common Market Profile reading is rotation: moves from VAH toward POC and VAL, and back. In balanced-market theory, the value area edges are read as the areas where rotation back toward the POC can begin.
The 80% rule: when price opens outside the prior value area and then re-enters it and holds (classically two periods), Market Profile practitioners read it as favoring a traverse to the other side of value; it is a heuristic, not a statistic OpenMarket measures. On OpenMarket, keep prior-session VAH, VAL, and POC visible (Profile tab: prior session levels) so re-entries are impossible to miss.
Breakout from value: letters building outside value after a clean exit is read as acceptance of new prices, and a mean-reversion reading no longer fits. The prior VAH or VAL is then commonly watched as the pullback reference.
Open location: the first read of the day
Where the session opens relative to yesterday's profile is how Market Profile traders frame the day:
- Open inside value: read as balance, with rotation between the edges.
- Open outside value but inside range: mild imbalance; watch whether price accepts back into value (80% rule setup) or builds value where it is.
- Open outside range: read as true imbalance, the setting where trend sessions most often develop. Traders watch whether the open is defended (open-drive behavior), and a mean-reversion reading fits these sessions less well.
Poor highs and poor lows: unfinished endings
What you see: two or more letters flat at the exact session high or low, instead of a single tapering print. The profile ends in a shelf, not a point.
What it means: the auction at the extreme never finished. Buyers (at a poor high) ran out of time rather than sellers showing up with conviction.
How traders read it: poor extremes are commonly read as levels likely to be revisited and weakly defended when tested. Market Profile traders read a poor high above price as an unfinished level rather than a firm ceiling. Once repaired (taken out and rejected with a clean tail), the level is considered resolved.
Single prints and tails
What you see: a run of prices holding a single letter. In the middle of a profile they are single prints left by a fast traverse; at the extremes they are tails left by an aggressive rejection.
What it means: single prints mark prices where one side was in such a hurry that no two-sided trade happened. Tails at extremes are strength: someone rejected those prices emphatically.
How traders read it: single-print gaps in the middle of a profile are commonly read as thin areas price can move through quickly, and they are often filled later. Tails are read as rejection that is expected to hold on retest; a revisited tail that does not hold is read as the rejection having expired. OpenMarket can mark singles for you (Profile tab: structure markers).
Initial balance extensions
What you see: the initial balance (first-period range) marked on the profile, and the session extending beyond it one side or both.
What it means: a session that extends one side of the IB early and keeps building letters there is a trend session in the making. A session poking both sides of the IB without follow-through is a chop session, where range edges are read as more relevant than breakouts.
How traders read it: the IB high and low are the first reference levels of the session. Range extension with rising value (visible in the developing VAH/VAL) is read as trend; range extension that immediately re-enters the IB is read as a failed breakout, which can travel to the opposite IB extreme.
Sessions and aggregation
Crypto trades around the clock, so session choice shapes everything on this page. The default sessions work for most, but the custom sessions editor (General tab) lets you profile the windows you actually trade: the US morning, the Asia open, or one profile per week for the bigger map. Merging or splitting sessions redraws the structure, so pick a scheme and keep it consistent; levels only mean something if you derive them the same way every day.