This article covers the structural elements that make up a Market Profile: Time Price Opportunities (TPOs), the initial balance, value area, tails, the point of control, and the TPO count. These are the physical building blocks of the profile, and each carries specific implications about who is in control and at what price. Understanding structure is the first stage of learning the Market Profile — it provides the most tangible information, though it arrives last and confirms what time and logic signalled earlier.
- Part I: Core Structural Elements
- Part II: Value Area and the POC
- Part III: Tails and Excess
- Part IV: TPO Count
Part I: Core Structural Elements
Time Price Opportunities (TPOs)
Each half-hour trading period is assigned a letter, beginning with A for the first half-hour. Each price traded during that period gets that letter printed next to it on the profile. The result is a vertical stack of letters at each price level — a visual representation of how much time the market spent there.
A Time Price Opportunity is exactly what the name says: the combination of time (a specific half-hour), price (a specific tick), and the resulting opportunity to transact. The TPO is the smallest unit of market measurement in the Market Profile.
| Symbol | Meaning |
|---|---|
| Each letter (A, B, C…) | One half-hour period |
| Multiple letters at one price | Time accepted at that price |
| Single letter at a price | Price passed through quickly; not accepted |
| Long row of letters | High time acceptance = high volume area |
| Single-letter prints at extremes | Tails: rapid rejection by other timeframe |
Initial Balance
The initial balance is the price range established during the first hour of trading (the A and B periods). It represents the range where locals and early participants searched for value before the other timeframe entered.
The initial balance functions as a base for the day’s structure. A wider base is more stable — like the base of a lamp. A narrow base is more easily disrupted by other timeframe range extension.
Key relationships with initial balance:
- Wide initial balance: Early aggressive other timeframe entry. Reduces probability of range extension beyond the extremes. Associated with Normal days.
- Narrow initial balance: Local-driven early trade with little conviction. Higher probability of other timeframe range extension later. Associated with Trend days and Double Distribution days.
IMPORTANT
The initial balance establishes which extreme is most likely to be the day’s extreme. Monitor the first few minutes of the open. Activity during the formation of the initial balance often identifies which extreme will hold throughout the day.
Range Extension
Range extension occurs when price auctions beyond either extreme of the initial balance in subsequent time periods. It is the structural signature of the other timeframe entering the market. The more periods of consecutive range extension in one direction, the stronger the other timeframe conviction.
- Multiple-period range extension = high other timeframe directional conviction
- Single-period range extension = moderate conviction, monitor for continuation
- No range extension = market contained within initial balance = other timeframe absent
Part II: Value Area and the POC
The Value Area
The value area is the range of prices where approximately 70 percent of the day’s trading volume occurred. It represents one standard deviation of the distribution. Visually, it is the widest part of the profile’s bell curve.
The value area is the market’s statement of accepted value for the session. Both buyers and sellers transacted within this area, confirming both parties perceived the prices as fair. This is the reference point for the next session — whether the market opens inside value (in balance) or outside value (out of balance) carries major implications for trade risk and opportunity.
NOTE
The value area can be calculated using TPO counts (70% of all TPOs) or actual price/volume data from the Liquidity Data Bank. Appendix 1 of Mind Over Markets details the calculation.
Point of Control (POC)
The point of control is the price with the highest volume for the session — the longest horizontal line of TPOs, closest to the centre of the range. It is the fairest price for the day: the price where the greatest amount of time was spent, meaning the greatest number of transactions occurred there.
Dalton increasingly refers to the POC as the fairest price rather than just the POC, because this framing is more useful:
- Buying above the fairest price = buying above value (above-average risk)
- Selling below the fairest price = selling short-in-the-hole (below value)
- The fairest price migrating upward through the session = consistent other timeframe buying
- Stagnant fairest price = balanced, no dominant timeframe control
Monitoring the Fairest Price Through the Session
The migration of the POC through the day is one of the clearest indicators of developing timeframe control:
- If range extension moves the POC higher each period, the other timeframe buyer is in control
- If the POC stops migrating, the balance between buyers and sellers is returning
- When POC migrates despite rotational activity, re-split the profile to identify a running profile from the point of transition
Part III: Tails and Excess
Buying and Selling Tails
A tail is a series of single-print TPOs at the extreme of a profile (high or low), where price was quickly rejected by the other timeframe. Tails require at least two TPOs to be significant.
Buying tail: Single-print TPOs at the bottom of the profile. The other timeframe buyer entered aggressively as price auctioned too low, rejecting it upward. This indicates strong responsive buying conviction at those prices.
Selling tail: Single-print TPOs at the top of the profile. The other timeframe seller rejected higher prices and drove price back down. Strong responsive selling conviction.
| Tail Feature | Implication |
|---|---|
| Tail 2+ TPOs long | Significant. Strong other timeframe response. |
| Tail length increases | Stronger conviction |
| No tail on an extreme | Absence of aggressive other timeframe activity. Less reliable extreme. |
| Tail in last period of day | Not technically a tail (unconfirmed). Requires next-session follow-up. |
IMPORTANT
Tails become the most important reference points for range estimation and subsequent-day analysis. The other timeframe participant that created the tail is expected to respond similarly at those price levels in the future. When price returns to test a tail, monitor whether it holds or is violated.
Poor Highs and Lows
A poor high or poor low is a session extreme without a tail. This indicates the high or low was not created by aggressive other timeframe rejection, but by the market running out of time or the day timeframe running out of inventory. Poor highs and lows represent incomplete auctions that often see the market return to complete them.
A poor low on an up day means the session close is too close to the low, and the market may open higher the next day and then correct back to “complete” the tail. Similarly for poor highs on down days.
The Closing Range
The closing range (the last period of the day) is the market’s final statement of sentiment. Its position relative to the day’s range tells you which participant controlled into the close:
- Close on upper third: buyer conviction into the close
- Close in middle third: balance, neither side dominant
- Close on lower third: seller conviction into the close
The closing range is compared to the next day’s open to detect overnight sentiment changes.
Part IV: TPO Count
Measuring Imbalance in the Body of the Profile
The TPO count measures the imbalance between buyers and sellers within the developing value area. While tails and range extension reveal other timeframe activity on the extremes, the TPO count detects more subtle activity in the body of the profile.
How to calculate the TPO count:
- Identify the point of control (longest line closest to the centre of the range)
- Count all TPOs above the POC = selling TPOs
- Count all TPOs below the POC = buying TPOs
- Exclude single-print tails (these are already accounted for)
- Express as a ratio: e.g., 32 selling / 24 buying
Interpretation:
- More TPOs below POC: other timeframe buyers are more active within value. They are holding price below the POC, indicating they are absorbing selling and building inventory.
- More TPOs above POC: other timeframe sellers are more active within value
- Balanced count: locals are in control, two-timeframe trade
NOTE
A growing TPO count below the POC without downside range extension typically indicates that locals (not other timeframe sellers) are selling to other timeframe buyers. When locals become too short, they cover, briefly driving price upward. This restores balance and often precedes a decisive upward move.
Using the TPO Count in Context
The TPO count must be interpreted within the broader picture. Key rules:
- A TPO count imbalance is most meaningful when it persists across multiple time periods
- If the count favours buyers but selling range extension occurs, the structural evidence overrides the body count
- End-of-day imbalances often carry momentum into the next session
Sources
- Jim Dalton, Eric Jones, Robert Dalton, Mind Over Markets (Updated Edition, Wiley Trading)