Overview
The Market Profile is a graphic that reorganizes a trading session so you can see it the way auction theory describes it. Instead of the usual left-to-right bars, it stacks the day's activity into a horizontal distribution — a bell-shaped curve — that shows, at a glance, which prices the market spent the most time at (fair value) and which it visited briefly and rejected (excess).
It answers a question a candlestick chart hides: not just where price went, but where the market did most of its business.
Origins & history
- 1984–85J. Peter Steidlmayer developed the Market Profile at the Chicago Board of Trade, released through the CBOT's Liquidity Data Bank. It applied the normal (bell) distribution to intraday price and time.1
- 1986Steidlmayer & Kevin Koy set out the logic in Markets and Market Logic.2
- 1990Dalton, Jones & Dalton made it teachable in Mind Over Markets, connecting the graphic to trader decision-making.3
How the Profile is built
The mechanics are simple bookkeeping:
- ·Time brackets → letters (TPOs). The session is split into periods (classically 30 minutes). Each period is a letter. A "TPO" is a Time-Price Opportunity — one letter printed at one price.
- ·Initial balance. The range of the first two brackets (the first hour, A–B) is the initial balance — the opening reference the rest of the day builds from. See initial balance & range extension.
- ·The bell forms. Prices revisited across many periods grow long rows of letters; prices touched once stay single. The result is a distribution around fair value.
- ·Point of control & value area. The longest row is the POC; the central ~70% (one standard deviation) is the value area. Details on the value area & POC page.
Reading the shape
The shape of the profile is the message:
- BELLA fat, symmetrical bell = a balanced day. The auction rotated around agreed value; two-timeframe activity was in equilibrium. See balance & imbalance.
- ELONGATEDA tall, thin profile = a trend day. Value kept migrating; an other-timeframe participant was in control.
- TAILSSingle-print tails at an extreme = strong rejection (excess) — where the auction was shut off hard. Often the most reliable support/resistance.
- TWO HUMPSDouble distribution = two value areas in one session, joined by thin single prints — a sign the market moved decisively from one area of acceptance to another. See day types.
TPO vs. volume profile: the classic Market Profile counts time (letters). A modern volume profile counts contracts/shares traded at each price instead. They usually agree; where they disagree, volume shows conviction and TPO shows time spent. Most current platforms offer both.
Honest assessment
Strengths
The Profile makes the auction visible: fair value, the day's control price, and where price was rejected all pop out of the shape. It's an excellent map of where the important prices are and a natural home for support/resistance, since excess and value edges are real inflection zones.
The honest limits
It's a map, not a signal. The Profile describes what has happened; the edge comes from how you act on it. It needs quality volume/time data and a liquid, centrally-traded instrument to be clean — it shines in index futures and struggles on thin names. The 30-minute bracket and even the letter scheme are conventions, not laws; different settings can change how a day looks.
Evidence rating: a robust, widely-used organizing framework — especially among futures and index traders — but a descriptive lens whose usefulness depends on the reader's judgment and the quality of the underlying data.
Professional uses vs. retail misuses
How professionals use it
- Mark yesterday's value area, POC and excess as today's reference map.
- Judge whether today is building on, above, or below prior value.
- Use value edges and single-print tails as where to watch, confirmed by order flow.
Common retail misuses
- Treating the POC or value edge as an automatic reversal trade.
- Applying it to illiquid symbols with unreliable volume data.
- Memorizing letter patterns without reading the underlying auction.
Going deeper
Next in the series: value area & POC (finding fair price and reading its migration), then initial balance & range extension, initiative vs. responsive activity, balance & imbalance and day types. Related tools: volume, VWAP (another fair-value read), and order flow.
Practice
Quiz 1 — What is a TPO?
A Time-Price Opportunity — a single letter printed at a single price for a single time bracket. Stacking every TPO of the session builds the profile's distribution.
Quiz 2 — What does a tall, thin profile tell you?
It signals a trend day: value kept migrating in one direction instead of rotating, which means a longer-timeframe participant was in control rather than the day-timeframe crowd.
Quiz 3 — TPO profile vs. volume profile — what's the difference?
A TPO (classic Market Profile) counts time — letters/periods at each price. A volume profile counts traded volume at each price. Time shows where the market lingered; volume shows where conviction traded. They usually agree.
This concept in the knowledge graph
Resources
- TRADERSteidlmayer (creator) & Dalton (teacher of the method).
- BOOKMind Over Markets & Markets and Market Logic.
- STRATEGYValue-area fade playbook.
References (primary / free where possible)
- Market Profile — origin at the CBOT (Liquidity Data Bank, 1984–85); TPOs, value area as central ~70% (one standard deviation). Wikipedia: Market profile.
- J. Peter Steidlmayer & Kevin Koy, Markets and Market Logic (Porcupine Press, 1986).
- James F. Dalton, Eric T. Jones & Robert B. Dalton, Mind Over Markets (Probus, 1990; Wiley updated ed. 2013) — Google Books.