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Market profile
Working definition
A histogram of time spent at each price, built from half-hour TPO brackets into a distribution whose value area and point of control describe where the session found acceptance.
Market profile is a rearrangement so useful it became a school: take the session apart into half-hour brackets, and stack them by price instead of time.
The construction is mechanical. Each bracket gets a letter; each letter marks every price its bracket touched — one mark per price per bracket, a time-price opportunity. Stack the letters and the session becomes a histogram of time at price. The modal price is the point of control; the tightest band holding the conventional seventy percent of marks is the value area; prices touched in only one bracket print as the singles the vocabulary reads as conviction moves. The construction is Steidlmayer’s, built at the Chicago Board of Trade in the 1980s, and the auction vocabulary that grew around it — balance, imbalance, acceptance, rotation — is the school.
The essential edge against its louder cousin: volume profile counts volume at price, this counts time at price, and the difference is not pedantry. A price that holds for an hour on thin trade and a price that absorbs a flood of volume in three minutes are opposite microstructural events, and the two profiles file them oppositely. On quiet, balanced sessions the shapes rhyme; on the sessions anyone cares about, they diverge, and knowing which tool said what is the difference between an observation and a muddle.
Two honesty notes travel with the FX use. The time-at-price arithmetic ports to any market with prices and a clock. The session does not: the construction assumes a bounded auction with an open and a close, and a continuous over-the-counter market has neither without an election — so every FX profile inherits a session-boundary choice, and profiles built on different boundaries are different objects. And the bell-curve ideal the vocabulary leans on is an analogy: sessions are not samples from a fixed distribution, and the profile’s shapes license reading, not inference.
What remains, as everywhere in this corner of the glossary, is the gap between the readable and the proven. Value-area edges and points of control are precisely defined once their elections are stated; whether price respects them beyond what matched arbitrary levels would show is a measurable question, and the two lenses hold the reading and the claim apart.
Commonly confused with
Neighbouring concepts that get used interchangeably, and the distinction that actually separates them.
- Volume profile
Volume profile counts contracts traded at each price; market profile counts time spent there, letter by letter. The two shapes often agree and are different measurements — a price can hold for an hour on thin trade, or absorb enormous volume in minutes, and the two tools file those opposite events oppositely.
- A candlestick chart
Candles serialise the session into time slices; the profile stacks those slices into one distribution and lets the shape speak. Nothing is added — the profile is a rearrangement — but the rearrangement is the tool: distributions show balance and imbalance that sequences hide.
- Support and resistance
Classical levels earn their names from touches and holds. Profile features — value area edges, the point of control, single prints — earn theirs from the distribution's shape. The vocabularies overlap on the chart and are built from different arithmetic.
- A normal distribution
The profile's bell-shaped ideal is an analogy, not a statistical claim. Sessions are not samples from a fixed distribution, and treating profile shapes as statistical objects — with the inferences that would license — imports rigour the construction does not have.
How to measure it in your own data
A definition you cannot test is a definition you have to take on trust. This is the shortest honest route from the concept to a number you computed yourself.
- Records you need
Timestamped price data over the session, bucketed into the declared bracket length — half-hour periods in the original construction — plus the price increment election.
- What you compute
Assign each bracket a letter; mark the letter at every price the bracket touched; stack the letters into the histogram. The point of control is the price with the most letters, the value area the tightest band holding the conventional seventy percent of them. Bracket length, increment and share are all elections.
- What the answer tells you
A balanced session stacks into the bell the vocabulary expects, with a fat middle and thin tails; an imbalanced one prints elongated ranges, single prints and a value area migrating directionally. The shapes are readable; what they predict is a claim the reading does not settle.
Questions and answers
What is market profile in trading?
A way of drawing a session as a distribution of time at price: half-hour brackets each mark the prices they touched, the marks stack into a histogram, and the resulting shape — value area, point of control, tails — is read as the session's auction structure. It originated with J. Peter Steidlmayer at the Chicago Board of Trade in the 1980s.
What is a TPO?
A time-price opportunity — one bracket's mark at one price. The profile is nothing but TPOs stacked: count them by price and the distribution appears. Everything else in the vocabulary is a name for some region of that stack.
Is market profile the same as volume profile?
No: one measures time at price, the other volume at price. They frequently agree on where the session's business happened, and they disagree exactly when heavy volume moved through a price quickly — an event volume profile records loudly and market profile barely notices.
Does market profile work in forex?
The time-at-price construction ports cleanly, since it needs only prices and a clock. The auction inferences built on it were developed for centralised, session-bounded markets — a continuous OTC market has no closing bell to define the session without an election, so the FX version inherits a session-boundary choice the original never had to make.
Related terms
Derived from the links this entry makes and the entries that link back to it.