What Is Market Profile?

Volume Profile shows you where volume concentrated. Market Profile shows you where time concentrated. Same market. Different lens. Together they give you a complete picture of what the session actually did.

Time = acceptance

Market Profile was developed by J. Peter Steidlmayer at the Chicago Board of Trade in the 1980s. The insight behind it is simple: the market is an auction. When price trades at a level for extended time, both buyers and sellers agreed on it. That's acceptance. When price passes through a level quickly, it was rejected as unfair.

Every 30-minute period of the trading session is assigned a letter starting at A. At every price level that period touches, that letter gets printed. You end up with a sideways histogram made of letters. The widest rows are where price spent the most time. The thin rows are where it moved through fast.

What the structure looks like

Below is a typical balanced session Market Profile. Periods A and B (in blue) establish the Initial Balance. Later periods build within and extend it. The POC is the row with the most letters.

What each part means

Point of Control (POC). The row with the most letters. Same concept as Volume Profile POC but measured by time, not volume. Price spent more time here than anywhere else.

Value Area. The range containing 70% of the session's TPO count, centered around the POC. VAH at the top, VAL at the bottom. Same 80% rule applies: price opening inside the prior value area has a statistical bias toward filling to the opposite extreme.

Initial Balance (IB). The range established in periods A and B (first 60 minutes). The most important intraday reference level. Everything after it is measured against the IB. Wide IB = volatile open. Narrow IB = waiting market.

Single prints. Rows with only one letter. Price was here for just one 30-minute period and moved away. Thin areas of the profile. They represent rejected prices and unfinished auctions. More on this in a later lesson.

When they agree and when they don't

Most of the time, the VP POC and MP POC sit close to each other. When they do, that level is extremely significant. Both time and volume point to the same price as the most accepted.

When they diverge, it's worth understanding why. A price level with high time but low volume could mean a large participant was absorbing at that price quietly. Or it could mean thin, retail-dominated activity without real conviction. The divergence itself is a question worth asking.

As a practical rule: start with Volume Profile for level identification, use Market Profile to understand the structural context and day type. They answer different questions.

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