Market Profile (TPO)

A standard candlestick chart shows you the total volume for the day at the very bottom of the screen.

If a stock traded between ₹100 and ₹110 today, and 5 million shares changed hands, the candlestick chart tells you that the 5 million shares traded. But it cannot tell you where they traded.

Did 4.9 million of those shares trade exactly at ₹105, while the rest of the range was completely empty? Or were the 5 million shares spread perfectly evenly from ₹100 to ₹110? If you don't know at what price the volume occurred, how can you know where the real support and resistance is?

In the 1980s, a Chicago Board of Trade trader named J. Peter Steidlmayer developed a way to rotate the chart 90 degrees. Instead of plotting price over time, he plotted time over price.

He viewed the market as an auction. If a price is considered "fair value", buyers and sellers will spend a lot of time trading there. If a price is considered "unfair" (too high or too low), they will reject it quickly.

By stacking letters horizontally for every 30-minute block of time spent at a specific price, Steidlmayer created a chart that builds a literal bell curve of value on your screen. This is Market Profile (or Time Price Opportunity - TPO).

Here is how a Market Profile is built during a trading day:

1. The day is chopped into 30-minute periods, each assigned a letter. (9:15-9:45 is 'A', 9:45-10:15 is 'B', etc.)
2. If the stock trades at ₹105 during the 'A' period, an 'A' is stamped at the ₹105 level.
3. If it trades at ₹105 again during the 'B' period, a 'B' is stamped next to the 'A'.

Prices that are rejected quickly only get one or two letters. Prices where the market agrees on fair value accumulate massive, long rows of letters.

Click Play Trading Day below to watch a bell curve form.

Every price in this module is an illustrative example, not a real quote. [illustrative]

Market Profile turns abstract support and resistance into mathematically visible zones.

1. The Point of Control (POC): This is the single price level with the longest row of letters (highlighted green in the diagram). It is the price where the market spent the most time. It tends to act like a magnet: when price drifts away from the POC on low volume, it often rotates back to it — a tendency, not a rule, and one that fails the moment fair value genuinely changes (see below).
2. The Value Area: This is the cluster of prices surrounding the POC where 70% of the day's trading took place (one standard deviation of the bell curve). If the price opens outside yesterday's Value Area and cannot get back in, a strong trend day becomes likely — the market is signalling it no longer agrees with yesterday's value.

Market Profile is a map of where business was done, but it doesn't tell you who initiated it.

If 10,000 shares trade at the Point of Control, Market Profile just sees a transaction. It doesn't tell you if a massive buyer aggressively slapped the ask to acquire those shares, or if a desperate seller dumped them on the bid. For that, you need Order Flow analysis.

The biggest trap with Market Profile is treating the Point of Control (POC) as an unbreakable wall.

A POC from three days ago is a magnet only while the market still agrees that price was fair. If the fundamental news has changed, that old "fair value" is meaningless. If a company announces terrible earnings, the price can slice straight through yesterday's POC as if it isn't even there, because the definition of fair value just changed in real-time.

The hard part is that both readings look identical on the screen. When price drifts away from the POC, you cannot tell from the profile alone whether it will rotate back or keep going.

Before you trust the POC as support, ask: what would change your mind? If price reaches the old POC and keeps slicing through it on rising volume, the read flips: fair value has moved, and the magnet is gone.

Market Profile gives us the "Where" (at what price did the market agree on value). But to truly understand the micro-structure of the market, we need to zoom in so close that the chart disappears entirely, leaving only the raw numbers of the live auction.

That brings us to the ultimate truth of the market: The Order Book.