TPO / Market Profile (Time Price Opportunity)
A short-term trading method that stacks letters to show how long trading lingered at each price level during the day, revealing where price spent the most time.
TPO = for each fixed time unit (usually 30 minutes), one letter is marked at every price traded during that period, stacked sideways along the price axis
The single row with the longest stack of letters is called the POC (Point of Control), and the middle zone holding roughly 70% of all trading is called the Value Area.
In plain terms
The trading day is cut into 30-minute slices, and each slice gets one letter (A, B, C…). For every price traded during that 30 minutes, that letter is marked. Stack these sideways along the price axis and some prices end up with long strings of letters while others have short ones. The prices with long strings are where trading lingered that day.
As it builds up, it usually forms a bell shape that bulges in the middle. The bulging middle is the price zone people considered reasonable and stayed at for a long time, while the short parts stretching above and below are prices that were only touched briefly. It's a chart stacked by "time" rather than by price.
What it tells you
TPO shows where price spent the most time, and is used to read which price zones market participants accepted as fair.
Price zones where trading lingered are sometimes seen as acting later like support or resistance levels. That is why short-term traders use it as a reference for gauging the flow.
Formula
TPO = for each fixed time unit (usually 30 minutes), one letter is marked at every price traded during that period, stacked sideways along the price axis Prices with long rows of letters = prices where trading stayed the longest
What high or low means
The single row with the longest stack of letters is called the POC (Point of Control), and the middle zone holding roughly 70% of all trading is called the Value Area. These two are the points most often watched in Market Profile.
If price is above the Value Area, it is sometimes read as trading on the higher side of that day's average, and below it as the lower side. That said, this is only that day's trading distribution and is a different matter from judging a company's actual value.
TPO is essentially an intraday short-term trading tool drawn from minute- or hour-level data. It looks at an entirely different time frame from long-term, fundamental investing that views a company over days to years, so the two don't mix under the same yardstick.
The "value" (Value Area) in TPO does not mean accounting-based corporate value; it refers to the price zone where the day's trading gathered. The similar name makes it easy to confuse with value concepts like margin of safety or DCF, but it is an entirely different thing.
Stocklore centers on financials and fundamentals, so it does not draw TPO charts directly. This entry exists only to explain the term so you can look it up when you hear it on market broadcasts or professional trading platforms.
TPO and Market Profile is an analytical method created in the early 1980s by Peter Steidlmayer, a trader at the Chicago Board of Trade (CBOT). Back when real-time charts were scarce, he hand-wrote each day's trading in 30-minute letters to draw out the price distribution.
It was originally a tool that futures traders on the exchange floor used to quickly read "what price does the market consider fair today," so from birth it has been geared toward short-term intraday flow. That gives it a different character from long-term value yardsticks such as margin of safety.
Metrics to read alongside
See it in real stocks
Search US stocks on Stocklore to see SEC-filing-based financial metrics alongside the sector benchmark.
This explanation is for information and reference only and is not a recommendation to buy or sell any security. Investment decisions and their consequences are your own.