Marking up a chart means deciding, before the session opens, which price levels matter and what you will do at each one. You draw the overnight high and low, the prior day's range, and the levels price has already reacted to — and nothing else. The point is to finish deciding before the market can pressure you.
Almost every bad intraday decision is made under time pressure. The markup exists to move the thinking to a moment when there is no pressure at all. Once the bell goes, you are not analysing; you are checking whether price has arrived somewhere you already thought about.
The five levels worth drawing
A useful chart is not a complete chart. These five carry most of the information, and they are the ones the rest of the market is watching too:
| Level | Where it comes from | What it tells you |
|---|---|---|
| Prior day high / low | Yesterday's regular session extremes | The edges of the last agreed range; breaks of them start moves |
| Prior day close | Yesterday's settlement / closing print | The reference everyone measures today's gain or loss against |
| Overnight high / low | Globex or after-hours session | Where price traded while you slept — the first levels tested at the open |
| Higher-timeframe levels | Weekly / daily chart, reacted to twice or more | The lines that matter to size-holders, not just to intraday traders |
| Session open | The first print of the regular session | A running scoreboard: above it buyers are winning the day, below it sellers are |
Draw them as horizontal lines, not zones you can reinterpret later. A level you can slide two dollars in either direction while the trade is live is not a level; it is a way of avoiding being wrong. If you genuinely trade zones, define the width now and leave it alone — the discipline in supply and demand zones is exactly that the boundary is fixed before entry.
A fifteen-minute routine
- Start on the weekly, then the daily. Two minutes. You are not looking for trades. You are answering one question: is this thing trending, ranging, or in the middle of nowhere? That answer decides which trades you will even consider today.
- Drop to the hourly and mark the reaction levels. Five minutes. Only prices where the chart visibly turned, and preferably more than once. If you have to squint to see the reaction, it is not a level.
- Add the session lines. Three minutes. Prior day high, low and close; overnight high and low. These are mechanical — no judgement required.
- Delete something. One minute, and the most underrated step. Any line price has sliced straight through twice without pausing has stopped being a level. Remove it.
- Write the if-then list. Four minutes. Two or three sentences per instrument, in plain language: if price breaks and holds above the overnight high, I am looking long toward the prior day high; if it rejects there, I do nothing. This is the actual output. The lines are just the working.
Why the open deserves its own plan
The first fifteen minutes are not a normal fifteen minutes, and that is not trader folklore — it is written into US market plumbing. Under the SEC-approved limit up-limit down mechanism, individual stocks have price bands of 5%, 10% or 20% around their five-minute average price depending on the stock's price, and those bands are doubled during the opening and closing periods of the trading day (SEC Investor Bulletin: New Measures to Address Market Volatility). The same bulletin sets market-wide circuit breakers at declines of 7%, 13% and 20% in the S&P 500.
Read the doubled band for what it is: the regulators expect the open to move further and faster than the rest of the day, and have deliberately given it more room before intervening. Your markup should reflect the same expectation. Levels that hold at 11:00 get blown through at 9:31, which is why plenty of experienced traders mark the open and then simply do not trade it. Deciding that in advance is part of the markup, and the session-by-session breakdown of when the market actually moves is worth reading alongside this.
What to leave off the chart
- More than two indicators. Six tools computed from one price series is one opinion repeated six times, and each one costs you a fraction of a second at the exact moment you need to be decisive.
- Trendlines drawn through wicks and bodies interchangeably. Pick a convention and hold it, as covered in drawing a trendline correctly. A line that only exists because you were flexible about which points it touches will not be respected by anyone else.
- Levels from three months ago on a five-minute chart. Timeframes have a natural reach. A daily level matters intraday; a monthly level rarely does unless price is genuinely near it.
- Price targets you invented. A target should be the next level price would reasonably travel to, not a round number that would make your day.
Marking up more than one timeframe
The mistake is drawing a separate set of levels per timeframe. Draw one set, sourced from the higher timeframes, and view it on the lower ones. The chart you trade from should show levels that were decided somewhere more important than the chart you trade from — that is the whole argument in multi-timeframe analysis. If a level only exists on the two-minute chart, roughly nobody else can see it.
Two timeframes is usually the right number for a session: one for context, one for execution. Three is defensible. Four means you will find a reason to justify any trade, because at four timeframes something is always confirming something.
Frequently Asked Questions
How long should marking up a chart take?
Fifteen to twenty minutes for a handful of instruments, once you have a routine. If it is taking an hour you are drawing too much. The markup is not analysis for its own sake — it is a short list of prices where you have already decided what you would do. A chart with six lines on it takes ten minutes to prepare and two seconds to read at the moment it matters, which is the trade you are actually making.
Which levels should you draw on a chart before the open?
Five are usually enough: the prior day's high and low, the prior day's close, the overnight session high and low, and the two or three higher-timeframe levels price has already reacted to more than once. Add the pre-market range extremes if you trade equities. Everything past that competes for attention with the levels that matter, and a chart where every price is a level is a chart with no levels at all.
Should you mark up the chart the night before or the morning of?
Do the higher-timeframe work the night before and refresh the session-specific levels in the morning. The weekly, daily and four-hour structure does not change overnight, so preparing it in a calm moment produces better decisions than preparing it fifteen minutes before the bell. The overnight high and low, and any level created by news, are the only parts that genuinely need a morning update.
Do you need to redraw your levels every day?
No. Good levels persist for weeks, and the ones that keep getting respected are the most valuable things on the chart. What you do daily is add the previous session's high, low and close, remove levels price has cut straight through twice without reacting, and confirm the higher-timeframe lines are still where you drew them. Rebuilding from scratch every morning throws away the history that makes a level credible.
Bottom line
A pre-session markup is five or six horizontal lines and a short written if-then list, produced in fifteen minutes while nothing is at stake. It works because it moves every meaningful decision out of the moment when you are least capable of making one, and because the levels you draw — prior day extremes, overnight extremes, higher-timeframe reaction prices — are the ones the rest of the market is looking at too. Build the habit alongside technical analysis basics, learn to pick levels properly in support and resistance, and write the routine into a trading plan you will actually follow.