Single prints

NQ, 12:00 ET (00:00 ICT, winter). One 30-minute bracket lifts price 10 points and keeps going, barely pausing. On the TPO chart, that stretch shows up as a thin column of single letters. Later in the week price comes back into the same zone. Is that zone special — does it get “filled”, does it hold — or is it just the record of a hurried half hour? This lesson gives you the definition, what the letters do and do not tell you, and what the data says when traders use them as levels.

Single prints (vết in đơn) are prices with only one TPO: one 30-minute bracket traded there and no other bracket ever came back Definition. They record urgency: the auction was in a hurry and did not stop to negotiate. On the letter chart they look like a thin vertical trail, a single column of letters with no width. They are the TPO-language cousin of an LVN (M2.03): an LVN is thin in volume, single prints are thin in time.

Chart first: the market in a hurry

The read: the auction lived at 18,030–18,040, hurried through 18,042–18,046, and started living again at 18,048–18,052. That is a description of where time was and was not spent Definition. It tells you that no second bracket ever did business at 18,042–18,046. It does not, by itself, tell you what happens if price comes back there.

Single prints appear on the developing profile intraday — you don’t need the close to see them. When a bracket leaves a trail of singles, its initiative is already on the record.

Initiative is not acceptance

Single prints are initiative evidence, not acceptance evidence Definition: the move was urgent, but urgency isn’t agreement. A single-print rally that later gets filled in with wide, overlapping brackets has been accepted — the auction came back and did the business it skipped. A single-print zone that stays thin was a probe the market never ratified. Both are descriptions of what has happened so far, read from the letters.

Two popular claims go further than the letters, and they are where traders get hurt:

Myth / hypothesis: “Single prints always get filled”, and its cousin “single-print edges act as support and resistance.” Many zones are revisited, some stay open for weeks, and a revisit rate means nothing until you compare it with random prices at the same distance. Compared that way, both our lab and one practitioner’s NQ study found no edge (see “What the data says”) Lore. Singles are a watch-list zone, not a target and not a floor.

Myth / hypothesis: “Price travels fast through single prints on the way back.” It follows the same logic as the LVN fast-travel idea: little prior business, so little to slow price down. For single prints themselves it is not yet measured. The volume twin has only a weak lean in one practitioner’s NQ study that did not survive its own correction for testing many claims (M2.03) Lore. Treat it as a hypothesis to log, not a speed you can plan a stop around.

Why it is still worth knowing

• Shared vocabulary. “Left singles”, “filled in the singles” and “the singles held” are how profile traders, and later lessons, describe a session in one line.
• It describes the auction. Singles mark where one side was urgent and the other did not show up. Whether they later fill in tells you whether that initiative was ratified.
• It frames risk. If your idea is “this initiative will be accepted”, the auction filling in the singles supports it, and a return through the whole zone to the old width says the idea was wrong — a written place to define your invalidation.
• It is a hypothesis you can test. If you believe singles fill or hold for you, log every zone with a written rule and a random-price comparison (the drill below).

Singles, tails, and the volume behind them

Three distinctions keep the concept clean Definition:

• Singles inside the profile vs singles at the edge. A run of single prints at the very top or bottom of the day — especially two or more ending at the extreme — is read as a tail (excess, M2.09): the auction went too far and was refused. Singles between two areas of width, like 18,042–18,046 above, are a gap in the middle of the day’s auction. Same letter count, different story.
• Singles are about time, not size. One bracket can trade huge volume. A violent news bracket can leave single prints and a fat volume node at the same prices. In that case the TPO says “no time spent” while volume says “lots of business done” — check both before calling the zone thin (M2.06).
• Singles depend on bracket length. Longer brackets hide revisits: if price spikes and comes back inside the same 30-minute bracket, those prices still show one letter. With 15-minute brackets the return may fall in a new bracket and add a second letter, so the same move can show fewer single prints. Know your setting.

What the data says

The popular use of single prints is as levels: “the singles get filled” or “the edge of the singles is support.” That was tested twice, on different data, and neither test found an edge.

Worked example: the rally that left no footprints

Illustrative NQ numbers. 12:00 ET (00:00 ICT, winter): the F bracket (12:00–12:30 ET) drives from 18,020 to 18,045 in 25 minutes, leaving single prints the whole way — one letter per price, no width. The G bracket opens at 18,044 and starts building width at 18,040–18,046: overlapping letters, time being spent, volume arriving.

Read, in two parts. The F-bracket singles say initiative: buyers were urgent and nobody negotiated with them on the way up. The G-bracket width says acceptance beginning: the auction came back and started doing the business it skipped at the top of the move — the upper part of the singles is being filled in. As long as G keeps building width above 18,040, the initiative is being ratified, and 18,040 is now a price where business has been done — a reference to watch on a pullback, not a level shown to hold.

Now the other branch: suppose G instead collapses straight back through 18,020–18,045 and trades below 18,020 within fifteen minutes. The initiative was not ratified: the auction went back to where it had been doing business. The trader who bought the F-bracket breakout with a stop “somewhere in the move” at 18,030 had no written reason for that price: nothing in the profile says business was done at 18,030, so a trade there says nothing new about the idea. A cleaner plan writes the invalidation where the read is wrong — for example, acceptance back below 18,020, under the original width — and sizes the position to that distance. Whether price crosses the zone fast or slow on the way back is the untested part; where the idea is wrong does not depend on it.

On a prop-firm account the stop is also your daily-loss arithmetic: size to the invalidation distance, not to the hope that the zone holds (PROP course).

Worked example 2: singles with heavy volume

Illustrative ES numbers. 10:00 ET (22:00 ICT, winter): a data release hits and the B bracket drops from 5,990 to 5,972 in twelve minutes. The TPO profile shows single prints from 5,973 to 5,988. But the volume profile shows a thick node at 5,976–5,980 — over 9,000 contracts traded there in about four minutes.

Read: the two profiles disagree, and both are right. In time, the auction hurried. In size, a lot of business was done at 5,976–5,980 during the hurry. Describe the zone as mixed: 5,981–5,988 is single prints with thin volume, while 5,976–5,980 is single prints sitting on a fat volume node, where many contracts did change hands. A trader who looked only at the letters would call the whole zone empty; a trader who checked volume would mark 5,976–5,980 as a price where business was done. Whether either part slows a later return is the same open question as for any node (M2.03): a reference to watch, not a forecast.

Common mistake: Treating a single-print spike as strength to chase — “it ripped 25 points, the buyers are in control, I’m buying.” Single prints show urgency, not agreement; a spike can come from short covering or a run of stops that is finished once those orders are filled. The question is never “how fast did it move?” but “did the auction come back and do business there?” Chase the singles without the fill-in, and you’re buying the exact airspace the market has not yet agreed on.

Common mistake: Reading “most single prints get revisited” as an edge. A nearby price gets revisited often whether or not it is special. In our lab’s test, single-print edges were touched about as often as random prices at the same distance. Always ask for the baseline (EV1.02) before you turn a revisit rate into a target.

Drill: score your own single prints

For the next ten sessions, mark every zone of three or more single-print rows left inside the day’s profile (not at the extremes). For each, also mark a placebo price: the same distance from the close, on the other side. Before you start, write down your rules: “filled” means a later bracket trades through the whole zone within the next three sessions; “held” means price touches the zone edge and moves back a set distance (for example 20 NQ points) before trading a smaller set distance (for example 10 points) through it. Log filled / held / neither for both sets.

What we don’t know yet

• Whether price crosses single-print zones faster than comparable prices on NQ: not yet measured (the LVN version is only a weak, uncorrected lean in one practitioner study).
• Whether singles built from 30-minute letters in NQ futures behave differently from the hourly-letter ETF zones our lab tested: the true 30-minute check covered about 59 sessions, too few to say.
• Whether old single prints and fresh breakout single prints behave differently, as some practitioners claim in opposite directions: not tested against a placebo.

Recap:

• Single prints = prices with one TPO: the auction passed through in a hurry without negotiating — initiative in TPO language, the LVN idea in time instead of volume.
• Urgency is not acceptance: singles that get filled in with overlapping brackets are ratified; singles that stay thin were an unratified probe.
• Singles at an extreme are tails; singles with heavy volume are mixed zones; bracket length changes how many singles you see.
• As levels, singles showed no edge: they were filled, touched and held about as often as comparable prices. Keep them on the watch-list, not as targets or floors.

Further reading:

• Market Profile (TPO) — ATAS help — single prints and bracket structure on the live TPO chart.
• James Dalton, Markets in Profile (Wiley, 2007) — initiative vs responsive activity and acceptance in the auction-market framework.
• Following the Auction: Market Profile Basic Language — reading letter structure, including thin prints, in plain English.
• Order Flow, Measured: All Claims — the public NQ practitioner study behind the single-print result (claims AP-07 and AP-09).
• Our lab: single-print edges, like the other TPO levels we tested, were touched and held about as often as random prices at the same distance over 721 sessions, and no TPO rule passed its holdout.

Prerequisites: M2.06 Market Profile structure, M2.07 Initial Balance · Next: M2.09 Poor highs & lows, which reads single prints at the day’s extreme as tails · Connects to: M2.03 (LVN — the volume-language twin), M2.06 (TPO letters), M2.11 (overnight single prints as morning references)

Educational content only — not financial advice. Futures trading involves substantial risk of loss.