Is this a day-trading system? I have a full-time job.

The published version is, fully — the exit is the close of the same session, and the original demands market-hours attention. The daily-bar version in the product compresses the routine to minutes after the close, at the price of a one-bar delay and one overnight gap per trade. With a job, the daily version is the only realistic one, and its results are not the day-trade's results.

Do I need futures, or does an ETF work?

The arithmetic works on anything with a daily high, low and open. Futures are the native instrument because their costs per unit of exposure are lowest — which matters more here than anywhere — but a liquid index ETF is the right vehicle for the paper exercise, and for learning why the cost line dominates before any leverage is involved.

Why not just hold the winners overnight instead of selling at the close?

Then you are running a different system — one that swaps the day's follow-through edge for overnight gap risk, which is precisely what the design refuses. It may even test well in some markets, but it must be tested as its own strategy. Changing an exit rule because the winners 'look like they kept going' is how a tested system becomes an untested feeling.

Volatility Breakout (Larry Williams)Breakout7 min read

The volatility breakout explained from zero: how one morning number tries to read the day

The system explained without assuming you know what a range, a stop order or a day trade is — and an honest account of why a beginner should study it long before running it.

Key takeaway

Yesterday's range is a measure of how far the market normally wanders in a day; the trigger asks for half that wander, early, in one direction
The whole trade — entry price, risk, exit time — is known before the market opens, which removes in-the-moment judgement
It is one of the hardest systems in this library to run profitably, not because the rules are hard, but because the costs are

Who Larry Williams is, and why this formula carries his name

Larry Williams is one of the best-known short-term futures traders of the past half-century — a prolific author and researcher whose name is on a stack of indicators, and whose win in the 1987 Robbins world trading championship remains one of the most famous competition results in trading. His 1999 book Long-Term Secrets to Short-Term Trading collected decades of his pattern research, and the volatility breakout is its most durable idea.

The idea's appeal to a researcher like Williams is that it contains no chart-reading at all. No patterns, no trendlines, no judgement about what the market 'looks like' — just a claim about behaviour, testable on a century of data: days that move unusually far, unusually early, tend to finish in that direction.

A range is a market's stride length

Take any market and subtract yesterday's lowest price from its highest. That number — the range — is how far the market travelled top to bottom in one day. Think of it as yesterday's stride length. Some markets stride a fraction of a percent, some stride three; the same market strides differently in calm and in storm.

The stride gives you a yardstick for the word 'unusual'. A move of half a stride, on its own, means nothing — markets wander that far all the time over a whole day. But half a stride in one direction, early in the session, measured from where the day started? That is a day walking with purpose. Williams's system does exactly one thing: it computes what half a stride is each morning, and buys if the market covers it upward.

This is why the system needs no charts. 'Unusual strength' is usually a judgement call; here it is an arithmetic threshold, computed from two numbers before the market opens.

One trade's day, from bell to bell

Before the open: yesterday's high minus yesterday's low, times one half. Write it down.
At the open: add that number to the opening price. That sum is today's trigger.
Place a buy stop order at the trigger — an instruction to your broker to buy automatically the instant the price touches it.
If the market never reaches the trigger, nothing happens. No trade, no loss, no decision. Most days are this day.
If it triggers, you are long, with a stop order below in case the move collapses.
At the close, sell — whatever the result. The bet was about this day, and this day is over.

Notice how little of that list happens during market hours. The trigger, the orders and the exit time all exist before the first trade prints. Williams designed it that way deliberately: fast markets punish people who decide in real time, so the system moves every decision to the calm of the morning and leaves the session nothing to do but execute.

Why this is a system to study before it is a system to run

What makes it attractive

Rules a beginner can hold in one hand
No overnight risk — flat every evening
Feedback arrives in weeks, not years
Nothing to interpret, ever

What makes it hard

Costs eat a thin edge unless your access is cheap
Well under half the triggers finish as wins
Quiet months bleed slowly with perfect discipline
The published edge is decades old and crowded

The honest summary: this is one of the clearest teaching systems in the library and one of the hardest to actually make money with. It teaches how volatility is measured, why frequency multiplies everything, and what execution costs really are — lessons that transfer to every other system. Extracting a living from it, at retail costs, against modern competition, is another matter entirely, and nothing on these pages should suggest otherwise.

The useful next step

For one month, compute the trigger each morning for a single index ETF and write down whether the day touched it and where the day closed. No money, one number a day.
Count the month: how often it triggered, how the triggered days closed, and what a realistic commission and a tick of slippage would have done to the total.
Read the NR7 dossier next — it trades the same expansion-follows-contraction idea from the opposite door, waiting for a quiet bar instead of a fast morning.
If those numbers still look interesting, learn what a backtest with honest costs involves before risking anything — for this system, the cost line is the verdict.

Common questions

Is this a day-trading system? I have a full-time job.: The published version is, fully — the exit is the close of the same session, and the original demands market-hours attention. The daily-bar version in the product compresses the routine to minutes after the close, at the price of a one-bar delay and one overnight gap per trade. With a job, the daily version is the only realistic one, and its results are not the day-trade's results.
Do I need futures, or does an ETF work?: The arithmetic works on anything with a daily high, low and open. Futures are the native instrument because their costs per unit of exposure are lowest — which matters more here than anywhere — but a liquid index ETF is the right vehicle for the paper exercise, and for learning why the cost line dominates before any leverage is involved.
Why not just hold the winners overnight instead of selling at the close?: Then you are running a different system — one that swaps the day's follow-through edge for overnight gap risk, which is precisely what the design refuses. It may even test well in some markets, but it must be tested as its own strategy. Changing an exit rule because the winners 'look like they kept going' is how a tested system becomes an untested feeling.

The ideas behind it

This system assumes you already know these. Each one is explained from scratch in Investing 101.

These are documented methods described for study. Nothing here is investment advice, a recommendation, or a claim about future returns — every system on this page has losing periods, and the pages say where.

Reading about a system is not having one.

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