Trading Halts, Price Bands and What Reaches Your Account

A stock stops trading. The headline says limit down, and every explanation of what that means is written for someone who owns the share on the exchange where it stopped.

Most people reading those explanations do not own the share. They hold a derivative referencing it, or they hold a currency, and the protection being described may not reach them at all. That is the question worth settling first, and it has a short answer.

Which Venue Governs What You Actually Hold

One question settles almost everything else, and it is not what instrument you trade. It is which venue sets the price you are being filled at.

A share bought on a US exchange sits inside a national market system plan, and that plan applies bands to it directly. A futures contract sits under its own exchange’s rules, which are different again.

A position opened with a broker against one of those, rather than on the venue itself, is governed by neither. It references a price the venue produces, and what your broker does when that price stops arriving is a matter of your agreement with the broker. The same split decides what reaches a position on a scheduled expiration date rather than an emergency halt. That bilateral structure is what a contract for difference actually is.

The distinction is not academic. It decides whether a mechanism designed to stop you being filled at an absurd price is protecting you, is irrelevant to you, or is the reason you cannot get out.

If you are unsure which row you are in, the deciding fact is whether the contract is traded on an exchange or agreed bilaterally with a firm, and the difference between an exchange contract and a spot position is where that line is drawn.

How a Price Band Is Set, Minute by Minute

The common description of a price band is a fixed percentage away from the previous close. That is not how the US equity bands work, and the difference matters when you are trying to judge how far a price can still run.

The plan calculates an upper and a lower band around a reference price, and that reference price is an average of the qualifying trades reported in the previous five minutes. It moves with the market rather than sitting still at yesterday’s number.

Two refinements decide how quickly it follows. The reference price is refreshed after 30 seconds only if the new figure would sit at least one percent away from the current one, and if no eligible trade happened in the previous five minutes the earlier reference price simply stays in force.

The percentage applied to it depends on the security’s tier and its price. Tier 1 covers selected exchange traded products together with the constituents of the Russell 1000 and of the S&P 500; Tier 2 covers the other national market system securities, with rights and warrants excluded from the plan entirely.

For Tier 1 names and for Tier 2 names under three dollars, the parameter is five percent above three dollars, twenty percent between seventy-five cents and three dollars, and the lesser of fifteen cents or seventy-five percent below that. Tier 2 securities above three dollars use ten percent. The band is the reference price plus or minus that proportion of itself, rounded to the nearest penny.

The Hours the Band Does Not Cover

The plan operates during regular trading hours only, from 9:30 to 16:00 Eastern. Outside that window it is not in force, which is the single most useful thing on this page for anyone trading from another timezone.

There is also a deliberate loosening at the end of the session. In the final 25 minutes of the regular day the bands double in width, and that applies to every Tier 1 name as well as to the cheaper Tier 2 ones under three dollars.

So the protection is neither constant nor symmetrical across the session. It is absent before the open, absent after the close, and at its widest during the closing stretch when volume and volatility are usually at their highest.

What Locked Means for a Position You Already Hold

A band does not freeze a price. It prevents trades printing outside the band, which is a different thing and has a different consequence for someone already in a position.

When the market can only quote at the edge of the band, one side of your intentions stops being available. You may still be able to transact in the direction that moves price back inside, and not in the direction that would push it further out.

That asymmetry is the part worth planning for. A position moving against you is precisely the one you want to close, and it is precisely the one the band is standing in the way of.

A resting stop is not an exception. An order cannot be filled at a price the venue will not print, so a stop sitting outside the band waits, and what it eventually gets is whatever the market offers when trading resumes. The same holds at the scheduled auctions that open and close an equity day, where no price prints until the book uncrosses.

That is a gap, and how a gap turns into slippage is the same mechanism in another setting. Which price your stop watches for in the first place is settled by which price triggers a stop on your platform.

Market-Wide Circuit Breakers Are a Different Mechanism

The two get conflated constantly, and they answer different questions. A price band is about one security behaving strangely. A market-wide circuit breaker is about the whole market falling.

The trigger is a single-day decline in the S&P 500 measured against the prior day’s closing price, and there are three thresholds: seven percent at Level 1, thirteen percent at Level 2, and twenty percent at Level 3. The exchange rulebooks set out what each level does, and the arrangement is coordinated across the equity and options markets rather than being one venue’s decision.

The practical difference for a position holder is scope. A band affects the one name you are in; a market-wide halt stops everything at once, which means the correlated hedge you were relying on is halted alongside the thing it was hedging.

Spot Currency Has No Halt and No Band at All

Everything above describes exchange machinery. Spot currency has no exchange, so none of it exists there.

There is no national market system plan for a currency pair, no reference price computed by a central processor, no tier, no band and no venue with the authority to stop trading. Prices come from a set of institutions quoting independently, and no one of them can halt the others.

What replaces the mechanism is discretion. In a violent move the observable effects are wider spreads, rejected orders and fills far from the screen price, produced by individual firms deciding what they will quote rather than by a rule that applies to everyone. What stands in for a circuit breaker in that market is the acceptance window a liquidity provider applies to your order.

This absence is also why a spot market can move a long way with nothing interrupting it, and why the visible order book question is separate again: why spot forex has no consolidated order book is a question about what you can see, not about what can stop you.

The Review Right That Comes With a Deadline

One thing survives a chaotic session and almost nobody writing about halts mentions it. An execution can be challenged as clearly erroneous, and the challenge is time limited.

On the NYSE group markets a member who thinks a fill it received was erroneous can ask for that trade to be reviewed, and the request has to reach the exchange within 30 minutes of the execution. Non-customer orders on NYSE American Options and NYSE Arca Options get 15 minutes instead.

The exchange then determines whether the execution was clearly erroneous under its rules. The point for anyone reading a statement after a disorderly open is simply that the clock is short, and noticing something odd the next morning is already too late.

Who This Page Is Not For

A trader whose account holds nothing but spot currency pairs will never meet these mechanisms at all. The section above explains why, and that is the whole answer.

If you want to know what your particular broker does when an underlying is halted, that is not a question with a general answer. It is set out in your own account terms, and it varies by firm and by regulated entity.

And if you are looking for a way to profit from halts, this is not that page. Nothing here is a strategy, and a halted market is a market you cannot act in.

Frequently Asked Questions

Does a limit up limit down band apply to my CFD?

Not directly. The bands apply to the security on the exchange, not to a contract you hold with a broker against it. What happens to your position when the underlying stops trading is governed by your broker’s terms rather than by the plan.

Is there a circuit breaker in forex?

Not in spot currency. There is no exchange and no market-wide plan, so no venue can halt it. Exchange-traded currency futures are a different case and follow the rules of the exchange that lists them.

What happens to my stop loss when a stock is halted?

It cannot be filled at a price the venue will not print, so it waits. When trading resumes the fill reflects the price available at that moment, which can be far from the level you set.

How is the limit up limit down price band calculated?

A percentage is applied to a reference price, and that reference price is the average of eligible reported trades over the previous five minutes. The percentage depends on the security’s tier and its price, and the band is the reference price plus or minus that amount.

Are limit up limit down bands active outside US market hours?

No. The plan applies during regular trading hours, 9:30 to 16:00 Eastern. Outside that window there is no band, and for Tier 1 securities the bands are doubled during the final 25 minutes of the session.