The market is falling fast. Red candles everywhere. Then, suddenly, trading just… stops. Your brokerage app shows frozen prices. You can’t sell. You can’t buy. You can’t close the position you’re watching bleed in real time. For a few genuinely disorienting minutes, you have no idea what’s actually happening to your money.
This is the moment millions of people search “what happens to my trades during a circuit breaker” — almost always while it’s actively happening to them. And yet good, calm, beginner-level explanations of exactly what occurs to your specific open positions, pending orders, and account during a halt are surprisingly hard to find in the middle of a panic. This guide walks through exactly that: what a circuit breaker is, what triggers one, and — critically — what happens to your trades, your orders, and your money while one is in effect.
What a Circuit Breaker Actually Is
A circuit breaker is an automatic, rules-based trading halt that pauses some or all trading on an exchange when prices move by a large enough percentage in a short enough period of time. The purpose isn’t to prevent losses — it’s to interrupt panic, give the market a forced pause to “catch its breath,” and allow information to circulate before trading resumes, rather than letting a self-feeding spiral of fear-driven selling run completely unchecked.
Circuit breakers exist at two distinct levels, and understanding the difference between them matters enormously for figuring out what’s actually happening to your specific trade:
- Market-wide circuit breakers (MWCBs) halt trading across the entire market — every stock, every exchange — based on a decline in a major benchmark index.
- Single-stock circuit breakers, known in U.S. markets as the Limit Up-Limit Down (LULD) mechanism, pause trading in just one specific stock or ETF when its price moves too far, too fast, regardless of what the broader market is doing.
These two systems can trigger independently of each other. The overall market can be calm while a single stock you own gets halted because of a sudden, isolated price spike or drop. Or the broader market can be halted entirely while every individual stock, including ones that haven’t moved dramatically themselves, is swept into the pause along with everything else.
Market-Wide Circuit Breakers: The Exact Thresholds
In U.S. equity markets, a market-wide circuit breaker is tied to a single-day percentage decline in the S&P 500 Index, measured against the previous day’s closing price. There are three tiers:
- Level 1 — a 7% decline. If this is reached before 3:25 p.m. Eastern Time, trading halts across all U.S. equity and options exchanges for 15 minutes. If a 7% decline occurs at or after 3:25 p.m., no halt occurs at all — the market is simply allowed to keep trading into the close.
- Level 2 — a 13% decline. Same rule: triggers a 15-minute halt if reached before 3:25 p.m., but does not trigger a halt if reached after that time. Level 2 can only be triggered after Level 1 has already occurred earlier in the same session — the market has to pass through the thresholds in sequence.
- Level 3 — a 20% decline. This one is different: it triggers a halt for the remainder of the trading day, regardless of what time it occurs. Unlike Levels 1 and 2, there’s no “safe window” near the close — a 20% decline shuts trading down completely until the next session, no matter when it happens.
Only one Level 1 halt and one Level 2 halt can occur in a single trading day. These thresholds are recalculated every single morning based on the prior day’s closing price, so the exact point level that would trigger a halt is different from one day to the next, even though the percentages themselves stay fixed.
It’s worth noting just how rare some of these levels are in practice. Level 1 has been triggered a number of times historically, most memorably during a cluster of sessions in March 2020 at the start of the COVID-19 market crash. Level 2 has never been triggered since the current rules took effect in 2013 — not even during that same 2020 crash, when declines came close but didn’t cross the 13% line. Level 3 has never been triggered at all under the modern system. This context matters: a Level 1 halt, while attention-grabbing, represents the least severe tier of an already historically rare event.
What Happens to Your Open Positions During a Market-Wide Halt
This is the part that actually matters to you in the moment, so it’s worth being precise.
You cannot close, modify, or open any position during the halt itself. Once trading is paused, no new trades execute on the halted exchanges — meaning if you’re holding a stock and watching it fall, you cannot sell it during those 15 minutes (or, for a Level 3 halt, for the rest of the day). The position you’re holding simply sits, unchanged in terms of your ability to act on it, until trading resumes.
Your position’s value is still moving, even though you can’t trade it. A halt pauses trading, not the broader flow of information or sentiment — news continues, other related markets (like futures or international exchanges) may continue moving, and the eventual reopening price could be meaningfully different from the price at the moment the halt began.
Existing resting orders are generally not automatically canceled outright, but new order entry is restricted during the halt, and exchanges have specific rules about which previously placed orders remain valid, which can be modified, and which are canceled, depending on the order type and which exchange your position is listed on. Unexecuted market orders that were already on the book before the halt began are generally not canceled by the halt itself, but you typically cannot submit brand-new orders, including cancellation requests for certain order types, until trading mechanics resume.
When trading resumes, it doesn’t simply restart at the last traded price. Exchanges run a formal reopening auction, a structured process where buy and sell orders are collected and matched to establish a new opening price for each security, rather than simply picking back up exactly where the price left off. This means the price the moment trading resumes can gap meaningfully from the price at the moment the halt began, in either direction — the 15-minute pause gives the market time to digest the decline, and sentiment can shift during that window.
If a Level 3 halt occurs, your position stays exactly as it is until the next trading session. There is no reopening that day. Whatever you’re holding, you’re holding it overnight (or potentially over a weekend, depending on timing) with no ability to act until markets resume the next business day, at whatever price the market determines is appropriate at that point.
The Limit Up-Limit Down Mechanism: Single-Stock Pauses
Separate from the broad, market-wide system, individual stocks and ETFs have their own volatility circuit breaker called Limit Up-Limit Down (LULD), and this one is far more common in everyday trading than the headline-grabbing market-wide halts.
LULD works by establishing a price band around a stock — a percentage range above and below the average trading price over the preceding five minutes. If the stock’s price tries to move outside that band and stays outside it for 15 seconds without naturally moving back within range, trading in that single stock pauses for five minutes.
The exact percentage band depends on which “tier” the stock belongs to and its price level. Tier 1 stocks — which include everything in the S&P 500, the Russell 1000, and a number of major exchange-traded products — generally use a 5% band for stocks trading above $3, with wider bands (10%, 20%, or even larger) applying to lower-priced or less liquid securities, since smaller-dollar stocks naturally experience larger percentage swings on smaller absolute price moves.
If you’re holding a single stock that gets caught in an LULD pause, the experience is similar in kind to a market-wide halt but contained to just that one security: you cannot trade that specific stock for the five-minute pause, even though every other position in your portfolio continues trading completely normally. This is, in practice, the type of circuit breaker pause a typical retail trader is far more likely to actually encounter, since individual stocks experience sharp, isolated volatility — driven by an earnings surprise, a news headline, or a sudden imbalance of orders — far more often than the entire market triggers a Level 1 event.
What About Futures, Options, and Other Derivatives?
If you’re trading derivatives tied to halted securities or indexes, the relationship is direct: when a market-wide circuit breaker triggers in the underlying cash equity market, associated U.S. equity index futures and options — including major S&P 500 futures contracts — are halted simultaneously, in lockstep with the cash market halt. You cannot use futures or options as a workaround to exit or hedge a position while the underlying market-wide halt is in effect; the derivatives markets pause right along with it.
Futures markets also maintain their own additional volatility controls, separate from the cash-market-triggered halts, including dynamic, narrower price-limit mechanisms that can pause trading in a specific futures contract if it moves too far within a shorter window, even without a broader market-wide circuit breaker having been triggered at all.
Why Circuit Breakers Don’t Trigger on the Way Up
A detail that surprises a lot of beginners: circuit breakers in their market-wide form only trigger on declines, not on rapid gains. There’s no equivalent halt for a market that’s surging 7% or more in a single session. This isn’t an oversight — it reflects a deliberate regulatory judgment that sudden, severe downward moves carry systemic risk that sudden upward moves generally don’t, since panic-driven selling can spiral and overwhelm available liquidity in a way that euphoric buying typically doesn’t pose the same threat.
Does Pausing Trading Actually Help, or Does It Make Things Worse?
This is a genuinely debated question among market researchers, and it’s worth understanding both sides rather than assuming circuit breakers are an unambiguous calming mechanism.
The intended effect is straightforward: a forced pause gives panicked sellers a moment to stop, gives slower-moving information and analysis time to catch up to fast-moving price action, and theoretically allows trading to resume in a calmer, more rational state.
However, financial researchers have identified a countervailing effect, sometimes called the “magnet effect.” The theory holds that as prices approach a known circuit breaker threshold, some traders — fearing they’ll be unable to exit a position once a halt is triggered — accelerate their own selling specifically because the threshold is near, in order to get out before trading freezes. This behavior can, in theory, make the approach to a threshold more volatile and more abrupt than it would otherwise have been, precisely because the existence of the circuit breaker itself changes participant behavior as the market nears it. Whether this effect dominates in practice, versus the calming effect the system was designed to produce, remains a genuinely studied and debated question rather than a settled one.
What You Should Actually Do If You’re Caught in a Halt
Given everything above, here’s the practical, level-headed response if you find yourself holding a position during an active circuit breaker, whether market-wide or single-stock:
Accept that you cannot act until trading resumes, and stop trying to find a workaround. You cannot sell on a different exchange, switch to a derivative, or otherwise route around an active halt on a security you’re holding — the pause applies uniformly across the relevant markets.
Use the pause for what it’s actually designed for: information gathering, not panic. A 15-minute market-wide halt, or a 5-minute single-stock pause, is a genuinely useful window to read what’s actually driving the move, check whether it’s a broad macro event or something specific to a position you hold, and think clearly rather than react reflexively the moment trading reopens.
Expect the reopening price to potentially gap from where trading paused. Because reopening uses a formal auction process rather than simply resuming at the last traded price, don’t assume the price you saw right before the halt is the price you’ll see the moment it resumes.
Recognize that a Level 1 halt, while rare and dramatic-feeling, represents the least severe tier of an already historically uncommon event. It’s a meaningful signal that the market is under real stress, but it is, by design, the first and mildest circuit-breaker response available — not an indication that markets are permanently broken or that catastrophic, irreversible losses are guaranteed.
If you’re using significant leverage, understand that a halt does not pause margin calls or interest accrual on your account — your broker’s own risk management systems continue operating in the background even while exchange trading itself is paused, which is a meaningful distinction worth understanding well before you ever find yourself in this exact situation.
Avoid placing large, reactive orders the instant trading resumes. Volume and volatility are often elevated immediately after a halt lifts, as the backlog of orders from the pause period gets processed simultaneously; many experienced traders deliberately wait a short period after reopening before acting, rather than rushing in at the very first available moment.
Final Thoughts
A circuit breaker is, at its core, a deliberately blunt tool: when a market or a specific stock moves too far, too fast, trading simply stops for a defined period, with exact rules — 7%, 13%, 20% for the market as a whole; tighter percentage bands for individual stocks — governing exactly when and for how long. While it’s in effect, your open positions don’t disappear, your shares aren’t taken from you, and your account isn’t being secretly liquidated behind the scenes — you simply cannot act on that specific position until the pause lifts and a formal reopening process establishes a new price.
The most useful thing to internalize, especially in the moment it’s actually happening to you, is that a halt is a structural, rules-based pause designed to interrupt panic — not a sign that something has gone catastrophically and permanently wrong with the financial system, and not something a workaround exists for. Trading will resume, a new price will be established through a structured process, and the position you held before the halt will still be there, waiting for you to make a clear-headed decision about it, the moment that pause lifts.
