Circuit Breaker and Trading HaltLULD
A trading halt is a temporary stop in trading. Circuit breakers trigger halts automatically after large moves: in the US, market-wide halts apply if the S&P 500 falls 7%, 13% or 20% in a day, and limit up–limit down price bands pause individual stocks that move too far too fast.
When prices fall too fast, markets can pause. Circuit breakers are automatic rules that halt trading after extreme moves, giving participants time to absorb information instead of selling into a vacuum. In the US there are two main layers: market-wide halts based on the S&P 500, and limit up–limit down bands for individual stocks. This entry explains how they work, what happens to your orders, and why halts matter for risk.
- Category
- Market Structure
- Reading time
- 4 min
- Also called
- Trading halt, Circuit breakers, Limit up limit down
- Updated
Circuit breakers in plain words
If the S&P 500 falls sharply in one day, US markets can halt trading for everyone. The thresholds are declines of 7% (Level 1), 13% (Level 2) and 20% (Level 3).1 See Volatility.
Individual stocks have their own guard rails: limit up–limit down bands stop trades from happening outside a price band around the recent average price, and a stock that stays outside the band can be paused for five minutes.1
How the US rules work, step by step
Reference level
Market-wide thresholds are set each day from the prior close of the S&P 500.1
Level 1 or 2
A 7% or 13% drop before 3:25 p.m. halts trading for 15 minutes; at or after 3:25 p.m. it does not halt trading.
Level 3
A 20% drop halts trading for the rest of the day.
Single stocks
Price bands of 5%, 10% or 20% (wider for very low-priced stocks), doubled near the open and close.
Pause
If a stock does not return inside its band within 15 seconds, trading pauses for five minutes.
Outside regular hours
Some volatility protections may be limited or unavailable in extended-hours trading.2 See Market Hours.
Worked examples
Example 1 — A Level 1 halt
Level 1The S&P 500 closed at 5,000 yesterday. At 11:00 a.m. it trades at 4,650.
| Decline | 350 ÷ 5,000 = 7% |
| Result | Market-wide halt for 15 minutes |
The pause gives the market time to absorb news before trading resumes.
Example 2 — A single-stock pause
LULDA $40 stock with a 5% band jumps to $43 in seconds on a news headline and stays there.
| Band (approx.) | $38–$42 |
| Result | Five-minute trading pause |
Pauses can freeze a position — you cannot exit until trading resumes.
Example 3 — Stops during a halt
Gap riskA trader has a stop at $36 on a stock that is halted at $38 and reopens at $33.
| Stop | $36 |
| Likely fill | Near $33 |
A halt behaves like a gap: stops trigger at the first price after the reopening. See Price Gap and Stop Loss.
Types of halts
| Aspect | Trigger | Effect |
|---|---|---|
| Market-wide circuit breaker | S&P 500 down 7%, 13% or 20% | All stocks halted (15 minutes or rest of day) |
| Limit up–limit down | Stock outside its price band | Five-minute pause in that stock |
| News halt | Pending significant company news | Halt until the news is out |
| Regulatory halt | Concerns about the stock or its information | Halt set by the regulator or exchange |
Why traders need to know this
Exit risk
You cannot trade during a halt. See Liquidity.
Stop placement
Halts can produce gap-like fills.
Position sizing
Volatile names are halted more often. See Position Sizing.
Crisis awareness
Market-wide halts signal extreme stress. See Bear Market.
Advantages and disadvantages
Advantages
- Slows panic and gives time for information to spread.
- Reduces erroneous trades in fast markets.
- Rules are published and predictable.
Disadvantages
- You cannot exit during a halt.
- Reopening prices can gap far from the halt price.
- Rules differ by country and asset class.
- Some protections are limited outside regular hours.
Going deeper
Read as far as you need. Each level builds on the one before it.
Halts are temporary
Beginner
Most halts last minutes. Trading resumes, often after a reopening auction.
Crypto has no circuit breakers
Intermediate
Most crypto markets trade continuously without market-wide halts, so extreme moves can run unchecked. See Stablecoin.
Futures limits
Advanced
Futures exchanges also use price limits and halts, coordinated with stock-market circuit breakers during severe declines. See Futures Contract.
Common mistakes
Assuming you can always exit
Halts block trading.
Trusting stops through halts
Reopenings behave like gaps.
Chasing a reopening
Prices can swing sharply after a pause.
Assuming the same rules everywhere
Check your market’s rules.
Check your understanding
Test yourself before moving on. Each answer comes with an explanation.
Key points to remember
- Circuit breakers halt trading after extreme moves.
- US market-wide levels: 7%, 13% and 20% S&P 500 declines.
- Limit up–limit down bands pause individual stocks.
- You cannot trade during a halt; reopenings can gap.
- Rules differ by market and country.
Frequently asked questions
How often do market-wide circuit breakers trigger?
What happens to my open orders during a halt?
Do other countries have circuit breakers?
Further learning
- Price Gap
What reopenings after halts look like.
- Volatility
The conditions that trigger halts.
- Exchange
Where halt rules are applied.
- Stop Loss
Why stops do not protect through halts.
Sources
This article is written in our own words. The sources below support the specific facts, rules and figures marked with a number in the text. Links open the original publisher’s page.
- U.S. Securities and Exchange Commission. Investor Bulletin: New Measures to Address Market Volatility (opens in a new tab) Checked .
- Investor.gov (SEC). Extended-Hours Trading: Investor Bulletin (opens in a new tab) Checked .
Educational content, not financial advice. Examples use hypothetical prices and simplified costs; actual fees, margin rules and regulations vary by broker, market and country. We are not affiliated with any publisher linked above. Last reviewed . Report an error or request a source credit.