You are watching a stock jump 12% in two minutes, you reach for the sell button, and the quote freezes. The ticker now shows a halt. Trading in the stock has stopped, and you cannot buy or sell until it resumes.
Halts look alarming, but they follow clear rules. Knowing which kind of halt you are looking at tells you roughly how long it will last and what happens next.
What Is a Trading Halt?
A trading halt is a temporary stop in trading of one stock (or, rarely, the whole market). It is imposed by the listing exchange, by regulators, or by automated volatility rules. The goal is to give everyone time to absorb information or to stop a disorderly price move.
While a stock is halted, no trades execute on any US exchange. Quotes may still appear, but orders are not matched. Orders already in the book generally stay in place and can execute when trading resumes.
The Main Types of Trading Halts
| Halt type | Typical trigger | Typical length |
|---|---|---|
| News pending | Material news about to be released | Minutes to hours |
| Volatility pause (LULD) | Price outside its allowed band | 5 minutes |
| Additional information requested | Exchange wants a company disclosure | Hours to days |
| Regulatory or SEC suspension | Concerns about accuracy of public information | Up to 10 trading days |
| Market-wide circuit breaker | S&P 500 falls 7%, 13% or 20% | 15 minutes, or rest of day |
1. News-Pending Halts
When a company is about to release major news, such as a merger, an FDA decision or a surprise earnings pre-announcement, the exchange can halt the stock so that all investors receive the information at the same time. Halt-code lists label this "news pending" and later "news released." Trading usually resumes after a short period, often with a reopening auction that sets a fresh price.
2. Volatility Pauses (LULD)
The Limit Up-Limit Down (LULD) plan sets a price band around a stock's average trade price over the previous five minutes. The size of the band depends on the stock:
- Tier 1 (stocks in the S&P 500 and Russell 1000, plus certain ETPs): 5% band.
- Tier 2 (all other listed stocks priced at $3 or more): 10% band.
- Stocks under $3 use wider bands, the lesser of $0.15 or 75%.
- Bands double during the first 15 minutes and the last 25 minutes of the session, when prices naturally swing more.
If a stock hits the edge of its band and cannot trade back inside it within 15 seconds, trading pauses for five minutes. After the pause, the exchange reopens the stock with an auction.
Small, thinly traded stocks tend to hit their bands more often than large caps, because a modest amount of buying or selling can move their prices quickly.
3. Additional Information and Regulatory Halts
An exchange can halt a stock when it asks the company for more information, for example after unusual trading or a rumor it cannot verify. These can last much longer than news halts.
The SEC can also suspend trading for up to 10 trading days when it doubts the accuracy of public information about a company. A suspension is a serious flag. Stocks often reopen far lower, and some never regain their footing.
4. Market-Wide Circuit Breakers
When the S&P 500 drops 7% or 13% from the prior close before 3:25 p.m. ET, all trading halts for 15 minutes. A 20% drop halts trading for the rest of the day. The rules exist to stop panic cascades, and they have rarely been used. See our guide to stock market circuit breakers for the history.
What Happens When Trading Resumes?
Reopening is rarely a smooth restart. Exchanges typically run a reopening auction that collects buy and sell orders and sets one price at which the most shares can trade. Three things tend to follow:
- Gaps. The first price can sit well above or below the last price before the halt. A stop-loss order may fill far from its trigger.
- Wide spreads. The gap between bid and ask is often wider for the first few minutes.
- A second halt. If the news is large, volatility can push the price outside its band again and trigger another pause.
If you hold a position through a halt, the main risk is not that you cannot trade. It is that you cannot control the price you get when trading resumes. This is the same gap risk covered in our stop-loss order guide.
How to Check Why a Stock Was Halted
- Exchange halt pages. Nasdaq and NYSE publish current trading halts with a reason code and a time stamp.
- The company's filings. A news-pending halt is usually followed by a press release or an 8-K on SEC EDGAR.
- The stock's news feed. Check the headlines on the quote page for the same ticker.
Treat unconfirmed social posts as rumors until one of these sources backs them up.
Using Alerts to Stay Ahead of Halts
You cannot predict a halt, but you can see the conditions that produce them. Volatility pauses follow big, fast moves; news halts follow rumors and unusual volume. With Stock Alarm Pro you can:
- Set a price alert at a level well inside the LULD band, such as 3% above or below the current price for a large cap, so you hear about a fast move before it reaches the halt threshold.
- Set an unusual volume alert on stocks you hold or follow, since volume often spikes ahead of news.
- Watch earnings and catalyst dates so you know when a news-driven halt is most likely.
- Keep a stop-loss alert, not only a stop order, so you decide what to do about a gap rather than letting an automatic order fill at the reopening price.
Create a free price alert in Stock Alarm Pro and get notified the moment a stock moves, before the next halt.
Key Takeaways
- A trading halt is a temporary, rule-based stop in trading, not a verdict on the company.
- News-pending halts are the most common for company-specific events; LULD pauses last five minutes.
- The reopening price can differ sharply from the last price before the halt, so stop orders may fill poorly.
- SEC suspensions are different: they signal a regulatory concern and can last up to 10 trading days.
- Alerts set inside the LULD band give you time to act before a halt, not after.
This article is for educational purposes and is not investment advice.
