Trading halts: live US stock halts, LULD pauses and reason codes
How the Quantisnow /halts page works: stocks halted now, halts from the last 7 days, long-term halts, halt prices and resumption times, and what each Nasdaq halt reason code means.
Key takeaways
- The Quantisnow trading halts page at /halts lists US stocks halted right now, halts from the last 7 days that have resumed, and long-term halts older than two weeks.
- Halt data comes from the Nasdaq Trader trade halts feed, checked every minute during market hours, and all times are shown in US Eastern time.
- Each halt shows the ticker, company, listing market, reason code in plain English, halt time, halt price, expected or actual resumption time and duration.
- A limit up / limit down pause (LUDP) is the most common halt and usually lasts five minutes, while regulatory halts such as H10, H11 and T12 can last days or longer.
The trading halts page at /halts shows which US stocks are halted or paused right now, why, and when they are expected to resume. It is free and needs no account.
What the page shows
The page has three lists:
| List | What it contains |
|---|---|
| Halted now | Halts with no resumption time yet, or a resumption time still in the future, that started within the last two weeks |
| Recent halts | Halts and pauses from the last 7 days that have since resumed |
| Long-term halts | Securities halted for more than two weeks with no resumption, typically pending SEC action, delinquent filings or a delisting |
Each row has these columns:
| Column | Meaning |
|---|---|
| Ticker | Links to the company page when Quantisnow covers the company |
| Company | Issue name, with the listing market below it |
| Reason | The halt reason code and a plain-English label; hover for a full explanation |
| Halted | Halt time in US Eastern time |
| Halt price | The pause threshold price, when the exchange reports one |
| Expected resume / Resumed | For active halts, the announced resumption trade time (and quote time if different), or Not announced. For past halts, when trading resumed |
| Halted for / Duration | How long the halt has lasted, or lasted in total |
Data source and refresh
Halts come from the Nasdaq Trader trade halts feed. Quantisnow checks the feed every minute from early morning to early evening ET on weekdays, and every 15 minutes at other times. The page itself refreshes at most once a minute. Times are shown in US Eastern time.
A halt drops out of Halted now once the feed reports a resumption time that has passed. If a halt disappears from the feed without a resumption time, Quantisnow stops treating it as active after 3 days, so a missed resumption never leaves a ticker stuck as halted.
Halt reason codes
The most common codes, as explained at the bottom of the page:
| Code | Label | What it means |
|---|---|---|
| T1 | News pending | The company is about to release material news; trading stops so everyone gets it at the same time |
| T2 | News released | The news is out; trading stays halted briefly while it spreads |
| T3 | News and resumption times | The exchange has set the times quoting and trading will resume |
| T12 | More information requested | The exchange has asked the company for more information before trading can resume |
| LUDP | Volatility pause | Limit up / limit down pause: the price moved outside its band, so trading paused for at least five minutes |
| LUDS | Volatility pause (straddle) | Quotes sat on both sides of the price band, so trading paused |
| M | Volatility pause | Volatility trading pause in a security listed on another exchange |
| H4 | Non-compliance | The company is not meeting listing requirements |
| H9 | Not current in filings | The company is behind on required SEC filings |
| H10 | SEC trading suspension | The SEC has suspended trading, typically for up to ten days |
| H11 | Regulatory concern | Halted over a regulatory concern, often during an exchange or SEC review |
| D | Security deleted | Removed from Nasdaq or the consolidated quote system, for example after a delisting or merger closing |
| IPO1 | IPO not yet trading | A new listing that has not opened for trading yet |
| MWC1 | Market-wide circuit breaker, level 1 | The S&P 500 fell 7%, halting all US stocks for 15 minutes |
The page also decodes less common codes, including T5, T6, T7, T8, O1, M1, M2, IPOQ, IPOE, MWC2, MWC3, MWC0 and resumption codes such as R4, R9, C3 and MWCQ. Codes Nasdaq Trader does not document are shown as Halt code followed by the code.
Glossary: trading halt, LULD, circuit breaker, delisting and Nasdaq.
Halts on company pages
When a covered company is halted, its company page shows a Halted badge next to the ticker. Hover it to see the reason; click it to open /halts.
How to use halts with the news
A news halt (T1) usually comes right before an announcement. Open the company page or the live news feed to catch the release as it crosses the wire, and follow the ticker for alerts. See Following tickers. Volatility pauses often show up on the day's biggest movers.
FAQ
Where does Quantisnow get trading halt data?
From the Nasdaq Trader trade halts feed, which Quantisnow checks every minute during market hours on weekdays.
How long does a trading halt last?
It depends on the reason. A limit up / limit down pause usually lasts five minutes, news halts (T1, T2, T3) resume once the market has had time to digest the news, and regulatory halts (H10, H11, T12) can last days or longer.
What does halt code LUDP mean?
LUDP is a limit up / limit down pause. The stock's price moved outside its allowed band, so trading paused for at least five minutes.
What is a long-term halt?
On /halts, a long-term halt is a security halted for more than two weeks without resuming, typically pending SEC action, delinquent filings or a delisting.
What time zone are halt times in?
All halt and resumption times on /halts are shown in US Eastern time.