Trading Halt

A trading halt is a temporary suspension of all trading in a stock's shares on U.S. exchanges. During a halt, no buy or sell orders are executed — existing orders are not filled and new orders are queued but not processed. Halts can last from minutes to days, depending on the reason. For active traders, halts represent some of the most significant risk events in intraday trading: a stock can be halted mid-move, preventing exits, and can reopen at a substantially different price.

Types of Trading Halts

LULD Halt (Limit Up-Limit Down). The most common type. Automatically triggered by NASDAQ/NYSE circuit breakers when a stock's price moves too rapidly in either direction: specifically, when the price moves more than a defined percentage (5–20% depending on price tier) within a 5-minute rolling window. LULD halts last 5 minutes before trading resumes. High-volatility catalyst events frequently trigger LULD halts in the first minutes of trading.

News Pending Halt. Initiated by the exchange at a company's request to allow orderly dissemination of a material announcement before the market reacts. The company contacts the exchange, requests a halt, then releases the news. Trading resumes after a defined period following the news dissemination. The moment news-pending halts resume trading is one of the most volatile and opportunity-rich periods in catalyst trading.

Regulatory Halt (T12). Initiated by FINRA or the SEC due to concerns about trading activity, suspected manipulation, or missing financial disclosures. These halts can last days or weeks and are typically bearish signals for the affected stock.

Trading Around Halts

Traders monitoring catalyst events must be prepared for halt risk on high-volatility stocks. LULD halts are recoverable — trading typically resumes at a price close to where the halt was triggered. Regulatory halts represent a more serious risk. News-pending halt resumes are often the largest single price discovery events for a given stock. TradeAI News flags halt events in real time through the catalyst classification system, enabling traders to prepare for post-halt price discovery.