A temporary suspension in the trading of a particular security on one or more exchanges, usually in anticipation of a news announcement or to correct an order imbalance. A trading halt may also be imposed for purely regulatory reasons. During a trading halt, open orders may be canceled and options may be exercised.
Taobiz explains Trading Halt
A trading halt gives all investors equal opportunity to evaluate news and make buy, sell or hold decisions on that basis. The stock exchange can also halt a stock at any time if it suspects unusual activity related to a stock's price. The stock will typically resume trading after 30 minutes, once news from the issuing company has been disseminated.
