Trading in a security can be temporarily halted by stock exchanges for a variety of reasons, including upcoming news announcement or there is uncertainty over whether the security continues to meet listing standards set by the exchange. The halt can last from a few minutes to longer periods, potentially extending across multiple trading days. When the primary listing exchange of a security issues a regulatory trading halt, all U.S. stock exchanges and other market centers that trade the security must also halt trading in the security. While the trading halt is in effect, all U.S. market participants are prohibited from trading the stock.
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