
A trading halt occurs in the U.S. when a stock exchange stops trading on a specific security for a certain time period. The halt, which can happen a few times a day per security if FINRA deems it, usually lasts for one hour, but is not limited to that. Trading halts occur during the trading day (intraday), while a trading delay occurs at the begin...
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http://en.wikipedia.org/wiki/Trading_halt

When trading of a stock, bond, option or futures contract is stopped by an exchange while news is being broadcast about the security. See: Suspended trading.
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http://www.duke.edu/~charvey/Classes/wpg/bfglost.htm

Trading of a stock, bond, option or futures contract can be halted by an exchange while news is being broadcast about the security.
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http://www.encyclo.co.uk/local/20047

Maximizing a firm's revenues by purchasing stock in other firms in order to collect the maximum amou
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http://www.encyclo.co.uk/local/22402

The suspension of trading in a security while material news from the issuer is being disseminated. A trading halt generally lasts 30 minutes and gives all investors equal opportunity to evaluate news and make buy, sell, or hold decisions on that basis.
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http://www.exchange-handbook.co.uk/index.cfm?section=glossary&first_letter=

The suspension of trading in a Nasdaq security while material news from the issuer is being disseminated. A trading halt generally lasts 30 minutes and gives all investors equal opportunity to evaluate news and make buy, sell, or hold decisions on that basis. (See material news)
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https://www.encyclo.co.uk/local/21119

A trading halt is imposed by the exchange, usually due to the dissemination of news that might impact a stock's price.
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https://www.encyclo.co.uk/local/22800
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