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Nasdaq halts trades due to technical difficulties

Thursday, August 22, 2013 | 12:07 p.m. CDT; updated 8:05 p.m. CDT, Thursday, August 22, 2013

NEW YORK — Nasdaq halted trading Thursday because of a technical problem, the latest glitch to affect the stock market.

The exchange sent out an alert to traders at 11:14 p.m. saying that trading was being halted until further notice because of problems with a quote dissemination system. More than an hour later, trading was still halted.

The glitch was the latest incident to raise questions about the dangers of trading via machine, following a sudden plunge in stocks in May 2010 that came to be known as the "flash crash" and the glitch-plagued initial public offering of Facebook last year.

Nasdaq said it wouldn't be canceling any open orders, but that customers could cancel orders if they wanted to.

Nasdaq sent out an update at noon saying trading would reopen "at a time to be determined."

The Nasdaq composite index was frozen at 3,631.17 when trading stopped Thursday. The index was up 31.38 for the day and up 20 percent so far this year.

"We are monitoring the situation and are in close contact with the exchanges," said Securities and Exchange Commission spokesman John Nester.

The days of stock brokers in colorful jackets, roaming the floor of the stock exchange, are fading. Now, powerful computer programs dominate trading by sifting through reams of data and executing trades in fractions of a second. That makes trading faster and, arguably, more efficient. But it also introduces more possibilities for errors that can jolt the entire market.


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