Yesterday's problems followed a high profile breakdown in August, which resulted in a three-hour outage. The company said on that occasion the the failure had resulted from a glitch in software that publishes the prices of stocks listed on the exchange. This was followed by a far shorter shutdown in September.
Those embarrassments followed Nasdaq's agreeing to pay a
The exchange also agreed to refund
Some of the largest American companies, including Apple and Facebook, are listed on Nasdaq, while about 20% of the 500 largest companies traded on Wall Street - the so-called S&P 500 index - call Nasdaq their home.
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