A mysterious technical glitch halted trading on the Nasdaq for three hours Thursday in the latest major electronic breakdown on Wall Street, embarrassing the stock exchange that hosts the biggest names in technology, including Apple, Microsoft, and Google.
The problem sent brokers racing to figure out what went wrong and raised new questions about the pitfalls of the electronic trading systems that have come to dominate the nation’s stock markets.
Nasdaq said only that the problem lay in its system for disseminating prices. An investigation was underway.
The outage disrupted what had otherwise been a quiet summer day on Wall Street. It was another in a series of technical problems to disrupt financial markets, though less alarming than the ‘‘flash crash’’ that set off a stock-market plunge in May 2010.