Nasdaq has not fixed all its technical glitches.
Starting at 11:35 a.m. on Wednesday, investors were unable to see quotes in certain Nasdaq stocks for six minutes. The exchange said the cause was a brief outage in its system that disseminates stock quotes, or the prices investors are willing to pay to buy or sell stocks.
The trouble came just two weeks after Nasdaq halted trading in its stocks, including Apple, Google, Microsoft, Intel and Facebook, for more than three hours because of problems with its server that disseminates quotes for stock prices.
In a statement, Nasdaq said that “trading was not affected” and that quotes were once again disseminating normally. Nasdaq attributed the outage to a failure of its “back end server.”
NYSE Arca noted a longer duration for the outage than Nasdaq. It said its customers did not receive public quotes from Nasdaq’s server between 11:35:09 a.m. and 11:44:32 a.m.
Another exchange, Direct Edge, said it actually halted trading in affected stocks from 11:43 a.m. to 11:48 a.m.
The outage, though brief, raises additional questions again about the safety and security of Nasdaq’s trading systems.
Wednesday’s outage and the recent three-hour delay were caused by problems with Nasdaq’s central clearinghouse for quotes known as the “UTP SIP.” That’s the security information process where 13 public exchanges send bid and offer prices on Nasdaq-listed stocks.
Nasdaq infamously botched the debut of Facebook in May 2012.
