MATTHEW BOESLER
Business Insider

  • nasdaqNasdaq

NASDAQ index flatlines after the exchange halts trading Thursday afternoon.

The NASDAQ has been down for more than three hours this afternoon due to a technical issue with the system that disseminates quotes for NASDAQ-listed stocks to other exchanges that also trade those stocks.

Every NASDAQ-listed stock – Apple, Facebook, Microsoft, etc. – was halted. As a result, both the index and individual stocks flatlined.

The exchange just reopened for trading at 3:25 PM ET, and shares of all three of those companies are rising, as is the broader index.

Upon opening, NASDAQ declared “self help” against NYSE Arca, a signal that orders should be rerouted to other exchanges.

NASDAQ said the trading halt was due to a UTP SIP quote dissemination issue.

(UTP stands for “unlisted trading privileges” and refers to the ability of other exchanges to trade securities listed on the NASDAQ. SIP stands for “securities information processor” and is the system that allows NASDAQ to send quotes for those securities to other exchanges.)