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NASDAQ halts stock trading, citing data-feed glitch

Apple, Microsoft shares affected by trading suspension

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Updated A technical problem halted Nasdaq securities trading on Thursday, putting stocks such as Apple and Microsoft into limbo.

The glitch was due to problems with the trading systems that disseminate pricing quotes, and led to a freeze in the trading of NASDAQ-backed securites at 12:14 Eastern Time.

In a statement, the Securities and Exchange Commission said it was monitoring the situation.

The trouble began at 11:45 ET when the exchange started reporting problems, but these intensfied. At the time of writing, trading was still unavailable, and no update had been made to the Nasdaq Market System Status page since 13:32 Eastern Time.

"From what we can tell there's not some intrinsic technology problem in the exchange mechanism itself but rather [with] the reporting," Mani Mahjouri, the chief investment officer of financial technology firm Tradeworx, told The Register.

The problem lay with the SIP – stock information processor – rather than fundamental exchange infrastructure, he said. "The SIP [is] a feed that reports near-realtime to the market all the trades that were happening, and they encountered a problem with the process delivering that information," Mahjouri said. ®

Update:

Trading shall resume on the exchange at 3:25pm Eastern Time, Nasdaq wrote in an update to its Market System Status page. "Customers who wish to cancel their orders may do so and any customer who wishes to not participate in the re-opening should cancel their orders prior to the resumption of trading."

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