Apparently, somebody didn’t get the memo. On the afternoon of July 3, the Nasdaq stock exchange closed three hours early in advance of the Independence Day holiday.

At that time, Nasdaq—in a test that had been announced to its data partners a week before—pushed out some manufactured stock quote data as part of a test of its systems. However, some of that data was apparently published inadvertently by multiple financial websites, including Google and Bloomberg.
The data errantly published was sent as part of a test of Nasdaq’s UTP (“unlisted trading privileges”) Quotation Data Feed, which serves up quotation data to a collection of market data vendors. “As part of its normal process, Nasdaq distributed test data and certain third parties improperly propagated the data,” a Nasdaq spokesperson told Ars via e-mail. “Nasdaq is working with these third party vendors to resolve the matter.”
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