Tech stocks appear to go nuts after computer glitch

Data box on left shows Apple up sharply

Apple, Amazon and Microsoft's share prices were all listed as exactly $123.47.

At other times, the market data reset shares in major corporations like Apple, Google, and Microsoft to $123.47 (109 euros) each.

Several US media outlets said Bloomberg terminals, along with the Google Finance and Yahoo Finance portals were affected by the glitch. It also indicated that Amazon had lost as much as $398bn in market capitalisation, while Bed Bath & Beyond saw its value lift from about $4.4bn to $17.9bn.

Nasdaq said the misleading prices came from test data it sent out that was "improperly" used by some third party companies.

The mistakes have prompted widespread concern among investors as third-party providers began spreading the test data as real.

The mistakes took place due to an error in the world's second-largest stock exchange Nasdaq's computers.

The prices were apparently test data mistakenly distributed by third parties which some vendors then used as live figures, according to The FT. At 6:30pm EDT, hours after the market closed early, some of the incorrect prices started to appear on financial websites. "UTP (Unlisted Trading Privileges) is asking all third parties to revert to Nasdaq Official Closing Prices effective at 5:16 PM". "This is now being fixed and we hope to update our stock price data shortly".

USA markets had closed early ahead of the holiday.

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