A bizarre computer glitch led to the stock prices of several US technology companies including Amazon and Google to be dramatically undervalued this morning, leading to some losing billions in value.
The glitch was seemingly triggered after financial information providers wrongly read Nasdaq data tests as live prices.
Nasdaq-listed stocks appeared on some websites to either spike or plummet well after the closing bell on Monday.
Apple Inc shares appeared to more than double as a result of the glitch.
Microsoft shares jumped almost 80 per cent to a valuation of more than $1 trillion (£773 billion).
Nasdaq is investigating the improper use of test data distributed by the UTP.