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04 July 2017 - Test data blamed for Nasdaq price errors
Nasdaq OMX
Source - https://www.finextra.com/newsarticle/30783/test-data-blamed-for-wild-swings-in-nasdaq-listed-stocks?utm_medium=dailynewsletter&utm_source=2017-7-5
Where - United States of America
Business line - Financial Exchanges

Test data supplied by third-party vendors interfered with Nasdaq stock prices during after-hours US trading on 3rd July.

Several stocks appeared to spike or plummet in price and a dozen Nasdaq-listed companies, including Google, Apple and Microsoft, were listed at the same incorrect price of US$123.47.

In a statement, Nasdaq said: “As part of its normal process, the UTP distributed test data and certain third parties improperly propagated the data. Nasdaq is working with third-party vendors to resolve the matter.”

The inaccurate data caused widespread confusion as the prices were listed on a number of financial websites including Google Finance, Yahoo Finance and the Bloomberg Terminal.

Nasdaq confirmed that no trades were actually completed at the incorrect prices listed.