Incorrect data shows Amazon, Apple stocks crashing

Screenshots from Google and Yahoo Finance

The prices of several big-name Nasdaq-listed stocks appeared on some websites to either spike or plummet well after the closing bell on Monday. The unusual numbers didn't have any effect on actual trades in the stocks, Nasdaq spokesman Ryan Wells confirmed.

It should also be noted that the Nasdaq's own website didn't reflect the $123.47 share prices, which confirms that this was simply a case of third-parties reacting to test data, which is often disseminated on a daily basis.

Stock prices of Amazon, Microsoft, according to the numbers on screen, had lost more than half of their values. Google parent Alphabet and eBay shares were among others that all appeared to be priced at US$123.47 on some financial news websites on Monday.

The swings came on a day that the US stock market closed early at 1 p.m., on the eve of the July 4 holiday. The test data originated from Nasdaq's Unlisted Trading Privileges (UTP) service.

The price for the affected stocks was set at $123.47 during the incident.

Nasdaq, the American stock exchange responsible for the chaos, is now looking into precisely what went wrong during the after-trading hours on Independence Day.

In a statement to the Financial Times, Nasdaq explained that the whole issue stemmed from "improper use of test data" that third-party financial data providers picked up.

Traders may have been left with sweaty palms as stock prices of some of the biggest tech companies in the world appeared to crash overnight.

In 2013, the exchange halted all trading in its listed stocks for about three hours because of a fault with the feed. Nasdaq is working with UTP and third parties to resolve the matter.

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