Apple (AAPL) - Get Report shares rose 348% to $645.71 in late trading Monday, according to dubious data appearing on Yahoo Finance. Data problems also apparently affected Google Finance.

Among other highly suspicious stock quotes, Microsoft (MSFT) - Get Report was down 57% to $29.30 and Amazon (AMZN) - Get Report , down 75% to $247.53.

In some cases, the quotes appeared to be accurate, but the data in stock charts appeared to be compromised.

Google Finance showed Apple down 14.3% to $123.47.

Emails to Google and Yahoo PR departments were not immediately answered. The problem may have been triggered by a data glitch.

Said a Nasdaq spokesman via email to TheStreet, "As part of its normal process, the UTP distributed test data and certain third parties improperly propagated the data. Nasdaq is working third party vendors to resolve the matter."

The wild price swings recall the flash crashes of 2015 and 2010 when U.S. markets abruptly slumped only to rebound minutes later, as trading algorithms went haywire.

At $645.71 a share, Apple's market capitalization would be roughly $3.37 trillion.

Apple is a holding in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. Want to be alerted before Cramer buys or sells AAPL? Learn more now.

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