Why Slack Stock Just Surged 17%

Slack (NYSE: WORK) stock is soaring -- up 17.3% as of 12:15 p.m. EST on news that the workplace messaging app has signed up International Business Machines (NYSE: IBM) and its 350,000 employees to use the service for their internal communications.  

Business Insider broke the story this morning, calling this Slack's "biggest customer deal ever."  

Image source: Getty Images.

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Source Fool.com