The icon for the chat service app Slack, by Slack Technologies Inc., sits on the screen of an Apple Inc. iPhone 6 smartphone in this arranged photograph in London, U.K. (Photographer: Chris Ratcliffe/Bloomberg)

Slack Revenue Up 67% as It Prepares Stock Listing

(Bloomberg) -- Slack Technologies Inc. released its first quarter financial results showing steady growth and manageable losses as it prepares to go public on June 20.