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 Pitches Potential Investors on a Few Big-Spending Customers

(Bloomberg) -- Slack Technologies Inc. may have more than 10 million daily users, but it wants potential investors to focus on a tiny sliver of its customers: the 575 businesses that pay more than ...