Slack Pitches Potential Investors on a Few Big-Spending Customers

  • Messaging platform provider files plan to go public this year
  • Some 575 clients account for 40 percent of company’s revenue
A menu in the chat service app SlackPhotographer: Chris Ratcliffe/Bloomberg
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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 $100,000 a year for their employees to use its workplace-messaging product.

The San Francisco-based company, in its U.S. Securities and Exchange Commission filing Friday for an unusual direct listing, emphasized that it has been pushing further into the realm of big enterprise customers. Slack’s premise is that once a company starts using its services, its workers will enjoy using the platform so much that the employer will have to buy more over time.