Slack Revenue Up 67% as Messaging Company Readies Stock Listing

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

Slack lost $31.9 million in the three months ended April 30, up 28% from the year prior, according to its revised filing Friday with the Securities and Exchange Commission. Slack’s revenue meanwhile grew by 67% to $134.8 million, according to the filing.

That’s a far cry from some of the technology unicorns that have gone public this year in a wave of initial public offerings. On Thursday, Uber Technologies Inc., whose $8.1 billion IPO is the ...