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Slack confidentially files to go public

Photo of Slack CEO Stewart Butterfield speaking on conference stage.
Slack CEO Stewart Butterfield at the 2015 Web Summit. Photo: Clodagh Kilcoyne/Getty Images

Slack has confidentially filed documents to go public with the U.S. Securities and Exchange Commission, the company announced on Monday.

Why it matters: Slack has been rumored to be considering a direct listing instead of a traditional IPO. Should the workplace messaging behemoth choose that path, it will be the second tech company to do so after Spotify did so last year.