Slack also said that VC Chamath Palihapitiya will be stepping down from its board of directors.
Index Ventures partner Sarah Cannon joined Slack's board as an observer as the team was evaluating options for the company's public debut.
Slack insiders are set to reap some big paydays, now that the company is publicly-traded and worth over $20 billion.
Slack updated its S-1 on Monday to reveal a new ticker symbol from the one it originally filed to go public with.
Slack Chief Financial Officer Allen Shim gave a presentation to analysts on Monday ahead of the company's planned direct listing IPO.
Slack insiders are set to reap some big paydays when the workplace messaging company goes public.