If Slack follows Spotify with a direct listing, it could upturn IPOs Business InsiderSlack Plans to Follow Spotify on Unconventional IPO Route The Wall Street JournalSlack is reportedly following Spotify in going public through a direct listing. Here's how a direct listi.. Business InsiderDirect Listings Are a Thing Now BloombergSlack 'seriously' considering direct market listing: source ReutersView full coverage on Google News