Slack non-IPO: 3 ways to decide whether the shares are worth buying By: MarketWatch June 06, 2019 at 13:35 PM EDT Slack is going public with a direct listing, so there’s no order-taking and final IPO price. Read More >> Related Stocks: Alphabet-A Alphabet-C Cisco Systems Citrix Systems Facebook Lyft Inc Cl A Microsoft Spotify Technology S.A. Uber Technologies Inc