Slack Technologies, Inc. (WORK)

[cintrix]

WORK due to start trading sometime today. This is a direct listing. Direct Listing vs IPO:
IPO vs. Direct Listing: An Overview

Initial public offerings and direct listings are two methods for a company to raise capital by listing shares on a public exchange. While many companies choose to do an initial public offering (IPO), in which new shares are created, underwritten and sold to the public, some companies choose a direct listing, in which no new shares are created and only existing, outstanding shares are sold with no underwriters involved.

https://www.investopedia.com/investing/difference-between-ipo-and-direct-listing/