Enterprise collaboration startup Slack went public last month on the NYSE under the ticker WORK. Rather than the usual IPO route, the company went public via a direct listing, similar to Spotify's listing last year. The direct listing allows Slack to trade its shares publicly without the usual lock-in periods 90 or 180 days. Its valuation initially popped and early investors and executives reportedly sold stock worth $592 million. Slack's Financials San Francisco-based Slack was founded in 2009 by Flickr founder Stewart Butterfield and other Flickr executives including Serguei Mourachov, Eric Costello, and Cal Henderson. Initially founded as a multi-player game developer, Slack pivoted itself as an enterprise chat app provider. Today, Slack offers group messaging apps for organizations and helps improve their workforce productivity to over 10 million daily active users and over 95,000 paying customers. For the recent Q1 2020, Slack reported revenue of $134.8 million, up 67%.