Slack 'seriously considering' direct market listing - source

(Reuters) - Slack Technologies Inc is "seriously" considering making its stock exchange debut through a direct listing, a source familiar with the matter told Reuters on Friday.The Wall Street Journal reported earlier in the day that Slack, which operates a popular workplace instant-messaging and collaboration app, is likely to debut in the second quarter and currently expects to do so via a direct listing. (https://on.wsj.com/2CfAYGp)The plan for a direct listing will make Slack the second big..