Slack Technologies, Inc. is “seriously” considering making its stock exchange debut through a direct listing, a source familiar with the matter told Reuters. The Wall Street Journal reported that Slack is likely to debut in the second quarter of 2019 and currently expects to do so via a direct listing. “Slack’s direct listing is an inherently less expensive way of going public, but what it really comes down to is speed,” said Daniel Lugasi, a portfolio manager at Florida-based VL Capital Management. Slack declined to comment on reports of direct listing.