The Boston law firm Goodwin is representing Slack Technologies Inc. in its upcoming offering of shares to retail investors, according to a filing Friday, again winning work in the slate of recent stock offerings from highly valued technology startups.
San Francisco-based Slack, the provider of a popular workplace chat app of the same name, filed on Friday for a direct listing of its shares. Direct listings are an alternative to initial public offerings. Another highly valued startup, Spotify Inc.…