Slack is an enterprise software platform that allows teams and businesses of all sizes to communicate effectively.

Slack is the leading global collaboration hub that makes people’s working lives simpler, more pleasant and more productive. From global Fortune 100 companies to corner markets, businesses and teams of every kind use Slack to bring the right people together with all the right information. Slack is headquartered in San Francisco CA, and has nine offices around the world. For more information on how Slack makes teams better connected, visit

Founders:  Cal Henderson, Eric Costello, Serguei Mourachov, Stewart Butterfield