> In previous rounds, Slack’s CEO and co-founder Stewart Butterfield has said that the company raises “opportunistically.” That is, it doesn’t have to raise mon

> In previous rounds, Slack’s CEO and co-founder Stewart Butterfield has said that the company raises “opportunistically.” That is, it doesn’t have to raise money because it’s already making money and still has some in the bank, but as long as VCs are knocking, it’s worth taking the funding if it’s coming in at good valuations because you never know what might lie ahead.