Slack Raises $160 Million Round at $2.8 Billion Valuation

Slack has confirmed a previous rumour: the Canadian-born startup is raising a $160 million round at a valuation of $2.8 billion, building on the $120 million it raised at a $1.12 billion valuation in October. 

Investors in this round include Horizons Ventures, Digital Sky Technologies, and Index Ventures.

More than doubling its valuation in just half a year, Stewart Butterfield’s potential unicorn now boasts more than 200,000 paying users.

“Slack radically increases internal transparency and turns communication archives into a powerful shared resource,” Butterfield said earlier this year. “We feel safe predicting all businesses will move a centralized system for communication within the next 10 years.”

Slack’s growth, according to Butterfield, “has no parallel.”