Slack

Acquired

Workplace messaging and collaboration platform that transformed business communication. Originally built as an internal tool at Tiny Speck during development of the game Glitch, then pivoted to become the fastest-growing enterprise software company in history.

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

Company

Founded
2009
Headquarters
San Francisco, US
Employees
1001-5000

Financials

Total Funding
$1.4B
Last Valuation
$7.1B
Revenue (ARR)
$100M-$500M
Sectors
SaaS Productivity
slack.com Twitter Blog

Funding History

9 rounds
Acquired by Salesforce Jul 21, 2021
$27.7B
Series H Aug 21, 2018
$427M
Valuation: $7.1B
Dragoneer Investment Group (Lead) General Atlantic (Lead) T. Rowe Price Wellington Management Baillie Gifford Sands Capital
Series G Sep 17, 2017
$250M
Valuation: $5.1B
SoftBank Vision Fund (Lead) Accel
Series F Apr 1, 2016
$200M
Valuation: $3.8B
Thrive Capital (Lead) GGV Capital Comcast Ventures Accel Index Ventures Social Capital
Series E Apr 16, 2015
$160M
Valuation: $2.8B
Horizons Ventures (Lead) Index Ventures DST Global IVP Spark Capital Andreessen Horowitz Social Capital GV (Google Ventures) Kleiner Perkins
Series D Oct 31, 2014
$120M
Valuation: $1.1B
Kleiner Perkins (Lead) GV (Google Ventures) (Lead) Andreessen Horowitz Accel Social Capital
Series C Apr 27, 2014
$43M
Social Capital (Lead) Accel Andreessen Horowitz
Series B Apr 1, 2011
$11M
Andreessen Horowitz (Lead) Accel (Lead)
Series A Apr 1, 2010
$5M
Accel (Lead) Andreessen Horowitz (Lead)
Seed Jan 1, 2009
$2M
Rob Solomon Marc Andreessen Jeff Weiner Bradley Horowitz Accel

Funding data is compiled from multiple independent sources including company announcements, press coverage, and regulatory filings. While we strive for accuracy, amounts and dates may reflect reported figures at time of announcement.