Slack is a real-time messaging application for modern teams. It offers one-on-one messaging, private groups, persistent chat rooms, and direct messaging as well as group chats organized by topic. All content inside Slack is searchable from one search box and it integrates with a number of third-party services, including Google Docs, Dropbox, Heroku, Crashlytics, GitHub, and Zendesk.

Company Growth (employees)
San Francisco, US
Size (employees)
846 (est)+12%
Slack was founded in 2009 and is headquartered in San Francisco, US

Key People at Slack

Stewart Butterfield

Stewart Butterfield

Co-Founder / CEO
Cal Henderson

Cal Henderson

Robert Frati

Robert Frati

Vice President of Sales
April Underwood

April Underwood

VP of Product
Brandon Zell

Brandon Zell

Corporate Controller
Sarah Friar

Sarah Friar

Independent Board Member
Allen Shim

Allen Shim

SVP of Finance & Operations

Slack Office Locations

Slack has offices in San Francisco, Dublin, London, Vancouver and in 4 other locations
San Francisco, US (HQ)
155 5th Street 6th Floor

Slack Data and Metrics

Summary Metrics

Slack's latest funding round in April 2016 was reported to be $200 m. In total, Slack has raised $540 m. Slack's latest valuation is reported to be $3.8 b.

Slack Financial Metrics

Slack's revenue was reported to be $64 m in 2016
$, USD

Revenue (Y, 2016)

64 m

Market valuation

3.8 b
$, USDY, 2016


64 m
$, USDY, 2016


118.8 k

Slack Operating Metrics

Slack's Users was reported to be 4 m in 2016. Slack's Enterprise Customers was reported to be 38 k in Apr, 2017. Slack's Daily Active Users was reported to be 5 m in Mar, 2017. Slack's Accounts was reported to be 1.5 m in Mar, 2017
Y, 2016Mar, 2017Apr, 2017

Daily Active Users

4 m5 m

Paying Users

1.25 m


4 m


1.5 m

Enterprise Customers

38 k

Slack Acquisitions / Subsidiaries

Acquired CompanyDateDeal Size
ScreenheroJanuary 28, 2015
SpacesSeptember 26, 2014
Slack's employees are reported to be approximately 44% female and 56% male.

Slack Job Categories

Slack Online and Social Media Presence

Slack News and Updates

Slack Company Life and Culture

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