Slack is a team communication application providing services such as real-time messaging, archiving and search 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)
1,053 (est)
Slack was founded in 2009 and is headquartered in San Francisco, US

Key People/Management at Slack

Stewart Butterfield

Stewart Butterfield

Co-Founder / CEO
Allen Shim

Allen Shim

Cal Henderson

Cal Henderson

Robert Frati

Robert Frati

Vice President of Sales
Brandon Zell

Brandon Zell

Corporate Controller
Sarah Friar

Sarah Friar

Independent Board Member
April Underwood

April Underwood

VP of Product

Slack Office Locations

Slack has offices in San Francisco, Dublin, London, Vancouver and in 5 other locations
San Francisco, US (HQ)
155 5th Street 6th Floor
New York, US
436 Lafayette Street
Melbourne, AU
551 Swanston St
Toronto, CA
171 John Street
Vancouver, CA
1028 Hamilton Street
Dublin, IE
4th Floor, One Park Place
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Slack Financials and Metrics

Summary Metrics

Slack's latest funding round in September 2017 was reported to be $250 m. In total, Slack has raised $927.3 m. Slack's latest valuation is reported to be $4.8 b.
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Slack Financials

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

Revenue (Y, 2016)

64 m

Market valuation

4.8 b
USDY, 2016


64 m
USDY, 2016


118.8 k
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Slack Operating Metrics

Slack's Users was reported to be 4 m in 2016. Slack's Daily Active Users was reported to be 6 m in Sep, 2017. Slack's Enterprise Customers was reported to be 50 k in Feb, 2018
Y, 2016Mar, 2017Apr, 2017Jun, 2017Sep, 2017Nov, 2017Feb, 2018


4 m

Paying Users

1.25 m1.5 m2 m

Daily Active Users

4 m5 m5 m6 m

Enterprise Customers

38 k50 k50 k50 k
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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.
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Slack's Web-traffic and Trends

Slack Online and Social Media Presence

Slack News and Updates

Beware! Slack leaks are the new email leaks

When Amy Pascal's ruthless emails leaked in the infamous Sony hack, friends of mine who worked in the entertainment industry were less than shocked, recalling that her emails just reflected how everyone speaks, and how deals get made, in Hollywood.  And when John Podesta's leaked emails revealed t…

Slack adds Edith Cooper to board of directors

 Slack had added Edith Cooper, who most recently served as the global head of human capital management at Goldman Sachs, to its board of directors. As Slack prepares “for accelerated growth at scale,” Slack CEO Stewart Butterfield wrote in a blog post today, Cooper marks Slack’s second independent b…

Workast raises cash to expand beyond Slack with its message-based task management toolkit

 Workast, the popular Slack-based task management toolkit, is looking to expand its messaging horizons. The company, which answered the prayers of everyone who was sick of working with Asana and other task management applications, has raised $1.85 million in a seed round of funding led by Greycroft …

Hate Slack’s new Emoji? Here’s how to bring back the old ones

Slack now forces you to use specific emoji depending on your system of choice. Mac and iOS users will still see Apple’s emoji, which used to be the default for all users. But now Windows, Android, and Linux users will see Google’s very divisive emoji introduced with Android Oreo. In comparison with …

4 Tools to Free Your Startup and Let It Do What It Does Best

Creating a lean team hinges on automation. Learn how to automate design, communication, assistance, and contracts.

The future of AI in document management

Over the next five years, AI is expected to give rise to many new possibilities such as facial recognition, driverless vehicles and talking documents.
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Slack Company Life and Culture

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