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)
1,004 (est)+2%
Slack was founded in 2009 and is headquartered in San Francisco, US

Key People/Management 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 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 July 2017 was reported to be $250 m. In total, Slack has raised $790 m. Slack's latest valuation is reported to be $5.1 b.

Slack Financials

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

Revenue (Y, 2016)

64 m

Market valuation

5.1 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 Nov, 2017
Y, 2016Mar, 2017Apr, 2017Jun, 2017Sep, 2017Nov, 2017


4 m

Paying Users

1.25 m1.5 m2 m

Daily Active Users

4 m5 m5 m6 m

Enterprise Customers

38 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

How to Motivate Your Employees to Use Slack and Other Social Tools in 4 Easy Steps

Getting employees to use social tools can feel like pulling teeth. These four strategies will increase your chances of a successful rollout.

Slack finally fixed the image upload bug that drove me nuts for months

The time has finally come: following months of complaints from miffed users – myself included – Slack has released a fix for the rage-inducing drag-and-drop image upload feature that caused its app to abruptly crash when hovering pictures over the messaging client. The fix, which is readily availabl…

10 Important Questions You Need to Ask About Your Company's Culture

Culture is not foosball and free beer.

Slack expands into Japanese, its fifth language

Slack has announced that its popular team collaboration software is now localized for the Japanese market. The news comes just a few months after the San Francisco-based company expanded beyond English into Spanish, French, and German and revealed that Japanese would be next up. Users can manually c…

5 Apps That Will Make Your Employees Happier

Want to ensure your team is getting things done but still have their head above water? Check out my top employee-friendly software picks.

Atomist launches to help developers automate repository creation and code deployment

EXCLUSIVE: A new company emerged from stealth today, aimed at helping developers better automate the work they’re doing. Called Atomist, it’s designed to help developers automatically create source code repositories and then automate the deployment of their code in a way that helps ensure quality wh…
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Slack Company Life and Culture

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