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.
San Francisco, US
Size (employees)
1,132 (est)+4%
Slack was founded in 2009 and is headquartered in San Francisco, US
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Key People/Management at Slack

Stewart Butterfield

Stewart Butterfield

Co-Founder / CEO
Allen Shim

Allen Shim

Cal Henderson

Cal Henderson

Michael Lopp

Michael Lopp

VP, Engineering
Ali Rayl

Ali Rayl

VP, Customer Experience
Robert Frati

Robert Frati

VP, Sales
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Slack Office Locations

Slack has offices in Tokyo, Toronto, London, San Francisco and in 4 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 $5.1 b.
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Slack Financials

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

Revenue (Y, 2016)

64 m

Market valuation

5.1 b
USDY, 2016E


64 m
USDY, 2016


118.8 k
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Slack Operating Metrics

Slack's Users was reported to be 4 m in Y, 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 m1.50 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
Screenhero January 28, 2015
Spaces September 26, 2014
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Slack News and Updates

5 Ways You Can Figure Out How You’re Wasting Your Time

Completing small tasks might give us a rush of dopamine. But it’s tackling the big, complex ones that really make a difference. As human beings, we’re hardwired to want to reach the finish line. We crave completion. Crossing items off a to-do list and saying we finished and can move onto the next t…

Slack CEO Stewart Butterfield details approach to sustaining an inclusive workforce

In light of the tech industry’s last year of one sexual harassment scandal after another, Slack CEO Stewart Butterfield says the company has had active conversations about the issues. However, Slack has not made any specific policy changes at the company. While no overt cultural issues at Slack have…

Domino’s will now deliver to 150,000 parks, pools and other non-traditional locations

Domino’s will now deliver your pizza to the beach – well, sort of! Or the park, the sports field, that one gas station down the road, or some notable landmark in your city where it will be easy for your delivery driver to find you, among other places. The company announced today the launch of […]

3 Communication Hacks That Will Make Everyone Want to Work With You

In order to get people to understand you, you just need to get to the point.

Sensu raises $10M to build a robust monitoring system for all your different operations

While companies’ operations become increasingly fragmented into a wide variety of different spots — especially if they exist somewhere in a group of different cloud tools — making sure those operations are still healthy has become more and more critical. And for companies whose lifeblood is directly…

These Smart Managers Offer 31 Useful Ideas to Help You Communicate with Your Team

Get the fundamentals right--and try the scrum
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