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)
952 (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
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
Tokyo, JP
1-9-2 Otemachi
Toronto, CA
171 John Street
New York, US
436 Lafayette Street
Melbourne, AU
551 Swanston St
Vancouver, CA
1028 Hamilton Street
Show all (8)

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 Sep, 2017
Y, 2016Mar, 2017Apr, 2017Sep, 2017

Paying Users

1.25 m2 m

Daily Active Users

4 m5 m6 m


4 m


1.5 m
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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.

Slack Job Categories

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Traffic Overview of Slack

Slack Online and Social Media Presence

Slack News and Updates

Dialogs, buttons, and menus make bots more productive

GUEST: Conversational interfaces have become a larger part of our day-to-day lives. Many of us wake up in the morning and talk to Alexa or Google Home about the weather, ask Siri to “call mom” during our commute, and engage with several Slack apps and bots throughout the workday. But as the AI and b…

The Biggest Wins (and Mistakes) You Can Make In Your Office Design

Whether you're a startup or an established brand, follow these do's and don'ts when outfitting your work space.

Here's what people actually say when they block you on a dating app

Ever wonder what kinds of crazy stuff people say about matches they flag or block on dating apps? Well, The League has a juicy internal Slack channel that’s chock full of this exact type of user feedback. They've shared a selection with Mashable, and it's frighteningly relatable. There's the perso… launches a Slack bot to improve file searches came out of private beta today with the launch of a Slack bot to help teams and businesses locate files across a variety of enterprise services. Backed by General Catalyst and Slack Fund, Butter is launching a bot with the ability to search files from a series of popular cloud services and…

This Slack Engineer’s Secret To Making Firing Conversations Less Traumatic

“You’re not the one getting fired, so you shouldn’t ever talk about how it’s been so difficult for you.” The first job I had after college was in consulting. One of my managers there was the first one who wasn’t just thinking about how to manage me day to day, but about my skills and growth. I didn’…

This is How to Make Slack Less of A Time Suck

There’s no need for notifications overload. As the message volume grows in a company, communicating in Slack can begin to feel like drinking from a fire hose.Read Full Story
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Slack Company Life and Culture

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