Slack Technologies is a company developing collaboration software. It offers a team communication application that provides messaging, video and voice calls, organized conversations, integrated file sharing, searchable history, and other capabilities as well as numerous integrated third-party tools. The company serves engineering, financial services, sales, IT, marketing, customer support, HR, project management, and media industries.

Employee Rating

Parent CompanySalesforce
HQSan Francisco, CA, US
Cybersecurity ratingAMore
Slack was founded in 2009 and is headquartered in San Francisco, CA, US

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Key People/Management at Slack

Stewart Butterfield

Stewart Butterfield

Co-Founder and CEO, Board Member
Cal Henderson

Cal Henderson

Co-Founder and Chief Technology Officer
Allen Shim

Allen Shim

Chief Financial Officer
Tamar Yehoshua

Tamar Yehoshua

Chief Product Officer
David Schellhase

David Schellhase

General Counsel
Julie Liegl

Julie Liegl

Chief Marketing Officer
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Slack Office Locations

Slack has offices in San Francisco, Denver, Carlton, Sydney and in 6 other locations
San Francisco, CA, US (HQ)
500 Howard St
Denver, CO, US
1681 Chestnut Pl #700
San Francisco, CA, US
500 Howard St, San Francisco
Carlton, AU
551 Swanston St
Sydney, AU
5 Martin Pl
Toronto, CA
171 John St 5th Floor
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Slack Financials and Metrics

Summary Metrics

Founding Date


Total Funding

$1.3 b


In total, Slack had raised $1.3 b. Slack is a subsidiary of Salesforce

Slack Revenue

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Slack's revenue was reported to be $902.61 m in FY, 2021 which is a 43.2% increase from the previous period.
USDFY, 2019FY, 2020FY, 2021



Revenue growth, %


Cost of goods sold


Gross profit

USDQ2, 2019Q3, 2019Q1, 2020Q2, 2020Q3, 2020Q1, 2021Q2, 2021Q3, 2021Q1, 2022



Cost of goods sold


Gross profit


Gross profit Margin, %

USDFY, 2019FY, 2020FY, 2021



Accounts Receivable


Current Assets



USDQ1, 2020Q2, 2020Q3, 2020Q1, 2021Q2, 2021Q3, 2021Q1, 2022



Accounts Receivable


Current Assets



USDFY, 2019FY, 2020FY, 2021

Net Income


Depreciation and Amortization


Accounts Payable


Cash From Operating Activities

USDQ1, 2020Q2, 2020Q3, 2020Q1, 2021Q2, 2021Q3, 2021Q1, 2022

Net Income


Depreciation and Amortization


Accounts Payable


Cash From Operating Activities

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Slack Operating Metrics

FY, 2018Feb, 2018May, 2018Jan, 2019FY, 2019Q1, 2020Q2, 2020Sep, 2019Q3, 2020FY, 2020Mar, 2020Q1, 2021Q2, 2021Q3, 2021FY, 2021Q1, 2022

Enterprise Customers

500 k600 k600 k600 k660 k750 k756 k

Paid Customers

59 k50 k70 k88 k95 k100 k105 k110 k110 k122 k130 k142 k156 k169 k

$100k+ Enterprise Customers

2985756457208218939639851.08 k1.18 k1.29 k

Daily Active Users

8 m10 m10 m10 m12 m12.5 m
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Slack Acquisitions / Subsidiaries

Company NameDateDeal Size
WovenApril 30, 2021
RimetoJuly 08, 2020
Astro TechnologySeptember 24, 2018
HipChatJuly 27, 2018
StrideJuly 27, 2018
MissionsJuly 17, 2018
Screenhero, IncJanuary 28, 2015
SpacesSeptember 26, 2014
Rimeto, Inc.
Slack Australia Pty LTD
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Slack Revenue Breakdown

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Slack revenue breakdown by geographic segment: 61.4% from United States and 38.6% from International

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Slack Cybersecurity Score

Cybersecurity ratingPremium dataset



SecurityScorecard logo

Slack Environment, Social & Governance (ESG) Ratings

CSRHub ESG ratingPremium dataset


out of 100

CSRHub logo

Slack Online and Social Media Presence

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Slack Company Culture

  • Overall Culture



  • CEO Rating



  • Compensation



  • Diversity



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Slack News and Updates

Slack and Starbucks Hire Employees With a Criminal History. Here’s Why You Should Too

Diversity and inclusion remain a top business priority for 2022, but a new report shows employers continue to look past one neglected population.

6 hacks for making Slack less stressful

Productivity experts offer their tips and tricks for reducing notification overload. Slack is arguably the most important communication tool for remote workers today, but it also has the potential to be the single biggest productivity killer.Read Full Story

Iranian Hackers Abuse Slack For Cyber Spying

IBM researchers claim an Iranian-linked crew called MuddyWater has been trying to avoid detection by using Slack to control their malware. It’s believed to be the first time a suspected state-backed hacking outfit has been seen using such a technique.

Officely raises $2M to help hybrid teams coordinate office time right in Slack

So your company is going WFH/Office hybrid. Great! Working from home more rules, even if management decisions or the specifics of your role mean it can’t happen every day. Now, how do you coordinate who goes in the office and when? Does it have to be the same day(s) every week? Do you just pick […]

4 Ways To Build Trust Via Zoom and Slack

As the workplace becomes all-remote, it's critical to be able to bond over video. Here's how.
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Slack Blogs

Turn your Slack data into actionable insights with the new Splunk app

It’s no secret that humans aren’t great at analyzing data on our own, particularly when it comes to massive, unstructured data sets. The good news is there’s Splunk, which is designed to help investigate, monitor, analyze and take action on data.  With Splunk’s Data-to-Everything Platform, companies…

Introducing powerful new layers of enterprise-grade security

In the wake of the Covid-19 pandemic, digital transformation is happening at warp speed. The kind of widespread technological adaptation we expected to see years from now has been truncated to a matter of months as organizations adopt cloud solutions to keep their teams connected. And as more and mo…

Slack Announces Date of Second Quarter Fiscal Year 2021 Financial Results

SAN FRANCISCO, August 10, 2020—Slack Technologies, Inc. (NYSE:WORK) today announced that it will report its financial results for the second quarter of fiscal year 2021, ended July 31, 2020, following the close of the U.S. markets on Tuesday, September 8, 2020. Slack will host a conference call that…

Update on extended work from home for Slack employees

As hopes for a quick recovery from the coronavirus pandemic have faded, it’s time to think more broadly about how we work. After all, successfully adapting to remote work depends on much more than replicating at home the same processes we once carried out in a physical office. In order to rethink ho…

Le Wagon scales one the world’s best coding bootcamps with Slack

For anyone interested in breaking into the technology industry or taking their computer programming and leadership skills to the next level, international coding bootcamp Le Wagon is here to help. Founded in Paris in 2013, Le Wagon has since expanded to 39 cities in 20 countries. And Slack, the chan…

New guide: Navigating the disruption of work

We don’t have to tell you all the ways work has changed over the past few months. If you worked in an office, you probably don’t right now. In-person meetings have been replaced by video conferencing, the nursery has become a study and your old routine is probably toast. Across the globe, organizati…
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Slack Frequently Asked Questions

  • When was Slack founded?

    Slack was founded in 2009.

  • Who are Slack key executives?

    Slack's key executives are Stewart Butterfield, Cal Henderson and Allen Shim.

  • How many employees does Slack have?

    Slack has 2,597 employees.

  • What is Slack revenue?

    Latest Slack annual revenue is $902.6 m.

  • What is Slack revenue per employee?

    Latest Slack revenue per employee is $347.6 k.

  • Who are Slack competitors?

    Competitors of Slack include Telegram, Flock and Mattermost.

  • Where is Slack headquarters?

    Slack headquarters is located at 500 Howard St, San Francisco.

  • Where are Slack offices?

    Slack has offices in San Francisco, Denver, Carlton, Sydney and in 6 other locations.

  • How many offices does Slack have?

    Slack has 11 offices.