Slack
Valuation
$27.7B
2020 Revenue
$1.7B
Customers
10M
Funding
$35.2B
Avg ACV
$170
Team
2.7K
Founded
2009
How Slack CEO Stewart Butterfield grew Slack to $1.7B revenue and 10M customers in 2020.
Slack Technologies, Inc. is an American international software company founded in 2009 in Vancouver, British Columbia, Canada.
Last updated
Slack Revenue
In 2020, Slack's revenue reached $1.7B. Since its launch in 2009, Slack has shown consistent revenue growth.
| Year | Milestone |
|---|---|
| 2020 | Slack Hit $1.7b revenue in August 2020 |
| 2009 | Launched with $0 revenue |
Slack Valuation, Funding Rounds
Slack reached a $27.7B valuation in 2019.
Slack has raised $35.2B in total funding across 9 rounds, with its most recent round in 2021.
| Year | Round | Amount | Valuation | % Sold |
|---|---|---|---|---|
| 2021 | Funding round | $27.7B | - | - |
| 2019 | Funding round | $4.6B | $19.5B | 23% |
| 2018 | Series H | $427M | $6.7B | 6% |
| 2017 | Series G | $412.7M | $4.9B | 9% |
| 2016 | Series F | $208M | $3.6B | 6% |
| 2015 | Series E | $1.7B | $2.6B | 65% |
| 2014 | Series D | $110.8M | $1B | 11% |
| 2014 | Series C | $42.8M | $237.5M | 18% |
| 2011 | Series B | $10.7M | $66.7M | 16% |
Slack Employees & Team Size
Slack employs approximately 2.7K people as of 2026.
Slack has 2.7K total employees in different roles and functions and 447 sales reps that carry a quota. They have 10M customers that rely on the company's solutions.
| Year | Milestone |
|---|---|
| 2020 | Reached 2.7K employees (August 2020) |
Founder / CEO
Q&A
| Question | Answer |
|---|---|
| What's your age? | - |
| Favorite online tool? | - |
| Favorite book? | - |
| Favorite CEO? | - |
| Advice for 20 year old self | - |
Customers
See how Slack acquires and retains customers with data on acquisition costs and revenue performance. Log in to access the complete customer economics dashboard.
LockedFrequently Asked Questions about Slack
What is Slack's revenue?
Slack generates $1.7B in revenue.
Who founded Slack?
Slack was founded by Stewart Butterfield.
Who is the CEO of Slack?
The CEO of Slack is Stewart Butterfield.
How much funding does Slack have?
Slack raised $35.2B.
How many employees does Slack have?
Slack has 2.7K employees.
Where is Slack headquarters?
Slack is headquartered in San Francisco, California, United States.
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Compare Slack to the industry
Slack operates across multiple industries. Browse revenue, funding, and growth data for Slack in each sector below.
Source Attribution
Source: all data was collected from GetLatka company research and founder interviews. Revenue, funding, team, and customer figures are presented as company-reported or GetLatka-estimated metrics where the profile data identifies them that way.
Company data last updated .