Slack
San Francisco, California, United States
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 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 | Quote |
|---|---|---|
| 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 | Quote |
|---|---|---|---|---|---|
| 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% |
Founder / CEO
Q&A
| Question | Answer |
|---|---|
| What's your age? | - |
| Favorite online tool? | - |
| Favorite book? | - |
| Favorite CEO? | - |
| Advice for 20 year old self | - |
Customers
Slack serves 10M customers.
Slack Employees & Team Size
Slack employs approximately 2.7K people as of 2026, including 447 sales reps that carry a quota. It serves 10M customers that rely on its solutions.
| Year | Milestone |
|---|---|
| 2020 | Reached 2.7K employees (August 2020) |
Frequently 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 across 9 rounds.
How many employees does Slack have?
Slack has 2.7K employees.
Where is Slack headquarters?
Slack is headquartered in San Francisco, California, United States.
Compare Slack to the industry
Slack operates across multiple industries. Browse revenue, funding, and growth data for Slack in each sector below.
Data and Sources
All figures on this page are taken directly from interviews or are estimates from public sources and proprietary models. Not financial advice. Read full disclaimer.
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