Slack Technologies, LLC
Financial Performance
Slack Revenue & Financials
Revenue
$902.6M (FY2021)
What is Slack's revenue?
Slack had $902.6M in revenue for fiscal year 2021, up 43.2% from 2020.
- Latest revenue
- $902.6M (FY2021)
- Year-over-year
- +43.2%
- Growth rate (CAGR)
- 50.1% over 2 years
- Peak revenue
- $902.6M (FY2021)
- Years of data
- 3
Financial Analysis
Slack's public filings show fast growth with operating losses. Revenue rose from $400.6 million in fiscal 2019 to $630.4 million in fiscal 2020 and $902.6 million in fiscal 2021. Fiscal 2021 GAAP gross margin was 86.5%, GAAP operating loss was $283.1 million, and free cash flow was $62.2 million. Net dollar retention was 123%, and 108 customers paid more than $1 million a year. Salesforce paid $27.7 billion in cash and stock for the company in 2021 and has not disclosed Slack revenue as a separate line since; Benioff's March 2026 comment that Slack revenue grew about 2.5 times in five years is the latest public indicator.
Revenue Trend Analysis
YoY Change
+43.2%
2-Year CAGR
+50.1%
Peak Year
2021
Trend
Not enough comparable years
Slack Technologies, LLC has 3 full fiscal year figures on this page, compounding at +50.1% annually over 2 years. The most recent year saw a 43.2% increase versus the prior year. Annual revenue peaked in fiscal year 2021 at $902.6M. Of 2 comparable year-over-year steps, 2 showed growth and 0 showed a decline.
Annual revenue history
| Fiscal Year | Revenue | YoY Change | Source |
|---|---|---|---|
| FY2021 | $902.6M | +43.2% | Slack fiscal 2021 results release Fiscal year ended January 31, 2021; last full year before Salesforce acquisition. |
| FY2020 | $630.4M | +57.4% | Slack fiscal 2020 results Fiscal year ended January 31, 2020. |
| FY2019 | $400.6M | — | Slack S-1 / fiscal 2019 results Fiscal year ended January 31, 2019. |
Click any row to see year details.
Keep researching Slack
Slack Revenue and Financial FAQ
What was Slack's revenue in its final standalone fiscal year?
In fiscal year 2021 (ended January 31, 2021), Slack's final year as an independent public company, it reported consolidated revenue of $902.6 million, representing a 43% year-over-year increase from $630.4 million in FY2020.
How much has Slack grown since being acquired by Salesforce?
While Salesforce does not report Slack as an isolated line item, CEO Marc Benioff disclosed in March 2026 that Slack's revenue had expanded approximately 2.5 times since the 2021 buyout, implying annual revenue run-rates exceeding $2.2 billion to $2.5 billion.
What were Slack's gross margins as an independent software company?
Slack maintained elite SaaS gross margins of 86.5% on a GAAP basis and 88.3% on a non-GAAP basis in fiscal 2021, reflecting the minimal hosting compute cost of delivering cloud-based text messaging and file attachments over AWS.
How many paid corporate customers does Slack have?
Slack reported over 156,000 paid customers at the end of FY2021 (up 42% year-over-year). In 2026, Salesforce noted that over one million commercial and non-profit organizations worldwide run workspaces on Slack.
How many enterprise customers spend over $100,000 annually with Slack?
At the time of its acquisition, Slack had 1,180 customers generating more than $100,000 in Annual Recurring Revenue (ARR) and 108 customers generating over $1 million annually, including companies like IBM and Amazon.
What was Slack's operating profitability prior to the Salesforce acquisition?
As an independent growth company, Slack prioritized rapid customer acquisition, posting a GAAP operating loss of $283.1 million in FY2021, though it generated positive operating cash flow of $148.2 million and free cash flow of $62.2 million.
What financial valuation multiple did Salesforce pay for Slack?
Salesforce paid approximately $27.7 billion in enterprise value, representing a rich valuation multiple of approximately 26x forward revenue, reflecting Slack's strategic role as Salesforce's digital engagement front-end.
How does Slack impact Salesforce's overall operating margin targets?
Following activist investor pressure on Salesforce in 2023, Slack streamlined overhead, eliminated duplicate real estate, and integrated G&A functions into Salesforce, contributing to Salesforce's expansion toward 32%+ adjusted operating margins.
What is Slack's Net Dollar Retention Rate?
Slack achieved a trailing 12-month Net Dollar Retention Rate of 123% at the end of fiscal 2021, demonstrating robust negative net churn as existing accounts added more employee seats.
How do AWS cloud infrastructure costs affect Slack's unit economics?
Slack operates entirely on Amazon Web Services (AWS) under multi-year cloud commitments exceeding $400 million, utilizing AWS Aurora, EC2, and S3 for scalable global storage and low-latency real-time message delivery.
What financial synergies resulted from combining Slack with Salesforce?
Salesforce leveraged its global 10,000+ enterprise sales force to sell Slack Enterprise Grid into major corporate IT accounts that standalone Slack sales teams could not easily access.
How does Slack handle stock-based compensation post-acquisition?
Following the transaction, Slack employee stock options and RSUs were converted into Salesforce common stock (NYSE: CRM), aligning employee incentives with Salesforce's total shareholder return.
Cite or embed this data
Using these figures? Please credit CorpDigest with a link.
CorpDigest. "Slack Revenue & Financials." CorpDigest, https://corpdigest.com/company/slack/financials.<div style="font-family:system-ui,sans-serif;font-size:14px;line-height:1.5;border:1px solid #e2e8f0;border-radius:8px;padding:12px 16px;max-width:520px"><strong>Slack reported $902.6M in revenue (FY2021).</strong><br>Source: <a href="https://corpdigest.com/company/slack/financials" target="_blank" rel="noopener">CorpDigest — Slack financials</a></div>Related Financial Audits
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