Slack is a cloud-based team messaging and collaboration platform that enables organizations to streamline communication and workflows. Founded in 2013 as a pivot from the failed online game Glitch by Tiny Speck, Slack became the fastest-growing enterprise software product in history with 5-10% weekly growth. The platform went public via direct listing on NYSE on June 20, 2019, and was subsequently acquired by Salesforce on July 21, 2021 for $27.7 billion.
Slack is publicly traded
Listed directly on June 20, 2019
This company is no longer available on our private secondary market. Shares can be traded publicly under WORK.
Company data and valuation marks are estimates and may be incomplete, stale, erroneous, or revised.
Founded
2013
Total Funding
$28.92B
11 rounds
Last Private Valuation
$27.7B
July 21, 2021
Total raised $28.92B across 11 rounds
Funding data and valuation marks are estimates and may be incomplete, stale, erroneous, or revised.
Last updated 06-25-2026
Latest Round
Type
Acquisition by Salesforce (terminal)
Date
July 21, 2021
Amount
$27.7B
Valuation
$27.7B
Lead Investors
| Date | Round | Amount Raised | Valuation | Lead Investors |
|---|---|---|---|---|
| July 21, 2021 | Acquisition by Salesforce (terminal) | $27.7B | $27.7B | Salesforce |
| June 20, 2019 | Direct Listing (NYSE) | $0 | $24.3B | N/A |
| August 21, 2018 | Series H | $427M | $7.1B | Dragoneer Investment Group, General Atlantic |
Funding data and valuation marks are estimates and may be incomplete, stale, erroneous, or revised.
Valuation indexed to 1.0× at the selected entry round. Valuation marks are estimates and may contain errors. Hover each dot to compare.
Entry · Series A (Tiny Speck)
$0.0B
Apr 2010
Slack today
$27.7B
Jul 2021 · latest mark
Slack multiple
1154x
valuation uplift since first round
Y-axis is logarithmic. Hollow dots = estimated valuations. Does not represent realized investor returns.
Rob Seaman
Interim Chief Executive Officer
Cal Henderson
Chief Technology Officer
Allen Shim
Chief Financial Officer
Geoff Belknap
Chief Security Officer
Competitor list is illustrative and may be incomplete, stale, or erroneous.
Microsoft Teams
Cloud-based team collaboration platform integrated with Microsoft 365 ecosystem. Used by 270 million daily active users worldwide for enterprise communication and collaboration.
Mattermost
Open-source workplace messaging and collaboration platform with on-premises and cloud deployment options. Ranked #1 Most Loved alternative to Slack in Stack Overflow 2022 Developer Survey.
Discord
Real-time communication platform initially developed for gaming but now used by businesses for team collaboration with strong audio and video capabilities.
Yes, Slack is publicly traded under the ticker symbol WORK on the NYSE. The company went public in June 20, 2019.
Slack trades under the ticker symbol WORK on the NYSE. It began trading in June 20, 2019.
Slack (WORK on the NYSE) shares can be purchased through any standard brokerage account — including Fidelity, Charles Schwab, TD Ameritrade, and online platforms like Robinhood or E*TRADE. Search for the ticker WORK to place an order.
Slack went public in June 20, 2019 via direct_listing, with an offering valuation of approximately $27.7B. Slack Technologies went public via direct listing on the NYSE on June 20, 2019 with an opening price of $38.50 per share and initial market capitalization of $21.4 billion. The company was subsequently acquired by Salesforce on July 21, 2021 for approximately $27.7 billion, marking Salesforce's largest acquisition to date.
Slack raised $28.92B across 11 disclosed funding rounds prior to its public listing.
Slack is headquartered in San Francisco, CA, United States.
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