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Slack

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Internal messaging and collaboration solutions for teams

San Francisco, United StatesFounded 2009Other B2B Software
Valuation $23B Market cap · 2026
Revenue $1.80B Latest reported FY
EBITDA $25M Latest reported FY

At a glance

Founded
2009
Headquarters
San Francisco, United States
Listing
IPO 2019
Sector
Other B2B Software
Power Law
Decacorn$10B+ valuation tierThoroughbred$100M+ revenue

Knowledge graph

News, research, reports and resources connected to this company by Dealroom
News Inside OpenAI's Navier-Stokes agent swarm — Noam Brown on multi-agent, RSI and alignment Sep 18, 2026 Analysis British diaspora have built $319.2B of unicorns abroad Sep 15, 2026 Analysis The most valuable companies in the British Diaspora Index Sep 15, 2026 Analysis British-founded unicorns: 41% built in the US, 48% in the United Kingdom Sep 15, 2026 Analysis British founders: $319.2B of unicorns abroad, $490.3B at home Sep 15, 2026 News SecureSky buys London's Soveren to add real-time data security Sep 9, 2026

Investors

40 investors on the cap table

From Dealroom's funding and investor records, grouped by the round each investor first entered.

Seed8 investors entered at this stage

Series B and later32 investors entered at this stage

Talent

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Employees mapped 2,651 incl. 62 AI specialists
Founders Hidden — book a demo/100 quality score
Key operators 14 quality Hidden — book a demo/100
Potential founders Hidden — book a demo likely future founders
Startup mafia 12 alumni-founded startups
Talent movements Hidden — book a demo in · Hidden — book a demo out past 12 months

Source: Dealroom Talent Intelligence.

Alumni founders

5 of 12 startups shown

Former Slack employees who went on to found companies, sorted by Dealroom signal score.

PylonEst. 2022
Advith ChelikaniUnited States
Signal score92
VCR GroupEst. 2021
Gary VaynerchukUnited States
Signal score88
HearthEst. 2016
Nikhil PaiUnited States
Signal score85
SeriesEst. 2021
Brexton PhamUnited States
Signal score84
Flax HealthEst. 2025
Trent HazyUnited States
Signal score84
7 more alumni-founded companies in this previewBook a demo

Global footprint

Workforce and web traffic by country
Workforce by country
39 countries with
team presence
🇺🇸 United States69%
🇨🇦 Canada9.7%
🇮🇪 Ireland4.8%
🇦🇺 Australia3.1%
🇮🇳 India2.4%
Top 5 of 39 shown
Web traffic by country
140M monthly visits
across markets
🇺🇸 United States32.9%
🇯🇵 Japan21.9%
🇮🇳 India5.5%
🇬🇧 United Kingdom3.4%
🇵🇭 Philippines2.7%
Top 5 markets shown

Patents

Estimated portfolio value
$141M

196 active patent families included in this estimate.

A patent family groups patent filings for the same invention. Source: Dealroom · PatSnap.

Explore the patent portfolioPatent records, technology areas and peer comparisonsBook a demo

Investments and acquisitions

Disclosed deals where Slack was the backer or acquirer, 2014–2025. Toggle between venture rounds, M&A, or both. The map below is grouped by the target company's sector — the colored pill on each chip is the round type.

Portfolio analysis

141 deals across Slack's capital deployment.

Where the deals concentrate by sector, stage, and decade.

By sectorCount
    By stageCount
      By periodCount

        Where Slack deploys vs peers

        Each axis is a Dealroom topic tag — picked from the cluster's most-tagged themes. Values are normalized per axis: the peer with the highest tag-coverage on that axis sits at the edge, others scale relative to them. Toggle between M&A, venture, or both.

        Compare against

        Slack's portfolio, mapped.

        Stage
        Period
        141 of 141 deals

        Market sentiment

        Posts on X, past 7 days

        An AI-synthesised read of the highest-engagement posts about Slack on X, ranked by likes and reposts, corporate channels excluded.

        Reading the room on X — pulling top posts and synthesizing themes…

        Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour

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