--- title: "Companies using Slack (390K+) · Nov 2026" description: "390K+ companies use Slack. See who started in the last 90 days, who stopped, and where they went, by industry, size and country." url: https://www.incumbently.com/companies-using/slack --- Team communication · Last verified Nov 6, 2026 # Companies using Slack 390K+ and counting. Incumbently sees 390K+ companies using Slack. 420+ started in the last 90 days and 0 stopped. Each one shows the signal type we found and when. [Start free](https://app.incumbently.com/signin)[See pricing](https://www.incumbently.com/pricing) New Slack customers, per month Dec 2025 – Oct 2026 390K+ Companies using Slack 420+ Started in the last 90 days Stopped in the last 90 days The list ## Slack customers, newest first. Each row shows when we first saw the tool and the type of signal that confirms it. | Company | Industry | Size | Country | First seen | Signal | Status | | ---------------------------------------- | --------------------------------------------------- | --------- | ------- | ----------- | ------ | ------ | | ZBiotics zbiotics.com | Biotechnology Research | 11–50 | US | Nov 6, 2026 | Web | New | | Somos Internet somosinternet.co | Technology, Information and Internet | 501–1,000 | CO | Nov 6, 2026 | Web | New | | Vitesse PSP BV vitessepsp.com | Financial Services | 51–200 | GB | Nov 5, 2026 | Web | New | | Upflow upflow.io | Software Development | 51–200 | US | Nov 5, 2026 | Web | New | | RightWalk Foundation rightwalk.org | Non-profit Organizations | 51–200 | IN | Nov 5, 2026 | Web | New | | Paramify paramify.com | Data Security Software Products | 51–200 | US | Nov 4, 2026 | Web | New | | Oguste oguste.fr | Software Development | 2–10 | FR | Nov 4, 2026 | Web | New | | Revalue revalue.earth | Environmental Services | 11–50 | GB | Nov 4, 2026 | Web | New | | Megafreight megafreight.co.za | Transportation, Logistics, Supply Chain and Storage | 201–500 | ZA | Nov 4, 2026 | Web | New | | klear.co klear.co | — | 2–10 | CO | Nov 3, 2026 | Web | New | | Employee Navigator employeenavigator.com | Software Development | 51–200 | US | Nov 3, 2026 | Web | New | | allnominal.com allnominal.com | — | 2–10 | — | Nov 3, 2026 | Web | New | Showing 12 of 390K+ [See the full list](https://app.incumbently.com/signin) How we know ## Every signal behind the list. Agent scanning · 01 / 78 **MX records** Domain names `Microsoft 365 behind Mimecast`Shows adoption Domain names **9** Subdomains and tenants **7** Certificates **4** Website and app **12** Hiring **8** People **6** Company news **7** Vendors and partners **7** Public records **6** Code and infrastructure **8** Incumbent events **4** Leavers ## Where Slack leavers go. Share of companies that stopped using it and started using a rival in the same period. [Zoom](https://www.incumbently.com/switching/slack-to-zoom) 100% By industry ## Industries. IT Services and IT Consulting 5% Software Development 5% Financial Services 3% Hospitals and Health Care 3% Advertising Services 2% Construction 2% By size ## Company size. 2–10 staff 14% 11–50 staff 17% 51–200 staff 32% 201–500 staff 16% 501–1,000 staff 8% 1,001–5,000 staff 8% 5,001–10,000 staff 2% 10,001+ staff 3% Top countries US**32%** GB**6%** IN**5%** FR**4%** BR**4%** DE**3%** Questions ## Slack usage, answered. Incumbently sees 390K+ companies using Slack as of Nov 6, 2026\. A company counts once we have a dated signal for it, such as a DNS record or website code. 420+ companies started using Slack in the last 90 days, and 1,800+ in the last 12 months. The newest are at the top of the list above. 0 in the last 90 days. Of the leavers we could follow, the most started using Zoom (100%). The biggest industry is IT Services and IT Consulting (5% of companies), and 51–200 staff is the most common company size. Agents read public signals around the clock, such as DNS records, subdomains, website code and job posts. Each company shows the type of signal we found and when. More on Slack [Companies leaving Slack**0** ](https://www.incumbently.com/leaving/slack)[Microsoft Teams vs Slack](https://www.incumbently.com/compare/microsoft-teams-vs-slack)[Slack to Zoom**1** ](https://www.incumbently.com/switching/slack-to-zoom)[Slack vs Zoom](https://www.incumbently.com/compare/slack-vs-zoom)[Webex to Slack**7** ](https://www.incumbently.com/switching/webex-to-slack)[Slack vs Webex](https://www.incumbently.com/compare/slack-vs-webex)[Team communication market share](https://www.incumbently.com/market-share/team-communication) [Companies using All tools we track ](https://www.incumbently.com/companies-using)Related Your turn ## Sell to Slack customers? Track Slack and get an alert the week one of its customers adopts or drops a tool. Start free, no card needed. [Start free](https://app.incumbently.com/signin)[See pricing](https://www.incumbently.com/pricing)