Most-Used Email by UK Companies (2026)
Across 1,485 UK companies with a detectable email system, Campaign Monitor leads with 33.3% market share (495 companies).
Email coverage is sparse against the full UK company base: 1,485 companies have a detectable Email system, out of 2,066,481 trading UK companies. Within that detected group, Campaign Monitor has the largest share at 33.3% (495), followed by follow.it at 19.4% (288) and Constant Contact at 19.1% (283).
Read more
Campaign Monitor leads in every employee band shown, with 32.1% among Under 10 employees, 34.9% among 10–50 employees, and 39.3% among Over 50 employees. The pattern suggests a market where one system is used across company sizes, while the next two sit close together overall.
Four other systems make up the visible long tail: Creativ.eMail at 12.8% (190), Zoho Campaigns at 5.7% (85), Flodesk at 5.5% (82), and EmailJS at 4.6% (68). That tail is not especially fragmented, given only 7 systems are detected.
1,485
Companies with detected Email
Of 2,066,481 UK companies
0.1%
Detection rate
2026
7
Systems detected
In this category
33.3%
Leader share
Campaign Monitor
UK companies Email market share
Share of the 1,485 UK companies with a detectable system. As of June 2026.
Email compared
| System | UK companies | Share | Median headcount | London share | Typical profile |
|---|---|---|---|---|---|
| Campaign Monitor | 489 | 32.9% | 7 | 18.6% | 7-headcount firms, 33.3% share |
| follow.it | 286 | 19.3% | 8 | 16% | 8-headcount firms, 19.4% share |
| Constant Contact | 284 | 19.1% | 6 | 23.7% | 6-headcount firms, 19.1% share |
| Creativ.eMail | 190 | 12.8% | — | — | Buy these companies as a spreadsheet → |
| Zoho Campaigns | 85 | 5.7% | — | — | Buy these companies as a spreadsheet → |
| Flodesk | 82 | 5.5% | — | — | Buy these companies as a spreadsheet → |
| EmailJS | 68 | 4.6% | — | — | Buy these companies as a spreadsheet → |
Systems detected below the page threshold appear with counts only; their full lists are available in the Firmbase app.
Market leader by size
The leading Email system shifts with company size: among UK companies with under 10 employees, Campaign Monitor leads at 32.1% of the 934 with a detectable system; among UK companies with 10–50 employees, Campaign Monitor leads at 34.9% of the 495 with a detectable system; and among UK companies with over 50 employees, Campaign Monitor leads at 39.3% of the 56 with a detectable system.
Under 10 employees
32.1% of band
Under 10 employees is the largest detected band, with 934 companies. Campaign Monitor leads with 32.1%, while the remainder is split across smaller email and newsletter tools.
10–50 employees
34.9% of band
10–50 employees contains 495 companies and still has Campaign Monitor in front, at 34.9%. This mid-sized band has enough volume for the second and third systems to matter, but not enough to displace the main leader.
Over 50 employees
39.3% of band
Over 50 employees is a small detected group, with 56 companies. Campaign Monitor’s 39.3% share is higher here than in the smaller bands.
How Email usage is detected
Company data
Detected companies are joined to UK Companies House records and XBRL accounts data. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Detection
Firmbase crawls the public website of actively-trading UK companies and fingerprints the technologies present: tracking scripts, embedded forms, chat widgets, CMS markers and similar signatures. A company is included in this list when one or more of the technology's signatures are found on its site; closely-related variants of the same product are grouped under one name. Detection covers what is visible on the public web — a company using the technology purely internally, with no website footprint, will not appear. Counts are therefore a conservative floor, not a ceiling.
Freshness
Websites are re-crawled on a rolling basis and the underlying company data is refreshed from Companies House continuously; filings appear within days of submission. The list and its statistics are regenerated when the detected cohort moves meaningfully. You can see the last-updated timestamp near the top of the page.
All product names are trademarks of their respective owners. Firmbase is not affiliated with, sponsored by, or endorsed by any trademark owner.
UK companies by Email
Related directories
Frequently asked questions
What is the most-used Email among UK companies?
How many UK companies have a detectable Email?
What is a Email?
How is Email usage detected?
Which has more UK companies, Campaign Monitor or follow.it?
What is the best Email for UK companies?
Buy all 1,485 companies as a spreadsheet.
One Excel/CSV file with company details, websites and key data — yours to download and use.