Email Used by UK B2B Companies: Market Share (2026)
Email systems are detected at 830 of 112,345 trading UK B2B companies, with Campaign Monitor ahead on 32.5% of detections (270 companies).
Among 112,345 trading UK B2B companies, 830 have a detectable Email system. Usage is spread across 7 systems, with Campaign Monitor at 32.5% (270), Constant Contact at 20.2% (168), and follow.it at 18.3% (152).
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The market is small-company weighted. Campaign Monitor has the largest share in each employee band: 31.5% of 517 companies under 10 employees, 33.0% of 279 companies with 10–50 employees, and 44.1% of 34 companies over 50 employees.
The tail is still visible rather than fragmented beyond recognition. Creativ.eMail accounts for 13.3% (110), followed by Zoho Campaigns at 6.9% (57), EmailJS at 5.8% (48), and Flodesk at 3.5% (29).
830
B2B with detected Email
Of 112,345 UK B2B
0.7%
Detection rate
2026
7
Systems detected
In this category
32.5%
Leader share
Campaign Monitor
UK B2B Email market share
Share of the 830 UK B2B with a detectable system. As of June 2026.
Email compared
| System | UK B2B | Share | Median headcount | London share | Typical profile |
|---|---|---|---|---|---|
| Campaign Monitor | 270 | 32.5% | 7 | 20.4% | Small firms, median headcount 7 |
| Constant Contact | 168 | 20.2% | 6 | 22.6% | Small firms, median headcount 6 |
| follow.it | 152 | 18.3% | 8 | 15.8% | Small firms, median headcount 8 |
| Creativ.eMail | 110 | 13.3% | 6 | 29.1% | Small firms, median headcount 6 |
| Zoho Campaigns | 57 | 6.9% | 9 | 17.5% | Small firms, median headcount 9 |
| EmailJS | 48 | 5.8% | — | — | View these companies in Firmbase → |
| Flodesk | 29 | 3.5% | — | — | View these companies in Firmbase → |
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 B2B with under 10 employees, Campaign Monitor leads at 31.5% of the 517 with a detectable system; among UK B2B with 10–50 employees, Campaign Monitor leads at 33% of the 279 with a detectable system; and among UK B2B with over 50 employees, Campaign Monitor leads at 44.1% of the 34 with a detectable system.
Under 10 employees
31.5% of band
Under 10 employees is the largest band, with 517 detected companies. Campaign Monitor has the largest share at 31.5%, while Constant Contact, follow.it, and Creativ.eMail make up much of the visible competition.
10–50 employees
33% of band
10–50 employees includes 279 detected companies, still mostly small and mid-sized B2B operators. Campaign Monitor accounts for 33.0%, with Constant Contact and follow.it forming the next tier.
Over 50 employees
44.1% of band
Over 50 employees is a much smaller band, with 34 detected companies. Campaign Monitor’s share rises to 44.1%, suggesting more concentration among larger detected users.
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 B2B by Email
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Frequently asked questions
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