A breakdown of the 2.9K+ companies running One.com Email.
Top industries
Professional and business services429
Art, sports and recreation410
Industrial and manufacturing184
Construction and building179
Information technology and services172
Health and wellness156
Retail trade149
Education and training129
No industry recorded: 572
Company size
1–10463 (53%)
11–50264 (30%)
51–25090 (10%)
251–50017 (2%)
501–1,00011 (1%)
1,001–5,00022 (2%)
5,001–10,0007 (1%)
10,001+6 (1%)
Share of companies with a recorded size, by employees.
No size recorded: 2.1K+
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Frequently asked questions
About the One.com Email data on this page.
How many companies use One.com Email?
Firmable holds confirmed One.com Email detections for 2,992 distinct companies, 2,877 of them confirmed in the last 90 days. A company is counted once however many of its properties run it.
Which companies use One.com Email?
CIGRE, Hydraulico as and mother are among the most prominent in the current set.
What industries use One.com Email?
Professional and business services, art, sports and recreation and industrial and manufacturing lead the set, across 19 industries in total.
What size companies use One.com Email?
Adoption concentrates in the 1-10 employee band, across the companies whose size is recorded.
Where are One.com Email users based?
The United States, Australia, Canada and Singapore account for most detections, across 13 countries.
How current is this data?
2,877 companies were confirmed in the last 90 days. Last detection 13 October 2026.
