A breakdown of the 346K+ companies running Mailcheck.
Top industries
Professional and business services46K+
Construction and building33K+
Art, sports and recreation30K+
Health and wellness25K+
Information technology and services19K+
Industrial and manufacturing17K+
Education and training15K+
Financial services14K+
No industry recorded: 58K+
Company size
1–1075,058 (55%)
11–5034,584 (25%)
51–25020,293 (15%)
251–5004,080 (3%)
501–1,000712 (1%)
1,001–5,0001,009 (1%)
5,001–10,000115 (<1%)
10,001+133 (<1%)
Share of companies with a recorded size, by employees.
No size recorded: 210K+
Versions detected
9 versions across the confirmed companies. Counts are distinct companies seen running that version.
1.1.2332
3.6.29
3.6.13
3.6.33
17.4.101
2.3.31
3.5.01
7.1.21
7.1.31
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Frequently asked questions
About the Mailcheck data on this page.
How many companies use Mailcheck?
Firmable holds confirmed Mailcheck detections for 346,098 distinct companies, 235,796 of them confirmed in the last 90 days. A company is counted once however many of its properties run it.
Which companies use Mailcheck?
Stark Tech, New Mountain Capital and Burke, Inc. are among the most prominent in the current set.
What industries use Mailcheck?
Professional and business services, construction and building and art, sports and recreation lead the set, across 19 industries in total.
What size companies use Mailcheck?
Adoption concentrates in the 1-10 employee band, across the companies whose size is recorded.
Where are Mailcheck users based?
The United States, Australia, Canada and Japan account for most detections, across 13 countries.
How current is this data?
235,796 companies were confirmed in the last 90 days. Last detection 14 October 2026.
