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Observations captured every day, across DNS records, public service scans and websites.
75,317
Technologies tracked, each matched to the companies running them and who to call.
Companies using ChatGPT Custom Domains
Showing 5 of 13K+ companies
AMPP: Association for Materials Protection and Performance
ampp.org · Charitable and community organisations · 251–500 employees · 2 web properties observed
Last seen 12 Oct 2026
The most recent date Firmable detected ChatGPT Custom Domains at this company.
Decision makers · 94 on fileSenior people on file at this company. Firmable holds their names, emails and mobiles.
Vice President of Civil InfrastructureMobileEmail
Director of Technology, Digital Experience, and Data ServicesMobileEmail
Unlock names, emails and mobiles in the trial.
Signals Recent events at this company, such as a leadership change, funding or a new office.
AMPP announced approaching deadlines for its $50,000 research grant focused on ammonia as a marine fuel. · 11 Sep 2026
AMPP International is launching the Carbon Capture, Utilization, and Storage (CCUS): Materials Selection and Corrosion Control eCourse in Texas on Oct 1st '26 · 1 Oct 2026
A breakdown of the 13K+ companies running ChatGPT Custom Domains.
Top industries
Professional and business services2.3K+
Art, sports and recreation1.2K+
Information technology and services1.2K+
Construction and building1.2K+
Real estate and home services753
Financial services655
Hospitality and travel644
Health and wellness629
No industry recorded: 1.4K+
Company size
1–103,414 (65%)
11–501,195 (23%)
51–250512 (10%)
251–50089 (2%)
501–1,00020 (<1%)
1,001–5,00037 (1%)
5,001–10,0004 (<1%)
10,001+7 (<1%)
Share of companies with a recorded size, by employees.
No size recorded: 8.1K+
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Frequently asked questions
About the ChatGPT Custom Domains data on this page.
How many companies use ChatGPT Custom Domains?
Firmable holds confirmed ChatGPT Custom Domains detections for 13,465 distinct companies, 13,465 of them confirmed in the last 90 days. A company is counted once however many of its properties run it.
Which companies use ChatGPT Custom Domains?
AMPP: Association for Materials Protection and Performance, eGenesis and AE Global are among the most prominent in the current set.
What industries use ChatGPT Custom Domains?
Professional and business services, art, sports and recreation and information technology and services lead the set, across 19 industries in total.
What size companies use ChatGPT Custom Domains?
Adoption concentrates in the 1-10 employee band, across the companies whose size is recorded.
Where are ChatGPT Custom Domains users based?
The United States, Canada, Australia and Japan account for most detections, across 13 countries.
How current is this data?
13,465 companies were confirmed in the last 90 days. Last detection 13 October 2026.
