A breakdown of the 7.5K+ companies running Substack.
Top industries
Professional and business services1.5K+
Information technology and services1K+
Media and telecommunications821
Education and training499
Financial services443
Art, sports and recreation405
Health and wellness250
Not for profit198
No industry recorded: 1.6K+
Company size
1–102,631 (53%)
11–501,232 (25%)
51–250630 (13%)
251–500148 (3%)
501–1,00074 (1%)
1,001–5,000140 (3%)
5,001–10,00031 (1%)
10,001+49 (1%)
Share of companies with a recorded size, by employees.
No size recorded: 2.6K+
One dataset. Four ways to sell.
Match the deepest technology intelligence against the most comprehensive data on companies and people – such as who is growing, raised capital or changed role – for pinpoint precision on GTM campaigns.
Competitor displacement
Find the accounts running a competitor today and go after them with the right argument.
Complementary tools
Target companies whose stack sits alongside yours and integrates without a fight.
Service partners
Identify implementers and agencies already working in the technologies you support.
Market insights
Map your total addressable market and track aggregated trends such as AI maturity.
Frequently asked questions
About the Substack data on this page.
How many companies use Substack?
Firmable holds confirmed Substack detections for 7,574 distinct companies, 5,404 of them confirmed in the last 90 days. A company is counted once however many of its properties run it.
Which companies use Substack?
FIGS, Rothy's and Acceleration Partners are among the most prominent in the current set.
What industries use Substack?
Professional and business services, information technology and services and media and telecommunications lead the set, across 19 industries in total.
What size companies use Substack?
Adoption concentrates in the 1-10 employee band, across the companies whose size is recorded.
Where are Substack users based?
The United States, Canada, Australia and Singapore account for most detections, across 13 countries.
How current is this data?
5,404 companies were confirmed in the last 90 days. Last detection 14 October 2026.
