Share of companies with a recorded size, by employees.
No size recorded: 18
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Frequently asked questions
About the Tellabs data on this page.
How many companies use Tellabs?
Firmable holds confirmed Tellabs detections for 155 distinct companies, 19 of them confirmed in the last 90 days. A company is counted once however many of its properties run it.
Which companies use Tellabs?
Fortress Solutions (Formerly Restor Telecom, Inc.), Mastech InfoTrellis and Shields Environmental are among the most prominent in the current set.
What industries use Tellabs?
Information technology and services, media and telecommunications and professional and business services lead the set, across 16 industries in total.
What size companies use Tellabs?
Adoption concentrates in the 251-500 employee band, across the companies whose size is recorded.
Where are Tellabs users based?
The United States, Canada, Australia and the Philippines account for most detections, across 13 countries.
How current is this data?
19 companies were confirmed in the last 90 days. Last detection 19 September 2026.
