Company lists · Data refreshed September 2026

Top 25 Telecommunication engineering firms worldwide

Name: Telecommunication engineering firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 21,002 companies tracked

RevenueBase identified 21,002 telecommunication engineering firms worldwide as of September 2026 and tracks 355,776 professional contacts across them, including 67,268 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers telecommunication engineering firms worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 30, 2026. Country and city lists for telecommunication engineering firms follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 30, 2026 86% judged on-target in blind review

21,002Companies

355,776Contacts tracked

67,268Verified emails

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The 25 largest telecommunication engineering firms worldwide

Ranked by team size

Top 25 of 21,002 telecommunication engineering firms worldwide, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to telecommunication engineering firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Serede	Indirect evidence	Rio De Janeiro, BrazilHQ checked Sep 30, 2026	10001+	8,011 contacts →
	Indirect evidence “A Serede é uma empresa prestadora de serviços de implantação e manutenção em redes de Telecom, fundada em 06 de agosto de 2007.” Source: RevenueBase Database · checked Sep 30, 2026
2	Circet	Indirect evidence	Paris, FranceHQ checked Sep 30, 2026	10001+	3,901 contacts →
	Indirect evidence “A global player in the telecom infrastructure services industry, the Circet Group provides operators, local authorities and key accounts throughout the world with an integrated…” Source: RevenueBase Database · checked Sep 30, 2026
3	Mastec Communications Group	Indirect evidence	Coral Gables, FL, United StatesHQ checked Sep 30, 2026	5,001-10,000	3,207 contacts →
	Indirect evidence “MasTec Communications Group (MCG) is a division of MasTec that provides comprehensive services and turnkey solutions for Telecom operators.” Source: RevenueBase Database · checked Sep 30, 2026
4	Automated Systems Design, INC	Indirect evidence	Alpharetta, GA, United StatesHQ checked Sep 30, 2026	n/a	2,678 contacts →
	Indirect evidence “Since 1987, Automated Systems Design, Inc.(ASD®) a five-time Inc.” Source: RevenueBase Database · checked Sep 30, 2026
5	Procisa DO Brasil	Indirect evidence	São Paulo, BrazilHQ checked Sep 30, 2026	1,001-5,000	2,538 contacts →
	Indirect evidence “Prazer, somos a Procisa do Brasil!” Source: RevenueBase Database · checked Sep 30, 2026
6	Sielte SPA	Indirect evidence	Rome, ItalyHQ checked Sep 30, 2026	1,001-5,000	2,448 contacts →
	Indirect evidence “Oltre Persone, distribuite su 21 Centri Operativi in tutta Italia, che ogni giorno installano, collaudano, gestiscono il commissioning e le manutenzioni, progettano, implementano…” Source: RevenueBase Database · checked Sep 30, 2026
7	Sirti S.P.A	Indirect evidence	Sesto San Giovanni (mi), ItalyHQ checked Sep 30, 2026	1,001-5,000	2,332 contacts →
	Indirect evidence “Sirti is Italy's leading technology company in the design and production of network infrastructures and telecoms system integration.” Source: RevenueBase Database · checked Sep 30, 2026
8	Sogetrel	Indirect evidence	Issy Les Moulineaux, FranceHQ checked Sep 30, 2026	1,001-5,000	2,285 contacts →
	Indirect evidence “En première ligne de la transformation numérique des entreprises et des territoires, le Groupe Sogetrel est spécialisé dans les services aux infrastructures numériques et…” Source: RevenueBase Database · checked Sep 30, 2026
9	LCC	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 30, 2026	5,001-10,000	2,193 contacts →
	Indirect evidence “In Feb.” Source: RevenueBase Database · checked Sep 30, 2026
10	Infinera	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 30, 2026	1,001-5,000	1,959 contacts →
	Indirect evidence “Infinera is now part of Nokia.” Source: RevenueBase Database · checked Sep 30, 2026
11	Grupo RCS	Indirect evidence	Brasilia, BrazilHQ checked Sep 30, 2026	5,001-10,000	1,810 contacts →
	Indirect evidence “A RCS é uma empresa de Engenharia especializada em oferecer serviços técnicos de missão crítica com alta tecnologia aplicada, para clientes que necessitam manter suas atividades…” Source: RevenueBase Database · checked Sep 30, 2026
12	IES Communications	Indirect evidence	Tempe, AZ, United StatesHQ checked Sep 30, 2026	1,001-5,000	1,800 contacts →
	Indirect evidence “IES Communications a division of IES (NASDAQ: IESC) provides each client with a team of highly qualified dedicated professionals that deliver superior quality and cost effective…” Source: RevenueBase Database · checked Sep 30, 2026
13	Camusat	Indirect evidence	Paris, FranceHQ checked Sep 30, 2026	1,001-5,000	1,726 contacts →
	Indirect evidence “Camusat is one of the market leaders in the implementation of telecom infrastructures and one of the most experienced network developers.” Source: RevenueBase Database · checked Sep 30, 2026
14	PT Berca Hardayaperkasa	Indirect evidence	Jakarta Pusat, IndonesiaHQ checked Sep 30, 2026	1,001-5,000	1,701 contacts →
	Indirect evidence “Since its establishment in 1990, PT.” Source: RevenueBase Database · checked Sep 30, 2026
15	Telecon	Indirect evidence	Montreal, QC, CanadaHQ checked Sep 30, 2026	1,001-5,000	1,573 contacts →
	Indirect evidence “From a regional telecom networks builder in 1967 in Quebec (Canada), Telecon has grown into a world-class industry-leading telecom networks design, infrastructure and connectivity…” Source: RevenueBase Database · checked Sep 30, 2026
16	Pt. Mora Telematika Indonesia TBK	Partial evidence	Jakarta Pusat, IndonesiaHQ checked Sep 30, 2026	1,001-5,000	1,510 contacts →
	Partial evidence “Moratelindo is part of PT Ekamas Mora RepublikTbk (MoraRepublic), one of Indonesia’s largest integrated infrastructure Telecommunication and connectivity providers.” Source: RevenueBase Database · checked Sep 30, 2026
17	Tulip Telecom	Indirect evidence	New Delhi, IndiaHQ checked Sep 30, 2026	1,001-5,000	1,481 contacts →
	Indirect evidence “Tulip Telecom Ltd.(BSE: 532691/NSE: TULIP) is India’s leading Enterprise Communications Service provider.” Source: RevenueBase Database · checked Sep 30, 2026
18	Sofrecom Tunisie	Indirect evidence	Tunis, TunisiaHQ checked Sep 30, 2026	1,001-5,000	1,397 contacts →
	Indirect evidence “Sofrecom, filiale du groupe France Télécom - Orange, a développé depuis plus de 45 ans un savoir-faire unique dans les métiers de l’opérateur, qui en fait aujourd’hui l’un des…” Source: RevenueBase Database · checked Sep 30, 2026
19	Aerial Telecom Solutions	Indirect evidence	Mohali, IndiaHQ checked Sep 30, 2026	5,001-10,000	1,388 contacts →
	Indirect evidence “Aerial Telecom Solutions Private Limited is a global systems integrator and technology partner, driving next-generation connectivity and digital transformation across diverse…” Source: RevenueBase Database · checked Sep 30, 2026
20	Italtel	Indirect evidence	Milan, GermanyHQ checked Sep 30, 2026	1,001-5,000	1,279 contacts →
	Indirect evidence “We help our customers to choose the most suitable solutions for the characteristics of their business, to develop the traditional communication technologies they already have in…” Source: RevenueBase Database · checked Sep 30, 2026
21	Wachter, INC	Indirect evidence	Lenexa, KS, United StatesHQ checked Sep 30, 2026	1,001-5,000	1,237 contacts →
	Indirect evidence “Wachter is on the cutting-edge of technology and infrastructure installation and has been since 1930.” Source: RevenueBase Database · checked Sep 30, 2026
22	ZENER	Indirect evidence	Madrid, SpainHQ checked Sep 30, 2026	5,001-10,000	1,207 contacts →
	Indirect evidence “En Zener crecemos acelerando el crecimiento de nuestros clientes.” Source: RevenueBase Database · checked Sep 30, 2026
23	Cablex AG	Indirect evidence	Muri Bei Bern, SwitzerlandHQ checked Sep 30, 2026	1,001-5,000	1,091 contacts →
	Indirect evidence “Connected for the future with cablex.” Source: RevenueBase Database · checked Sep 30, 2026
24	CCI Systems	Strong evidence	Iron Mountain, MI, United StatesHQ checked Sep 30, 2026	1,001-5,000	1,077 contacts →
	Strong evidence “CCI Systems is an employee-owned solution provider specializing in telecommunications, comprehensive network assessments, industry-leading engineering, drafting and design…” Source: RevenueBase Database · checked Sep 30, 2026
25	Kelly Group	Indirect evidence	Wembley, United KingdomHQ checked Sep 30, 2026	1,001-5,000	1,053 contacts →
	Indirect evidence “Established in 1985 to support the emerging UK cable television market, Kelly Group has diversified to meet the needs of our clients.” Source: RevenueBase Database · checked Sep 30, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: telecommunication engineering firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names telecommunication engineering firms.
Partial evidence: Its own public description names part of telecommunication engineering firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name telecommunication engineering firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 21,002 telecommunication engineering firms worldwide

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Telecommunication engineering firms worldwide at a glance

As of Sep 30, 2026

18.9%Verified-email coverage

16.9Average contacts per company

11-50Median size (employees)

1.6%Largest-city concentration · Sao Paulo

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

9,128

11-50

7,955

51-200

2,650

201-500

699

501-1,000

250

1,001-5,000

149

5,001-10,000

10001+

Email recency is reported on each country list linked below.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among telecommunication engineering firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
Coverage: Every country. Country and city lists for telecommunication engineering firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “telecommunication engineering firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names telecommunication engineering firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among telecommunication engineering firms, and records with no verified work email.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 67,268 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 30, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Telecommunication engineering firms by location

105 lists · largest first

Every Telecommunication engineering firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names telecommunication engineering firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many telecommunication engineering firms are there worldwide?

RevenueBase identified 21,002 telecommunication engineering firms worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Serede, headquartered in Rio De Janeiro, tops this list with the largest team on record.

Which country has the most telecommunication engineering firms?

The United States leads with 3,829 companies, followed by Brazil (1,338) and the United Kingdom (1,102). Every telecommunication engineering firms list by country and city is linked on this page.

Which city has the most telecommunication engineering firms?

Sao Paulo leads with 327 headquartered companies, followed by London (135) and Tehran (124).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 67,268 verified decision-maker contacts tracked across these 21,002 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 30, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.