The telecommunications companies in North Rhine-Westphalia are a mix of large established players and younger firms, primarily focused on network infrastructure and service provision. Deutsche Telekom, with 67,270 employees, is a global communications and IT company. Deutsche Glasfaser, founded in 2011, builds and operates fiber optic connections in rural areas. 1&1 Versatel provides data, internet, and voice services for businesses, while NetCologne offers full communication services in the Cologne and Bonn regions. Huawei Deutschland, established in 2001, is a global provider of IT and telecommunications solutions.
A notable pattern among these companies is their strong presence in the infrastructure sector, with many specializing in fiber optics, 5G, and network expansion. Düsseldorf is a prominent hub, serving as the headquarters for Deutsche Glasfaser Unternehmensgruppe, 1&1 Versatel, Vantage Towers, and Huawei Deutschland, indicating a concentration of telecommunications activity in that city.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Deutsche Telekomtelekom.com
A leading global communications and information technology company with a diverse team of 206,000 colleagues creating innovative solutions for digital transformation |
67,270 | |||
| 2 |
Deutsche Glasfaser Unternehmensgruppedeutsche-glasfaser.de
Planning, building, and operating open-access fiber optic connections for households, businesses, and public institutions in rural regions. |
1,395 | |||
| 3 |
1&1 Versatel1und1.net
A leading German telecommunications specialist for businesses, providing data, internet, and voice services with a strong focus on expanding their extensive fiber infrastructure |
1,183 | |||
| 4 |
NetColognenetcologne-unternehmen.de
A regional telecommunications company in Cologne and Bonn, Germany, operating its own network and providing full communication services in the area |
958 | |||
| 5 |
Vantage Towersvantagetowers.com
Leading tower company in Europe, connecting people, businesses, and devices through a vast network for faster, greener, and more efficient connectivity |
769 | |||
| 6 |
Deutsche Funkturmdfmg.de
A leading infrastructure provider in Germany, offering services to mobile network operators, broadcasters, and authorities with a focus on LTE and 5G technologies |
600 | |||
| 7 |
vitronet Gruppevitronet.de
Leading provider of telecommunications and energy infrastructure solutions, with over 2,700 employees across 40 locations in Germany Specializing in fiber optic, energy networks, 5G, and more |
529 | |||
| 8 |
Huawei Deutschlandhuawei.com
A global provider of information technology and telecommunications solutions with a focus on connectivity, computing, devices, automotive, digital power, and cloud services |
490 | |||
| 9 |
Gigasetgigaset.com
An internationally active holding company specializing in communication technology, offering cordless phones, smartphones, smart home solutions, and business telephony products |
450 | |||
| 10 |
AMEVIDA SEamevida.de
A leading provider of customer care services in Germany, offering a wide range of future-oriented services in dialog marketing for various industries |
367 | |||
| 11 |
congstarcongstar.de
An innovative and flexible ICT company in Germany, offering a vibrant work environment with a blend of startup culture and corporate security |
365 | |||
| 12 |
MEDIA BROADCAST GmbHmedia-broadcast.com
A leading service provider in Germany's broadcasting and media industry, specializing in digitalization, multimedia transmission platforms, broadcasting, connectivity, and telecommunication services |
326 | |||
| 13 |
Deutsche Telekom Außendienst GmbH
A subsidiary of Deutsche Telekom AG, specializing in telecommunications, IT, and IP products and services for private, business, and carrier customers nationwide |
322 | |||
| 14 | 279 | ||||
| 15 |
STF Gruppestf-gruppe.de
An innovative engineering company providing tailored services in telecommunication, digitalization, IT, and technical building planning with 500+ employees across 18 locations nationwide |
256 | |||
| 16 |
Triopt Grouptriopt-group.de
TRIOPT GmbH provides technical services for planning, implementing, and optimizing wireless and fixed networks for mobile operators and system suppliers |
217 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 17 |
Insyte Deutschland GmbHinsytedeutschland.de
Providing high-quality installation, operation, and maintenance services for network infrastructures across various sectors with tailored end-to-end solutions. |
183 | |||
| 18 |
GlasfaserPlus GmbHglasfaserplus.de
Bringing fast and reliable internet to rural areas to ensure digital inclusion for all, striving to make it as essential as water and electricity |
179 | |||
| 19 |
Circet Deutschland SEcircet.de
A leading telecommunications infrastructure provider with over 15,000 employees across multiple countries, specializing in turnkey projects, E-Mobility, and mobile network construction |
178 | |||
| 20 |
mobilezone Deutschlandmobilezone.org
A leading e-commerce company in the telecommunications sector, specializing in mobile phone offers with pay monthly contracts and fast, secure dispatch of goods |
166 | |||
| 21 |
ecotel communication agecotel.de
A company specializing in business networking and innovation, preparing businesses for the digital workplace and helping them achieve their goals |
161 | |||
| 22 |
TÜV Rheinland LGA Products GmbH
Global service provider offering independent expertise in quality, safety for people, environment, and technology Trusted for ensuring superior standards |
155 | |||
| 23 |
Nothelle Call Center Services GmbHnothelle.de
A communication service provider facilitating meaningful dialogues between renowned companies and customers to build long-lasting relationships, emphasizing employee growth and success |
151 | |||
| 24 |
Westconnectwestconnect.de
The company specializes in laying fiber optic networks in western Germany, providing fast internet services to households and businesses |
148 | |||
| 25 |
Bureau Veritas CPS Technology (former 7layers)7layers.com
An international testing, certifying, and consulting service provider specializing in wireless technologies for various industries, offering a range of services and smart solutions |
104 | |||
| 26 |
CPI VERTEX ANTENNENTECHNIK GmbHvertexant.com
Designing, manufacturing, and constructing precision antennas and antenna systems, including commercial transactions for satellite communication products with worldwide delivery. |
65 | |||
| 27 |
Huawei Cloud Europehuaweicloud.com
A company offering a wide range of services through cloud technology, providing solutions for various needs |
56 | |||
| 28 |
telegra GmbHtelegra.com
This company specializes in providing solutions for professional customer communication, including dialog systems, plug-ins, interfaces, and APIs to enhance customer interaction and streamline processes |
42 | |||
| 29 |
HUBER+SUHNER BKtel GmbHbktel.com
Development and supply of advanced broadband communication components and services including network planning, installation, and training for efficient network operation. |
39 | |||
| 30 |
Apelbyapelby.com
A global telecommunications provider offering voice, data, messaging, and outsourcing services with a strong presence in key regions worldwide |
31 | |||
| 31 |
CALLAX Holding GmbHcallax.net
A leading European telecommunications company offering innovative solutions and services in Germany, France, Spain, and the United Kingdom, focusing on customer value and satisfaction |
16 | |||
| 32 |
TMTkom GmbHtmtkom.de
A growing trade and craft business with over 200 employees, specializing in telecommunications, network-based technology, and multimedia connections, prioritizing quality and customer satisfaction |
15 | |||
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 14, 2026.
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