These German telecommunications companies include large groups and mid-sized firms. They cover a range of activities, from network infrastructure and connectivity solutions to customer services and digital transformation. Deutsche Telekom is a global communications and IT company, while Rohde & Schwarz offers test, measurement, and cybersecurity solutions. Telefónica Germany focuses on digital experiences, and 1&1 Telecommunication SE provides mobile and broadband services.
The companies listed show a strong presence in major German cities. Düsseldorf, for example, is home to Deutsche Glasfaser Unternehmensgruppe, 1&1 Versatel, and Vantage Towers, all involved in fiber optic infrastructure and network services. This indicates a concentration of network development and operational expertise in the region.
| # | 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 |
Rohde & Schwarzrohde-schwarz.com
Technology group creates innovations, empowers industrial, regulatory, and military customers with test, measurement, and cybersecurity solutions, pushing boundaries in AI, 6G, cloud. |
9,600 | |||
| 3 |
Telefónica Germanytelefonica.de
The company enables digital experiences anytime, anywhere, supporting customers with innovative products and services to accelerate digital transformation |
4,055 | |||
| 4 |
Rosenberger Grouprosenberger.com
Manufacturing impedance-controlled and optical connectivity solutions for high-frequency, high-voltage, and fiber-optic applications across diverse high-tech industries worldwide. |
1,597 | |||
| 5 |
1&1 Telecommunication SE1und1.de
Innovative German telecommunications provider with leading market positions in mobile and broadband services, boasting an extensive fiber network and pioneering 5G technology |
1,508 | |||
| 6 |
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 | |||
| 7 |
EWE TEL GmbHewe.com
The company is a regional telecommunications provider in Germany offering internet, mobile, fixed-line, TV, and business solutions to customers |
1,372 | |||
| 8 |
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 | |||
| 9 |
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 | |||
| 10 |
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 | |||
| 11 |
RFS - Radio Frequency Systemsrfsworld.com
Design and manufacture of advanced RF cables, connectors, antennas, and conditioning products supporting 5G, small cells, and smart city networks. |
751 | |||
| 12 |
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 | |||
| 13 |
PŸUR | Tele Columbustelecolumbus.com
A leading German fiber network operator providing high-speed internet, phone, TV services, and custom fiber solutions to residential and business customers nationwide |
581 | |||
| 14 |
Avedo Gelsenkirchen GmbHavedo.de
Offers comprehensive digital customer service with a wide range of services, providing 360-degree consulting to help clients innovate in customer dialogue for market advantage. |
564 | |||
| 15 |
LHS Telekommunikationlhs-systems.com
A global provider of telecom billing and customer care systems, offering innovative solutions for a wide range of services and business models |
552 | |||
| 16 |
M-net Telekommunikations GmbHm-net.de
Provides secure communication technology including voice, data, mobile, fixed-line, network solutions, and national/international radio and TV services. |
538 | |||
| 17 |
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 | |||
| 18 |
PROSE Technologiesprosetechnologies.com
The company designs and builds technologies to connect people globally, ensuring communication without interruption, allowing connectivity to work, family, and beyond |
504 | |||
| 19 |
NFON AGcorporate.nfon.com
A leading pan-European provider of cloud-based telephone systems, NFON AG offers modern communication solutions for businesses, focusing on simplicity and innovation |
501 | |||
| 20 |
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 | |||
| 21 |
KiKxxl GmbHkikxxl.de
A leading contact center in Northern Germany offering various communication services with over 2,800 employees across multiple locations |
482 | |||
| 22 | 463 | ||||
| 23 |
Gigasetgigaset.com
An internationally active holding company specializing in communication technology, offering cordless phones, smartphones, smart home solutions, and business telephony products |
450 | |||
| 24 |
Deutsche GigaNetz GmbHdeutsche-giganetz.de
Established in 2020 with the goal of providing households with fiber optic connections, focusing on long-term quality service for residential, commercial, and carrier customers |
448 | |||
| 25 |
freenet AGfreenet.ag
Largest independent telecommunications provider in Germany offering mobile voice and data services with a focus on stakeholder responsibility. |
430 | |||
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. | |||||
| 26 |
Coriant, Inc.nokia.com
Innovative networking solutions for cloud-centric businesses, scaling capacity, reducing operational complexity, and enabling new generation mobile, video, and cloud services |
418 | |||
| 27 |
freenet DLS GmbHfreenet.de
The company offers a variety of telecommunications services including mobile phones, internet, TV entertainment, and accessories |
377 | |||
| 28 |
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 | |||
| 29 |
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 | |||
| 30 |
CTDI Europectdi.eu
A leader in communications, mobility, and consumer devices service industries, offering logistics, testing, repair, refurbishment services, and career opportunities |
339 | |||
| 31 |
Mynaricmynaric.com
Leading the industrial revolution of laser communications, producing optical communication terminals for air, space, and mobile applications globally Headquarters in Munich |
334 | |||
| 32 |
Unsere Grüne Glasfaserunseregrueneglasfaser.de
A German company specializing in providing high-speed internet through FTTH connections in rural areas, offering open access to their network for internet service providers |
333 | |||
| 33 |
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 | |||
| 34 |
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 | |||
| 35 |
freenet Shop GmbHfreenet-digital.de
mobilcom-debitel offers a wide range of mobile, data, energy, and accessory products and services through 550 shops with 1,500 advisors Franchise opportunities available |
297 | |||
| 36 | 279 | ||||
| 37 |
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 | |||
| 38 |
brodosbrodos.com
Supplier and operator offering mobile devices, tariffs, and services, partnering with manufacturers and network providers for diverse customers. |
236 | |||
| 39 |
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 | |||
| 40 |
telent GmbHtelent.de
The company provides tailored technology solutions and services for Critical Infrastructures, Digitalization, and Industry 40, specializing in Cybersecurity, IP networks, IoT, and more |
217 | |||
| 41 |
The Phone House Telecom GmbHphonehouse.de
Phone House in Germany is a mobile communication retailer, managing franchise shops, stores for Deutsche Telekom and Samsung, and online sales |
204 | |||
| 42 |
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 | |||
| 43 |
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 | |||
| 44 |
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 | |||
| 45 |
WISI Groupwisigroup.com
A global pioneer in receiving and distributing technology, specializing in CATV, reception, mobile communication, and high-frequency assemblies to optimize network efficiency |
177 | |||
| 46 |
GVG Glasfasergvg-glasfaser.de
The company plans, builds, and operates fiber optic networks to connect businesses and households, focusing on improving broadband access in rural areas |
172 | |||
| 47 |
Ströer X GmbHstroeer-x.de
Ströer X GmbH provides outsourcing services for sales and customer services, enhancing customer satisfaction, saving time, and allowing clients to focus on core activities |
167 | |||
| 48 |
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 | |||
| 49 |
SPIE comcross GmbHcomcross.de
Development and expansion of intelligent communication infrastructure supporting digital transformation and connecting people with the world through innovative technology. |
165 | |||
| 50 |
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 | |||
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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 12, 2026.
More company lists in Germany
- The largest companies in Germany 15,224
- Multinational companies in Germany 4,800
- Companies with in-house R&D in Germany 2,450
- Manufacturers in Germany 1,957
- Software Development companies in Germany 1,401
- SaaS companies in Germany 1,389
- Retail chains in Germany 1,383
- Family-owned companies in Germany 1,330
- Hardware manufacturers in Germany 1,316
- Critical infrastructure operators in Germany 1,305
- Financial services firms in Germany 1,265
- Transportation, Logistics, Supply Chain and Storage companies in Germany 1,145
- Companies with a mobile app in Germany 928
- IT Services and IT Consulting companies in Germany 911
- Corporate groups and holding companies in Germany 832
- Public sector organisations in Germany 812
- IT services companies in Germany 776
- Financial Services companies in Germany 745
- Professional services firms in Germany 690
- Logistics companies in Germany 597
- Consulting firms in Germany 584
- Automotive manufacturers and suppliers in Germany 504
- Banking companies in Germany 485
- Machinery Manufacturing companies in Germany 476