# The 50 largest Telecommunications companies in Germany

Tamtam tracks 80 Telecommunications companies headquartered in Germany. This list ranks the 50 largest by number of employees on LinkedIn, led by Deutsche Telekom, Rohde & Schwarz and Telefónica Germany. Their median headcount is 430. Half of them were founded in 2002 or later. The most common headquarters are Cologne (6), Munich (6) and Düsseldorf (5).

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.

🇩🇪 Germany · 50 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Deutsche Telekom](https://www.tamtam.ai/c/deutsche-telekom) (telekom.com)<br>A leading global communications and information technology company with a diverse team of 206,000 colleagues creating innovative solutions for digital transformation | Telecommunications | 🇩🇪 Bonn | 67,270 |  |
| 2 | [Rohde & Schwarz](https://www.tamtam.ai/c/rohde-and-schwarz) (rohde-schwarz.com)<br>Technology group creates innovations, empowers industrial, regulatory, and military customers with test, measurement, and cybersecurity solutions, pushing boundaries in AI, 6G, cloud. | Telecommunications | 🇩🇪 Munich | 9,600 | 1933 |
| 3 | [Telefónica Germany](https://www.tamtam.ai/c/telefonica-germany) (telefonica.de)<br>The company enables digital experiences anytime, anywhere, supporting customers with innovative products and services to accelerate digital transformation | Telecommunications | 🇩🇪 Munich | 4,055 | 1995 |
| 4 | [Rosenberger Group](https://www.tamtam.ai/c/rosenberger-group) (rosenberger.com)<br>Manufacturing impedance-controlled and optical connectivity solutions for high-frequency, high-voltage, and fiber-optic applications across diverse high-tech industries worldwide. | Telecommunications | 🇩🇪 Fridolfing | 1,597 | 1958 |
| 5 | [1&1 Telecommunication SE](https://www.tamtam.ai/c/1-and-1-telecommunication-se) (1und1.de)<br>Innovative German telecommunications provider with leading market positions in mobile and broadband services, boasting an extensive fiber network and pioneering 5G technology | Telecommunications | 🇩🇪 Montabaur | 1,508 |  |
| 6 | [Deutsche Glasfaser Unternehmensgruppe](https://www.tamtam.ai/c/deutsche-glasfaser-unternehmensgruppe) (deutsche-glasfaser.de)<br>Planning, building, and operating open-access fiber optic connections for households, businesses, and public institutions in rural regions. | Telecommunications | 🇩🇪 Düsseldorf | 1,395 | 2011 |
| 7 | [EWE TEL GmbH](https://www.tamtam.ai/c/ewe-tel-gmbh) (ewe.com)<br>The company is a regional telecommunications provider in Germany offering internet, mobile, fixed-line, TV, and business solutions to customers | Telecommunications | 🇩🇪 Oldenburg | 1,372 |  |
| 8 | [1&1 Versatel](https://www.tamtam.ai/c/1-and-1-versatel) (1und1.net)<br>A leading German telecommunications specialist for businesses, providing data, internet, and voice services with a strong focus on expanding their extensive fiber infrastructure | Telecommunications | 🇩🇪 Düsseldorf | 1,183 |  |
| 9 | [NetCologne](https://www.tamtam.ai/c/netcologne) (netcologne-unternehmen.de)<br>A regional telecommunications company in Cologne and Bonn, Germany, operating its own network and providing full communication services in the area | Telecommunications | 🇩🇪 Cologne | 958 | 1994 |
| 10 | [Vantage Towers](https://www.tamtam.ai/c/vantage-towers) (vantagetowers.com)<br>Leading tower company in Europe, connecting people, businesses, and devices through a vast network for faster, greener, and more efficient connectivity | Telecommunications | 🇩🇪 Düsseldorf | 769 |  |
| 11 | [RFS - Radio Frequency Systems](https://www.tamtam.ai/c/rfs-radio-frequency-systems) (rfsworld.com)<br>Design and manufacture of advanced RF cables, connectors, antennas, and conditioning products supporting 5G, small cells, and smart city networks. | Telecommunications | 🇩🇪 Hanover | 751 | 1900 |
| 12 | [Deutsche Funkturm](https://www.tamtam.ai/c/deutsche-funkturm) (dfmg.de)<br>A leading infrastructure provider in Germany, offering services to mobile network operators, broadcasters, and authorities with a focus on LTE and 5G technologies | Telecommunications | 🇩🇪 Leverkusen | 600 | 2002 |
| 13 | [PŸUR \| Tele Columbus](https://www.tamtam.ai/c/pyur-tele-columbus) (telecolumbus.com)<br>A leading German fiber network operator providing high-speed internet, phone, TV services, and custom fiber solutions to residential and business customers nationwide | Telecommunications | 🇩🇪 Berlin | 581 |  |
| 14 | [Avedo Gelsenkirchen GmbH](https://www.tamtam.ai/c/avedo-gmbh) (avedo.de)<br>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. | Telecommunications | 🇩🇪 Leipzig | 564 | 2004 |
| 15 | [LHS Telekommunikation](https://www.tamtam.ai/c/lhs-telekommunikation) (lhs-systems.com)<br>A global provider of telecom billing and customer care systems, offering innovative solutions for a wide range of services and business models | Telecommunications | 🇩🇪 Frankfurt | 552 | 1991 |
| 16 | [M-net Telekommunikations GmbH](https://www.tamtam.ai/c/m-net-telekommunikations-gmbh) (m-net.de)<br>Provides secure communication technology including voice, data, mobile, fixed-line, network solutions, and national/international radio and TV services. | Telecommunications | 🇩🇪 Munich | 538 | 1996 |
| 17 | [vitronet Gruppe](https://www.tamtam.ai/c/vitronet-gruppe) (vitronet.de)<br>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 | Telecommunications | 🇩🇪 Essen | 529 |  |
| 18 | [PROSE Technologies](https://www.tamtam.ai/c/prose-technologies) (prosetechnologies.com)<br>The company designs and builds technologies to connect people globally, ensuring communication without interruption, allowing connectivity to work, family, and beyond | Telecommunications | 🇩🇪 Donauwörth | 504 |  |
| 19 | [NFON AG](https://www.tamtam.ai/c/nfon-ag) (corporate.nfon.com)<br>A leading pan-European provider of cloud-based telephone systems, NFON AG offers modern communication solutions for businesses, focusing on simplicity and innovation | Telecommunications | 🇩🇪 Munich | 501 | 2007 |
| 20 | [Huawei Deutschland](https://www.tamtam.ai/c/huawei-deutschland) (huawei.com)<br>A global provider of information technology and telecommunications solutions with a focus on connectivity, computing, devices, automotive, digital power, and cloud services | Telecommunications | 🇩🇪 Düsseldorf | 490 | 2001 |
| 21 | [KiKxxl GmbH](https://www.tamtam.ai/c/kikxxl-gmbh) (kikxxl.de)<br>A leading contact center in Northern Germany offering various communication services with over 2,800 employees across multiple locations | Telecommunications | 🇩🇪 Osnabrück | 482 | 1999 |
| 22 | [KOMSA](https://www.tamtam.ai/c/komsa) (komsa.com)<br>Leading service provider in ICT sector in Europe, offering distribution, services, and repair to commercial and industrial partners with efficient support and quality at best costs Serving over 10,000 resellers | Telecommunications | 🇩🇪 Hartmannsdorf | 463 | 1992 |
| 23 | [Gigaset](https://www.tamtam.ai/c/gigaset) (gigaset.com)<br>An internationally active holding company specializing in communication technology, offering cordless phones, smartphones, smart home solutions, and business telephony products | Telecommunications | 🇩🇪 Bocholt | 450 | 1900 |
| 24 | [Deutsche GigaNetz GmbH](https://www.tamtam.ai/c/deutsche-giganetz-gmbh) (deutsche-giganetz.de)<br>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 | Telecommunications | 🇩🇪 Hamburg | 448 | 2020 |
| 25 | [freenet AG](https://www.tamtam.ai/c/freenet-ag) (freenet.ag)<br>Largest independent telecommunications provider in Germany offering mobile voice and data services with a focus on stakeholder responsibility. | Telecommunications | 🇩🇪 Büdelsdorf | 430 | 2007 |
| 26 | [Coriant, Inc.](https://www.tamtam.ai/c/coriant-inc) (nokia.com)<br>Innovative networking solutions for cloud-centric businesses, scaling capacity, reducing operational complexity, and enabling new generation mobile, video, and cloud services | Telecommunications | 🇩🇪 Munich | 418 | 2013 |
| 27 | [freenet DLS GmbH](https://www.tamtam.ai/c/freenet-dls-gmbh) (freenet.de)<br>The company offers a variety of telecommunications services including mobile phones, internet, TV entertainment, and accessories | Telecommunications | 🇩🇪 Büdelsdorf | 377 | 1992 |
| 28 | [AMEVIDA SE](https://www.tamtam.ai/c/amevida-se) (amevida.de)<br>A leading provider of customer care services in Germany, offering a wide range of future-oriented services in dialog marketing for various industries | Telecommunications | 🇩🇪 Gelsenkirchen | 367 |  |
| 29 | [congstar](https://www.tamtam.ai/c/congstar) (congstar.de)<br>An innovative and flexible ICT company in Germany, offering a vibrant work environment with a blend of startup culture and corporate security | Telecommunications | 🇩🇪 Cologne | 365 | 2007 |
| 30 | [CTDI Europe](https://www.tamtam.ai/c/ctdi-europe) (ctdi.eu)<br>A leader in communications, mobility, and consumer devices service industries, offering logistics, testing, repair, refurbishment services, and career opportunities | Telecommunications | 🇩🇪 Malsch | 339 | 2000 |
| 31 | [Mynaric](https://www.tamtam.ai/c/mynaric) (mynaric.com)<br>Leading the industrial revolution of laser communications, producing optical communication terminals for air, space, and mobile applications globally Headquarters in Munich | Telecommunications | 🇩🇪 Munich | 334 | 2009 |
| 32 | [Unsere Grüne Glasfaser](https://www.tamtam.ai/c/unsere-grune-glasfaser) (unseregrueneglasfaser.de)<br>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 | Telecommunications | 🇩🇪 Ismaning | 333 | 2020 |
| 33 | [MEDIA BROADCAST GmbH](https://www.tamtam.ai/c/media-broadcast-gmbh) (media-broadcast.com)<br>A leading service provider in Germany's broadcasting and media industry, specializing in digitalization, multimedia transmission platforms, broadcasting, connectivity, and telecommunication services | Telecommunications | 🇩🇪 Cologne | 326 | 1961 |
| 34 | [Deutsche Telekom Außendienst GmbH](https://www.tamtam.ai/c/deutsche-telekom-aussendienst-gmbh)<br>A subsidiary of Deutsche Telekom AG, specializing in telecommunications, IT, and IP products and services for private, business, and carrier customers nationwide | Telecommunications | 🇩🇪 Bonn | 322 |  |
| 35 | [freenet Shop GmbH](https://www.tamtam.ai/c/freenet-shop-gmbh) (freenet-digital.de)<br>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 | Telecommunications | 🇩🇪 Oberkrämer | 297 |  |
| 36 | [1NCE](https://www.tamtam.ai/c/1nce) (1nce.com)<br>Global provider of affordable, secure, and reliable cellular connectivity and software services for IoT devices in over 150 countries Headquarters in Cologne, Germany | Telecommunications | 🇩🇪 Cologne | 279 | 2017 |
| 37 | [STF Gruppe](https://www.tamtam.ai/c/stf-gruppe) (stf-gruppe.de)<br>An innovative engineering company providing tailored services in telecommunication, digitalization, IT, and technical building planning with 500+ employees across 18 locations nationwide | Telecommunications | 🇩🇪 Dülmen | 256 | 1997 |
| 38 | [brodos](https://www.tamtam.ai/c/brodos) (brodos.com)<br>Supplier and operator offering mobile devices, tariffs, and services, partnering with manufacturers and network providers for diverse customers. | Telecommunications | 🇩🇪 Baiersdorf | 236 | 1991 |
| 39 | [Triopt Group](https://www.tamtam.ai/c/triopt-group) (triopt-group.de)<br>TRIOPT GmbH provides technical services for planning, implementing, and optimizing wireless and fixed networks for mobile operators and system suppliers | Telecommunications | 🇩🇪 Moers | 217 | 2010 |
| 40 | [telent GmbH](https://www.tamtam.ai/c/telent-gmbh) (telent.de)<br>The company provides tailored technology solutions and services for Critical Infrastructures, Digitalization, and Industry 40, specializing in Cybersecurity, IP networks, IoT, and more | Telecommunications | 🇩🇪 Backnang | 217 | 2006 |
| 41 | [The Phone House Telecom GmbH](https://www.tamtam.ai/c/the-phone-house-telecom-gmbh) (phonehouse.de)<br>Phone House in Germany is a mobile communication retailer, managing franchise shops, stores for Deutsche Telekom and Samsung, and online sales | Telecommunications | 🇩🇪 Münster | 204 |  |
| 42 | [Insyte Deutschland GmbH](https://www.tamtam.ai/c/insyte-deutschland-gmbh) (insytedeutschland.de)<br>Providing high-quality installation, operation, and maintenance services for network infrastructures across various sectors with tailored end-to-end solutions. | Telecommunications | 🇩🇪 Ratingen | 183 | 2017 |
| 43 | [GlasfaserPlus GmbH](https://www.tamtam.ai/c/glasfaserplus-gmbh) (glasfaserplus.de)<br>Bringing fast and reliable internet to rural areas to ensure digital inclusion for all, striving to make it as essential as water and electricity | Telecommunications | 🇩🇪 Cologne | 179 | 2022 |
| 44 | [Circet Deutschland SE](https://www.tamtam.ai/c/circet-deutschland-se) (circet.de)<br>A leading telecommunications infrastructure provider with over 15,000 employees across multiple countries, specializing in turnkey projects, E-Mobility, and mobile network construction | Telecommunications | 🇩🇪 Bergisch Gladbach | 178 | 2018 |
| 45 | [WISI Group](https://www.tamtam.ai/c/wisi-group) (wisigroup.com)<br>A global pioneer in receiving and distributing technology, specializing in CATV, reception, mobile communication, and high-frequency assemblies to optimize network efficiency | Telecommunications | 🇩🇪 Niefern | 177 | 1926 |
| 46 | [GVG Glasfaser](https://www.tamtam.ai/c/gvg-glasfaser) (gvg-glasfaser.de)<br>The company plans, builds, and operates fiber optic networks to connect businesses and households, focusing on improving broadband access in rural areas | Telecommunications | 🇩🇪 Kiel | 172 | 2014 |
| 47 | [Ströer X GmbH](https://www.tamtam.ai/c/stroer-x-gmbh) (stroeer-x.de)<br>Ströer X GmbH provides outsourcing services for sales and customer services, enhancing customer satisfaction, saving time, and allowing clients to focus on core activities | Telecommunications | 🇩🇪 Leipzig | 167 | 2004 |
| 48 | [mobilezone Deutschland](https://www.tamtam.ai/c/mobilezone-deutschland) (mobilezone.org)<br>A leading e-commerce company in the telecommunications sector, specializing in mobile phone offers with pay monthly contracts and fast, secure dispatch of goods | Telecommunications | 🇩🇪 Cologne | 166 | 2000 |
| 49 | [SPIE comcross GmbH](https://www.tamtam.ai/c/spie-comcross-gmbh) (comcross.de)<br>Development and expansion of intelligent communication infrastructure supporting digital transformation and connecting people with the world through innovative technology. | Telecommunications | 🇩🇪 Leonberg | 165 | 2013 |
| 50 | [ecotel communication ag](https://www.tamtam.ai/c/ecotel-communication-ag) (ecotel.de)<br>A company specializing in business networking and innovation, preparing businesses for the digital workplace and helping them achieve their goals | Telecommunications | 🇩🇪 Düsseldorf | 161 | 1998 |

## 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](https://www.tamtam.ai/l/largest-companies-germany) (15,224)
- [Multinational companies in Germany](https://www.tamtam.ai/l/multinational-companies-germany) (4,800)
- [Companies with in-house R&D in Germany](https://www.tamtam.ai/l/r-and-d-companies-germany) (2,450)
- [Manufacturers in Germany](https://www.tamtam.ai/l/manufacturers-germany) (1,957)
- [Software Development companies in Germany](https://www.tamtam.ai/l/software-development-companies-germany) (1,401)
- [SaaS companies in Germany](https://www.tamtam.ai/l/saas-companies-germany) (1,389)
- [Retail chains in Germany](https://www.tamtam.ai/l/retail-chains-germany) (1,383)
- [Family-owned companies in Germany](https://www.tamtam.ai/l/family-owned-companies-germany) (1,330)
- [Hardware manufacturers in Germany](https://www.tamtam.ai/l/hardware-companies-germany) (1,316)
- [Critical infrastructure operators in Germany](https://www.tamtam.ai/l/critical-infrastructure-operators-germany) (1,305)
- [Financial services firms in Germany](https://www.tamtam.ai/l/financial-services-firms-germany) (1,265)
- [Transportation, Logistics, Supply Chain and Storage companies in Germany](https://www.tamtam.ai/l/transportation-logistics-supply-chain-and-storage-companies-germany) (1,145)
- [Companies with a mobile app in Germany](https://www.tamtam.ai/l/companies-with-mobile-app-germany) (928)
- [IT Services and IT Consulting companies in Germany](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-germany) (911)
- [Corporate groups and holding companies in Germany](https://www.tamtam.ai/l/holding-companies-germany) (832)
- [Public sector organisations in Germany](https://www.tamtam.ai/l/public-sector-organisations-germany) (812)
- [IT services companies in Germany](https://www.tamtam.ai/l/it-services-companies-germany) (776)
- [Financial Services companies in Germany](https://www.tamtam.ai/l/financial-services-companies-germany) (745)
- [Professional services firms in Germany](https://www.tamtam.ai/l/professional-services-firms-germany) (690)
- [Logistics companies in Germany](https://www.tamtam.ai/l/logistics-companies-germany) (597)
- [Consulting firms in Germany](https://www.tamtam.ai/l/consulting-firms-germany) (584)
- [Automotive manufacturers and suppliers in Germany](https://www.tamtam.ai/l/automotive-companies-germany) (504)
- [Banking companies in Germany](https://www.tamtam.ai/l/banking-companies-germany) (485)
- [Machinery Manufacturing companies in Germany](https://www.tamtam.ai/l/machinery-manufacturing-companies-germany) (476)

## The same list elsewhere in Germany

- [Telecommunications companies in North Rhine-Westphalia](https://www.tamtam.ai/l/telecommunications-companies-north-rhine-westphalia) (32)

## The same list elsewhere

- [Telecommunications companies in the world](https://www.tamtam.ai/l/telecommunications-companies-in-the-world) (3,307)
- [Telecommunications companies in Europe](https://www.tamtam.ai/l/telecommunications-companies-in-europe) (1,294)

---

Source: https://www.tamtam.ai/l/telecommunications-companies-germany