OTE
Greece's incumbent telecommunications and information-technology group, majority-owned by Deutsche Telekom.
Last updated August 31, 2026
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Overview
OTE, formally the Hellenic Telecommunications Organization S.A., is Greece's historic telecommunications operator and one of the country's largest listed companies. Established in 1949 as a successor to the Hellenic Telephone Company, OTE was created to coordinate Greece's previously fragmented telephone, telegraph, domestic-connection and international-communications infrastructure. For most of the post-war period it operated as a state-owned monopoly. The Greek telecommunications market began opening to competition in the 1990s, and OTE subsequently moved through a long privatization process while remaining a central provider of national communications infrastructure. The group has developed beyond traditional fixed-line telephony. Its activities have included fixed and mobile voice services, broadband access, fiber and other next-generation connectivity, pay television, satellite communications, retail distribution, contact-center services, information and communications technology, professional training, insurance agency services and management of telecommunications-related real estate. In Greece, the group has operated consumer-facing activities through brands and businesses including COSMOTE, Germanos and OTE TV, while the corporate group has also held or developed operations in several Balkan and southeastern European markets. OTE's strategic direction changed substantially during the 2000s. It expanded internationally, participated in mobile ventures and acquired or consolidated important Greek telecommunications assets. Deutsche Telekom entered the shareholding structure in 2008 through an agreement with the Greek state and became the company's largest shareholder in 2009. The German group later increased its holding, including a further acquisition in 2018, making OTE a subsidiary within the Deutsche Telekom group. OTE has remained listed on the Athens Exchange; it previously had a New York Stock Exchange listing but later delisted there. The company has repeatedly shifted its portfolio toward broadband, mobile data, television and higher-speed fixed networks. It introduced ADSL in Greece, later expanded VDSL availability and announced major investment in fiber infrastructure. Its consumer brands were consolidated under the COSMOTE name in 2015, reflecting an effort to present fixed, mobile, internet and television services as a unified offering. In 2024, the group announced the integration of the COSMOTE identity with Deutsche Telekom's brand architecture under the name Cosmote Telekom, with a subsequent announcement that the brand would transition to Telekom in autumn 2026. OTE also maintains activities outside direct connectivity. Its subsidiaries and affiliated businesses have included COSMOTE e-value for contact-center services, Germanos for technology and telecommunications retail, OTE Estate for property management and OTEAcademy for education and professional training. The OTE Telecommunications Museum in Athens, opened to the public in 1990, preserves material relating to the history and development of telecommunications. OTE is regulated in Greece by the National Telecommunications and Post Commission, alongside other telecommunications providers.
History
OTE was founded on 23 October 1949 under Greek legislation as the successor to the Hellenic Telephone Company, which had been established in 1926 to bring together Greece's fragmented public and private telecommunications activities. Its early role covered telephone and telegraph services as well as domestic and international connections. During the following decades OTE helped build a coordinated national network, including automated long-distance services, submarine connectivity with Italy, satellite-communications infrastructure and increasingly digitized switching centers. Until the late 1990s, OTE operated as a state-owned telecommunications monopoly. The Greek market began opening to competitors in 1998, and the company entered a gradual privatization process. OTE was listed on the Athens Exchange and later on the New York Stock Exchange. During the 1990s and early 2000s it expanded into the Balkans, southeastern Europe and the Middle East. International activity included an initial stake in Romania's RomTelecom, the creation of Globul in Bulgaria after obtaining a GSM license, and participation in other regional telecommunications businesses. The 2000s brought a major expansion of consumer services. OTE introduced ADSL broadband in Greece and increased available connection speeds. Together with COSMOTE, it served as a grand national sponsor of the 2004 Athens Olympic Games. The group also developed satellite and television activities, including the launch of Hellas Sat 2 and the introduction of CONN-X TV, which preceded later OTE TV services. OTE subsequently acquired full ownership of COSMOTE, while COSMOTE owned the Germanos telecommunications and technology retail chain. A decisive ownership change occurred in 2008, when an agreement between the Greek government and Deutsche Telekom gave each party 25 percent plus one share. Further transactions led Deutsche Telekom to become the largest shareholder in 2009. The Greek state continued reducing its holding, while Deutsche Telekom increased its position to 40 percent in 2011 and later acquired an additional 5 percent in 2018 through its right of first refusal. OTE thus became a Deutsche Telekom subsidiary while continuing to trade publicly in Athens. During the 2010s, OTE reshaped its portfolio around broadband, mobile services, pay television and network modernization. It sold or exited a number of regional holdings, including interests connected with Telekom Srbija, Hellas Sat and Bulgarian operations. It expanded VDSL availability, offered higher-speed broadband and carried out voluntary redundancy programs and employment agreements intended to reduce costs and adapt the business to a competitive market. In 2015, the COSMOTE name became the single consumer-facing brand for OTE's products and services. Network investment increasingly moved toward fiber and other next-generation infrastructure. OTE's management identified fiber deployment as a core strategic priority and announced a multiyear investment program. The group also retained a range of supporting businesses, including contact-center operations, retail, real-estate management and professional training. Its Telecommunications Museum in Athens, opened to the public in 1990, documents the history of communications technology and OTE's role in Greece. In the 2020s, the group continued aligning its Greek consumer identity with Deutsche Telekom's international brand architecture. In 2024 it announced the Cosmote Telekom identity, and it later announced a planned transition to the Telekom name in autumn 2026. OTE remains an active Greek telecommunications and ICT group, regulated by Greece's National Telecommunications and Post Commission and focused on fixed and mobile connectivity, broadband, television and business services.
- 2024
Cosmote Telekom branding announced
[1]The group announced the consolidation of the COSMOTE and Deutsche Telekom brand identities.
- 2018
Deutsche Telekom acquires an additional five percent
[1]Deutsche Telekom exercised its right of first refusal and completed the acquisition of an additional OTE stake.
- 2015
COSMOTE becomes the single consumer brand
[1]OTE unified its consumer products and services under the COSMOTE name.
- 2011
Deutsche Telekom raises its stake
[1]Deutsche Telekom acquired an additional 10 percent of OTE's share capital, reaching a 40 percent holding.
- 2009
COSMOTE becomes fully owned by OTE
[1]OTE acquired the remaining shares of COSMOTE and completed its ownership integration.
- 2008
Deutsche Telekom enters strategic ownership
[1]An agreement gave Deutsche Telekom and the Greek state equal holdings of 25 percent plus one share.
- 2004
Olympic Games sponsorship
[1]OTE and COSMOTE served as grand national sponsors of the Athens Olympic Games.
- 2000
OTE launches ADSL services
[1]The company introduced ADSL broadband access in Greece.
- 1998
Greek telecommunications market opens to competition
[1]OTE's former monopoly position ended as the market was opened to competing providers.
- 1996
Privatization begins
[1]The Greek state began reducing its ownership in OTE.
Products and positioning
National incumbent and integrated communications provider serving consumers, businesses and public-sector users in Greece, with a broad portfolio spanning fixed, mobile, broadband, television and ICT services.
Telecommunications · 1949
Fixed-line telephony
OTE's original and historic service area is fixed-line voice communication over Greece's national telecommunications network. The business has evolved from conventional telephone connections toward bundled voice, broadband and other household communications packages.
Mobile telecommunications
COSMOTE mobile communications
COSMOTE became OTE's principal consumer mobile identity after OTE acquired full ownership of COSMOTE. The portfolio includes mobile voice and data services and forms part of the group's integrated consumer communications offering in Greece.
Internet access · 2000
Broadband and fiber connectivity
OTE has provided fixed broadband through successive technology generations, beginning with ADSL and later expanding VDSL and fiber-oriented infrastructure. These services support household and business internet access, higher connection speeds and bundled voice offerings.
Pay television
OTE TV
OTE TV is the group's pay-television activity, developed through IPTV and satellite delivery. It followed the earlier CONN-X TV trial and incorporated television channels, high-definition content and related subscription services.
Information technology and communications
Business ICT services
OTE Group provides integrated information and communications technology services for business and institutional customers, using its fixed, mobile and broadband capabilities together with professional communications solutions.
Telecommunications retail
Germanos
Germanos is OTE's telecommunications and technology retail business. It distributes telecommunications services and technology products and has operated as a wholly owned group subsidiary.
Marketing campaigns
- 2015COSMOTE unified brand launch
Greece
OTE consolidated its consumer communications products and services under the COSMOTE brand to create a more unified market identity across fixed, mobile, broadband and television services.
Outcome. COSMOTE became the group's single consumer-facing brand.
- 2004Athens Olympic Games national sponsorship
Greece
OTE and COSMOTE participated as grand national sponsors of the Athens 2004 Olympic Games, linking the group with Greece's largest international sporting event.
Outcome. National sponsorship completed in connection with the 2004 Athens Olympic Games.
Brand decisions
2024
Brand integration with Deutsche TelekomStrategyBackground
OTE was aligning its Greek consumer identity with Deutsche Telekom's international brand architecture.
Action taken
The group announced the Cosmote Telekom brand identity and later communicated a planned transition to the Telekom name in autumn 2026.
Aftermath
The announced transition is intended to bring OTE's consumer branding closer to the wider Deutsche Telekom group.
2017
Fiber-network investment priorityStrategyBackground
Demand for faster fixed broadband and next-generation networks was increasing in Greece.
Action taken
Management prioritized fiber-optic network development and announced a multiyear investment program through 2020.
Aftermath
Network modernization became a central element of OTE's long-term competitive strategy.
2015
Consumer-brand consolidation under COSMOTEStrategyBackground
OTE sought to present its fixed, mobile, broadband and television products as one integrated consumer proposition.
Action taken
The company established COSMOTE as the single brand for its consumer products and services.
Aftermath
The COSMOTE identity became the main customer-facing brand across the Greek portfolio.
2013
Divestment of selected international assetsM&ABackground
OTE was concentrating its portfolio and managing capital across a difficult regional telecommunications environment.
Action taken
The group announced sales involving its Hellas Sat holding and its Bulgarian operations Globul and Germanos Telecom Bulgaria.
Aftermath
The transactions reduced OTE's exposure to selected international assets and supported a more focused group structure.
2009
Full acquisition of COSMOTEM&ABackground
Mobile communications had become a core growth area for the wider OTE group.
Action taken
OTE acquired the remaining shares of COSMOTE and made the mobile operator wholly owned.
Aftermath
OTE gained tighter control over its fixed-mobile portfolio and later used COSMOTE as its principal consumer brand.
2008
Strategic ownership agreement with Deutsche TelekomM&ABackground
The Greek state was progressively privatizing OTE while the company faced a more competitive telecommunications market.
Action taken
The Greek government and Deutsche Telekom agreed to hold 25 percent plus one share each.
Aftermath
Deutsche Telekom later became OTE's largest shareholder and the company became part of the Deutsche Telekom group.
2000
Launch of ADSL broadbandProduct launchBackground
The Greek market was moving from traditional voice networks toward internet access and data services.
Action taken
OTE introduced ADSL services and subsequently expanded available connection speeds.
Aftermath
Broadband became a central part of OTE's consumer and business portfolio.
Recent events
- 2026
OTE announces planned transition to the Telekom brand[1]
Campaign
OTE announced that the Cosmote Telekom name would change to Telekom in autumn 2026.
- 2025
OTE completes disposal of Telekom Romania Mobile[3]
M&A
OTE announced the completion of the sale of Telekom Romania Mobile Communications to Vodafone Romania, following the earlier disposal of its Romanian fixed-line business.
- 2024
COSMOTE identity is integrated with Deutsche Telekom branding[1]
Campaign
OTE Group announced the consolidation of the COSMOTE brand with Deutsche Telekom's identity under the Cosmote Telekom name.
- 2024
Kostas Nebis appointed chief executive of OTE[4]
Leadership change
Kostas Nebis succeeded Michael Tsamaz as OTE's chief executive, marking a change in the group's top management after Tsamaz's long tenure.
- 2024
Kostas Nebis appointed Chief Executive Officer of OTE[5]
Leadership change
OTE appointed Kostas Nebis as chief executive officer, succeeding Michael Tsamaz after his long tenure leading the group.
- 2024
OTE continues fiber and 5G network investment in Greece[6]
Other
The group continued expanding high-speed fiber access and upgrading its mobile network as part of its strategy to support converged digital services.
- 2024
Kostas Nebis appointed OTE Group chief executive[7]
Leadership change
Kostas Nebis took over as chief executive officer after Michael Tsamaz, who had led OTE since 2010.
- 2023
OTE and Deutsche Telekom advanced fiber and 5G investment in Greece[4]
Product generation · Other
The group continued deploying next-generation fixed and mobile networks, including fiber access and 5G, as part of the modernization of Greece's communications infrastructure.
- 2023
OTE and Deutsche Telekom remain focused on Greek telecommunications growth[6]
Other
The controlling shareholder and OTE management emphasized network investment, digital transformation and operating performance in the Greek market.
- 2022
OTE completed the divestment of Telekom Romania Mobile[4]
M&A
OTE sold Telekom Romania Mobile to Vodafone Romania, continuing its withdrawal from the Romanian telecommunications market and concentrating the group on Greece.
Showing the 10 most recent.
Sources9 sources
- 1OTEen.wikipedia.org
- 2OTE official websiteote.gr
- 3OTE completes disposal of Telekom Romania Mobileote.gr
- 4Kostas Nebis appointed chief executive of OTEcosmote.gr
- 5Kostas Nebis appointed Chief Executive Officer of OTEcosmote.gr
- 6OTE continues fiber and 5G network investment in Greececosmote.gr
- 7Kostas Nebis appointed OTE Group chief executiveote.gr
- 8Orange Romania completes acquisition of 54 pct of Telekom Romania Communications stakestiripesurse.ro
- 9OTE announces sale of 54% stake in Telekom Romania - Οικονομικός Ταχυδρόμος - ot.grot.gr
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