# 38 leading IT services companies in Greece
Tamtam tracks 38 IT services companies headquartered in Greece. This list ranks all of them by number of employees on LinkedIn, led by OTE Group of Companies (HTO), Accenture Greece and Uni Systems. Their median headcount is 244. Half of them were founded in 1999 or later. The most common headquarters are Athens (14), Thessaloniki (4) and Marousi (3).
This selection of large IT services companies in Greece provides a view of the country's technology sector. These firms primarily focus on IT consulting, software development, and telecommunications. Notable companies include OTE Group of Companies, which is part of Deutsche Telekom Group and offers a range of telecom services, and Accenture Greece, providing global consulting services and technology solutions. Uni Systems, an established ICT partner, has over 60 years of experience in innovative solutions.
Other significant players are Intracom Telecom, a global provider of technology systems specializing in fixed wireless access and 5G/4G innovation, and Mellon Group, offering technology solutions and outsourced services across various sectors. EUROPEAN DYNAMICS focuses on designing and operating complex IT systems for eGovernment activities. The headquarters are predominantly located in Athens and its surrounding areas, indicating a geographical concentration of the IT services industry.
๐ฌ๐ท Greece ยท 38 companies ยท Updated Nov 11, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [OTE Group of Companies (HTO)](https://www.tamtam.ai/c/ote-group-of-companies-hto) (cosmote.gr)
A leading technology company in Greece, part of Deutsche Telekom Group, providing a wide range of telecom services and ICT solutions for digital transformation and growth | Telecommunications | ๐ฌ๐ท Athens | 7,648 | |
| 2 | [Accenture Greece](https://www.tamtam.ai/c/accenture-greece) (accenture.com)
Provides global consulting services, leveraging technology to drive innovation, create digital ecosystems, and transform organizations across private and public sectors, enhancing competitiveness. | IT Services and IT Consulting | ๐ฌ๐ท Kifisia | 1,209 | 1992 |
| 3 | [Uni Systems](https://www.tamtam.ai/c/uni-systems) (unisystems.com)
An established ICT partner with over 60 years of experience, providing innovative solutions to European and international organizations in various sectors | IT Services and IT Consulting | ๐ฌ๐ท Athens | 1,100 | 1964 |
| 4 | [Intracom Telecom](https://www.tamtam.ai/c/intracom-telecom) (intracom-telecom.com)
Global provider of technology systems and solutions specializing in fixed wireless access, 5G/4G innovation, IoT, SDN/NFV, Big Data analytics, Smart City solutions, and defense systems | Telecommunications | ๐ฌ๐ท Peania | 1,065 | 1977 |
| 5 | [Mellon Group](https://www.tamtam.ai/c/mellon-group) (mellongroup.com)
Multinational group providing technology solutions and outsourced services to organizations in consumer business, financial, utilities, telecom, and retail sectors | IT Services and IT Consulting | ๐ฌ๐ท Piraeus | 1,040 | 1994 |
| 6 | [EUROPEAN DYNAMICS](https://www.tamtam.ai/c/european-dynamics) (eurodyn.com)
Design, develop, support, and operate complex IT systems and software products tailored for eGovernment activities across multiple countries. | IT Services and IT Consulting | ๐ฌ๐ท Marousi | 843 | 1993 |
| 7 | [EPSILONNET](https://www.tamtam.ai/c/epsilonnet) (epsilonnet.gr)
A group of companies dedicated to IT, digital content development, and vocational training, leading the digital transformation of Greek enterprises | Software Development | ๐ฌ๐ท Thessaloniki | 777 | 1999 |
| 8 | [SPACE HELLAS S.A.](https://www.tamtam.ai/c/space-hellas-s-a) (space.gr)
Comprehensive ICT and security solutions provider offering infrastructure, telecom, cloud, unified communications, and physical security services with global partnerships. | IT Services and IT Consulting | ๐ฌ๐ท Agia Paraskevi | 520 | 1985 |
| 9 | [Qualco Group](https://www.tamtam.ai/c/qualco-group) (qualco.group)
Innovative technology solutions empower individuals in finance, property, and digital fields, creating better financial well-being and transforming businesses | Software Development | ๐ฌ๐ท Athens | 469 | 1998 |
| 10 | [Mellon Technologies](https://www.tamtam.ai/c/mellon-technologies) (mellongroup.com)
Provider of hardware and software solutions, telemarketing/helpdesk services, and business process management for organizations in consumer-focused industries Founded in 1994 | IT Services and IT Consulting | ๐ฌ๐ท Piraeus | 448 | |
| 11 | [T-Digital by Deutsche Telekom](https://www.tamtam.ai/c/t-digital-by-deutsche-telekom) (t-digital-greece.com)
T-Digital is a cutting-edge IT hub in Greece, fostering creativity and innovation to develop high-quality products and services in integrated teams | IT System Custom Software Development | ๐ฌ๐ท Thessaloniki | 443 | |
| 12 | [Cognity](https://www.tamtam.ai/c/cognity) (cognity.gr)
Cognity is a digital enabler for telecommunications, financial services, and retail industries in Europe, Middle East, and South Africa, specializing in digital transformation services | IT Services and IT Consulting | ๐ฌ๐ท Athens | 428 | 2005 |
| 13 | [Info Quest Technologies](https://www.tamtam.ai/c/info-quest-technologies) (infoquest.gr)
Incorporating new technologies to provide advanced products, integrated solutions, and services that satisfy emerging needs in IT and Telecommunications convergence | IT Services and IT Consulting | ๐ฌ๐ท Kallithea | 387 | 1981 |
| 14 | [SingularLogic](https://www.tamtam.ai/c/singularlogic) (singularlogic.eu)
Leading software integrator providing enterprise solutions and services for large organizations in public and private sectors, with expertise in digital challenges and IT solutions | IT Services and IT Consulting | ๐ฌ๐ท Cholargos | 369 | |
| 15 | [Agile Actors](https://www.tamtam.ai/c/agile-actors) (agileactors.com)
We provide software development and data engineering services by cultivating skilled tech teams, focusing on continuous improvement and career advancement for tech professionals | IT Services and IT Consulting | ๐ฌ๐ท Chalandri | 336 | 2012 |
| 16 | [Neurosoft](https://www.tamtam.ai/c/neurosoft) (neurosoft.gr)
A leading provider offering integrated services in Cyber Security, Technology Solutions, and Field Services for business resilience and continuity | IT Services and IT Consulting | ๐ฌ๐ท Irakleio | 330 | 1994 |
| 17 | [ARHS Developments Hellas](https://www.tamtam.ai/c/arhs-developments-hellas) (arhs-dev-hellas.com)
Specializing in advanced IT project and system management, software development, business intelligence, digital trust, and enterprise architecture services for European markets | IT Services and IT Consulting | ๐ฌ๐ท Athens | 289 | 2016 |
| 18 | [SUPERVISOR SA](https://www.tamtam.ai/c/supervisor-sa) (supervisor.gr)
Established in 1988, the company focuses on providing high-quality and modern information systems, including installation, training, customization, and maintenance of software programs | Software Development | ๐ฌ๐ท Galatsi | 257 | 1988 |
| 19 | [TEKA Systems](https://www.tamtam.ai/c/teka-systems) (tekasystems.com)
Leading business technology provider in Greece and Southeastern Europe, specializing in SAP ERP, ServiceNow, Salesforce, and OpenText projects for various industries worldwide | IT Services and IT Consulting | ๐ฌ๐ท Chalandri | 244 | 1975 |
| 20 | [EPSILON SINGULARLOGIC](https://www.tamtam.ai/c/epsilon-singularlogic) (epsilon-singularlogic.eu)
Provider of innovative IT Systems solutions with specialized expertise in ERP, CRM, RETAIL WMS, MOBILE, MIS systems for enterprises and organizations | IT Services and IT Consulting | ๐ฌ๐ท | 236 | |
| 21 | [Infocell](https://www.tamtam.ai/c/infocell) (infocell.gr)
A provider of telecommunications, software development, virtual services, broadband, web hosting, R&D, mobile and premium services, internet advertising, and phone services | Telecommunications | ๐ฌ๐ท Athens | 233 | 2008 |
| 22 | [MKI](https://www.tamtam.ai/c/mki) (mki.gr)
Specializing in web and mobile app development, we serve high-profile clients and internal projects with a focus on quality and detail | IT Services and IT Consulting | ๐ฌ๐ท Thessaloniki | 222 | 2014 |
| 23 | [TRASYS GREECE](https://www.tamtam.ai/c/trasys-greece) (trasysinternational.com)
Specialized IT consultancy providing solutions for public organizations and businesses to comply with regulations, improve digital workspace, and enhance IT security | Software Development | ๐ฌ๐ท Chalandri | 208 | 2004 |
| 24 | [UBITECH](https://www.tamtam.ai/c/ubitech) (ubitech.eu)
A leading provider of innovative technical solutions, consulting services, and IT integration for businesses, organizations, and governments worldwide | IT Services and IT Consulting | ๐ฌ๐ท Athens | 186 | 2005 |
| 25 | [IKNOWHOW SA](https://www.tamtam.ai/c/iknowhow-sa) (iknowhow.com)
Greek technology firm providing tailor-made software solutions, ICT strategy consulting, digital government, e-Health, and robotics services, with a strong focus on digital transformation and information security | Software Development | ๐ฌ๐ท Athens | 147 | 2002 |
| 26 | [Kenotom - Embedded Engineering Excellence](https://www.tamtam.ai/c/kenotom-embedded-engineering-excellence) (kenotom.com)
Engineering services provider specializing in firmware development, test automation, control solutions, electronics design, and project management for automotive, industrial automation, aviation, and medical sectors | Embedded Software Products | ๐ฌ๐ท Kalamaria | 145 | 2014 |
| 27 | [Radial](https://www.tamtam.ai/c/radial) (radial.gr)
A dedicated web design and development agency creating exceptional websites and digital marketing campaigns with passion | Technology, Information and Internet | ๐ฌ๐ท Athens | 143 | 2003 |
| 28 | [INFORM, member of AUSTRIACARD HOLDINGS](https://www.tamtam.ai/c/inform-member-of-austriacard-holdings) (austriacard.com)
A digital data solutions provider offering printing services, data management, business process outsourcing, and digital security solutions to various industries | IT Services and IT Consulting | ๐ฌ๐ท Koropi | 129 | 1897 |
| 29 | [Quality & Reliability S.A. (QnR)](https://www.tamtam.ai/c/quality-and-reliability-s-a-qnr) (qnr.com.gr)
A leading System Integrator in Greece that develops and implements complex IT systems for governmental organizations and enterprises, focusing on emerging technologies and strategic partnerships | Software Development | ๐ฌ๐ท Metamorfosi | 96 | 1992 |
| 30 | [iteam Technology Solutions S.A.](https://www.tamtam.ai/c/iteam-technology-solutions-s-a) (iteam.gr)
Technology solutions provider specializing in custom software development, business intelligence, machine learning, and infrastructure management, with expertise in aviation industry solutions | IT Services and IT Consulting | ๐ฌ๐ท Athens | 83 | 1999 |
| 31 | [Appnox Technologies](https://www.tamtam.ai/c/appnox-technologies) (appnox.ai)
The company specializes in leveraging AI, Machine Learning, and Data Science to provide organizations with faster, smarter, and actionable insights | Software Development | ๐ฌ๐ท Thessaloniki | 42 | 2018 |
| 32 | [nvisionist](https://www.tamtam.ai/c/nvisionist) (nvisionist.com)
Development of AI-powered digital technology solutions for renewable energy, safety systems, computer vision, and large-scale project management. | IT Services and IT Consulting | ๐ฌ๐ท Marousi | 37 | 2021 |
| 33 | [ILYDA SA](https://www.tamtam.ai/c/ilyda-sa) (ilyda.com)
ILYDA specializes in developing software, providing advanced IT services, and organizing divisions for effective information technology and telecommunications utilization since 1992 | Software Development | ๐ฌ๐ท Athens | 36 | 1992 |
| 34 | [Synthetica](https://www.tamtam.ai/c/synthetica) (synthetica.ai)
A data science company creating customized software solutions to enhance workflow efficiency and productivity for businesses | Software Development | ๐ฌ๐ท Marousi | 23 | 2019 |
| 35 | [InVision Consulting](https://www.tamtam.ai/c/invision-consulting) (invision.gr)
An independent consulting and systems firm based in Athens, specializing in transportation data systems/software development and ICT, with a client-based approach | IT Services and IT Consulting | ๐ฌ๐ท Athens | 12 | 1997 |
| 36 | [CubeIQ](https://www.tamtam.ai/c/cubeiq) (cubeiq.gr)
Specialized in electronic transaction processing, retail, and FI markets, CubeIQ offers integrated services and solutions with leading-edge software and hardware products to financial industries | IT Services and IT Consulting | ๐ฌ๐ท Nea Ionia | 11 | 2003 |
| 37 | [Dot by Dot](https://www.tamtam.ai/c/dot-by-dot) (dotbydot.gr)
A tech solutions provider in Athens, Greece, specializing in innovative software products for hospitals and enterprises, driven by quality, innovation, and dedicated professionals | Software Development | ๐ฌ๐ท Athens | 10 | 2012 |
| 38 | [COntent Management In Culture COMIC](https://www.tamtam.ai/c/content-management-in-culture-comic) (comic.com.gr)
Specializing in IT and telecommunications services for the cultural sector, the company offers innovative solutions for digital projects and applications | IT Services and IT Consulting | ๐ฌ๐ท Athens | 5 | 2013 |
## 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 11, 2026.
## More company lists in Greece
- [The largest companies in Greece](https://www.tamtam.ai/l/largest-companies-greece) (778)
- [Multinational companies in Greece](https://www.tamtam.ai/l/multinational-companies-greece) (217)
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- [Corporate groups and holding companies in Greece](https://www.tamtam.ai/l/holding-companies-greece) (49)
- [Public sector organisations in Greece](https://www.tamtam.ai/l/public-sector-organisations-greece) (49)
- [Financial services firms in Greece](https://www.tamtam.ai/l/financial-services-firms-greece) (48)
- [Pharmaceutical companies in Greece](https://www.tamtam.ai/l/pharmaceutical-companies-greece) (48)
- [Food and beverage companies in Greece](https://www.tamtam.ai/l/food-and-beverage-companies-greece) (47)
- [Food and Beverage Manufacturing companies in Greece](https://www.tamtam.ai/l/food-and-beverage-manufacturing-companies-greece) (44)
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- [Family-owned companies in Greece](https://www.tamtam.ai/l/family-owned-companies-greece) (41)
- [IT Services and IT Consulting companies in Greece](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-greece) (38)
- [Software Development companies in Greece](https://www.tamtam.ai/l/software-development-companies-greece) (38)
- [Publicly traded companies in Greece](https://www.tamtam.ai/l/publicly-traded-companies-greece) (37)
- [Logistics companies in Greece](https://www.tamtam.ai/l/logistics-companies-greece) (36)
- [E-commerce companies in Greece](https://www.tamtam.ai/l/ecommerce-companies-greece) (34)
- [Food and Beverage Services companies in Greece](https://www.tamtam.ai/l/food-and-beverage-services-companies-greece) (34)
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Source: https://www.tamtam.ai/l/it-services-companies-greece