These Ankara-based companies operate in critical infrastructure sectors, including telecommunications, energy, and transportation. They are predominantly large, well-established organizations. For example, Turk Telekom is a major telecommunications operator, TEIAS manages electricity transmission, and dhmi is responsible for Turkish airports and air traffic. Ptt AŞ provides postal, banking, and logistics services, while Ankara City Hospital offers extensive healthcare.
A significant pattern among these entities is their long operational history; many were founded in the early to mid-20th century. Notably, institutions like Turk Telekom and Ptt AŞ date back to 1840, and Türkiye Cumhuriyeti Devlet Demiryolları (TCDD) to 1859, indicating a strong foundation in public and essential services.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Turk Telekomturktelekom.com.tr
Leading integrated telecommunications operator in Turkey offering mobile, internet, phone, and TV services with a wide range of products and services |
21,095 | |||
| 2 |
TEIASteias.gov.tr
Leading electricity transmission operator in Turkey, integrating into international energy markets, expanding infrastructure, and operating in quality, economically, and reliably |
3,816 | |||
| 3 |
dhmidhmi.gov.tr
The organization is responsible for managing Turkish airports, regulating air traffic in Turkish airspace, and providing various aviation services in compliance with international standards |
3,473 | |||
| 4 |
Ptt AŞptt.gov.tr
A leading institution in Turkey offering efficient postal, banking, and logistics services with a focus on quality, reliability, and customer satisfaction |
3,191 | |||
| 5 |
Ankara City Hospitalankarasehir.saglik.gov.tr
A leading healthcare provider with a state-of-the-art 4190 bed capacity hospital offering specialized medical services in various fields |
3,078 | |||
| 6 |
Limak Group of Companieslimak.com.tr
Operating across diverse sectors including construction, energy, tourism, cement, infrastructure, technology, and food and beverage, with global and international operations. |
2,921 | |||
| 7 |
Ankara Büyükşehir Belediyesiankara.bel.tr
The organization is responsible for strategic planning, budgeting, urban development, transportation planning, and issuing permits within Ankara city limits as mandated by legislation |
2,750 | |||
| 8 |
Koloğlu Holdingkolin.com.tr
A diversified conglomerate investing in various sectors including construction, energy, mining, tourism, port operations, shipyard management, and industrial production, emphasizing sustainable development and social responsibility |
2,697 | |||
| 9 |
BOTAŞbotas.gov.tr
A leading energy organization in Turkey focusing on oil and natural gas operations, LNG terminals, international transportation projects, and environmental sustainability |
2,180 | |||
| 10 |
Central Bank of the Republic of Türkiyetcmb.gov.tr
Responsible for regulating monetary and exchange rate policies, ensuring banknote circulation, and maintaining price stability in Turkey. |
2,060 | |||
| 11 |
EÜAŞ, (Elektrik Üretim Anonim Şirketi)euas.gov.tr
A state-owned entity responsible for operating thermal and hydraulic power plants, ensuring power supply security and building new plants when approved |
1,862 | |||
| 12 |
Türksat Uydu Haberleşme Kablo TV ve İşletme A.Ş.turksat.com.tr
A leading satellite operator offering services in satellite communications, cable broadcasting, and IT fields in Turkey and worldwide |
1,706 | |||
| 13 |
GÜRİŞ HOLDİNGguris.com.tr
Leading construction group specializing in engineering and construction of various infrastructure projects such as metro systems, bridges, dams, and sustainable energy plants |
1,654 | |||
| 14 |
Türkiye Cumhuriyeti Devlet Demiryolları (TCDD)tcdd.gov.tr
Turkish state-owned railway entity under the Ministry of Transport and Communications, overseeing operations and infrastructure within the country |
1,534 | |||
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. | |||||
| 15 |
Akkuyu Nükleerakkuyu.com
Specializes in the construction and operation of Turkey's first nuclear power plant with advanced safety systems, providing a significant portion of the country's electricity needs |
1,488 | |||
| 16 |
TCDD Taşımacılık A.Ş.gov.tr
Established in 2016 under Turkish Railway Liberalization Law, the company provides freight and passenger transportation services on national railway infrastructure |
1,447 | |||
| 17 |
Fernasfernas.com.tr
Founded in 1982, this construction firm has completed various projects internationally, including industrial plants, pipelines, dams, and infrastructure construction |
1,255 | |||
| 18 |
Enerjisa Başkent Elektrik Dağıtım A.Ş.enerjisa.com.tr
Page under construction with a focus on providing innovative solutions in a wide range of industries |
1,095 | |||
| 19 |
Lokman Hekim Sağlık Grubulokmanhekim.com.tr
A healthcare group with multiple hospitals and medical facilities focused on providing quality healthcare services with expert medical staff and modern technology |
933 | |||
| 20 |
Turkish Electricity Distribution Corporation (TEDAŞ)tedas.gov.tr
Official page of a Turkish electricity distribution corporation providing essential services in the energy sector to customers and communities |
924 | |||
| 21 |
Ankara Guven Hospitalguven.com.tr
We are a global healthcare organization known for our exemplary services, creating opportunities, exceeding patient satisfaction, and prioritizing communication and safety |
752 | |||
| 22 |
Bayındır Sağlık Grubuacibadembayindir.com
A leading healthcare group in Turkey, dedicated to raising health standards with a patient-focused, evidence-based approach and a culture of quality and ethics |
608 | |||
| 23 |
Fernas Construction Company Inc.fernas.com.tr
A Turkey-based construction company, established in 1982, with projects in Qatar, India, Kazakhstan, Iraq, Bangladesh, and Oman, specializing in various infrastructure construction projects worldwide |
579 | |||
| 24 |
Türkerler Holdingturkerler.com
Global construction and energy sector leader in quality, innovation, and technology, operating in domestic and international markets with a commitment to constant renewal |
568 | |||
| 25 | 541 | ||||
| 26 |
Elektrik Üretim A.Ş.euas.gov.tr
TEAŞ is a conglomerate of three separate organizations in the energy sector: EÜAŞ, TEİAŞ, and TETAŞ, focusing on electricity generation, transmission, and trading |
511 | |||
| 27 | 383 | ||||
| 28 |
Başkent Doğalgaz Dağıtım GYO A.Ş.baskentdogalgaz.com.tr
A leading natural gas distribution company in Ankara, serving over 2 million customers with a focus on quality, safety, and customer satisfaction |
365 | |||
| 29 |
Akfen Holdingakfen.com.tr
A leading infrastructure investment holding with diverse subsidiaries in airport management, construction, port operations, energy, real estate, water services, and more |
273 | |||
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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 11, 2026.
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- Corporate groups and holding companies in Ankara 40
- Energy companies in Ankara 37
- Education providers in Ankara 32
- Construction companies in Ankara 29
- Hardware manufacturers in Ankara 28
- Aerospace and defence companies in Ankara 26