# 29 leading critical infrastructure operators in Ankara

Tamtam tracks 29 critical infrastructure operators headquartered in Ankara. This list ranks all of them by number of employees on LinkedIn, led by Turk Telekom, TEIAS and dhmi. Their median headcount is 1,488. Half of them were founded in 1992 or later.

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.

🇹🇷 Ankara · 29 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Turk Telekom](https://www.tamtam.ai/c/turk-telekom) (turktelekom.com.tr)<br>Leading integrated telecommunications operator in Turkey offering mobile, internet, phone, and TV services with a wide range of products and services | Telecommunications | 🇹🇷 Ankara | 21,095 | 1840 |
| 2 | [TEIAS](https://www.tamtam.ai/c/teias-ankara) (teias.gov.tr)<br>Leading electricity transmission operator in Turkey, integrating into international energy markets, expanding infrastructure, and operating in quality, economically, and reliably | Electric Power Transmission, Control, and Distribution | 🇹🇷 Ankara | 3,816 | 2001 |
| 3 | [dhmi](https://www.tamtam.ai/c/dhmi) (dhmi.gov.tr)<br>The organization is responsible for managing Turkish airports, regulating air traffic in Turkish airspace, and providing various aviation services in compliance with international standards | Airlines and Aviation | 🇹🇷 Ankara | 3,473 | 1933 |
| 4 | [Ptt AŞ](https://www.tamtam.ai/c/ptt-as) (ptt.gov.tr)<br>A leading institution in Turkey offering efficient postal, banking, and logistics services with a focus on quality, reliability, and customer satisfaction | Postal Services | 🇹🇷 Ankara | 3,191 | 1840 |
| 5 | [Ankara City Hospital](https://www.tamtam.ai/c/ankara-city-hospital) (ankarasehir.saglik.gov.tr)<br>A leading healthcare provider with a state-of-the-art 4190 bed capacity hospital offering specialized medical services in various fields | Hospitals and Health Care | 🇹🇷 Ankara | 3,078 | 2019 |
| 6 | [Limak Group of Companies](https://www.tamtam.ai/c/limak-group-of-companies) (limak.com.tr)<br>Operating across diverse sectors including construction, energy, tourism, cement, infrastructure, technology, and food and beverage, with global and international operations. | Holding Companies | 🇹🇷 Ankara | 2,921 | 1976 |
| 7 | [Ankara Büyükşehir Belediyesi](https://www.tamtam.ai/c/ankara-buyuksehir-belediyesi) (ankara.bel.tr)<br>The organization is responsible for strategic planning, budgeting, urban development, transportation planning, and issuing permits within Ankara city limits as mandated by legislation | Utilities | 🇹🇷 Ankara | 2,750 | 1924 |
| 8 | [Koloğlu Holding](https://www.tamtam.ai/c/kologlu-holding) (kolin.com.tr)<br>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 | Construction | 🇹🇷 Ankara | 2,697 |  |
| 9 | [BOTAŞ](https://www.tamtam.ai/c/botas) (botas.gov.tr)<br>A leading energy organization in Turkey focusing on oil and natural gas operations, LNG terminals, international transportation projects, and environmental sustainability | Oil and Gas | 🇹🇷 Ankara | 2,180 | 1974 |
| 10 | [Central Bank of the Republic of Türkiye](https://www.tamtam.ai/c/central-bank-of-the-republic-of-turkiye) (tcmb.gov.tr)<br>Responsible for regulating monetary and exchange rate policies, ensuring banknote circulation, and maintaining price stability in Turkey. | Banking | 🇹🇷 Ankara | 2,060 | 1930 |
| 11 | [EÜAŞ, (Elektrik Üretim Anonim Şirketi)](https://www.tamtam.ai/c/euas-elektrik-uretim-anonim-sirketi) (euas.gov.tr)<br>A state-owned entity responsible for operating thermal and hydraulic power plants, ensuring power supply security and building new plants when approved | Oil and Gas | 🇹🇷 Ankara | 1,862 | 2001 |
| 12 | [Türksat Uydu Haberleşme Kablo TV ve İşletme A.Ş.](https://www.tamtam.ai/c/turksat-uydu-haberlesme-kablo-tv-ve-isletme-a-s) (turksat.com.tr)<br>A leading satellite operator offering services in satellite communications, cable broadcasting, and IT fields in Turkey and worldwide | Telecommunications | 🇹🇷 Ankara | 1,706 | 2004 |
| 13 | [GÜRİŞ HOLDİNG](https://www.tamtam.ai/c/guris-holding) (guris.com.tr)<br>Leading construction group specializing in engineering and construction of various infrastructure projects such as metro systems, bridges, dams, and sustainable energy plants | Civil Engineering | 🇹🇷 Ankara | 1,654 | 1958 |
| 14 | [Türkiye Cumhuriyeti Devlet Demiryolları (TCDD)](https://www.tamtam.ai/c/turkiye-cumhuriyeti-devlet-demiryollar-tcdd) (tcdd.gov.tr)<br>Turkish state-owned railway entity under the Ministry of Transport and Communications, overseeing operations and infrastructure within the country | Truck Transportation | 🇹🇷 Ankara | 1,534 | 1859 |
| 15 | [Akkuyu Nükleer](https://www.tamtam.ai/c/akkuyu-nukleer) (akkuyu.com)<br>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 | Nuclear Electric Power Generation | 🇹🇷 Ankara | 1,488 | 2011 |
| 16 | [TCDD Taşımacılık A.Ş.](https://www.tamtam.ai/c/tcdd-tas-mac-l-k-a-s) (gov.tr)<br>Established in 2016 under Turkish Railway Liberalization Law, the company provides freight and passenger transportation services on national railway infrastructure | Truck Transportation | 🇹🇷 Ankara | 1,447 |  |
| 17 | [Fernas](https://www.tamtam.ai/c/fernas) (fernas.com.tr)<br>Founded in 1982, this construction firm has completed various projects internationally, including industrial plants, pipelines, dams, and infrastructure construction | Holding Companies | 🇹🇷 Ankara | 1,255 | 1982 |
| 18 | [Enerjisa Başkent Elektrik Dağıtım A.Ş.](https://www.tamtam.ai/c/enerjisa-baskent-elektrik-dag-t-m-a-s) (enerjisa.com.tr)<br>Page under construction with a focus on providing innovative solutions in a wide range of industries | Utilities | 🇹🇷 Ankara | 1,095 | 1993 |
| 19 | [Lokman Hekim Sağlık Grubu](https://www.tamtam.ai/c/lokman-hekim-sagl-k-grubu) (lokmanhekim.com.tr)<br>A healthcare group with multiple hospitals and medical facilities focused on providing quality healthcare services with expert medical staff and modern technology | Hospitals and Health Care | 🇹🇷 Ankara | 933 | 1996 |
| 20 | [Turkish Electricity Distribution Corporation (TEDAŞ)](https://www.tamtam.ai/c/turkish-electricity-distribution-corporation-tedas) (tedas.gov.tr)<br>Official page of a Turkish electricity distribution corporation providing essential services in the energy sector to customers and communities | Electric Power Transmission, Control, and Distribution | 🇹🇷 Ankara | 924 | 1994 |
| 21 | [Ankara Guven Hospital](https://www.tamtam.ai/c/ankara-guven-hospital) (guven.com.tr)<br>We are a global healthcare organization known for our exemplary services, creating opportunities, exceeding patient satisfaction, and prioritizing communication and safety | Hospitals and Health Care | 🇹🇷 Ankara | 752 | 1975 |
| 22 | [Bayındır Sağlık Grubu](https://www.tamtam.ai/c/bay-nd-r-sagl-k-grubu) (acibadembayindir.com)<br>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 | Hospitals and Health Care | 🇹🇷 Ankara | 608 | 1992 |
| 23 | [Fernas Construction Company Inc.](https://www.tamtam.ai/c/fernas-construction-company-inc) (fernas.com.tr)<br>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 | Oil and Gas | 🇹🇷 Ankara | 579 |  |
| 24 | [Türkerler Holding](https://www.tamtam.ai/c/turkerler-holding) (turkerler.com)<br>Global construction and energy sector leader in quality, innovation, and technology, operating in domestic and international markets with a commitment to constant renewal | Construction | 🇹🇷 Ankara | 568 | 1993 |
| 25 | [TEİAŞ](https://www.tamtam.ai/c/teias) (gov.tr)<br>It is a state economic enterprise focused on expanding and improving Turkey's electricity transmission infrastructure to operate it efficiently, economically, and reliably | Utilities | 🇹🇷 Ankara | 541 |  |
| 26 | [Elektrik Üretim A.Ş.](https://www.tamtam.ai/c/elektrik-uretim-a-s) (euas.gov.tr)<br>TEAŞ is a conglomerate of three separate organizations in the energy sector: EÜAŞ, TEİAŞ, and TETAŞ, focusing on electricity generation, transmission, and trading | Electric Power Generation | 🇹🇷 Ankara | 511 | 2001 |
| 27 | [GİB Teknoloji](https://www.tamtam.ai/c/gib-teknoloji) (teknoloji.gib.gov.tr)<br>Leading the way in digital transformation | Utilities | 🇹🇷 Ankara | 383 |  |
| 28 | [Başkent Doğalgaz Dağıtım GYO A.Ş.](https://www.tamtam.ai/c/baskent-dogalgaz-dag-t-m-gyo-a-s) (baskentdogalgaz.com.tr)<br>A leading natural gas distribution company in Ankara, serving over 2 million customers with a focus on quality, safety, and customer satisfaction | Oil and Gas | 🇹🇷 Ankara | 365 | 2007 |
| 29 | [Akfen Holding](https://www.tamtam.ai/c/akfen-holding) (akfen.com.tr)<br>A leading infrastructure investment holding with diverse subsidiaries in airport management, construction, port operations, energy, real estate, water services, and more | Construction | 🇹🇷 Ankara | 273 | 1976 |

## 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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- [The largest companies in Ankara](https://www.tamtam.ai/l/largest-companies-ankara) (314)
- [Multinational companies in Ankara](https://www.tamtam.ai/l/multinational-companies-ankara) (57)
- [Manufacturers in Ankara](https://www.tamtam.ai/l/manufacturers-ankara) (52)
- [Companies with in-house R&D in Ankara](https://www.tamtam.ai/l/r-and-d-companies-ankara) (48)
- [Public sector organisations in Ankara](https://www.tamtam.ai/l/public-sector-organisations-ankara) (46)
- [Corporate groups and holding companies in Ankara](https://www.tamtam.ai/l/holding-companies-ankara) (40)
- [Energy companies in Ankara](https://www.tamtam.ai/l/energy-companies-ankara) (37)
- [Education providers in Ankara](https://www.tamtam.ai/l/education-companies-ankara) (32)
- [Construction companies in Ankara](https://www.tamtam.ai/l/construction-companies-ankara) (29)
- [Hardware manufacturers in Ankara](https://www.tamtam.ai/l/hardware-companies-ankara) (28)
- [Aerospace and defence companies in Ankara](https://www.tamtam.ai/l/aerospace-and-defense-companies-ankara) (26)

## The same list elsewhere in Turkey

- [Critical infrastructure operators in Turkey](https://www.tamtam.ai/l/critical-infrastructure-operators-turkey) (282)
- [Critical infrastructure operators in Istanbul](https://www.tamtam.ai/l/critical-infrastructure-operators-istanbul) (133)

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Source: https://www.tamtam.ai/l/critical-infrastructure-operators-ankara