This list features large corporate groups and holding companies based in Ankara. Many of these firms operate across multiple sectors, reflecting a diversified economic landscape. Notable examples include RÖNESANS HOLDİNG, a multinational conglomerate in construction, real estate, healthcare, and energy, and Limak Group of Companies, involved in construction, tourism, cement, energy, aviation, and food. Turk Telekom is a major integrated telecommunications operator, and OYAK provides pension funds and services across various sectors.
A recurring pattern among these companies is their involvement in heavy industry and infrastructure. Construction, energy, and holding companies that oversee diverse portfolios are prominent. Several of these entities, such as Türk Kızılay, founded in 1868, and Turk Telekom, established in 1840, have long histories, indicating established players in the Turkish economy.
| # | 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 |
RÖNESANS HOLDİNGronesans.com
A multinational conglomerate based in Ankara, specializing in construction, real estate, healthcare, and energy projects across Europe, Asia, and Africa |
7,087 | |||
| 3 |
OYAKoyak.com.tr
A successful organization in Turkey providing complementary pension funds and high value-added services across various sectors nationally and internationally with over 390,000 members |
3,801 | |||
| 4 |
Türk Kızılaykizilay.org.tr
A humanitarian organization founded by Turkish doctors in 1868 to provide aid to wounded soldiers on the battlefield |
3,151 | |||
| 5 |
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 | |||
| 6 |
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 | |||
| 7 |
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 | |||
| 8 |
Türkiye Tarım Kredi Kooperatifleritarimkredi.org.tr
Providing timely, reliable, high-quality agricultural products and services to meet the needs of Turkish farmers while promoting sustainable and environmentally friendly practices |
1,890 | |||
| 9 |
Çelikler Holdingceliklerholding.com
A leading Turkish entity focused on domestic production, construction, energy generation, mining, tourism with a large workforce and successful projects |
1,744 | |||
| 10 |
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 | |||
| 11 |
GAMA Holdinggama.com.tr
A global leader in constructing power plants, refineries, infrastructure, and high-rise buildings, along with investments in energy, health, and tourism sectors |
1,520 | |||
| 12 |
Mapa Groupmapa.group
Multinational company specializing in construction, hospitality, renewable energy, airports, and air freight with extensive global operations and project management expertise. |
1,500 | |||
| 13 |
YDA Groupyda.com.tr
A construction group with over half a century of experience in infrastructure projects, real estate development, aviation, healthcare, energy, and more |
1,263 | |||
| 14 |
Fernasfernas.com.tr
Founded in 1982, this construction firm has completed various projects internationally, including industrial plants, pipelines, dams, and infrastructure construction |
1,255 | |||
| 15 |
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 | |||
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. | |||||
| 16 |
GENen.genilac.com.tr
Leading pharmaceutical specializing in in-licensing, out-licensing, and drug development Produces innovative therapies and competitive products for international markets with GMP-certified manufacturing facility |
700 | |||
| 17 |
Onur Grouponurgroup.com
Specializing in road, airport, dam, and infrastructure projects internationally, this organization excels in timely, high-quality completion using advanced technology and skilled personnel |
647 | |||
| 18 |
Çelikler Holdingceliklerholding.net
A diverse group operating in construction, mining, tourism, and energy sectors, specializing in projects such as infrastructure, mining production, and energy generation |
591 | |||
| 19 |
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 | |||
| 20 |
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 | |||
| 21 |
Özaltın Holdingozaltin.com
Leading organization in Turkey, specializing in construction, infrastructure projects such as dams, water treatment facilities, roads, bridges, railways, and various other sectors globally |
561 | |||
| 22 |
Yildizlar SSS Holdingyildizlarsssholding.com.tr
A multi-sector holding company involved in ceramics, mining, construction, and transportation with a focus on export and growth |
524 | |||
| 23 |
YILDIZLAR GRUPyildizlar.com
With over 40 years of experience, the group specializes in construction, infrastructure, and energy projects, expanding internationally while delivering high-quality work on time |
502 | |||
| 24 |
Pasifik Holdingpasifik.com
A diversified group with expertise in real estate, construction, logistics, international trade, manufacturing, and technology, creating value, supporting exports, and fostering economic development |
484 | |||
| 25 |
Mesa Holdingmesaholding.com.tr
A multifaceted organization embracing innovation, technology, and social responsibility, with specialties in construction, agriculture, energy, tourism, and more, founded in 1969 in Istanbul |
479 | |||
| 26 |
Çiftay A.Ş.ciftay.com.tr
Operating since 1963, the organization started with excavation and mining activities, later expanding into construction, energy, and tourism sectors with a focus on quality management systems |
438 | |||
| 27 |
AKO Grupakogrup.com
A continuously evolving organization with a team of nearly 2000 experienced professionals, combining industry expertise with new technologies for rapid growth |
427 | |||
| 28 |
ŞA-RA Şirketler Grubusara.com.tr
Established in 1985, we operate globally in energy, construction, and tourism sectors, delivering high-quality projects with sound financial and technical capabilities |
365 | |||
| 29 | 
ANKARAsetas.net.tc
Specializing in electricity and natural gas services, providing essential energy solutions to our customers with a focus on reliability and sustainability |
359 | |||
| 30 |
Gürbağ Groupgurbag.com
An experienced technical team specializing in construction projects, including residential buildings, universities, sports complexes, industrial facilities, and infrastructure such as roads and bridges Committed to quality and sustainability |
343 | |||
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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.
More company lists in Ankara
- The largest companies in Ankara 314
- Multinational companies in Ankara 57
- Manufacturers in Ankara 52
- Companies with in-house R&D in Ankara 48
- Public sector organisations in Ankara 46
- Energy companies in Ankara 37
- Education providers in Ankara 32
- Critical infrastructure operators in Ankara 29
- Construction companies in Ankara 29
- Hardware manufacturers in Ankara 28
- Aerospace and defence companies in Ankara 26