# Corporate groups and holding companies headquartered in Ankara

Tamtam tracks 40 corporate groups and holding companies headquartered in Ankara. This list ranks the 30 largest by number of employees on LinkedIn, led by Turk Telekom, RÖNESANS HOLDİNG and OYAK. Their median headcount is 933. Half of them were founded in 1976 or later.

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.

🇹🇷 Ankara · 30 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 | [RÖNESANS HOLDİNG](https://www.tamtam.ai/c/ronesans-holding) (ronesans.com)<br>A multinational conglomerate based in Ankara, specializing in construction, real estate, healthcare, and energy projects across Europe, Asia, and Africa | Holding Companies | 🇹🇷 Ankara | 7,087 |  |
| 3 | [OYAK](https://www.tamtam.ai/c/oyak) (oyak.com.tr)<br>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 | Financial Services | 🇹🇷 Ankara | 3,801 |  |
| 4 | [Türk Kızılay](https://www.tamtam.ai/c/turk-k-z-lay) (kizilay.org.tr)<br>A humanitarian organization founded by Turkish doctors in 1868 to provide aid to wounded soldiers on the battlefield | Non-profit Organizations | 🇹🇷 Ankara | 3,151 | 1868 |
| 5 | [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 |
| 6 | [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 |  |
| 7 | [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 |
| 8 | [Türkiye Tarım Kredi Kooperatifleri](https://www.tamtam.ai/c/turkiye-tar-m-kredi-kooperatifleri) (tarimkredi.org.tr)<br>Providing timely, reliable, high-quality agricultural products and services to meet the needs of Turkish farmers while promoting sustainable and environmentally friendly practices | Farming | 🇹🇷 Ankara | 1,890 | 1863 |
| 9 | [Çelikler Holding](https://www.tamtam.ai/c/celikler-holding-ankara) (celiklerholding.com)<br>A leading Turkish entity focused on domestic production, construction, energy generation, mining, tourism with a large workforce and successful projects | Renewable Energy Semiconductor Manufacturing | 🇹🇷 Ankara | 1,744 | 1958 |
| 10 | [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 |
| 11 | [GAMA Holding](https://www.tamtam.ai/c/gama-holding) (gama.com.tr)<br>A global leader in constructing power plants, refineries, infrastructure, and high-rise buildings, along with investments in energy, health, and tourism sectors | Industrial Machinery Manufacturing | 🇹🇷 Ankara | 1,520 |  |
| 12 | [Mapa Group](https://www.tamtam.ai/c/mapa-group) (mapa.group)<br>Multinational company specializing in construction, hospitality, renewable energy, airports, and air freight with extensive global operations and project management expertise. | Construction | 🇹🇷 Ankara | 1,500 | 1978 |
| 13 | [YDA Group](https://www.tamtam.ai/c/yda-group) (yda.com.tr)<br>A construction group with over half a century of experience in infrastructure projects, real estate development, aviation, healthcare, energy, and more | Construction | 🇹🇷 Ankara | 1,263 |  |
| 14 | [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 |
| 15 | [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 |
| 16 | [GEN](https://www.tamtam.ai/c/gen-ankara) (en.genilac.com.tr)<br>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 | Pharmaceutical Manufacturing | 🇹🇷 Ankara | 700 | 1998 |
| 17 | [Onur Group](https://www.tamtam.ai/c/onur-group) (onurgroup.com)<br>Specializing in road, airport, dam, and infrastructure projects internationally, this organization excels in timely, high-quality completion using advanced technology and skilled personnel | Construction | 🇹🇷 Ankara | 647 | 1981 |
| 18 | [Çelikler Holding](https://www.tamtam.ai/c/celikler-holding) (celiklerholding.net)<br>A diverse group operating in construction, mining, tourism, and energy sectors, specializing in projects such as infrastructure, mining production, and energy generation | Construction | 🇹🇷 Ankara | 591 |  |
| 19 | [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 |  |
| 20 | [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 |
| 21 | [Özaltın Holding](https://www.tamtam.ai/c/ozalt-n-holding) (ozaltin.com)<br>Leading organization in Turkey, specializing in construction, infrastructure projects such as dams, water treatment facilities, roads, bridges, railways, and various other sectors globally | Construction | 🇹🇷 Ankara | 561 | 1965 |
| 22 | [Yildizlar SSS Holding](https://www.tamtam.ai/c/yildizlar-sss-holding) (yildizlarsssholding.com.tr)<br>A multi-sector holding company involved in ceramics, mining, construction, and transportation with a focus on export and growth | Mining | 🇹🇷 Ankara | 524 | 2005 |
| 23 | [YILDIZLAR GRUP](https://www.tamtam.ai/c/yildizlar-grup) (yildizlar.com)<br>With over 40 years of experience, the group specializes in construction, infrastructure, and energy projects, expanding internationally while delivering high-quality work on time | Construction | 🇹🇷 Ankara | 502 | 1968 |
| 24 | [Pasifik Holding](https://www.tamtam.ai/c/pasifik-holding) (pasifik.com)<br>A diversified group with expertise in real estate, construction, logistics, international trade, manufacturing, and technology, creating value, supporting exports, and fostering economic development | Holding Companies | 🇹🇷 Ankara | 484 | 2008 |
| 25 | [Mesa Holding](https://www.tamtam.ai/c/mesa-holding) (mesaholding.com.tr)<br>A multifaceted organization embracing innovation, technology, and social responsibility, with specialties in construction, agriculture, energy, tourism, and more, founded in 1969 in Istanbul | Construction | 🇹🇷 Ankara | 479 | 1969 |
| 26 | [Çiftay A.Ş.](https://www.tamtam.ai/c/ciftay-a-s) (ciftay.com.tr)<br>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 | Mining | 🇹🇷 Ankara | 438 | 1963 |
| 27 | [AKO Grup](https://www.tamtam.ai/c/ako-grup) (akogrup.com)<br>A continuously evolving organization with a team of nearly 2000 experienced professionals, combining industry expertise with new technologies for rapid growth | Motor Vehicle Manufacturing | 🇹🇷 Ankara | 427 | 1955 |
| 28 | [ŞA-RA Şirketler Grubu](https://www.tamtam.ai/c/sa-ra-sirketler-grubu) (sara.com.tr)<br>Established in 1985, we operate globally in energy, construction, and tourism sectors, delivering high-quality projects with sound financial and technical capabilities | Electric Power Transmission, Control, and Distribution | 🇹🇷 Ankara | 365 | 1985 |
| 29 | [ANKARA](https://www.tamtam.ai/c/ankara) (setas.net.tc)<br>Specializing in electricity and natural gas services, providing essential energy solutions to our customers with a focus on reliability and sustainability | Oil and Gas | 🇹🇷 Ankara | 359 |  |
| 30 | [Gürbağ Group](https://www.tamtam.ai/c/gurbag-group) (gurbag.com)<br>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 | Construction | 🇹🇷 Ankara | 343 | 1992 |

## 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](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)
- [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)
- [Critical infrastructure operators in Ankara](https://www.tamtam.ai/l/critical-infrastructure-operators-ankara) (29)
- [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

- [Corporate groups and holding companies in Turkey](https://www.tamtam.ai/l/holding-companies-turkey) (304)
- [Corporate groups and holding companies in Istanbul](https://www.tamtam.ai/l/holding-companies-istanbul) (134)

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Source: https://www.tamtam.ai/l/holding-companies-ankara