| # | Company | Employees |
|---|---|---|
| 1 |
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 |
| 2 |
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 |
| 3 |
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 |
| 4 |
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 |
| 5 |
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 |
| 6 |
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 |
| 7 |
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 |
| 8 |
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 |
| 9 |
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 |
| 10 |
Tepe İnşaat Sanayi A.Ş.tepe.com.tr
A leading player in the construction industry, prioritizing top-notch solutions to meet client needs and exceed expectations in a changing world |
413 |
| 11 |
ERG İnşaat Ticaret ve Sanayi A.Ş.erg-insaat.com.tr
A construction company specializing in airport, road, bridge, dam, hydroelectric power plant, thermal power plant, irrigation, and industrial facility projects with a focus on quality and environmental sustainability |
375 |
| 12 |
Yenigün İnşaat A.Ş.yenigun.com.tr
Established in 1973, we specialize in construction projects such as housing, sports facilities, hotels, and infrastructure both in Turkey and abroad Listed as a top international contractor |
372 |
| 13 |
Dorce Prefabricated Building and Construction Industry Trade Inc.dorce.com
Global leader in prefabricated modular steel construction, offering turnkey solutions for various sectors worldwide with expertise in harsh climates and international projects |
371 |
| 14 |
GAMA Power Systemsgama.com.tr
Specializes in EPC contracting for power generation projects worldwide, offering a full range of services from engineering to start-up and maintenance |
361 |
| 15 |
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 |
| 16 |
Akçadağ Grupakcadag.com.tr
With a history dating back to 1930, we operate in the sectors of contracting, energy, mining, defense industry, construction, telecommunications, and services, continuously improving with innovation |
341 |
| 17 |
Ekon Industry Construction & Trade Inc.ekonas.com.tr
A leading provider of engineering and construction services for infrastructure and industrial projects, with expertise in all project phases Over 30 years experience |
312 |
| 18 |
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 |
| 19 |
Mekatronik Mühendislik & İnşaatmekatronikinsaat.com
Specializing in mechanical, electrical, and automation systems, the group offers high-quality services for local and international projects, ensuring efficiency and sustainability |
245 |
| 20 |
NATA Holdingnataholding.com
A group engaged in project development, construction, real estate investment, overseas contracting, manufacturing, and energy sectors, prioritizing quality, safety, and customer satisfaction |
174 |
| 21 |
Votorantim Cimentos Türkiyevotorantimcimentos.com.tr
A leading international company in the construction materials sector, specializing in cement, concrete, aggregate, and mortar production with a strong focus on professional development and excellence |
171 |
| 22 |
Bergiz Holdingbergiz.com.tr
With an experienced team and modern machinery, we strive to become the best in the industry by delivering projects on time and with high quality |
162 |
| 23 |
HGG Construction Inc.hgg.com.tr
With over 60 years of experience, the company provides general contracting services in construction and renewable energy sectors, focusing on social responsibilities and sustainable development |
161 |
| 24 |
Ilci Holdingilci.com.tr
A diversified holding group with 15 companies, leading in construction, mining, energy, agriculture, and tourism sectors, known for groundbreaking projects |
159 |
| 25 |
METAG HOLDINGmetag.com.tr
A company specializing in quality management, continuous improvement, customer satisfaction, trust building, technological advancements, and employee training to provide high-quality services |
150 |
| 26 |
Makimsan Inc.makimsan.com.tr
A construction company based in Ankara specializing in asphalt emulsion, surface coating, airport runway constructions, asphalt roads, and infrastructure projects |
147 |
| 27 |
OZTAS Construction Companyoztas.com.tr
Specializing in construction for over 30 years, our projects include pipelines, compressor stations, tunnels, subways, and complex buildings worldwide Ongoing projects in Turkey, Libya, Iran, and Georgia |
146 |
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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 Oct 9, 2026.