| # | Company | Employees |
|---|---|---|
| 1 |
Koç Holdingkoc.com.tr
Leading Turkish investment holding group with strong presence in energy, automotive, consumer durables, and finance sectors, ranked in Fortune Global 500 |
69,971 |
| 2 |
Anadolu Groupanadolugroup.com
A multinational group operating in 7 sectors, with partnerships with leading global brands, linking Anatolia to the world |
36,225 |
| 3 |
Sabanci Holdingsabanci.com
Conglomerate with diverse interests in banking, finance, energy, industrials, building materials, and retail, focusing on sustainability and global partnerships. |
22,437 |
| 4 |
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 |
| 5 |
Enerjisaenerjisa.com.tr
Leading in electricity distribution and sales, providing services to millions of customers, investing in sustainability, creating value for partners and community |
5,364 |
| 6 |
Tüpraştupras.com.tr
Refines crude oil, distributes fuel, transports goods, trades oil products, generates electricity, and invests in energy transition solutions. |
5,108 |
| 7 |
Toggtogg.com.tr
A collaboration aiming to create a global mobility brand focused on designing electric and connected vehicles to build a sustainable future |
4,918 |
| 8 |
Kazancı Holding A.Ş.kazanciholding.com.tr
A diversified group involved in energy production, distribution, and sales, as well as agriculture and tourism, contributing significantly to the economy |
4,592 |
| 9 |
Borusan Holdingborusan.com
Leading industrial conglomerate in steel, energy, logistics, distributorship, automotive, manufacturing, engineering, with focus on innovation and social responsibility. |
4,560 |
| 10 |
Arkas Holdingarkas.com.tr
An international holding providing integrated logistics services, maritime operations, port services, and operating in various sectors such as automotive and tourism |
4,290 |
| 11 |
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 |
| 12 |
Akkök Holdingakkok.com.tr
Established in 1952, a leading organization in the fields of chemicals, energy, and real estate, with a focus on global competition and achieving world-class standards |
3,692 |
| 13 |
Sanko Holdingsanko.com.tr
A longstanding industrial leader in Turkey, specializing in textiles, renewable energy, cement, and packaging production Committed to social development and global presence |
3,248 |
| 14 |
SOCAR Türkiyesocar.com.tr
Leading in energy sector with investments in petrochemicals, refining, natural gas trading, distribution, and storage, supporting economic cooperation between Azerbaijan and Turkey |
2,926 |
| 15 |
Limak Group of Companieslimak.com.tr
A diversified group involved in various sectors including construction, tourism, cement, energy, aviation, and food with a focus on social investments |
2,869 |
| 16 |
Petrol Ofisipetrolofisi.com.tr
A leading provider of fuel, lubricants, and chemicals in Turkey, with a strong infrastructure including fuel stations, terminals, and storage capacity |
2,733 |
| 17 |
OPETopet.com.tr
A leading petroleum distributor with 1600+ stations, offering retail, commercial, and industrial fuels, mineral oils, storage, and international trade |
2,703 |
| 18 |
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 |
| 19 |
KOLIN Constructionkolin.com.tr
A global player in construction and energy sectors with a 15 billion dollar turnover, known for major infrastructure projects worldwide |
2,560 |
| 20 |
Türkiye Petrolleri A.O.tpao.gov.tr
A global energy exploration and production company with 68 years of experience operating in multiple countries, specializing in unconventional exploration and pipeline transportation |
2,475 |
| 21 |
DSI - General Directorate of State Hydraulic Worksdsi.gov.tr
Primary executive agency in Turkey responsible for managing surface and ground water for hydropower, irrigation, domestic, and industrial use since 1914 |
2,425 |
| 22 |
Zorlu Holdingzorlu.com.tr
A diversified group with a strong corporate structure, operating in textile, electronics, energy, real estate, mining, and other sectors, focusing on sustainability and innovation |
2,283 |
| 23 |
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 |
| 24 |
Yıldızlar Yatırım Holdingyildiz.com
Operating across eight sectors with over 5,000 employees and stakeholders, contributing significantly to the national economy. |
2,043 |
| 25 |
Dicle Elektrikdedas.com.tr
We provide electricity distribution services to a population of approximately 6 million in southeastern Turkey, with an extensive network and technological innovations for reliable supply |
1,933 |
| 26 |
TP-OTCtp-otc.com
Engineering and technology services for offshore operations in the oil and gas industry, focusing on enhancing safety and efficiency |
1,895 |
| 27 |
Çalık Enerjicalikenerji.com
Leading energy organization specializing in implementing successful projects globally using innovative solutions and state-of-the-art technologies for a sustainable future |
1,868 |
| 28 |
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 |
| 29 |
TPIC - Turkish Petroleum International Anonim Şirketitpic.gov.tr
An international petroleum company operating in various sectors such as drilling services, seismic services, field services, and oil trading to contribute to Turkey's energy security and welfare |
1,853 |
| 30 |
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 |
| 31 |
Tosyalı Holdingtosyaliholding.com.tr
A leading private sector investor in the iron and steel industry with 18 facilities across 3 continents, offering unique career opportunities in a supportive, innovative, and collaborative work environment |
1,691 |
| 32 |
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 |
| 33 |
Aksa Natural Gasaksadogalgaz.com.tr
The company operates in natural gas distribution and wholesale business, as well as compressed natural gas transmission in Turkey |
1,647 |
| 34 |
Karadeniz Holdingkaradenizholding.com
Conglomerate with the world's first and only floating power plant fleet, providing immediate access to sustainable, reliable electricity across four continents. |
1,644 |
| 35 |
CK Enerjickenerji.com.tr
A leading energy provider in Turkey, serving 84 million electricity consumers in seven provinces with distribution, sales, and retail services, investing in workforce and infrastructure |
1,619 |
| 36 |
Enerjisa Üretimenerjisauretim.com.tr
We produce energy for a better future, focusing on respect for life and operational excellence with a diverse portfolio in Turkey |
1,535 |
| 37 |
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 |
| 38 |
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 |
| 39 |
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 |
| 40 |
Cengiz Holdingcengizholding.com.tr
Major player in highly competitive industries, specializing in infrastructure projects, energy, mining, power generation, and metal manufacturing with significant investments and annual revenue exceeding USD 5 billion |
1,441 |
| 41 |
Aygazaygaz.com.tr
A leading player in the energy sector specializing in LPG distribution, manufacturing of LPG equipment, and marketing of LPG-operated devices |
1,419 |
| 42 |
İçdaşicdas.com.tr
One of Turkey's leading private sector steel producers with a diverse range of operations including steel production, energy, logistics, shipbuilding, construction, and more |
1,401 |
| 43 |
Boğaziçi Elektrik Dağıtım A.Ş.bedas.com.tr
Provider of electricity distribution services in Istanbul and surrounding areas since 1970, meeting the increasing energy demand through quality and uninterrupted service |
1,375 |
| 44 |
Kalyon Holdingkalyonholding.com
A diversified organization with operations in construction, energy, real estate, concessions, and education, experiencing rapid global growth since 1944 |
1,299 |
| 45 |
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 |
| 46 |
Fernasfernas.com.tr
Founded in 1982, this construction firm has completed various projects internationally, including industrial plants, pipelines, dams, and infrastructure construction |
1,255 |
| 47 |
Kalyon Construction Groupkalyonholding.com
Established in 1974, this organization is a top player in Turkey's construction sector, known for quality, trust, innovation, and efficient project management |
1,249 |
| 48 |
Aksa Enerji Üretim A.Ş.aksaenerji.com.tr
A leading independent power producer operating globally, creating and operating power plants using various energy sources in multiple countries |
1,215 |
| 49 |
ASTOR A.Ş.astoras.com.tr
Leading manufacturer in the electromechanical industry sector, specializing in transformers and switchgear products, with a focus on quality, innovation, and global presence |
1,127 |
| 50 |
Ağaoğlu Şirketler Grubuagaoglu.com.tr
A leading group in construction, real estate, energy, and tourism sectors Specializing in high-quality residential and office projects for discerning buyers |
1,110 |
| 51 |
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 |
| 52 |
Sirte Oil Company for Production, Manufacturing of Oil and Gassirteoil.com.ly
Specializes in oil and gas production and manufacturing, based in Libya |
1,062 |
| 53 |
Zorlu Energy Groupzorluenerji.com.tr
A leading player in the energy sector, with a diverse portfolio of power plants both domestically and internationally, focusing on renewable energy sources |
1,049 |
| 54 |
EAE Groupeaeelectric.com
A global group of companies, focused on designing and manufacturing electrical distribution systems, LED lighting products, machinery, and electrical technologies for various industries worldwide |
1,018 |
| 55 |
İGDAŞ | İstanbul Gaz Dağıtım Sanayi ve Ticaret AŞigdas.istanbul
The company distributes natural gas in Istanbul, aiming to provide a clean and economical energy source to improve air quality and public health |
989 |
| 56 |
Gdz Elektrikgdzelektrik.com.tr
Delivering sustainable and quality electricity distribution services through innovative technological solutions in a wide service area with millions of consumers |
979 |
| 57 |
BEST Transformerbesttransformer.com
Manufacturer of oil immersed distribution transformers, power transformers, cast resin transformers, reactors, and mechanical components for domestic and international markets |
945 |
| 58 |
Sinpaş Holdingsinpas.com.tr
A leading group with innovative vision and reliability, operating in real estate, industry, services, finance, and energy sectors with over 3000 employees |
933 |
| 59 |
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 |
| 60 |
Ata Holdingataholding.com.tr
Global group with food investments serving with 5 global brands and 3 national brands, as well as owning factories, logistics services, and diverse sector companies |
895 |
| 61 |
DILER HOLDINGdilerhld.com
Business conglomerate operating in steel production, foreign trade, energy, shipping, port operation, mining, banking, and tourism sectors in Turkey since 1949 |
894 |
| 62 |
YEDAŞ - Yeşilırmak Elektrik Dağıtım A.Ş.yedas.com
A provider of electricity distribution services to 18 million subscribers in five cities, ensuring quality and uninterrupted service in Turkey's energy sector |
858 |
| 63 |
İhlas Holdingihlas.com.tr
A prominent group in Turkey with diverse activities in media, construction, marketing, and social responsibility, including health and education services |
851 |
| 64 |
Kalyon PVkalyonpv.com
Vertically integrated solar factory producing ingots, wafers, cells, and modules alongside research and development activities for sustainable energy projects and large-scale power plants. |
846 |
| 65 |
UEDAŞuedas.com.tr
Specializing in distributing electricity to retail customers in the Marmara region, serving over 3 million subscribers and holding a significant market share in the energy distribution sector |
802 |
| 66 |
CW ENERJİcw-enerji.com
A renewable energy company specializing in solar energy, providing products and services in Europe and Turkey with a focus on quality and customer satisfaction |
791 |
| 67 |
Kipaş Holdingkipas.com.tr
A diversified holding with investments in textiles, cement, paper, energy, education, and logistics, employing 12,000 people and excelling in exports and R&D |
750 |
| 68 |
TSM ENERJİ
The company is the main contractor for the Akkuyu Nuclear Power Plant project, responsible for overseeing construction and implementation of the facility |
723 |
| 69 |
Aksa Power Generationaksa.com.tr
Global leader in manufacturing a wide range of generator sets, lighting towers, and generator hardware, focusing on innovation, sustainability, and worldwide service coverage |
714 |
| 70 |
Çimtaş Groupcimtas.com
A subsidiary with 50 years of experience provides engineering and fabrication services for construction, power, oil, gas, and chemicals industries |
708 |
| 71 |
Bayburt Groupbayburtgrup.com.tr
A diversified group of companies with operations in construction, energy, agriculture, insurance, fuel distribution, and services, focusing on sustainable growth and global presence |
702 |
| 72 |
Smart Güneş Teknolojilerismartsolar.com.tr
A leading player in the renewable energy sector, specializing in solar power plant investments and PV module production with a strong global presence |
702 |
| 73 |
Teksanteksan.com
Turkish engineering company designs and manufactures generator sets, lighting towers, cogeneration-trigeneration solutions, and hybrid power systems, exporting products to over 130 countries |
701 |
| 74 |
IC HOLDİNGicholding.com.tr
A holding company operating in construction, energy, tourism, industry, and infrastructure sectors with a focus on quality, customer satisfaction, and sustainable growth |
699 |
| 75 |
Eksim Holdingeksim.com.tr
A diversified holding with investments in food, electricity distribution, renewable energy, technology, and venture capital, employing over 10,000 people in Turkey |
698 |
| 76 |
Aytemizaytemiz.com.tr
A leading player in the fuel industry with a strong supply network and over 600 fuel stations nationwide, ensuring customer satisfaction |
692 |
| 77 |
Eren Holdingerenholding.com.tr
A diversified business group with interests in textiles, energy, paper, packaging, retail, cement, and tourism, aiming for growth through strategic investments |
691 |
| 78 |
Siro Energysiro.energy
A joint venture developing energy storage solutions for automotive and non-automotive use, with plans to reach a 20 GWh production capacity and global market expansion |
690 |
| 79 |
İpragaz A.Ş.ipragaz.com.tr
A leading provider of Liquefied Petroleum Gas (LPG) in Turkey, with over 50 years of experience and a focus on energy solutions |
667 |
| 80 |
TANAP Natural Gas Transmission Companytanap.com
Facilitating the transportation of natural gas from Azerbaijan to Turkey and Europe through the Southern Gas Corridor for increased supply security |
658 |
| 81 |
YILDIRIM GROUPyildirimgroup.com
A diversified global industrial conglomerate based in Istanbul, operating in 56 countries across 9 industries with over 25,000 employees worldwide |
657 |
| 82 |
Calik Holdingcalik.com
A multinational group operating in various sectors such as energy, construction, mining, finance, and telecommunications across 28 countries, focusing on sustainability and innovation |
656 |
| 83 |
Alarko Holdingalarko.com.tr
A diversified organization with 25 subsidiaries, 8,000 employees, and a strong presence in industries such as construction, energy, tourism, and real estate development |
656 |
| 84 |
Eneryaenerya.com.tr
Established in 2003, it is a leading private natural gas distribution company in Turkey, serving over 18 million customers in 10 cities with a focus on innovation and customer satisfaction |
635 |
| 85 | 631 | |
| 86 |
Adm Elektrikadmelektrik.com.tr
Providing sustainable, innovative electricity distribution services across a large region, serving millions with advanced technological investments and infrastructure. |
630 |
| 87 |
Aras Elektrik Dağıtım A.Ş.arasedas.com
Providing reliable electricity distribution services with a focus on maximizing employee performance to enhance customer relationships and meet energy needs |
629 |
| 88 |
Eren Enerjierenenerji.com.tr
A leading energy provider in Turkey with a focus on environmental investments, operating a thermal power plant and a port facility |
623 |
| 89 |
Polyak Eynez Enerji Üretim Madencilik San. ve Tic. A.Ş.polyakeynez.com
The company operates a coal mine and a thermal power plant to utilize local resources for energy production and contribute to a sustainable future |
604 |
| 90 |
Matlı Şirketler Grubumatli.com.tr
Leading group in 9 sectors with 25 companies, focusing on animal feed production, egg/poultry/milk production, and farming, while prioritizing innovation and sustainability |
598 |
| 91 |
Sakarya Elektrik Dağıtım A.Ş.sedas.com
The company is involved in the distribution of electricity in the Sakarya, Bolu, and Düzce regions, going through privatization in 2008 |
596 |
| 92 |
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 |
| 93 |
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 |
| 94 |
T.C. Enerji ve Tabii Kaynaklar Bakanlığıenerji.gov.tr
Official page of the Ministry of Energy and Natural Resources of the Republic of Turkey |
577 |
| 95 |
KAYA HOLDING INC.kayaholding.com.tr
Operating in multiple sectors with 8 subsidiaries and over 4,000 employees, dedicated to guest satisfaction, growth, and international expansion |
575 |
| 96 |
Aydem Enerjiaydemenerji.com.tr
A pioneering energy company in Turkey focusing on renewable energy, with a strong emphasis on employee satisfaction and environmental responsibility |
571 |
| 97 |
SUR YAPIsuryapi.com.tr
A real estate developer and construction company with a diverse portfolio including residential, commercial, and industrial projects, as well as energy investments and urban transformation projects |
571 |
| 98 |
İSTAÇistac.istanbul
A leading environmental management firm in Turkey, operating the country's first sanitary landfill site since 1994 with a focus on top-notch service quality and innovative waste management solutions |
569 |
| 99 |
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 |
| 100 |
Europower Enerji ve Otomasyon Teknolojileri San.ve Tic. A.Ş.europowerenerji.com.tr
Specializing in designing, developing, and manufacturing LV-MV-HV electrical systems, offering turn-key contracting services for power generation, transmission, and distribution projects worldwide |
563 |
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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 24, 2026.
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