| # | Company | Employees |
|---|---|---|
| 1 |
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 |
| 2 |
TÜBİTAK BİLGEMen.bilgem.tubitak.gov.tr
A national R&D center specializing in information security, advanced electronics, and IT technologies through strategic partnerships, developing high-value technologies and products for competitiveness |
2,230 |
| 3 |
hepsiJEThepsijet.com
An online platform for convenient and extensive shopping, offering a wide range of products and services to customers |
1,533 |
| 4 |
IBTECH A.S.ibtech.com.tr
Development and continuous enhancement of modular core banking software, direct banking platforms, CRM, BI, and infrastructure management solutions for financial institutions. |
1,313 |
| 5 |
TUBITAK MARMARA ARASTIRMA MERKEZImam.tubitak.gov.tr
Leading research center focusing on science and technology manufacturing, offering solutions to public, defense, private, and academic sectors with research, development, innovation, and consulting services |
740 |
| 6 |
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 |
| 7 |
Alarko Carrier Sanayi ve Ticaret A.Ş.alarko-carrier.com.tr
A leading provider of heating, cooling, air conditioning, and water pressurization solutions through manufacturing, trade, marketing, training, and customer services |
509 |
| 8 |
TORUN Metaltorunmetal.com
Provider of high-quality brass, aluminum, magnesium, and stainless steel processing solutions globally, prioritizing technology, innovation, and ethical values |
489 |
| 9 |
HEKTAŞ TİCARET T.A.Ş.hektas.com.tr
Agricultural industry leader specializing in plant protection, nutrition, seeds, animal health, pet food, and care products with a focus on smart agriculture |
415 |
| 10 |
Onko Koçsel Pharmaceuticalsonkokocsel.com
Specializing in introducing blood derivative products, we have been a leading distributor for reputable European pharmaceutical companies since 1987 |
377 |
| 11 |
Sarkuysan Elektrolitik Bakır Sanayi ve Tic A.Şsarkuysan.com
Leader in copper fabrication, producing a wide range of products for various industries, with international reach and subsidiaries in multiple countries |
349 |
| 12 |
LORİSlorisparfum.com
A leading Turkish brand since 2006, specializing in perfume production with a focus on quality and Ministry of Health approval |
324 |
| 13 |
Gebze Belediyesigebze.bel.tr
Located in a rapidly developing district between Kocaeli and Istanbul, the company operates in industries and commerce, rich in historical background |
323 |
| 14 |
ARÇELİK-LGlinkedin.com
A joint venture established in 1999 for producing air conditioners, the largest integrated factory in Turkey with a production capacity of 25 million units |
261 |
| 15 |
Bilişim Vadisibilisimvadisi.com.tr
Leading innovation hub in Turkey, fostering tech development with state-of-the-art facilities and resources for startups and established tech companies |
240 |
| 16 |
Özel Yüzyıl Hastanesiyuzyilhastanesi.com
Provider of high-quality and reliable healthcare services with advanced medical technologies, offering multidisciplinary treatments in various specialties to ensure patient satisfaction and well-being |
212 |
| 17 |
Olimpia Oto Cam | Auto Glassolimpia.com.tr
Provider of high-quality auto glass services since 1964, offering a wide range of solutions in the automotive industry |
189 |
| 18 |
KALE OTO RADYATÖRkaleoto.com.tr
Leader in manufacturing engine cooling and heating radiators, condensers, and HVAC systems for automotive, industrial, and agricultural sectors in Turkey |
183 |
| 19 |
Egesim Groupegesim.com
Specializing in industrial electrical, automation systems, and geothermal power plant EPC services, providing AC-DC automation and drive systems globally |
182 |
| 20 |
Linde Gaz Türkiyelindegazmarket.com
A global provider of industrial gases and engineering solutions, supporting various industries with high-quality products, technologies, and services for productivity and sustainability |
177 |
| 21 |
Efesan Grupefesan.com.tr
Specializing in manufacturing plain bars and ribbed iron, expanding into casting, logistics, real estate development, and construction industries for growth and development |
170 |
| 22 |
Yore Groupyoregroup.com
Yöre Grup is a diversified conglomerate with a focus on regional breakfast food production, retail/wholesale sales, sports apparel, construction, and marketing |
163 |
| 23 |
Belgin Oilbelginoil.com
Specializing in human-centered industrial solutions, the company develops products in its advanced R&D lab, focusing on quality, expertise, and personalized service for over 65 years |
154 |
| 24 |
GOSB (Gebze Organize Sanayi Bölgesi)gosb.com.tr
Established in 1986 to discipline industry, the company operates under a unique "build-operate" model without relying on state funding It offers services comparable to industrial parks in developed countries They aim to bring their innovative industrial park model to different countries, enhancing Turkey's global reputation |
152 |
| 25 |
Greenwich Coffeegreenwichcoffee.com
Operates with self-service, experienced staff, and a focus on customer satisfaction, growing institutionally while prioritizing quality. |
42 |
| 26 |
Updigoupdigo.com
An e-commerce platform selling stylish shoes, clothing, accessories, and equipment from world-renowned sports brands |
5 |
Turn this list into pipeline
Tamtam finds the decision-makers at every company on a list like this one, with verified emails, phone numbers and the buying signals that tell you when to reach out.
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 24, 2026.
The same list elsewhere in Turkey
- The largest companies in Turkey 3,351
- The largest companies in Istanbul 1,310
- The largest companies in Ankara 303
- The largest companies in Izmir 141
- The largest companies in Bursa 75
- The largest companies in Antalya 50
- The largest companies in Gaziantep 37
- The largest companies in Kocaeli 34
- The largest companies in Sarıyer 32
- The largest companies in Kadıköy 30
- The largest companies in Manisa 28
- The largest companies in Mersin 27