These Istanbul-based companies with in-house R&D span diverse sectors, primarily large groups and established firms. Anadolu Group is a multinational conglomerate, Turkcell provides telecommunication services, Trendyol Group is an e-commerce company, and Arçelik Türkiye manufactures consumer durables. Farmasi produces beauty and personal care products, while DeFacto is a global fashion brand.
The list reveals a mix of traditional manufacturing and modern technology sectors. Several companies, such as Arçelik Türkiye and Şişecam, have a strong manufacturing presence. Additionally, there is a notable cluster of companies founded in the mid to late 20th century, indicating a history of industrial development.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Anadolu Groupanadolugroup.com
A multinational group operating in 7 sectors, with partnerships with leading global brands, linking Anatolia to the world |
36,225 | |||
| 2 |
Turkcellturkcell.com.tr
A converged telecommunication and technology services provider based in Turkey, offering voice, data, TV, and value-added services on mobile and fixed networks globally |
16,035 | |||
| 3 |
Trendyol Grouptrendyol.com
A highly successful e-commerce company backed by multiple investors, delivering millions of packages daily across 27 countries with a strong focus on technology and innovation |
11,722 | |||
| 4 |
Arçelik Türkiyearcelikglobal.com
A global producer and marketer of consumer durables and electronics with manufacturing facilities in 7 countries, sales in 33 countries, and 30,000 employees |
11,670 | |||
| 5 |
Farmasifarmasi.com
An international beauty and personal care manufacturer with a wide range of products, including cosmetics, fragrances, personal care, wellness, and household items |
8,541 | |||
| 6 |
DeFactodefacto.com.tr
Established in 2005, the company is a global fashion brand with over 500 stores and online operations serving millions of customers worldwide They focus on sustainable practices and technology innovation |
8,236 | |||
| 7 |
Şişecamsisecam.com
Global player in glass and chemicals industry, operating in all core glass production areas, including flat glass, glassware, glass packaging, and glass fiber |
8,006 | |||
| 8 | 6,989 | ||||
| 9 |
Kuveyt Turk Participation Bankkuveytturk.com.tr
Specializing in interest-free finance with a customer-focused approach, innovative technology, and digital transformation Leading in asset size and Islamic banking, supporting mega projects and entrepreneurship |
6,740 | |||
| 10 |
TOFAStofas.com.tr
Turkish automotive company, R&D center, vehicle production for multiple brands, domestic market representation for various luxury automotive brands. |
5,996 | |||
| 11 |
Eczacıbaşı Topluluğueczacibasi.com.tr
Founded in 1942, the group operates in various industries such as bathroom, ceramics, consumer products, health, finance, and technology, contributing to societal development and sustainability |
5,960 | |||
| 12 |
Abdi Ibrahim Pharmaceuticalsabdiibrahim.com.tr
Leader in Turkish pharmaceutical industry since 1912, with a large product portfolio, global presence, strong R&D focus, and commitment to sustainability |
5,174 | |||
| 13 |
Tüpraştupras.com.tr
Refines crude oil, distributes fuel, transports goods, trades oil products, generates electricity, and invests in energy transition solutions. |
5,108 | |||
| 14 |
Mercedes-Benz Türk A.Ş.mercedesbenzturk.com.tr
Manufacturing intercity and city buses, heavy-duty trucks, and tractor units. Conducting R&D for Daimler Truck AG's global development and production network. |
4,867 | |||
| 15 |
BSH Ev Aletleri Türkiyebsh-group.com
A global white goods manufacturer with innovative products, 39 factories, and 80 companies in 50 countries, focusing on energy efficiency and innovation |
4,579 | |||
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 |
Yapı Merkezi Holdingyapimerkezi.com.tr
An organization focused on creating and realizing construction projects globally with a commitment to quality, innovation, beauty, and respect for communities |
4,231 | |||
| 17 |
Hepsiburada (NASDAQ: HEPS)hepsiburada.com
Leading e-commerce platform in Turkey with 50 million members and 1007k active merchants Offers vast selection, competitive prices, and efficient delivery services |
4,036 | |||
| 18 |
Yıldız Technical Universityedu.tr
Established in 1911, an old and reputable Turkish university in Istanbul, offering various faculties and vocational schools for higher education to thousands of students. |
3,598 | |||
| 19 |
Bosch Türkiyebosch.com.tr
A company operating in Turkey since 1910 with factories in Bursa, focusing on mobility, industrial technologies, consumer goods, energy, and building technologies |
3,114 | |||
| 20 |
Kariyer.netkariyer.net
A leading online employment platform in Turkey connecting job seekers and employers through innovative technologies Over 28 million resumes available Serving nationwide with 400+ employees |
3,014 | |||
| 21 |
DEVA Holding A.Ş.deva.com.tr
A leading pharmaceutical manufacturer specializing in human and veterinary medicine, cologne, and medical ampoule production, with a focus on innovation and global reach |
2,977 | |||
| 22 |
MARTUR FOMPAK Internationalmarturfompak.com
Design and manufacture of automotive seating systems, foam, and interior trim components for passenger cars and light commercial vehicles. |
2,836 | |||
| 23 |
İstanbul Aydin Universityaydin.edu.tr
A university in Istanbul offering modern campus life, practical training, international opportunities, advanced technology access, and a focus on scientific research |
2,788 | |||
| 24 |
Karelkarel.com.tr
Leading technology firm in Türkiye excelling in defense industry, communication systems, automotive technologies, electronic production, and emerging technologies with a focus on innovation and R&D |
2,666 | |||
| 25 |
Nobel Ilac A.Snobel.com.tr
A pharmaceutical organization developing and manufacturing a wide range of quality products for various health needs globally since 1964 |
2,586 | |||
| 26 |
Koçtaşkoctas.com.tr
A leading home improvement retailer in Turkey, offering a wide range of products through physical stores, e-commerce, and mobile app for an enhanced customer experience |
2,446 | |||
| 27 |
Softtechsofttech.com.tr
A technology innovator with a focus on creating products that enhance quality of life, fostering in-house entrepreneurship, and supporting startups |
2,375 | |||
| 28 |
Evyapevyap.com.tr
A leading manufacturer of personal care and hygiene products, exporting to over 100 countries, known for quality soap, shower gels, skincare, and more |
2,298 | |||
| 29 |
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 | |||
| 30 |
Innovainnova.com.tr
Leading Turkish IT solutions provider with 1400 professionals offering platform-independent solutions in various sectors, exporting solutions to 33 countries across 3 continents |
2,115 | |||
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 Nov 12, 2026.
More company lists in Istanbul
- The largest companies in Istanbul 1,393
- Multinational companies in Istanbul 348
- Manufacturers in Istanbul 249
- Retail chains in Istanbul 188
- Companies with a mobile app in Istanbul 163
- Corporate groups and holding companies in Istanbul 134
- Critical infrastructure operators in Istanbul 133
- E-commerce companies in Istanbul 93
- Education providers in Istanbul 93
- Financial services firms in Istanbul 81
- Hotel and hospitality groups in Istanbul 73
- Retail companies in Istanbul 71
- IT Services and IT Consulting companies in Istanbul 69
- Consumer goods companies in Istanbul 68
- Hardware manufacturers in Istanbul 66
- Energy companies in Istanbul 64
- Publicly traded companies in Istanbul 62
- Food and beverage companies in Istanbul 61
- Construction companies in Istanbul 59
- Food and Beverage Services companies in Istanbul 54
- Logistics companies in Istanbul 53
- IT services companies in Istanbul 50
- Financial Services companies in Istanbul 47
- Hospitals and Health Care companies in Istanbul 46