Company lists · Data refreshed September 2026

Top 25 IT systems integration firms based in Türkiye

Name: IT systems integration firms based in Türkiye
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 643 companies tracked

RevenueBase identified 643 IT systems integration firms headquartered in Türkiye as of September 2026 and tracks 10,502 professional contacts across them, including 3,103 with verified work emails. Istanbul is the largest hub.

This list covers IT systems integration firms headquartered in Türkiye, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 28, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 28, 2026 86% judged on-target in blind review

643Companies

10,502Contacts tracked

3,103Verified emails

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The 25 largest IT systems integration firms based in Türkiye

Ranked by team size

Top 25 of 643 IT systems integration firms based in Türkiye, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to IT systems integration firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Koçsistem	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 28, 2026	501-1,000	1,464 contacts →
	Indirect evidence “KoçSistem is the leader in information technologies pioneering the sector since 1945, serving both in Turkey and in more than 30 countries from Azerbaijan to Saudi Arabia, from…” Source: RevenueBase Database · checked Sep 28, 2026
2	Mikrolink	Partial evidence	İstanbul, TürkiyeHQ checked Sep 28, 2026	1,001-5,000	426 contacts →
	Partial evidence “Mikrolink is a global systems integrator offering integrated solutions in telecommunications, data center technologies, and information & communication technologies (ICT).” Source: RevenueBase Database · checked Sep 28, 2026
3	BTC Bilişim Hizmetleri	Indirect evidence	İçerenköy, TürkiyeHQ checked Sep 28, 2026	201-500	416 contacts →
	Indirect evidence “1995’te Eresoft adıyla kurulan ve 1997’de SAP’nin Türkiye’deki ilk yerel iş ortağı olan şirketimiz, 2005 yılında 10 farklı ülkede faaliyet gösteren BTC Group bünyesine katılarak…” Source: RevenueBase Database · checked Sep 28, 2026
4	Teknoser	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 28, 2026	501-1,000	400 contacts →
	Indirect evidence “1998 yılında kurulan Teknoser, günümüzde bilgi ve iletişim teknolojileri pazarının önde gelen sistem entegrasyon ve saha hizmetleri firmasıdır.” Source: RevenueBase Database · checked Sep 28, 2026
5	VBT Software	Indirect evidence	Atasehir, TürkiyeHQ checked Sep 28, 2026	201-500	309 contacts →
	Indirect evidence “VBT is a technology company which established by a dedicate group of experts and gives support in international area.” Source: RevenueBase Database · checked Sep 28, 2026
6	Keydata Bi̇lgi̇ İşlem Teknoloji̇ Si̇stemleri̇ A.Ş	Indirect evidence	Ankara, TürkiyeHQ checked Sep 28, 2026	1,001-5,000	273 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
7	Bilgi Birikim Sistemleri	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 28, 2026	201-500	271 contacts →
	Indirect evidence “1992 yılında, üniversite döneminden birbirlerini tanıyan 5 kurucu ortak tarafından kurulan Bilgi Birikim Sistemleri; bugün ülkemizin en önemli Bilgi Teknolojileri sistem…” Source: RevenueBase Database · checked Sep 28, 2026
8	NGN	Partial evidence	İstanbul, TürkiyeHQ checked Sep 28, 2026	1,001-5,000	196 contacts →
	Partial evidence “NGN, one of the leading companies in the IT sector in Turkey, has been providing end-to-end professional solutions to meet all needs of the companies in the field of informatics…” Source: RevenueBase Database · checked Sep 28, 2026
9	AKTEK	Indirect evidence	İstanbul, TürkiyeHQ checked Sep 28, 2026	51-200	184 contacts →
	Indirect evidence “Akkök Holding'in bilgi teknolojileri ihtiyaçlarını karşılamak amacıyla 2007 yılında kurulan Aktek Bilişim, hizmet verdiği süre dahilinde paydaşlarına, iş ortaklarına ve…” Source: RevenueBase Database · checked Sep 28, 2026
10	Data Market	Partial evidence	İstanbul, TürkiyeHQ checked Sep 28, 2026	201-500	169 contacts →
	Partial evidence “About Us Being a solution provider and system integrator since 1992, Data Market which is one of the leading companies in information industry in Turkey is the information…” Source: RevenueBase Database · checked Sep 28, 2026
11	Sentim Bilişim Teknolojileri San. VE Tic. A.Ş	Indirect evidence	İstanbul, TürkiyeHQ checked Sep 28, 2026	51-200	137 contacts →
	Indirect evidence “Sentim Information Technologies is one of the leading companies that introduced the computer technologies in Turkey and pioneered the development and spread of the same in the…” Source: RevenueBase Database · checked Sep 28, 2026
12	Prime Sistem VE Teknoloji A.Ş	Indirect evidence	Ankara, TürkiyeHQ checked Sep 28, 2026	201-500	130 contacts →
	Indirect evidence “Prime Teknoloji, 30 yılı aşkın bilgi birikimi ve deneyimiyle, Türkiye genelinde 81 ildeki yaygın destek ve hizmet ağıyla özel sektör ve kamu müşterilerine uçtan uca teknoloji…” Source: RevenueBase Database · checked Sep 28, 2026
13	Sekom A.S	Strong evidence	Ankara, TürkiyeHQ checked Sep 28, 2026	51-200	129 contacts →
	Strong evidence “Sekom, over 20 years of experience as a system integrator in the field of IT technologies is a market leader in networking, unified communications, service provider video systems…” Source: RevenueBase Database · checked Sep 28, 2026
14	BIS	Partial evidence	Istanbul, TürkiyeHQ checked Sep 28, 2026	51-200	125 contacts →
	Partial evidence “Founded in 1994, BIS is a leading technology and service provider delivering packaged application solutions as well as custom software development, frameworks, integration…” Source: RevenueBase Database · checked Sep 28, 2026
15	Telekom Telekominikasyon DIS Tic.A.S	Partial evidence	İzmir, TürkiyeHQ checked Sep 28, 2026	11-50	121 contacts →
	Partial evidence “Our company is mainly a system integrator specialized in the fields of electronics, RF communications and security technologies.” Source: RevenueBase Database · checked Sep 28, 2026
16	Locksmith Software Technologies	Indirect evidence	Ankara, TürkiyeHQ checked Sep 28, 2026	51-200	117 contacts →
	Indirect evidence “Locksmith Software Technologies commenced its operations with the aim of producing most suitable and highest quality information technology solutions for its customers.” Source: RevenueBase Database · checked Sep 28, 2026
17	Bimsa Uluslararası İş, Bilgi VE Yönetim Sistemleri	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 28, 2026	201-500	102 contacts →
	Indirect evidence “1975 yılında Sabancı Holding bünyesinde kurulan BİMSA, 40 yıllık deneyimi ile Türkiye’nin önde gelen bilgi teknolojisi şirketlerindendir.” Source: RevenueBase Database · checked Sep 28, 2026
18	MC Sistem	Indirect evidence	Çankaya Mahallesi, TürkiyeHQ checked Sep 28, 2026	201-500	101 contacts →
	Indirect evidence “MCSistem elektromekanik sistem entegrasyonu yapan bir kuruluştur.” Source: RevenueBase Database · checked Sep 28, 2026
19	Partnera Consulting	Partial evidence	Üsküdar, TürkiyeHQ checked Sep 28, 2026	51-200	94 contacts →
	Partial evidence “Partnera is an IT consulting company with a wide range of know-how covering business processes across different industries.” Source: RevenueBase Database · checked Sep 28, 2026
20	Deka Technology	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 28, 2026	51-200	90 contacts →
	Indirect evidence “Deka Technology, started in Istanbul as a small company with the desire for being the best in its area, is here for companies around the world since 2017.” Source: RevenueBase Database · checked Sep 28, 2026
21	IST Systems	Partial evidence	Istanbul, TürkiyeHQ checked Sep 28, 2026	201-500	84 contacts →
	Partial evidence “IST Systems, İstanbul Yeni Havalimanı için ICT altyapı, havacılık sistemleri tasarımı ve uygulanması amacıyla 2018 yılında kuruldu.” Source: RevenueBase Database · checked Sep 28, 2026
22	4s Bilgi Teknolojileri	Indirect evidence	Ankara, TürkiyeHQ checked Sep 28, 2026	51-200	84 contacts →
	Indirect evidence “Türkiye’de bilişim sektörünün önde gelen firmalarından 4S Bilgi Teknolojileri 1996 yılında Ankara’da kurulmuştur.” Source: RevenueBase Database · checked Sep 28, 2026
23	Infera Teknoloji	Partial evidence	Ankara, TürkiyeHQ checked Sep 28, 2026	51-200	82 contacts →
	Partial evidence “Sistem Entegrasyon \| Yazılım Geliştirme \| Veri Merkezi Çözümleri \| IT Güvenlik Çözümleri \| Danışmanlık Servisleri” Source: RevenueBase Database · checked Sep 28, 2026
24	Ateksis	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 28, 2026	51-200	74 contacts →
	Indirect evidence “Since 1998, Ateksis has been providing technologies that combine innovation, quality and reliability.” Source: RevenueBase Database · checked Sep 28, 2026
25	BDH	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 28, 2026	1,001-5,000	68 contacts →
	Indirect evidence “Türkiye’nin lider sistem entegratörü Netaş’ın %100 bağlı ortaklığı olan BDH (Bilişim Destek Hizmetleri) olarak sertifikalı uzman kadromuzla, tüm sektörlere ve her ölçekteki kuruma…” Source: RevenueBase Database · checked Sep 28, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: IT systems integration firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names IT systems integration firms.
Partial evidence: Its own public description names part of IT systems integration firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name IT systems integration firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 643 IT systems integration firms based in Türkiye

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IT systems integration firms based in Türkiye at a glance

As of Sep 28, 2026

29.5%Verified-email coverage

16.3Average contacts per company

11-50Median size (employees)

36.2%Largest-city concentration · Istanbul

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

282

11-50

262

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured worldwide rather than for Türkiye, so it is reported there. Company counts and contact totals on this page are exact for Türkiye, over 643 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among IT systems integration firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Türkiye whose own description of what they do matches “IT systems integration firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names IT systems integration firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among IT systems integration firms, and records with no verified work email. Companies headquartered outside Türkiye are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 3,103 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 28, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

IT systems integration firms by metro

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names IT systems integration firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many IT systems integration firms are there based in Türkiye?

RevenueBase identified 643 IT systems integration firms headquartered in Türkiye as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Koçsistem, headquartered in Unalan Mah. Uskudar Istanbul Turkiye, tops this list with the largest team on record.

Which city has the most IT systems integration firms?

Istanbul leads with 233 headquartered companies, followed by Ankara (69) and Cankaya (22).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 3,103 verified decision-maker contacts tracked across these 643 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 28, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.