Company lists · Data refreshed September 2026
Top 25 IT audits and consulting services based in Türkiye
RevenueBase identified 310 IT audits and consulting services headquartered in Türkiye as of September 2026 and tracks 2,533 professional contacts across them, including 404 with verified work emails. Istanbul is the largest hub.
This list covers IT audits and consulting services 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 21, 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.
The 25 largest IT audits and consulting services based in Türkiye
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 93 contacts → | ||||
Indirect evidence “Vergi, Denetim, Danışmanlık” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 2 | 81 contacts → | ||||
Partial evidence “AS/Nexia Turkey is a professional auditing and consultancy company serving the leading firms in Turkey by giving independent auditing, financial advisory,full…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 3 | 74 contacts → | ||||
Indirect evidence “Natica is a technology consultancy and services firm specializing in delivering success to its clients.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 4 | 69 contacts → | ||||
Partial evidence “2017 yılında bilgi güvenliği konusunda danışmanlık, servis ve destek hizmetleri vermek amacıyla kurulan Infinitum IT, siber olaylara müdahale hizmetleri, güvenli kod…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 5 | 55 contacts → | ||||
Strong evidence “Since 1998, Güncel Group has delivered high-level independent audit, tax assurance, corporate valuation, and strategic consulting to publicly traded corporations, holdings…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 6 | 42 contacts → | ||||
Partial evidence “Company Profile Lostar Inc, founded in 1998, based in Istanbul/Turkey, provides competitive edge in an uncertain world with Business and Technology Risk Consulting.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 7 | 42 contacts → | ||||
Indirect evidence “Tetra Bilişim, yenilikçi ve önder yaklaşımı ile ülkemiz bilişim sektörüne ve bilgi güvenliğine sürekli katkı sağlamaktadır.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 8 | 38 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 9 | 37 contacts → | ||||
Indirect evidence “Değer katan bir hizmet sunmak ve bir işi büyütmek sıradan bir iş anlayışı ile gerçekleştirilemez.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 10 | 37 contacts → | ||||
Indirect evidence “Çözüm Ünlüer Bağımsız Denetim ve Yeminli Mali Müşavirlik A.Ş.| Nexia International Izmir Office | nexia.com • Bağımsız Denetim • Tam Tasdik Hizmeti • Katma Değer Vergisi İadesi •…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 11 | 29 contacts → | ||||
Partial evidence “D Tech Cloud olarak, bulut teknolojileri, IT altyapı yönetimi ve siber güvenlik alanlarında yenilikçi çözümler sunarak işletmelerin geleceğe güvenle adım atmasını sağlıyoruz.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 12 | 28 contacts → | ||||
Indirect evidence “Bağımsız Denetim Nexia Bursa; Kadrosundaki tecrübeli denetçilerden oluşan denetim ekipleriyle, Sermaye Piyasası Mevzuatına tabi kurum ve kuruluşların, Enerji Piyasasında faaliyet…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 13 | 23 contacts → | ||||
Partial evidence “Nev generation technology consulting.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 14 | 22 contacts → | ||||
Indirect evidence “ARSEN, denetim, muhasebe, vergi ve danışmanlık alanlarında hizmet veren bir kuruluştur.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 15 | 21 contacts → | ||||
Indirect evidence “EMA Security, uluslararası geçerliliğe sahip sertifikalı uzman ekibiyle, Türkiye'de siber güvenlik ve bilgi güvenliği alanlarında faaliyet gösteren yenilikçi bir danışmanlık…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 16 | 20 contacts → | ||||
Indirect evidence “Guided by our philosophy,"Whatever we do, there will always be Art within," CyberArts brings together cybersecurity, information security, governance, risk, compliance, law…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 17 | 18 contacts → | ||||
Partial evidence “Yesis Bilişim A.Ş, 2008 yılından bu yana kurumsal firmalara IT danışmanlık, sistem yönetimi, siber güvenlik ve teknoloji altyapı hizmetleri sunmaktadır.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 18 | 17 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 19 | 17 contacts → | ||||
Indirect evidence “2012 yılında kurulan Datakey, uzman kadrosu ve müşteri memnuniyetini ön planda tutan kaliteli hizmet anlayışı ile daima daha iyisini başarmıştır.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 20 | 15 contacts → | ||||
Indirect evidence “Kurumların esnek hale gelmesi, sektörlerine ve sektörlerindeki gelişmelere daha hızlı uyum sağlaması, başarı için kaçınılmaz bir gerçek.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 21 | 15 contacts → | ||||
Indirect evidence “Optimum Denetim 2011 yılında kurulmuştur.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 22 | 14 contacts → | ||||
Indirect evidence “Consulta Grubu, hizmet alanlarına göre kurumsal yapılanmasını oluşturmuş beş şirketten oluşmaktadır.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 23 | 14 contacts → | ||||
Indirect evidence “DENETIM TURKEY, which has been established for the purposes of the development of the knowledge and application of modern business administration in the areas of Tax, Accounting…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 24 | 14 contacts → | ||||
Partial evidence “We are a medium-sized auditing, accounting and consultancy firm.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 25 | 13 contacts → | ||||
Partial evidence “Solid Bilişim Teknolojileri is a technology company delivering end-to-end IT infrastructure, cybersecurity, and managed services solutions to organizations across various…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
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 audits and consulting services. 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 audits and consulting services.
- Partial evidence
- Its own public description names part of IT audits and consulting services, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name IT audits and consulting services. 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 310 IT audits and consulting services based in Türkiye
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IT audits and consulting services based in Türkiye at a glance
As of Sep 21, 2026Companies by employee count
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 310 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 audits and consulting services, 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 audits and consulting services”. 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 audits and consulting services), 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 audits and consulting services, 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, 404 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 21, 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 audits and consulting services by metro
- IT audits and consulting services in Istanbul108
- IT audits and consulting services in Ankara25
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 audits and consulting services, 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 audits and consulting services are there based in Türkiye?
RevenueBase identified 310 IT audits and consulting services 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?
Vi̇zyon, headquartered in Istanbul, tops this list with the largest team on record.
Which city has the most IT audits and consulting services?
Istanbul leads with 108 headquartered companies, followed by Ankara (25) and Atasehir (16).
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 404 verified decision-maker contacts tracked across these 310 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 21, 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.
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