Company lists · Data refreshed September 2026

Top 20 IT audit consulting services based in Türkiye

RevenueBase identified 93 IT audit consulting services headquartered in Türkiye as of September 2026 and tracks 433 professional contacts across them, including 64 with verified work emails. Istanbul is the largest hub.

This list covers IT audit 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 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
93Companies
433Contacts tracked
64Verified emails
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The 20 largest IT audit consulting services based in Türkiye

Ranked by team size
Top 20 of 93 IT audit consulting services 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 audit consulting services: 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Partial evidenceİstanbul, TürkiyeHQ checked Sep 28, 202611-5042 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 28, 2026
2Indirect evidenceİstanbul, TürkiyeHQ checked Sep 28, 202611-5015 contacts →

Indirect evidence

“Optimum Denetim 2011 yılında kurulmuştur.”

Source: RevenueBase Database · checked Sep 28, 2026
3Indirect evidenceİstanbul, TürkiyeHQ checked Sep 28, 202611-5014 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 28, 2026
4Indirect evidenceBeşiktaş, TürkiyeHQ checked Sep 28, 202611-5012 contacts →

Indirect evidence

“Kaya & Bekler, üretim ve hizmet sektörleri başta olmak üzere, çeşitli kurumsal sektör işletmelerine bağımsız denetim, vergi danışmanlığı, tam tasdik, muhasebe ve hukuki…”

Source: RevenueBase Database · checked Sep 28, 2026
5Indirect evidenceIstanbul, TürkiyeHQ checked Sep 28, 202611-507 contacts →

Indirect evidence

Source: RevenueBase Database · checked Sep 28, 2026
6Indirect evidenceİstanbul, TürkiyeHQ checked Sep 28, 202651-2007 contacts →

Indirect evidence

“İDM İç Denetim Merkezi is a financial services company based out of Fahrettin Kerim Gökay ad:228 / 19, İstanbul, Istanbul, Turkey.”

Source: RevenueBase Database · checked Sep 28, 2026
7Indirect evidenceİstanbul (istanbul, TürkiyeHQ checked Sep 28, 202611-507 contacts →

Indirect evidence

“Siber güvenlik alanında Denetim, Danışmanlık ve Uygulama, Eğitim, Adli Bilişim konularında hizmet vermektedir.”

Source: RevenueBase Database · checked Sep 28, 2026
8Indirect evidenceBuyukcekmece, TürkiyeHQ checked Sep 28, 202611-506 contacts →

Indirect evidence

“Vergi Denetimi Denetim Finansal Danışmanlık Finansal Hizmetler”

Source: RevenueBase Database · checked Sep 28, 2026
9Indirect evidenceBahçelievler, TürkiyeHQ checked Sep 28, 202611-505 contacts →

Indirect evidence

“ÖKÇÜN YMM 1998 yılından beri profesyonel bir anlayış ile yeminli mali müşavirlik ve bağımsız denetim hizmeti veriyoruz.”

Source: RevenueBase Database · checked Sep 28, 2026
10Indirect evidenceSeyhan, TürkiyeHQ checked Sep 28, 20261-105 contacts →

Indirect evidence

“Vergi denetim ve danışmanlık hizmeti vermekteyim.”

Source: RevenueBase Database · checked Sep 28, 2026
11Indirect evidenceİstanbul, TürkiyeHQ checked Sep 28, 202611-504 contacts →

Indirect evidence

Source: RevenueBase Database · checked Sep 28, 2026
12Indirect evidenceIstanbul, TürkiyeHQ checked Sep 28, 20261-104 contacts →

Indirect evidence

“Deriner & Partners Müşterilerine denetim, danışmanlık ve outsourcing hizmetleri sunmaktadır.”

Source: RevenueBase Database · checked Sep 28, 2026
13Indirect evidenceSerdivan, TürkiyeHQ checked Sep 28, 20261-104 contacts →

Indirect evidence

“Finans, üretim ve iletişim alanlarında iç denetim ve yönetim danışmanlığı hizmetleri veren bir şirket”

Source: RevenueBase Database · checked Sep 28, 2026
14Indirect evidenceIstanbul, TürkiyeHQ checked Sep 28, 20261-103 contacts →

Indirect evidence

“G&G is an organization located in Turkey and Hungary, who is aiming to support the organizations and individuals to conduct their businesses on efficient and secure platforms.”

Source: RevenueBase Database · checked Sep 28, 2026
15Indirect evidenceIstanbul, TürkiyeHQ checked Sep 28, 20261-103 contacts →

Indirect evidence

“İşletmeniz İçin Yönetilebilir BT Danışmanlık Hizmetleri.”

Source: RevenueBase Database · checked Sep 28, 2026
16Indirect evidenceKartal, TürkiyeHQ checked Sep 28, 20261-103 contacts →

Indirect evidence

“Kurumsal organizasyonların bilgi güvenliği risklerini sistematik biçimde yönetmelerine destek oluyoruz.”

Source: RevenueBase Database · checked Sep 28, 2026
17Indirect evidenceİzmi̇r, TürkiyeHQ checked Sep 28, 20261-103 contacts →

Indirect evidence

“Managed internal controls related services (business process reviews, designs and re-engineering, controls review and implementation, risk assessments) for government institutions…”

Source: RevenueBase Database · checked Sep 28, 2026
18Indirect evidenceİstanbul, TürkiyeHQ checked Sep 28, 20261-102 contacts →

Indirect evidence

“Neta Denetim; İç Kontrol, Uyum ve Risk Yönetimi alanlarında müşterilerine bilgi ve birikimini aktaran bir danışmanlık firmasıdır.”

Source: RevenueBase Database · checked Sep 28, 2026
19Indirect evidenceŞişli, TürkiyeHQ checked Sep 28, 20261-101 contacts →

Indirect evidence

“Firmalarınızın mali açıdan güçlü bir şekilde büyümelerine yardımcı oluyoruz.”

Source: RevenueBase Database · checked Sep 28, 2026
20Indirect evidenceIstanbul, TürkiyeHQ checked Sep 28, 20261-101 contacts →

Indirect evidence

“HDE, İç Denetim / İç Kontrol, Süreç Danışmanlığı ve Bilişim Teknolojileri alanlarında çözüm ve hizmetler sunan, uzmanlık odaklı butik bir firmadır.”

Source: RevenueBase Database · checked Sep 28, 2026

Showing 20 of 93 IT audit consulting services based in Türkiye

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IT audit consulting services based in Türkiye at a glance

As of Sep 28, 2026
14.8%Verified-email coverage
4.7Average contacts per company
1-10Median size (employees)
39.8%Largest-city concentration · Istanbul
Sep 28, 2026Page data refreshed

Companies by employee count

1-10
52
11-50
36
51-200
5

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 93 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 audit 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 audit 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 audit 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 audit 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, 64 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.

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 audit 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 audit consulting services are there based in Türkiye?

RevenueBase identified 93 IT audit 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?

Lostar Bilgi Güvenliği, headquartered in Istanbul, tops this list with the largest team on record.

Which city has the most IT audit consulting services?

Istanbul leads with 37 headquartered companies, followed by Ankara (6) and Cankaya (6).

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 64 verified decision-maker contacts tracked across these 93 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.