Company lists · Data refreshed September 2026
Top 25 Professional service companies based in Türkiye
RevenueBase identified 229 professional service companies headquartered in Türkiye as of September 2026 and tracks 2,692 professional contacts across them, including 266 with verified work emails. Istanbul is the largest hub.
This list covers professional service companies 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 20, 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 professional service companies based in Türkiye
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 384 contacts → | ||||
Indirect evidence “Sistem Group has been founded in 1996 and has more than 170 employees in the group offices in Ankara, İstanbul, Adana, Bursa, Gaziantep and İzmir.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 45 contacts → | ||||
Indirect evidence “Rödl & Partner Nürnberg merkezli Hukuk, Vergi Danışmanlığı, Mali Müşavirlik, Yönetim/IT Danışmanlığı ve Denetim alanlarında 50 ülkede 107 farklı lokasyonda yaklaşık 5260 çalışanı…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 39 contacts → | ||||
Indirect evidence “PKF Turkey was established in 2005 in Istanbul.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 32 contacts → | ||||
Indirect evidence “Doing the right thing, at the right time." Welcome to the leading Consulting company on the market!” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 32 contacts → | ||||
Indirect evidence “İtimat Global kurumsal hizmet ağının nüvesini oluşturan İtimat Bağımsız Denetim A.Ş.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 25 contacts → | ||||
Indirect evidence “Granit 1991 yılında Yönetim Danışmanlığı alanında faaliyetlerine başlayan şirketimiz, 1998 yılından itibaren 3568 sayılı yasa kapsamında tescil edilen GRANİT SERBEST MUHASEBECİ…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 21 contacts → | ||||
Indirect evidence “ANDSPİCA olarak hedefimiz herkesle değil, sürekli ve güvenilir bir çözüm ortağı arayan şirketlerle çalışmak ve geleceği birlikte şekillendirmek temeline dayalıdır.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 8 | 17 contacts → | ||||
Indirect evidence “Türkiye'de 2003 yılında başlattığımız faaliyetlerimize, bugün İstanbul'da bulunan merkez ofisimizde, konusunda deneyimli ve uzmanlaşmış kadromuzla, sektör odaklı ve müşterilerine…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 15 contacts → | ||||
Indirect evidence “Optimum Denetim 2011 yılında kurulmuştur.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 14 contacts → | ||||
Indirect evidence “Consulta Grubu, hizmet alanlarına göre kurumsal yapılanmasını oluşturmuş beş şirketten oluşmaktadır.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 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 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 14 contacts → | ||||
Indirect evidence “Andersen in Turkey: Trusted Tax, Audit & Advisory for Confident Growth Andersen in Turkey helps Turkish and international businesses navigate tax, audit, accounting, and advisory…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 14 contacts → | ||||
Indirect evidence “GT İnovasyon, bilgi sistemleri danışmanlığından vergi danışmanlığına uzanan geniş bir yelpazede verdiği danışmanlık faaliyetleriyle finansal hizmetler, üretim, enerji, teknoloji…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 13 contacts → | ||||
Indirect evidence “İZDENETİM deneyimli ve profesyonel bir ekip tarafından kurulmuş olup; • Yeminli mali müşavirlik, • Bağımsız denetim, • Denetim hizmetleri, • Yönetim danışmanlığı, • Mali…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 13 contacts → | ||||
Indirect evidence “Our experienced team, with a universal approach and success proven solutions, provides simplify complexity, value-creating solutions to our customers and partners.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 13 contacts → | ||||
Indirect evidence “REHBER, Bağımsız Denetim, Finansal Danışmanlık, Yeminli Mali Müşavirlik, Ulusal ve Uluslararası Fon Denetimi, Vergi ve Hukuk Müşavirliği ve Bilgi Sistemleri Denetimi konularında…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 11 contacts → | ||||
Indirect evidence “TCS Lydia (A member of TCS Global) provides tax services (Tax management and accounting, transfer pricing, legal services), audit & assurance services (Independent auditing, IFRS…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 9 contacts → | ||||
Indirect evidence “1996 yılında İzmir’de kurulan SİMGEÇÖZÜMEVİ, bugün 500' ü aşkın müşterisi ve 15' e yakın iş ortağı ile alanında uzmanlaşmış personeli ve kurumsal organizasyon yapısı ile hizmet…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 9 contacts → | ||||
Indirect evidence “Kapsam YMM,1995 yılından bu yana tecrübeli uzman kadrosuyla Mali Müşavirlik, İç Denetim, Vergi Denetim, Planlama, Danışmanlığı hizmetleri vermektedir.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 9 contacts → | ||||
Indirect evidence “KRK Partners olarak esas amacımız, toplumda güven oluşturarak, paydaşlarımızın önemli sorunlarına çözüm üreterek, sürdürülebilir işletme olmalarını sağlamaktır.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 8 contacts → | ||||
Indirect evidence “Mali danışman seçimine vereceğiniz önem; en az yeni yatırım alanları için vereceğiniz kararlar kadar önemlidir.” Ülkemizin sürekli içinde olduğu ekonomik, politik ve sosyal…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 7 contacts → | ||||
Indirect evidence “ABC DENETİM, 2002 Yılında faaliyetine başlamıştır.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 7 contacts → | ||||
Indirect evidence “Tenet, yerel ve uluslararası tüm müşterilerinin ihtiyaçlarına cevap vermek adına denetim ve danışmanlık anlayışını genişleterek, firmaya ve endüstriye özel hizmetler sağlayan…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 7 contacts → | ||||
Indirect evidence “Ofisimiz farklı ve kaliteli hizmet sunarak, müşteri memnuniyetini en yüksek düzeyde tutma anlayışıyla hareket eder.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 7 contacts → | ||||
Indirect evidence “In order to enable our clients to benefit from the experience of our team in the most efficient way, we set up teams that focus on the specific field of business.” Source: RevenueBase Database · checked Sep 20, 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: professional service companies. 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 professional service companies.
- Partial evidence
- Its own public description names part of professional service companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name professional service companies. 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 229 professional service companies based in Türkiye
See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 266 reachable decision-makers.
Free signup · no credit card
Professional service companies based in Türkiye at a glance
As of Sep 20, 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 229 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 professional service companies, 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 “professional service companies”. 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 professional service companies), 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 professional service companies, 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, 266 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 20, 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.
Professional service companies by metro
- Professional service companies in Istanbul78
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 professional service companies, 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 professional service companies are there based in Türkiye?
RevenueBase identified 229 professional service companies 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?
Sistem Global Danışmanlık A.Ş, headquartered in Istanbul, tops this list with the largest team on record.
Which city has the most professional service companies?
Istanbul leads with 78 headquartered companies, followed by Ankara (14) and Cankaya (10).
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 266 verified decision-maker contacts tracked across these 229 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 20, 2026.
Ready to reach these companies? Verified emails and direct dials for all 229 professional service companies based in Türkiye. Start with a free account, no credit card.
Download this list →Related lists
Professional service companies by geography
- Professional service companies based in Buenos Aires, Argentina
- Professional service companies based in Belo Horizonte, Brazil
- Professional service companies based in Campinas, Brazil
- Professional service companies based in Curitiba, Brazil
- Professional service companies based in Fortaleza, Brazil
- Professional service companies based in Porto Alegre, Brazil
- Professional service companies based in Recife, Brazil
- Professional service companies based in Rio De Janeiro, Brazil
- Professional service companies based in Salvador, Brazil
- Professional service companies based in Sao Paulo, Brazil
- Professional service companies based in Calgary, Canada
- Professional service companies based in Toronto, Canada
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.
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Professional service companies based in Buenos Aires, Argentina
- Professional service companies based in Belo Horizonte, Brazil
- Professional service companies based in Campinas, Brazil
- Professional service companies based in Curitiba, Brazil
- Professional service companies based in Fortaleza, Brazil
- Professional service companies based in Porto Alegre, Brazil