Company lists · Data refreshed September 2026

Top 25 Downstream petroleum construction firms based in Türkiye

Name: Downstream petroleum construction firms based in Türkiye
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 453 companies tracked

RevenueBase identified 453 downstream petroleum construction firms headquartered in Türkiye as of September 2026 and tracks 8,707 professional contacts across them, including 1,057 with verified work emails. Istanbul is the largest hub.

This list covers downstream petroleum construction 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 16, 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 16, 2026 86% judged on-target in blind review

453Companies

8,707Contacts tracked

1,057Verified emails

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The 25 largest downstream petroleum construction firms based in Türkiye

Ranked by team size

Top 25 of 453 downstream petroleum construction firms based in Türkiye, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to downstream petroleum construction 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	Ronesans Endustri Tesisleri	Partial evidence	Istanbul, TürkiyeHQ checked Sep 16, 2026	10001+	1,157 contacts →
	Partial evidence “Rönesans Endüstri Tesisleri specializes in construction services and EPC in Hydrocarbons, Power, Metallurgy & Mining and Process Plants sectors.” Source: RevenueBase Database · checked Sep 16, 2026
2	Gama Holding	Indirect evidence	Ankara, TürkiyeHQ checked Sep 16, 2026	10001+	924 contacts →
	Indirect evidence “GAMA HOLDING A.Ş.” Source: RevenueBase Database · checked Sep 16, 2026
3	Teknokon Grup	Partial evidence	Istanbul, TürkiyeHQ checked Sep 16, 2026	1,001-5,000	459 contacts →
	Partial evidence “Headquartered in Istanbul / Turkey, Teknokon Group is a multi-disciplinary organization serving its clientele with a full range of engineering, procurement and construction for…” Source: RevenueBase Database · checked Sep 16, 2026
4	Havatek A.Ş	Partial evidence	Lütfen Seçiniz, TürkiyeHQ checked Sep 16, 2026	501-1,000	267 contacts →
	Partial evidence “HAVATEK is one of the leading fabrication and construction company in Turkiye specialized in Oil & Gas, Petrochemical and Energy Industries, performing projects in Turkiye and…” Source: RevenueBase Database · checked Sep 16, 2026
5	Birlesim Muhendisik	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 16, 2026	1,001-5,000	262 contacts →
	Indirect evidence “BİRLEŞİM MÜHENDİSLİK established in year 2002, in İSTANBUL and achieved its present structure with the vast acceleration parallel to the present technologies and sector…” Source: RevenueBase Database · checked Sep 16, 2026
6	Deha Tech Makina SAN VE TIC A.S	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 16, 2026	1,001-5,000	216 contacts →
	Indirect evidence “Welcome to DEHA TECH Engineering & Contracting Group We provide engineering and contracting services all around the world with our experienced team.” Source: RevenueBase Database · checked Sep 16, 2026
7	Berksan Engineering And Construction INC	Partial evidence	Uskudar, TürkiyeHQ checked Sep 16, 2026	501-1,000	178 contacts →
	Partial evidence “Berksan was established in 1998 to provide engineering and construction services for national and international projects.” Source: RevenueBase Database · checked Sep 16, 2026
8	Alkataş İnşaat VE Taahhüt A.Ş	Partial evidence	İstanbul, TürkiyeHQ checked Sep 16, 2026	501-1,000	177 contacts →
	Partial evidence “Alkataş İnşaat is a construction company based out of Ertürk sokak no:1 k1 plaza kavacık, Beykoz/İstanbul, Turkey.” Source: RevenueBase Database · checked Sep 16, 2026
9	Exacons	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 16, 2026	201-500	155 contacts →
	Indirect evidence “EXACONS Project and Contracting Inc; was founded in 2014, Istanbul based on the vision to become a Solution Partner in every phase of the industrial facility life cycle for local…” Source: RevenueBase Database · checked Sep 16, 2026
10	Tekmont	Indirect evidence	Kocaeli̇, TürkiyeHQ checked Sep 16, 2026	501-1,000	130 contacts →
	Indirect evidence “Teknik Montaj Endüstri Tesisleri İmalat ve Montaj San.” Source: RevenueBase Database · checked Sep 16, 2026
11	Vito Energy, Engineering & Construction	Partial evidence	İstanbul, TürkiyeHQ checked Sep 16, 2026	501-1,000	120 contacts →
	Partial evidence “ViTO Energy Engineering and Construction is an integrated EPC services provider for industrial projects.” Source: RevenueBase Database · checked Sep 16, 2026
12	Enka İnşaat VE Sanayi A.Ş. Engineering For A Better Future	Partial evidence	Besiktas, TürkiyeHQ checked Sep 16, 2026	10001+	107 contacts →
	Partial evidence “ENKA is a global engineering and construction firm headquartered in Istanbul, Turkey.” Source: RevenueBase Database · checked Sep 16, 2026
13	Tefirom İnşaat Enerji Sanayi VE Ticaret A.Ş	Partial evidence	Ankara, TürkiyeHQ checked Sep 16, 2026	1,001-5,000	102 contacts →
	Partial evidence “Tefirom is a global construction and energy company headquartered in Ankara, Türkiye, specializing in large-scale projects across construction, engineering and energy sectors.” Source: RevenueBase Database · checked Sep 16, 2026
14	Prizma Endüstri	Indirect evidence	Ankara, TürkiyeHQ checked Sep 16, 2026	201-500	82 contacts →
	Indirect evidence “PRIZMA started operations in Ankara-Turkey in 2001.” Source: RevenueBase Database · checked Sep 16, 2026
15	Stadia Engineering	Indirect evidence	Çankaya, TürkiyeHQ checked Sep 16, 2026	51-200	77 contacts →
	Indirect evidence “Stadia Engineering and Consultancy was established in 2018.” Source: RevenueBase Database · checked Sep 16, 2026
16	Teknika Teknik	Indirect evidence	Atasehir, TürkiyeHQ checked Sep 16, 2026	501-1,000	73 contacts →
	Indirect evidence “Teknika Teknik Taahhüt A.Ş.” Source: RevenueBase Database · checked Sep 16, 2026
17	Joule Energy	Indirect evidence	Atasehir, TürkiyeHQ checked Sep 16, 2026	51-200	67 contacts →
	Indirect evidence “The Joule Energy's main activities are the installation, maintenance, engineering services and spare parts supply of Power Plants, Rafineries & Industries Plants."Joule Energy"…” Source: RevenueBase Database · checked Sep 16, 2026
18	D&t Group Engineering And Contracting CO	Indirect evidence	Umraniye, TürkiyeHQ checked Sep 16, 2026	501-1,000	62 contacts →
	Indirect evidence “We are delighted to introduce D&T Group as an engineering and contracting company.” Source: RevenueBase Database · checked Sep 16, 2026
19	Clean Tank Engineering	Indirect evidence	Aliaga, TürkiyeHQ checked Sep 16, 2026	201-500	60 contacts →
	Indirect evidence “CleanTank Mühendislik - Mühendislik Hizmeti - Kumlama ve Boyama Hizmeti - API 650 Tank İmalatları - API 653 Tank Bakım Onarım Hizmeti CleanTank Mekanik - Endüstriyel Borulama…” Source: RevenueBase Database · checked Sep 16, 2026
20	MOD Endüstriyel Servisler	Indirect evidence	İstanbul, TürkiyeHQ checked Sep 16, 2026	201-500	58 contacts →
	Indirect evidence “Mod Endüstriyel Servisler, 2013 yılından bu yana enerji, petrokimya, rafineri, çimento, madencilik, tersane ve endüstriyel üretim tesislerine entegre servis çözümleri sunmaktadır.” Source: RevenueBase Database · checked Sep 16, 2026
21	Efor Industrial Plants Erection, Manufacturing & Construction INC	Indirect evidence	Ankara, TürkiyeHQ checked Sep 16, 2026	501-1,000	56 contacts →
	Indirect evidence “EFOR Ltd was established in 1998 in Ankara, Turkey as a foreign trade company specializing on materials and equipment utilized in power plants.” Source: RevenueBase Database · checked Sep 16, 2026
22	Koryon Engineering & Consultancy	Indirect evidence	Bornova, TürkiyeHQ checked Sep 16, 2026	11-50	55 contacts →
	Indirect evidence “At A Glance;* Oil & Gas Engineering Company,* Managed by Practicing Refinery Engineers,* Engineering Expertise that Minimizes Cost & Improves Process,* Over 100 Total Project…” Source: RevenueBase Database · checked Sep 16, 2026
23	Aksoylar Mühendislik A.Ş	Indirect evidence	İstanbul, TürkiyeHQ checked Sep 16, 2026	51-200	52 contacts →
	Indirect evidence “Aksoylar Mühendislik, endüstriyel tesisler için komple kuruluma dayalı bir taahhüt firmasıdır.” Source: RevenueBase Database · checked Sep 16, 2026
24	Hesatekni̇k	Indirect evidence	İzmir, TürkiyeHQ checked Sep 16, 2026	11-50	43 contacts →
	Indirect evidence “HESATEKNİK dönemin gelişmiş ve verimli teknoloji altyapılarını kullanarak, geleceğin endüstriyel ve enerji üretim tesislerini müşterilerine anahtar teslimi sunmayı, kesintisiz…” Source: RevenueBase Database · checked Sep 16, 2026
25	Rapid Engineering And Maintenance Solutions - Rems	Partial evidence	Izmir, TürkiyeHQ checked Sep 16, 2026	51-200	35 contacts →
	Partial evidence “Rapid Engineering and Maintenance Solutions - REMS company is set in Turkey with the aim to provide engineering and maintenance solutions as well as construction services to the…” Source: RevenueBase Database · checked Sep 16, 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: downstream petroleum construction 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 downstream petroleum construction firms.
Partial evidence: Its own public description names part of downstream petroleum construction firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name downstream petroleum construction 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 453 downstream petroleum construction firms based in Türkiye

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Downstream petroleum construction firms based in Türkiye at a glance

As of Sep 16, 2026

12.1%Verified-email coverage

19.2Average contacts per company

11-50Median size (employees)

16.6%Largest-city concentration · Istanbul

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

134

11-50

148

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

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 453 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 downstream petroleum construction 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 “downstream petroleum construction 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 downstream petroleum construction 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 downstream petroleum construction 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, 1,057 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 16, 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.

Downstream petroleum construction firms by metro

Downstream petroleum construction firms in Istanbul75
Downstream petroleum construction firms in Ankara47

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 downstream petroleum construction 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 downstream petroleum construction firms are there based in Türkiye?

RevenueBase identified 453 downstream petroleum construction 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?

Ronesans Endustri Tesisleri, headquartered in Istanbul, tops this list with the largest team on record.

Which city has the most downstream petroleum construction firms?

Istanbul leads with 75 headquartered companies, followed by Ankara (47) and Izmir (24).

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 1,057 verified decision-maker contacts tracked across these 453 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 16, 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.