Company lists · Data refreshed October 2026

Top 25 Downstream oil and gas contractors worldwide

Name: Downstream oil and gas contractors worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 11, 2026 8,197 companies tracked

RevenueBase identified 8,197 company matches for downstream oil and gas contractors worldwide as of October 2026 and tracks 505,034 professional contacts across them, including 70,730 with verified work emails. The United States is the largest market and Tehran the largest hub.

This list covers company matches for downstream oil and gas contractors worldwide, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed October 11, 2026. Country and city lists for downstream oil and gas contractors follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Oct 11, 2026 How this list was built

8,197Companies

505,034Contacts tracked

70,730Verified emails

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The 25 largest downstream oil and gas contractors worldwide

Ranked by team size

Top 25 of 8,197 company matches for downstream oil and gas contractors worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 11, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Mcdermott International, LTD	Exact match	Houston, TX, United StatesHQ recorded Oct 11, 2026	10001+	21,087 contacts →
	Exact match “McDermott is a premier provider of engineering and construction solutions to the energy industry.” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
2	Aker Solutions	Exact match	Fornebu, NorwayHQ recorded Oct 11, 2026	10001+	16,152 contacts →
	Exact match “Aker Solutions is a global engineering and technology company known for delivering complex energy projects with trusted quality and predictable results.” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
3	Petrofac	Exact match	London, United KingdomHQ recorded Oct 11, 2026	5,001-10,000	11,863 contacts →
	Exact match “We are a leading international service provider to the energy industry, with a diverse client portfolio including many of the world’s leading energy companies.” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
4	Tecnicas Reunidas	Exact match	Madrid, SpainHQ recorded Oct 11, 2026	10001+	11,378 contacts →
	Exact match “TR is an international general contractor engaged in the engineering and construction of industrial facilities in the fields of-Oil & Gas -Refining & Petrochemical -Power…” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
5	Samsung E&a	Exact match	Gangdong-gu, South KoreaHQ recorded Oct 11, 2026	5,001-10,000	7,325 contacts →
	Exact match “SAMSUNG E&A is one of the world’s leading engineering, procurement, construction and project management (EPC & PM) companies.” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
6	Zachry Group	Exact match	San Antonio, TX, United StatesHQ recorded Oct 11, 2026	10001+	7,053 contacts →
	Exact match “Zachry Group is North America's pacesetter in turnkey engineering, construction, maintenance, turnaround and fabrication services to the energy, chemicals, power, manufacturing…” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
7	Monadelphous	Exact match	Perth, AustraliaHQ recorded Oct 11, 2026	5,001-10,000	5,398 contacts →
	Exact match “Monadelphous is a leading Australian ASX-200 engineering group providing construction, maintenance and industrial services to the resources, energy and infrastructure sectors.” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
8	Aesa A-Evangelista SA	Exact match	Canning, IndiaHQ recorded Oct 11, 2026	5,001-10,000	5,219 contacts →
	Exact match “Since 1948 we specialize in projects for the energy industry.” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
9	Bilfinger	Exact match	Mannheim, GermanyHQ recorded Oct 11, 2026	10001+	4,268 contacts →
	Exact match “Bilfinger is an international industrial services provider with a vision to be the No.” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
10	CBSI	Exact match	Volta Redonda, BrazilHQ recorded Oct 11, 2026	10001+	3,994 contacts →
	Exact match “Somos a CBSI!” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
11	UTC Engenharia	Exact match	São Paulo, BrazilHQ recorded Oct 11, 2026	10001+	3,755 contacts →
	Exact match “The Company operates in sundry markets, taking the lead in such sectors as oil & gas production and processing, petrochemicals, power generation, steel production, paper & pulp…” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
12	S&b	Exact match	Houston, TX, United StatesHQ recorded Oct 11, 2026	5,001-10,000	3,615 contacts →
	Exact match “S&B is an engineer and constructor that designs and builds some of the largest and most complex industrial facilities in the world.” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
13	Ortec Group	Exact match	Aix-en-provence, FranceHQ recorded Oct 11, 2026	10001+	3,504 contacts →
	Exact match “En conjuguant depuis sa création audace et rigueur, le groupe Ortec est devenu aujourd’hui un des leaders des services à l’industrie, l’énergie et l’environnement.” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
14	ENPPI	Exact match	Nasr City 1, United StatesHQ recorded Oct 11, 2026	1,001-5,000	3,451 contacts →
	Exact match “Enppi is globally recognized as a major engineering, EPC main contractor, and management contractor, with decades of experience in onshore and offshore projects in the oil and…” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
15	Expertise	Exact match	Al Jubail, Saudi ArabiaHQ recorded Oct 11, 2026	10001+	2,939 contacts →
	Exact match “Established in 2008 and headquartered in Al Jubail with operational offices across the kingdom, Expertise Company Ltd.” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
16	Estrutural	Exact match	Porto Alegre, BrazilHQ recorded Oct 11, 2026	1,001-5,000	2,795 contacts →
	Exact match “Quem somos: Somos uma empresa nacional, com mais de 30 anos no segmento da construção, montagem e manutenção industrial.” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
17	Qatar Engineering & Construction Company W.L.L	Exact match	Ras Laffan Industrial City (rlic), QatarHQ recorded Oct 11, 2026	5,001-10,000	2,397 contacts →
	Exact match “Qatar Engineering & Construction Company (Qcon) is the leading National EPC & Maintenance Contractor in the Oil & Gas, Petrochemical, Fertilizer and Power industries.” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
18	Montcalm Montagens Industriais	Exact match	São Paulo, BrazilHQ recorded Oct 11, 2026	1,001-5,000	2,354 contacts →
	Exact match “Fundada em 1971, a Montcalm tem como missão, oferecer soluções de engenharia construtiva para implantação, ampliação e manutenção de indústrias de processos, sempre com o…” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
19	OCYAN	Exact match	Rio De Janeiro, BrazilHQ recorded Oct 11, 2026	1,001-5,000	2,328 contacts →
	Exact match “A OCYAN atua há décadas na prestação de serviços para o setor de óleo e gás upstream, estruturando suas operações em três frentes de atuação.” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
20	CTCI	Exact match	Taipei City, TaiwanHQ recorded Oct 11, 2026	5,001-10,000	2,161 contacts →
	Exact match “CTCI (TWSE: 9933, TPEx: 5209, TPEx: 6803) is a global engineering, procurement, and construction (EPC) services provider.” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
21	Special Technical Services L.L.C., Oman STS	Exact match	Muscat, OmanHQ recorded Oct 11, 2026	10001+	2,113 contacts →
	Exact match “STS Group, headquartered in The Sultanate of Oman, is a leading multidisciplinary contracting group specializing in Construction, Fabrication and Maintenance services for the…” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
22	ELFE	Exact match	Macaé, BrazilHQ recorded Oct 11, 2026	1,001-5,000	2,006 contacts →
	Exact match “No mercado há mais de duas décadas, a Axia é uma empresa nacional com atuação em operação e manutenção industrial.” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
23	NAES	Exact match	Issaquah, WA, United StatesHQ recorded Oct 11, 2026	1,001-5,000	1,999 contacts →
	Exact match “NAES is the power generation industry’s largest independent services provider, with more than 40 years of experience managing risk and turning it into profits.” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
24	Brown & Root Industrial Services, LLC	Exact match	Baton Rouge, LA, United StatesHQ recorded Oct 11, 2026	5,001-10,000	1,969 contacts →
	Exact match “Brown & Root Industrial Services offers the full range of industrial services – engineering, construction, maintenance, turnaround, and specialty (painting, scaffolding…” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase
25	Rotary Engineering	Exact match	SingaporeHQ recorded Oct 11, 2026	5,001-10,000	1,964 contacts →
	Exact match “Founded 1972 in Singapore, Rotary Engineering is your Strategic Energy Partner providing Integrated Infrastructure Solutions with a sustainability focus.” Recorded in the RevenueBase company graph · Oct 11, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “downstream oil and gas contractors”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 8,197 downstream oil and gas contractors worldwide

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Downstream oil and gas contractors worldwide at a glance

As of Oct 11, 2026

14.0%Verified-email coverage

61.6Average contacts per company

11-50Median size (employees)

2.9%Largest-city concentration · Tehran

Oct 11, 2026Page data refreshed

Companies by employee count

1-10

1,678

11-50

2,803

51-200

1,997

201-500

846

501-1,000

380

1,001-5,000

358

5,001-10,000

10001+

Email recency is reported on each country list linked below.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
Coverage: Every country. Country and city lists for downstream oil and gas contractors are linked below.
What qualifies: Company records worldwide whose business descriptions match “downstream oil and gas contractors” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 70,730 professional contacts with verified work emails across the full matched dataset. 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 October 11, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Downstream oil and gas contractors by location

57 lists · largest first

Every Downstream oil and gas contractors list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “downstream oil and gas contractors”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many downstream oil and gas contractors are there worldwide?

RevenueBase identified 8,197 company matches for downstream oil and gas contractors worldwide as of October 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Mcdermott International, LTD tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which country has the most downstream oil and gas contractors?

The United States leads with 1,144 companies, followed by India (479) and Nigeria (471). Every downstream oil and gas contractors list by country and city is linked on this page.

Which city has the most downstream oil and gas contractors?

Tehran leads with 235 company records, followed by Houston (180) and Abu Dhabi (136).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 70,730 professional contacts with verified work emails tracked across these 8,197 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 11, 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 SmartSearch, 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.