Company lists · Data refreshed September 2026

Top 25 Refinery engineering firms worldwide

Name: Refinery engineering firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 26,728 companies tracked

RevenueBase identified 26,728 refinery engineering firms worldwide as of September 2026 and tracks 741,684 professional contacts across them, including 162,830 with verified work emails and 0 with mobile numbers. The United States is the largest market and Tehran the largest hub.

This list covers refinery engineering firms worldwide, 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 17, 2026. Country and city lists for refinery engineering firms follow the table.

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 17, 2026 86% judged on-target in blind review

26,728Companies

741,684Contacts tracked

162,830Verified emails

0Mobile numbers

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The 25 largest refinery engineering firms worldwide

Ranked by team size

Top 25 of 26,728 refinery engineering firms worldwide, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to refinery engineering 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	Worley	Indirect evidence	Sydney, AustraliaHQ checked Sep 17, 2026	10001+	34,763 contacts →
	Indirect evidence “Worley is a global professional services company of energy, chemicals and resources experts headquartered in Australia.” Source: RevenueBase Database · checked Sep 17, 2026
2	WOOD	Partial evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	10001+	26,949 contacts →
	Partial evidence “Wood is a global leader in consulting and engineering, delivering critical solutions across energy and materials markets.” Source: RevenueBase Database · checked Sep 17, 2026
3	Tecnicas Reunidas	Partial evidence	Madrid, SpainHQ checked Sep 17, 2026	10001+	10,588 contacts →
	Partial evidence “TR is an international general contractor engaged in the engineering and construction of industrial facilities in the fields of-Oil & Gas -Refining & Petrochemical -Power…” Source: RevenueBase Database · checked Sep 17, 2026
4	Tata Consulting Engineers	Partial evidence	Mumbai, IndiaHQ checked Sep 17, 2026	5,001-10,000	8,440 contacts →
	Partial evidence “Tata Consulting Engineers Limited (TCE) is the largest Indian private sector engineering and project consultancy and an emerging global leader in integrated engineering solutions.” Source: RevenueBase Database · checked Sep 17, 2026
5	Zachry Group	Partial evidence	San Antonio, TX, United StatesHQ checked Sep 17, 2026	10001+	6,824 contacts →
	Partial evidence “Zachry Group is North America's pacesetter in turnkey engineering, construction, maintenance, turnaround and fabrication services to the energy, chemicals, power, manufacturing…” Source: RevenueBase Database · checked Sep 17, 2026
6	Aesa A-Evangelista SA	Indirect evidence	Canning, IndiaHQ checked Sep 17, 2026	5,001-10,000	5,012 contacts →
	Indirect evidence “Since 1948 we specialize in projects for the energy industry.” Source: RevenueBase Database · checked Sep 17, 2026
7	CITGO	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	1,001-5,000	4,396 contacts →
	Indirect evidence “CITGO Petroleum Corporation is a recognized leader in the refining industry and operates under the well-known CITGO brand.” Source: RevenueBase Database · checked Sep 17, 2026
8	Bilfinger	Indirect evidence	Mannheim, GermanyHQ checked Sep 17, 2026	10001+	4,035 contacts →
	Indirect evidence “Bilfinger is an international industrial services provider with a vision to be the No.” Source: RevenueBase Database · checked Sep 17, 2026
9	S&b	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	5,001-10,000	3,510 contacts →
	Indirect evidence “S&B is an engineer and constructor that designs and builds some of the largest and most complex industrial facilities in the world.” Source: RevenueBase Database · checked Sep 17, 2026
10	ENPPI	Partial evidence	Nasr City 1, United StatesHQ checked Sep 17, 2026	1,001-5,000	3,370 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 17, 2026
11	National Engineering Services Pakistan PVT Limited Nespak	Indirect evidence	Lahore, PakistanHQ checked Sep 17, 2026	5,001-10,000	3,266 contacts →
	Indirect evidence “NESPAK is Pakistan’s premier consultancy organization (established in 1973).” Source: RevenueBase Database · checked Sep 17, 2026
12	UTC Engenharia	Indirect evidence	São Paulo, BrazilHQ checked Sep 17, 2026	10001+	3,176 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 17, 2026
13	Expertise	Indirect evidence	Al Jubail, Saudi ArabiaHQ checked Sep 17, 2026	10001+	3,033 contacts →
	Indirect evidence “Established in 2008 and headquartered in Al Jubail with operational offices across the kingdom, Expertise Company Ltd.” Source: RevenueBase Database · checked Sep 17, 2026
14	Entrust Solutions Group	Partial evidence	Lisle, IL, United StatesHQ checked Sep 17, 2026	1,001-5,000	2,966 contacts →
	Partial evidence “ENTRUST Solutions Group, an ENR Top 100 company, provides comprehensive and dependable engineering, consulting, and automation services to pipeline companies, gas and electric…” Source: RevenueBase Database · checked Sep 17, 2026
15	Toyo Engineering Corporation	Partial evidence	Chiba-shi Mihama-ku, JapanHQ checked Sep 17, 2026	1,001-5,000	2,760 contacts →
	Partial evidence “Toyo Engineering is an engineering company that constructs the plant in a global stage centering on the plant engineering field.” Source: RevenueBase Database · checked Sep 17, 2026
16	FTI	Partial evidence	Menasha, WI, United StatesHQ checked Sep 17, 2026	1,001-5,000	2,741 contacts →
	Partial evidence “Faith Technologies Incorporated (FTI) is a dynamic organization comprised of construction, engineering, manufacturing and renewable energy experts.” Source: RevenueBase Database · checked Sep 17, 2026
17	Priner	Indirect evidence	Rio De Janeiro, BrazilHQ checked Sep 17, 2026	5,001-10,000	2,737 contacts →
	Indirect evidence “Há mais de 40 anos, a Priner se destaca no setor de engenharia industrial e infraestrutura, oferecendo soluções com excelência técnica, seguras e eficientes.” Source: RevenueBase Database · checked Sep 17, 2026
18	دار الرياض DAR AL Riyadh	Partial evidence	Riyadh, Saudi ArabiaHQ checked Sep 17, 2026	1,001-5,000	2,720 contacts →
	Partial evidence “Founded in the mid-1970s by Prince Turki bin Abdullah bin Abdulrahman Al Saud, a forward-thinking engineering pioneer, Dar Al Riyadh has evolved into the Kingdom's leading…” Source: RevenueBase Database · checked Sep 17, 2026
19	Multiconsult	Indirect evidence	Oslo, NorwayHQ checked Sep 17, 2026	1,001-5,000	2,553 contacts →
	Indirect evidence “Multiconsult Norway is one of the leading firms of architectures, consulting engineers and designers in Norway.” Source: RevenueBase Database · checked Sep 17, 2026
20	CYD Ingeniería	Indirect evidence	Santiago, ChileHQ checked Sep 17, 2026	1,001-5,000	2,390 contacts →
	Indirect evidence “Nuestro propósito es contribuir al progreso sostenible de Latinoamérica y el mundo, mejorando la calidad de vida de las comunidades y dejando huella en las personas.” Source: RevenueBase Database · checked Sep 17, 2026
21	Nova Engevix	Indirect evidence	Barueri, BrazilHQ checked Sep 17, 2026	1,001-5,000	2,223 contacts →
	Indirect evidence “Fundada em 1965 e com mais de 40 anos de experiência, a Engevix é a maior empresa do segmento de engenharia consultiva do Brasil.” Source: RevenueBase Database · checked Sep 17, 2026
22	The Haskell Company	Partial evidence	Jacksonville, FL, United StatesHQ checked Sep 17, 2026	1,001-5,000	2,213 contacts →
	Partial evidence “Haskell delivers over $3 billion annually in Architecture, Engineering, Construction (AEC) and Consulting solutions to assure certainty of outcome for complex capital projects…” Source: RevenueBase Database · checked Sep 17, 2026
23	Mecon Limited, India	Partial evidence	Bengaluru, IndiaHQ checked Sep 17, 2026	1,001-5,000	2,157 contacts →
	Partial evidence “MECON Ltd.(MECON) was incorporated under the Companies Act, 1956 as Metallurgical and Engineering Consultants with the object of providing design and consultancy work for the Iron…” Source: RevenueBase Database · checked Sep 17, 2026
24	Montcalm Montagens Industriais	Indirect evidence	São Paulo, BrazilHQ checked Sep 17, 2026	1,001-5,000	2,088 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 17, 2026
25	IMEG	Partial evidence	Rock Island, IL, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,985 contacts →
	Partial evidence “Leaders in Engineering and Innovation.” Source: RevenueBase Database · checked Sep 17, 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: refinery engineering 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 refinery engineering firms.
Partial evidence: Its own public description names part of refinery engineering firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name refinery engineering 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 26,728 refinery engineering firms worldwide

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Refinery engineering firms worldwide at a glance

As of Sep 17, 2026

22.0%Verified-email coverage

27.7Average contacts per company

11-50Median size (employees)

1.7%Largest-city concentration · Tehran

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

11,872

11-50

9,046

51-200

3,712

201-500

1,129

501-1,000

450

1,001-5,000

326

5,001-10,000

10001+

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 refinery engineering 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.
Coverage: 68 countries, largest first: the United States, Brazil, India, Italy, France, the United Kingdom, Germany, Canada, Spain, Türkiye and 58 more. Country and city lists for refinery engineering firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “refinery engineering 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 refinery engineering 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 refinery engineering firms, and records with no verified work email.
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, 162,830 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 17, 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.

Refinery engineering firms by location

130 lists · largest first

Every Refinery engineering firms 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 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 refinery engineering 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 refinery engineering firms are there worldwide?

RevenueBase identified 26,728 refinery engineering firms worldwide 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?

Worley, headquartered in Sydney, tops this list with the largest team on record.

Which country has the most refinery engineering firms?

The United States leads with 3,365 companies, followed by Brazil (2,800) and India (1,848). Every refinery engineering firms list by country and city is linked on this page.

Which city has the most refinery engineering firms?

Tehran leads with 448 headquartered companies, followed by Sao Paulo (371) and Houston (339).

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 162,830 verified decision-maker contacts tracked across these 26,728 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 17, 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.