Company lists · Data refreshed September 2026

Top 25 Oil refinery construction companies based in Spain

Name: Oil refinery construction companies based in Spain
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 15, 2026 130 companies tracked

RevenueBase identified 130 oil refinery construction companies headquartered in Spain as of September 2026 and tracks 16,697 professional contacts across them, including 2,944 with verified work emails. Madrid is the largest hub.

This list covers oil refinery construction companies headquartered in Spain, 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 15, 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 15, 2026 86% judged on-target in blind review

130Companies

16,697Contacts tracked

2,944Verified emails

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The 25 largest oil refinery construction companies based in Spain

Ranked by team size

Top 25 of 130 oil refinery construction companies based in Spain, ranked by team size, largest first. Data refreshed Sep 15, 2026. RevenueBase Smart Search rates how each company's information relates to oil refinery construction companies: 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	Tecnicas Reunidas	Strong evidence	Madrid, SpainHQ checked Sep 15, 2026	10001+	10,588 contacts →
	Strong 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 15, 2026
2	Dragados Offshore	Indirect evidence	11510 Puerto Real, SpainHQ checked Sep 15, 2026	1,001-5,000	1,348 contacts →
	Indirect evidence “Founded in 1972, Dragados Offshore S.A.” Source: RevenueBase Database · checked Sep 15, 2026
3	Nervion Industries, Engineering & Services, S.L	Indirect evidence	Bilbao, SpainHQ checked Sep 15, 2026	1,001-5,000	681 contacts →
	Indirect evidence “NERVION INDUSTRIES is a business group dedicated to industrial services and applied engineering, providing services in strategic sectors.” Source: RevenueBase Database · checked Sep 15, 2026
4	Tamoin	Indirect evidence	Erandio/ Altzaga, SpainHQ checked Sep 15, 2026	1,001-5,000	630 contacts →
	Indirect evidence “TAMOIN, fundada en 1956, es en la actualidad una sociedad empresarial de GTM Grupo, en constante evolución hacia la especialización en servicios industriales.” Source: RevenueBase Database · checked Sep 15, 2026
5	Intecsa Industrial	Indirect evidence	Madrid, SpainHQ checked Sep 15, 2026	501-1,000	372 contacts →
	Indirect evidence “Intecsa Industrial is a Spanish engineering company with more than 50 years experience in Engineering, “Turn-key” execution of industrial plants and supply of technological…” Source: RevenueBase Database · checked Sep 15, 2026
6	Df-Duro Felguera	Indirect evidence	Gijón, SpainHQ checked Sep 15, 2026	1,001-5,000	301 contacts →
	Indirect evidence “Duro Felguera is a global company based in Asturias.” Source: RevenueBase Database · checked Sep 15, 2026
7	Técnicas Reunidas Initec	Indirect evidence	Madrid, SpainHQ checked Sep 15, 2026	501-1,000	276 contacts →
	Indirect evidence “Contratista general con actividad internacional que se dedica a la ingeniería, diseño y construcción de todo tipo de instalaciones industriales para un amplio espectro de clientes…” Source: RevenueBase Database · checked Sep 15, 2026
8	Lointek	Indirect evidence	Urduliz, SpainHQ checked Sep 15, 2026	201-500	140 contacts →
	Indirect evidence “LOINTEK is a private company firmly established in the international market of engineering, supply, manufacture and service in the sector of equipment for the industry of the…” Source: RevenueBase Database · checked Sep 15, 2026
9	Techno PRO Hispania	Indirect evidence	Cartagena, SpainHQ checked Sep 15, 2026	201-500	128 contacts →
	Indirect evidence “Since 1990, Techno Pro Hispania (TPH) and the FIVA Group have worked closely with their clients in the development of industrial, naval, energy, and petrochemical engineering…” Source: RevenueBase Database · checked Sep 15, 2026
10	Novargi	Indirect evidence	Vitoria-gasteiz, SpainHQ checked Sep 15, 2026	51-200	123 contacts →
	Indirect evidence “NOVARGI GROUP, is a global integral engineering solutions contractor for the Energy and Fertilizer Industry.” Source: RevenueBase Database · checked Sep 15, 2026
11	Eia21	Indirect evidence	Erandio, SpainHQ checked Sep 15, 2026	51-200	113 contacts →
	Indirect evidence “Founded in 1979, EIA21 was chartered with the aim of responding to the engineering needs of high growth industrial companies, soon achieved a strong footprint in this area…” Source: RevenueBase Database · checked Sep 15, 2026
12	Azcatec Tecnología E Ingeniería	Indirect evidence	Sevilla, SpainHQ checked Sep 15, 2026	51-200	98 contacts →
	Indirect evidence “AZCATEC It is the tool for a group of well-organized professional engineers and experts in the development of industrial plants, energy and environmental engineering have to…” Source: RevenueBase Database · checked Sep 15, 2026
13	Diseprosa	Indirect evidence	Madrid, SpainHQ checked Sep 15, 2026	51-200	92 contacts →
	Indirect evidence “DISEÑOS Y PROYECTOS REUNIDOS, S.A.(DISEPROSA), fundada en Madrid en 1986 y dedicada al desarrollo y prestación de servicios de Ingeniería y Consultoría, Dirección y Supervisión de…” Source: RevenueBase Database · checked Sep 15, 2026
14	Dynatec, S.A	Indirect evidence	Madrid, SpainHQ checked Sep 15, 2026	201-500	88 contacts →
	Indirect evidence “Engineering company based in Madrid, Spain with over 40 years of experience in the fields of petrochemical and industrial engineering, conventional and nuclear power plants…” Source: RevenueBase Database · checked Sep 15, 2026
15	Ledr Ingenieria Y Servicios SL	Indirect evidence	Abrera, SpainHQ checked Sep 15, 2026	51-200	63 contacts →
	Indirect evidence “En LEDR Ingeniería y Servicios SL no solo diseñamos sobre el plano, nuestra verdadera fuerza reside en la capacidad de ejecutar proyectos desde el concepto inicial hasta la puesta…” Source: RevenueBase Database · checked Sep 15, 2026
16	Ineltron Solutions	Indirect evidence	Betanzos, SpainHQ checked Sep 15, 2026	201-500	58 contacts →
	Indirect evidence “INELTRON es una empresa multinacional especializada en la prestación de servicios de ingeniería, construcción, puesta en marcha, operación y mantenimiento en sistemas de…” Source: RevenueBase Database · checked Sep 15, 2026
17	Design And Projects International, C.A. Dapin	Strong evidence	San Sebastián De Los Reyes, SpainHQ checked Sep 15, 2026	201-500	58 contacts →
	Strong evidence “Design and Projects International, C.A.(DAPIN, C.A.), is a thriving engineering and construction company in the Oil & Gas / Energy industry positioned in natural gas, refining…” Source: RevenueBase Database · checked Sep 15, 2026
18	Aguilar Y Salas S.A	Indirect evidence	Barcelona, SpainHQ checked Sep 15, 2026	51-200	49 contacts →
	Indirect evidence “ENG Aguilar y Salas, s.a.” Source: RevenueBase Database · checked Sep 15, 2026
19	Iberastur Ingeniería	Indirect evidence	Avilés, SpainHQ checked Sep 15, 2026	51-200	48 contacts →
	Indirect evidence “Iberastur es una empresa especializada en ingeniería industrial, reconocida por ofrecer soluciones técnicas avanzadas para optimizar la eficiencia y el rendimiento de…” Source: RevenueBase Database · checked Sep 15, 2026
20	Centunion, S.A	Partial evidence	Madrid, SpainHQ checked Sep 15, 2026	51-200	41 contacts →
	Partial evidence “CENTUNION is an engineering and construction company dedicated to the development of infrastructure projects.” Source: RevenueBase Database · checked Sep 15, 2026
21	Gesinom	Indirect evidence	Puertollano, SpainHQ checked Sep 15, 2026	51-200	38 contacts →
	Indirect evidence “GESINOM Ingeniería es una empresa especializada en ofrecer soluciones de ingeniería industrial con más de 18 años de experiencia en el sector.” Source: RevenueBase Database · checked Sep 15, 2026
22	CMN Ingeniería	Partial evidence	Santa Cruz De Tenerife, SpainHQ checked Sep 15, 2026	11-50	30 contacts →
	Partial evidence “We are a company of advanced technical services for Engineering, Construction and Installations.” Source: RevenueBase Database · checked Sep 15, 2026
23	Esqueiro	Indirect evidence	A Coruña, SpainHQ checked Sep 15, 2026	51-200	28 contacts →
	Indirect evidence “ESQUEIRO, S.L.” Source: RevenueBase Database · checked Sep 15, 2026
24	OSL Iberia	Indirect evidence	Cartagena, SpainHQ checked Sep 15, 2026	51-200	27 contacts →
	Indirect evidence “OSL Iberia es una Ingeniería multidisciplinar con presencia internacional, formado por un equipo de profesionales creativos, que desarrolla e implementa soluciones de calidad y…” Source: RevenueBase Database · checked Sep 15, 2026
25	DYD Diseño Y Construcción Industrial S.L	Indirect evidence	Tres Cantos, SpainHQ checked Sep 15, 2026	51-200	27 contacts →
	Indirect evidence “DyD Diseño y Construcción Industrial S.L, es una empresa de ingeniería y construcción especializada en el desarrollo completo de proyectos de instalaciones industriales y obra…” Source: RevenueBase Database · checked Sep 15, 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: oil refinery construction 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 oil refinery construction companies.
Partial evidence: Its own public description names part of oil refinery construction companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name oil refinery construction 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 130 oil refinery construction companies based in Spain

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Oil refinery construction companies based in Spain at a glance

As of Sep 15, 2026

17.6%Verified-email coverage

128.4Average contacts per company

11-50Median size (employees)

18.5%Largest-city concentration · Madrid

Sep 15, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured worldwide rather than for Spain, so it is reported there. Company counts and contact totals on this page are exact for Spain, over 130 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 oil refinery construction 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 Spain whose own description of what they do matches “oil refinery construction 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 oil refinery construction 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 oil refinery construction companies, and records with no verified work email. Companies headquartered outside Spain 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, 2,944 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 15, 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 oil refinery construction 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 oil refinery construction companies are there based in Spain?

RevenueBase identified 130 oil refinery construction companies headquartered in Spain 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?

Tecnicas Reunidas, headquartered in Madrid, tops this list with the largest team on record.

Which city has the most oil refinery construction companies?

Madrid leads with 24 headquartered companies, followed by Sevilla (6) and Barcelona (4).

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 2,944 verified decision-maker contacts tracked across these 130 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 15, 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.