Company lists · Data refreshed September 2026

Top 25 Downstream petroleum construction firms based in Spain

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

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 406 companies tracked

RevenueBase identified 406 downstream petroleum construction firms headquartered in Spain as of September 2026 and tracks 22,672 professional contacts across them, including 3,485 with verified work emails. Madrid is the largest hub.

This list covers downstream petroleum construction firms 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 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

406Companies

22,672Contacts tracked

3,485Verified emails

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The 25 largest downstream petroleum construction firms based in Spain

Ranked by team size

Top 25 of 406 downstream petroleum construction firms based in Spain, 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	Tecnicas Reunidas	Partial evidence	Madrid, SpainHQ checked Sep 16, 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 16, 2026
2	Dragados Offshore	Indirect evidence	11510 Puerto Real, SpainHQ checked Sep 16, 2026	1,001-5,000	1,348 contacts →
	Indirect evidence “Founded in 1972, Dragados Offshore S.A.” Source: RevenueBase Database · checked Sep 16, 2026
3	Nervion Industries, Engineering & Services, S.L	Indirect evidence	Bilbao, SpainHQ checked Sep 16, 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 16, 2026
4	Tamoin	Indirect evidence	Erandio/ Altzaga, SpainHQ checked Sep 16, 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 16, 2026
5	Sampol	Indirect evidence	Palma, SpainHQ checked Sep 16, 2026	1,001-5,000	581 contacts →
	Indirect evidence “SAMPOL is an independent, multinational, family owned company founded in 1934 and a leader in the implementation of Energy projects, Electrical installations, Telecommunications…” Source: RevenueBase Database · checked Sep 16, 2026
6	Grupo Masa	Indirect evidence	Madrid, SpainHQ checked Sep 16, 2026	1,001-5,000	450 contacts →
	Indirect evidence “MASA interviene en toda la cadena de actividades en la vida de las instalaciones e infraestructuras, desde su fase de proyecto, hasta la construcción y montaje de la instalación…” Source: RevenueBase Database · checked Sep 16, 2026
7	Intecsa Industrial	Indirect evidence	Madrid, SpainHQ checked Sep 16, 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 16, 2026
8	Isastur	Indirect evidence	Llanera, SpainHQ checked Sep 16, 2026	1,001-5,000	371 contacts →
	Indirect evidence “El holding ISASTUR está integrado por un conjunto de empresas con distintas actividades que por su tradición y experiencia están fundamentalmente vinculadas con el sector de la…” Source: RevenueBase Database · checked Sep 16, 2026
9	Df-Duro Felguera	Indirect evidence	Gijón, SpainHQ checked Sep 16, 2026	1,001-5,000	301 contacts →
	Indirect evidence “Duro Felguera is a global company based in Asturias.” Source: RevenueBase Database · checked Sep 16, 2026
10	Técnicas Reunidas Initec	Indirect evidence	Madrid, SpainHQ checked Sep 16, 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 16, 2026
11	Kaefer Servicios Industriales	Indirect evidence	Erandio, SpainHQ checked Sep 16, 2026	1,001-5,000	261 contacts →
	Indirect evidence “At KAEFER, we are your strategic partner for integrated industrial maintenance solutions.” Source: RevenueBase Database · checked Sep 16, 2026
12	ACISA	Partial evidence	Madrid, SpainHQ checked Sep 16, 2026	201-500	232 contacts →
	Partial evidence “Elevate your expectations with ACISA, a proud member of the prestigious Aldesa Group, Spain's construction titan.” Source: RevenueBase Database · checked Sep 16, 2026
13	Teiga TMI	Indirect evidence	Bergondo, SpainHQ checked Sep 16, 2026	201-500	204 contacts →
	Indirect evidence “TEIGA TMI es una empresa con más de 40 años de experiencia, que ofrece soluciones y servicios de ingeniería; montaje y mantenimiento mecánico-eléctrico; con implantación en…” Source: RevenueBase Database · checked Sep 16, 2026
14	Mmypem JR S.L.U	Indirect evidence	As Pontes De García Rodríguez, SpainHQ checked Sep 16, 2026	51-200	158 contacts →
	Indirect evidence “MONTAJES MECÁNICOS Y PUESTA EN MARCHA J.R.” Source: RevenueBase Database · checked Sep 16, 2026
15	Lointek	Indirect evidence	Urduliz, SpainHQ checked Sep 16, 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 16, 2026
16	Techno PRO Hispania	Indirect evidence	Cartagena, SpainHQ checked Sep 16, 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 16, 2026
17	Novargi	Indirect evidence	Vitoria-gasteiz, SpainHQ checked Sep 16, 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 16, 2026
18	IDESA	Indirect evidence	Gijón, SpainHQ checked Sep 16, 2026	201-500	114 contacts →
	Indirect evidence “Founded in 1993, IDESA has grown to become one of the most currently recognized and respected companies in the design, fabrication and supply of static and modular equipment…” Source: RevenueBase Database · checked Sep 16, 2026
19	Eia21	Indirect evidence	Erandio, SpainHQ checked Sep 16, 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 16, 2026
20	Iturcemi Grupo	Indirect evidence	Avilés, SpainHQ checked Sep 16, 2026	51-200	100 contacts →
	Indirect evidence “Iturcemi ingeniería con más de 25 años de experiencia, siendo un referente en el sector en el Norte de España.” Source: RevenueBase Database · checked Sep 16, 2026
21	Propav Infraestructuras	Indirect evidence	Madrid, SpainHQ checked Sep 16, 2026	1,001-5,000	99 contacts →
	Indirect evidence “Propav Infraestructuras (Propav) is an international company, specializing in the provision of multidisciplinary and sustainable services in the sector of infrastructure…” Source: RevenueBase Database · checked Sep 16, 2026
22	Entrerrios Automatizacion S.A	Indirect evidence	Pedrola, SpainHQ checked Sep 16, 2026	201-500	98 contacts →
	Indirect evidence “Grupo empresarial líder en instalaciones industriales a nivel nacional e internacional.” Source: RevenueBase Database · checked Sep 16, 2026
23	Azcatec Tecnología E Ingeniería	Indirect evidence	Sevilla, SpainHQ checked Sep 16, 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 16, 2026
24	Diseprosa	Indirect evidence	Madrid, SpainHQ checked Sep 16, 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 16, 2026
25	Dynatec, S.A	Indirect evidence	Madrid, SpainHQ checked Sep 16, 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 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 406 downstream petroleum construction firms based in Spain

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Downstream petroleum construction firms based in Spain at a glance

As of Sep 16, 2026

15.4%Verified-email coverage

55.8Average contacts per company

11-50Median size (employees)

11.3%Largest-city concentration · Madrid

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

109

11-50

177

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 406 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 Spain 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 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, 3,485 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 Madrid46

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 Spain?

RevenueBase identified 406 downstream petroleum construction firms 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 downstream petroleum construction firms?

Madrid leads with 46 headquartered companies, followed by Barcelona (12) and Gijon (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 3,485 verified decision-maker contacts tracked across these 406 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.