Company lists · Data refreshed September 2026

Top 25 Offshore environmental consulting worldwide

Name: Offshore environmental consulting worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 16,393 companies tracked

RevenueBase identified 16,393 company matches for offshore environmental consulting worldwide as of September 2026 and tracks 242,443 professional contacts across them, including 66,463 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers company matches for offshore environmental consulting 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 September 20, 2026. Country and city lists for offshore environmental consulting 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 Sep 20, 2026 How this list was built

16,393Companies

242,443Contacts tracked

66,463Verified emails

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The 25 largest offshore environmental consulting worldwide

Ranked by team size

Top 25 of 16,393 company matches for offshore environmental consulting worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 20, 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	Seatrium	Exact match	United StatesHQ recorded Sep 20, 2026	10001+	4,522 contacts →
	Exact match “A Premier Global Player with Deep Engineering Expertise in the offshore, marine and energy industries Engineering our Future Together.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
2	Deme Group	Exact match	Beveren-kruibeke-zwijndrecht, BelgiumHQ recorded Sep 20, 2026	5,001-10,000	4,395 contacts →
	Exact match “DEME (Euronext Brussels: DEME) is a leading contractor in the fields of offshore energy, dredging and marine infrastructure, and environmental remediation.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
3	Ortec Group	Exact match	Aix-en-provence, FranceHQ recorded Sep 20, 2026	10001+	3,436 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 · Sep 20, 2026 · View company records in RevenueBase
4	Heerema Marine Contractors	Exact match	Leiden, NetherlandsHQ recorded Sep 20, 2026	1,001-5,000	2,643 contacts →
	Exact match “Heerema Marine Contractors is a world-leading marine contractor in the international offshore energy industry.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
5	Allseas	Exact match	Châtel-saint-denis, SwitzerlandHQ recorded Sep 20, 2026	1,001-5,000	2,554 contacts →
	Exact match “Allseas is a world-leading contractor in the offshore energy market.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
6	Zamil Offshore Services Company	Exact match	Al-khobar, Saudi ArabiaHQ recorded Sep 20, 2026	1,001-5,000	2,312 contacts →
	Exact match “Zamil Offshore Services Company has been offering diversified offshore and marine support services to the oil and gas industry since 1977.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
7	ZMI Holdings	Exact match	Abu Dhabi, United Arab EmiratesHQ recorded Sep 20, 2026	1,001-5,000	1,917 contacts →
	Exact match “ZMI Holdings an ADNOC L&S company THE NEW WAVE Transforming the Offshore Energy Industry An integrated service provider offering unparalleled commitment.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
8	Swca Environmental Consultants	Exact match	Phoenix, AZ, United StatesHQ recorded Sep 20, 2026	1,001-5,000	1,629 contacts →
	Exact match “Founded on a commitment to sound science and creative solutions, SWCA is a leader in environmental and management consulting services.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
9	Montrose Environmental Group	Exact match	Little Rock, AR, United StatesHQ recorded Sep 20, 2026	1,001-5,000	1,529 contacts →
	Exact match “Onterris (formerly Montrose Environmental Group) was one of the first to see environmental responsibility as not just an imperative but as a strategic asset.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
10	Tp-Otc	Exact match	Çankaya, TürkiyeHQ recorded Sep 20, 2026	501-1,000	1,501 contacts →
	Exact match “TP-OTC is established to provide all engineering and technology services for offshore operations in oil and gas industry.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
11	Vulcain Engineering Group	Exact match	Neuilly-sur-seine, FranceHQ recorded Sep 20, 2026	5,001-10,000	1,496 contacts →
	Exact match “Vulcain Engineering Group is a multi-specialist engineering and consulting group serving industrial companies across the globe, focused on critical sectors: energy, health…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
12	Maersk Supply Service	Exact match	Rio De Janeiro, BrazilHQ recorded Sep 20, 2026	201-500	1,407 contacts →
	Exact match “With more than 50 years of legacy, Maersk Supply Service celebrates a new important milestone: from November 1st, our headquarters are officially located in Brazil.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
13	Deepocean	Exact match	Oslo, NorwayHQ recorded Sep 20, 2026	1,001-5,000	1,375 contacts →
	Exact match “DeepOcean is a technology-driven, independent solution provider in the ocean space.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
14	CCC Underwater Engineering S.A.L	Exact match	Abu Dhabi, United Arab EmiratesHQ recorded Sep 20, 2026	201-500	1,279 contacts →
	Exact match “(Underwater Engineering) S.A.L was established in 1976.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
15	RSK Group	Exact match	Helsby, United KingdomHQ recorded Sep 20, 2026	10001+	1,255 contacts →
	Exact match “RSK Group is a global leader in the delivery of environmental and engineering solutions.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
16	Aries Marine And Engineering Services	Exact match	United Arab EmiratesHQ recorded Sep 20, 2026	1,001-5,000	1,216 contacts →
	Exact match “Aries is the largest Engineering, Inspection & Maintenance firm in the Middle East.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
17	DGE Danmark	Exact match	Højbjerg, DenmarkHQ recorded Sep 20, 2026	n/a	1,176 contacts →
	Exact match “Miljø er vores kernekompetence og vores ansvar.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
18	Apex Companies	Exact match	Rockville, MD, United StatesHQ recorded Sep 20, 2026	1,001-5,000	1,137 contacts →
	Exact match “Who is Apex?” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
19	Barr Engineering CO	Exact match	Minneapolis, MN, United StatesHQ recorded Sep 20, 2026	1,001-5,000	1,088 contacts →
	Exact match “Barr provides engineering and environmental consulting services to clients across the Midwest, throughout the Americas, and around the world.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
20	Shearwater Geoservices	Exact match	Laksevåg, NorwayHQ recorded Sep 20, 2026	1,001-5,000	1,031 contacts →
	Exact match “Shearwater is a global marine geoscience and technology business.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
21	Trinity Consultants	Exact match	Dallas, TX, United StatesHQ recorded Sep 20, 2026	1,001-5,000	961 contacts →
	Exact match “Trinity Consultants is a global team of experts helping organizations solve complex challenges in environmental compliance, ecological protection, infrastructure performance, and…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
22	Jana Marine Service Company LLC	Exact match	Khobar, Saudi ArabiaHQ recorded Sep 20, 2026	501-1,000	916 contacts →
	Exact match “Provides first-class marine offshore Services to the Oil & Gas sector in the Arabian Gulf region and beyond.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
23	Mantle Solutions	Exact match	Kochi, IndiaHQ recorded Sep 20, 2026	1,001-5,000	900 contacts →
	Exact match “Mantle Solutions is the registered offshore technology and professional services firm for LuLu Group International, a highly diversified conglomerate with business entities…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
24	ATC Group Services LLC	Exact match	Lafayette, LA, United StatesHQ recorded Sep 20, 2026	1,001-5,000	865 contacts →
	Exact match “ATC Group Services LLC is now Atlas.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
25	Pares&alvarez	Exact match	Santiago, ChileHQ recorded Sep 20, 2026	501-1,000	807 contacts →
	Exact match “We are Pares & Alvarez, our extensive experience and the recognition of our clients makes us one of the leading Engineering Companies in environmental, consulting, engineering and…” Recorded in the RevenueBase company graph · Sep 20, 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 “offshore environmental consulting”. 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 16,393 offshore environmental consulting worldwide

See the full list, filter by size, metro and specialty, and access 66,463 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Offshore environmental consulting worldwide at a glance

As of Sep 20, 2026

27.4%Verified-email coverage

14.8Average contacts per company

1-10Median size (employees)

1.4%Largest-city concentration · Sao Paulo

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

9,946

11-50

4,690

51-200

1,217

201-500

285

501-1,000

1,001-5,000

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 offshore environmental consulting are linked below.
What qualifies: Company records worldwide whose business descriptions match “offshore environmental consulting” 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 66,463 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 September 20, 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.

Offshore environmental consulting by location

61 lists · largest first

Every Offshore environmental consulting 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 “offshore environmental consulting”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many offshore environmental consulting are there worldwide?

RevenueBase identified 16,393 company matches for offshore environmental consulting worldwide as of September 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?

Seatrium tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which country has the most offshore environmental consulting?

The United States leads with 2,465 companies, followed by Brazil (2,338) and the United Kingdom (1,096). Every offshore environmental consulting list by country and city is linked on this page.

Which city has the most offshore environmental consulting?

Sao Paulo leads with 229 company records, followed by Rio De Janeiro (167) and Houston (153).

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 66,463 professional contacts with verified work emails tracked across these 16,393 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 September 20, 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.