Company lists · Data refreshed September 2026

Top 25 Marine and subsea consulting firms worldwide

Name: Marine and subsea consulting firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 20,669 companies tracked

RevenueBase identified 20,669 company matches for marine and subsea consulting firms worldwide as of September 2026 and tracks 675,308 professional contacts across them, including 169,695 with verified work emails. The United States is the largest market and Singapore the largest hub.

This list covers company matches for marine and subsea consulting firms 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 28, 2026. Country and city lists for marine and subsea consulting firms 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 28, 2026 How this list was built

20,669Companies

675,308Contacts tracked

169,695Verified emails

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The 25 largest marine and subsea consulting firms worldwide

Ranked by team size

Top 25 of 20,669 company matches for marine and subsea consulting firms worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 28, 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	Saipem	Exact match	Milan, ItalyHQ recorded Sep 28, 2026	10001+	34,095 contacts →
	Exact match “Saipem is a global leader in the engineering and construction of major projects for the energy and infrastructure sectors, both offshore and onshore.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
2	Tetra Tech	Exact match	Pasadena, CA, United StatesHQ recorded Sep 28, 2026	10001+	12,999 contacts →
	Exact match “Tetra Tech is the leader in water, environment and sustainable infrastructure, providing high-end technical and engineering services for projects worldwide.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
3	Oceaneering	Exact match	Houston, TX, United StatesHQ recorded Sep 28, 2026	10001+	12,031 contacts →
	Exact match “Oceaneering is a global technology company delivering engineered services and products and robotic solutions to the offshore energy, defense, aerospace, and manufacturing…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
4	Technip Former Company	Exact match	United KingdomHQ recorded Sep 28, 2026	10001+	11,255 contacts →
	Exact match “Technip is a former company that was separated into two independent companies: TechnipFMC and Technip Energies, which now operate with no capital ties.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
5	Tata Consulting Engineers	Exact match	Mumbai, IndiaHQ recorded Sep 28, 2026	5,001-10,000	8,440 contacts →
	Exact match “Tata Consulting Engineers Limited (TCE) is the largest Indian private sector engineering and project consultancy and an emerging global leader in integrated engineering solutions.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
6	Terracon	Exact match	Olathe, KS, United StatesHQ recorded Sep 28, 2026	5,001-10,000	6,113 contacts →
	Exact match “Terracon is a 100 percent employee-owned consulting engineering firm providing quality services to clients.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
7	Lamprell	Exact match	Sharjah, United Arab EmiratesHQ recorded Sep 28, 2026	5,001-10,000	6,080 contacts →
	Exact match “With 50 years of experience, Lamprell is a key player in the global offshore wind and oil & gas markets, delivering high-quality, complex energy infrastructure projects.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
8	Kongsberg Maritime	Exact match	Kongsberg, NorwayHQ recorded Sep 28, 2026	5,001-10,000	5,555 contacts →
	Exact match “Kongsberg Maritime is your trusted partner in navigating the complexities of the maritime industry.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
9	Seatrium	Exact match	United StatesHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
10	Deme Group	Exact match	Beveren-kruibeke-zwijndrecht, BelgiumHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
11	VAN Oord	Exact match	3063 Nh, NetherlandsHQ recorded Sep 28, 2026	5,001-10,000	4,364 contacts →
	Exact match “Van Oord is a leading international marine contractor focusing on dredging, infrastructure and offshore energy projects.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
12	Ortec Group	Exact match	Aix-en-provence, FranceHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
13	Boskalis	Exact match	Papendrecht, NetherlandsHQ recorded Sep 28, 2026	10001+	3,366 contacts →
	Exact match “Boskalis is a leading global services provider operating in the dredging, maritime infrastructure and maritime services sectors.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
14	WSP In India	Exact match	Noida, IndiaHQ recorded Sep 28, 2026	10001+	3,317 contacts →
	Exact match “We are one of the world’s leading professional services firms, uniting our engineering, advisory and science-based expertise to shape communities to advance humanity.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
15	Golder	Exact match	Vancouver, BC, CanadaHQ recorded Sep 28, 2026	5,001-10,000	3,167 contacts →
	Exact match “Golder was acquired by WSP.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
16	DOF	Exact match	Bergen, NorwayHQ recorded Sep 28, 2026	5,001-10,000	2,942 contacts →
	Exact match “With a multi-national workforce of over 5,700 personnel, DOF is an international group of companies which owns and operates a fleet of modern offshore/subsea vessels, with an…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
17	Gran Services S.A	Exact match	Macaé, BrazilHQ recorded Sep 28, 2026	1,001-5,000	2,752 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
18	Priner	Exact match	Rio De Janeiro, BrazilHQ recorded Sep 28, 2026	5,001-10,000	2,737 contacts →
	Exact match “Há mais de 40 anos, a Priner se destaca no setor de engenharia industrial e infraestrutura, oferecendo soluções com excelência técnica, seguras e eficientes.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
19	دار الرياض DAR AL Riyadh	Exact match	Riyadh, Saudi ArabiaHQ recorded Sep 28, 2026	1,001-5,000	2,720 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
20	NIRAS	Exact match	Allerød, DenmarkHQ recorded Sep 28, 2026	1,001-5,000	2,699 contacts →
	Exact match “At NIRAS, we engineer solutions for a shared future.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
21	Heerema Marine Contractors	Exact match	Leiden, NetherlandsHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
22	Allseas	Exact match	Châtel-saint-denis, SwitzerlandHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
23	Multiconsult	Exact match	Oslo, NorwayHQ recorded Sep 28, 2026	1,001-5,000	2,553 contacts →
	Exact match “Multiconsult Norway is one of the leading firms of architectures, consulting engineers and designers in Norway.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
24	Brown And Caldwell	Exact match	Walnut Creek, CA, United StatesHQ recorded Sep 28, 2026	1,001-5,000	2,473 contacts →
	Exact match “Headquartered in Walnut Creek, Calif, Brown and Caldwell is an employee-owned firm with 2,100+ professionals serving clients locally and globally from 52 locations.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
25	MAN Diesel & Turbo	Exact match	Augsburg, GermanyHQ recorded Sep 28, 2026	10001+	2,456 contacts →
	Exact match “MAN Energy Solutions enables its customers to achieve sustainable value creation in the transition towards a carbon neutral future.” Recorded in the RevenueBase company graph · Sep 28, 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 “marine and subsea consulting firms”. 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 20,669 marine and subsea consulting firms worldwide

See the full list, filter by size, metro and specialty, and access 169,695 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Marine and subsea consulting firms worldwide at a glance

As of Sep 28, 2026

25.1%Verified-email coverage

32.7Average contacts per company

11-50Median size (employees)

1.8%Largest-city concentration · Singapore

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

9,691

11-50

6,714

51-200

2,723

201-500

802

501-1,000

328

1,001-5,000

244

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 marine and subsea consulting firms are linked below.
What qualifies: Company records worldwide whose business descriptions match “marine and subsea consulting firms” 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 169,695 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 28, 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.

Marine and subsea consulting firms by location

108 lists · largest first

Every Marine and subsea consulting 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 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 “marine and subsea consulting firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many marine and subsea consulting firms are there worldwide?

RevenueBase identified 20,669 company matches for marine and subsea consulting firms 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?

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

Which country has the most marine and subsea consulting firms?

The United States leads with 2,325 companies, followed by the United Kingdom (1,939) and Brazil (1,111). Every marine and subsea consulting firms list by country and city is linked on this page.

Which city has the most marine and subsea consulting firms?

Singapore leads with 375 company records, followed by Houston (287) and London (256).

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 169,695 professional contacts with verified work emails tracked across these 20,669 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 28, 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.