Company lists · Data refreshed September 2026

Top 25 Ocean engineering firms based in France

Name: Ocean engineering firms based in France
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 126 companies tracked

RevenueBase identified 126 ocean engineering firms headquartered in France as of September 2026 and tracks 7,231 professional contacts across them, including 2,116 with verified work emails. Lorient is the largest hub.

This list covers ocean engineering firms headquartered in France, 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.

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

126Companies

7,231Contacts tracked

2,116Verified emails

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The 25 largest ocean engineering firms based in France

Ranked by team size

Top 25 of 126 ocean engineering firms based in France, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to ocean 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	Chantiers DE L'atlantique	Indirect evidence	Saint-nazaire, FranceHQ checked Sep 17, 2026	1,001-5,000	2,004 contacts →
	Indirect evidence “Installée sur la façade Atlantique, Chantiers de l’Atlantique est une entreprise de construction maritime (paquebots, sous-stations…) et de services aux flottes.” Source: RevenueBase Database · checked Sep 17, 2026
2	Groupe Ponticelli Frères	Indirect evidence	FranceHQ checked Sep 17, 2026	5,001-10,000	1,829 contacts →
	Indirect evidence “The Ponticelli Frères Group is one of the main European service suppliers to companies in the energy (oil and gas, nuclear, renewable energy), industrial (chemical, steelworks…” Source: RevenueBase Database · checked Sep 17, 2026
3	Foure Lagadec	Indirect evidence	Le Havre, FranceHQ checked Sep 17, 2026	1,001-5,000	718 contacts →
	Indirect evidence “Building on its industrial heritage, its strong ties to the Snef Group, and its commitment to innovation, Fouré Lagadec continues to evolve to meet the technical and energy…” Source: RevenueBase Database · checked Sep 17, 2026
4	Geocean	Indirect evidence	Cassis, FranceHQ checked Sep 17, 2026	n/a	216 contacts →
	Indirect evidence “GEOCEAN is a marine work contractor, based near Marseille, in the south of France, with 30 years experience worldwide.” Source: RevenueBase Database · checked Sep 17, 2026
5	Creocean	Indirect evidence	La Rochelle, FranceHQ checked Sep 17, 2026	51-200	90 contacts →
	Indirect evidence “Notre expertise au service des océans et des littoraux : Notre bureau d'études accompagne les projets sur l’ensemble du littoral français et à l’international, avec une expertise…” Source: RevenueBase Database · checked Sep 17, 2026
6	Stat Marine	Partial evidence	Nîmes, FranceHQ checked Sep 17, 2026	51-200	81 contacts →
	Partial evidence “Created in 1983, STAT MARINE is an entrepreneurial and client-focused organisation; it has won its reputation not only for its practical approach to operational and engineering…” Source: RevenueBase Database · checked Sep 17, 2026
7	Hydroconsult Sarl	Indirect evidence	Kervignac, FranceHQ checked Sep 17, 2026	11-50	49 contacts →
	Indirect evidence “Hydroconsult is a recognized actor in worldwide Hydrographic and Geophysical Survey's assistance and Marine Consulting, with 20 years experience.” Source: RevenueBase Database · checked Sep 17, 2026
8	Watertracks	Indirect evidence	Perols, FranceHQ checked Sep 17, 2026	11-50	28 contacts →
	Indirect evidence “Ingénierie et services subaquatiques robotisés.” Source: RevenueBase Database · checked Sep 17, 2026
9	Geps Techno	Indirect evidence	Guérande, FranceHQ checked Sep 17, 2026	11-50	25 contacts →
	Indirect evidence “GEPS Techno builds and operates autonomous, connected offshore platforms serving as persistent floating infrastructure for maritime monitoring & surveillance, along with other…” Source: RevenueBase Database · checked Sep 17, 2026
10	Mareal	Partial evidence	L'haÿ-les-roses, FranceHQ checked Sep 17, 2026	11-50	25 contacts →
	Partial evidence “Mareal: Engineering the Future of Offshore Innovation Since its inception in 2002, Mareal has established itself as a leading force in offshore engineering, spanning the entire…” Source: RevenueBase Database · checked Sep 17, 2026
11	D2m Engineering	Indirect evidence	Six Fours Les Plages, FranceHQ checked Sep 17, 2026	11-50	19 contacts →
	Indirect evidence “At d2m, our expert team of marine engineers, naval architects, and offshore contractors have been committed to crafting innovative solutions for complex maritime projects for over…” Source: RevenueBase Database · checked Sep 17, 2026
12	Rivoyre Ingénierie	Indirect evidence	Valbonne, FranceHQ checked Sep 17, 2026	11-50	14 contacts →
	Indirect evidence “With over 30 years of expertise, Rivoyre Ingénierie excels in the calculation of composite and aluminum structures for leisure maritime construction.” Source: RevenueBase Database · checked Sep 17, 2026
13	Idra BIO ET Littoral	Indirect evidence	Bruz, FranceHQ checked Sep 17, 2026	11-50	13 contacts →
	Indirect evidence “IDRA BIO ET LITTORAL is an oceanography services company based out of LA HAYE DE PAN, BRUZ, France.” Source: RevenueBase Database · checked Sep 17, 2026
14	Flexifrance	Indirect evidence	Le Trait, FranceHQ checked Sep 17, 2026	11-50	13 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
15	DV Offshore	Indirect evidence	Saint-cloud, FranceHQ checked Sep 17, 2026	1-10	13 contacts →
	Indirect evidence “DV Offshore’s expertise includes floating systems, terminals, mooring systems, floating wind turbines, subsea production, pipelines & risers, allowing us to provide technical and…” Source: RevenueBase Database · checked Sep 17, 2026
16	TES Technifor	Indirect evidence	Gondreville, FranceHQ checked Sep 17, 2026	11-50	13 contacts →
	Indirect evidence “Aujourd’hui acteur majeur des travaux spéciaux dans tout le quart Nord Est de la France, T.E.S.(Travaux Entretien Subaquatiques) fut fondée en 1982 par Patrick CHAMPLON à Toul.” Source: RevenueBase Database · checked Sep 17, 2026
17	Oceanide	Indirect evidence	La Seyne Sur Mer, FranceHQ checked Sep 17, 2026	11-50	12 contacts →
	Indirect evidence “Oceanide operates a unique combination of tests facilities in France including the BGO deep water basin (waves, wind, current), a wave flume and a shallow water wave tank.” Source: RevenueBase Database · checked Sep 17, 2026
18	Actimar	Indirect evidence	Brest, FranceHQ checked Sep 17, 2026	11-50	12 contacts →
	Indirect evidence “Depuis plus de 20 ans, Actimar apporte son expertise au service de la mer.” Source: RevenueBase Database · checked Sep 17, 2026
19	Kappa Offshore Solutions	Partial evidence	St-Nazaire, FranceHQ checked Sep 17, 2026	1-10	12 contacts →
	Partial evidence “Kappa Offshore Solutions is a marine engineering company specialized in offshore seismic data acquisition.” Source: RevenueBase Database · checked Sep 17, 2026
20	Acri-In	Partial evidence	Biot, FranceHQ checked Sep 17, 2026	11-50	11 contacts →
	Partial evidence “The company specializes in maritime, river and coastal engineering.” Source: RevenueBase Database · checked Sep 17, 2026
21	Énergie DE LA Lune	Indirect evidence	Bordeaux, FranceHQ checked Sep 17, 2026	1-10	11 contacts →
	Indirect evidence “Énergie de la Lune est un cabinet d'ingénierie spécialisé en Énergies Marines Renouvelables et en génie océanographique.” Source: RevenueBase Database · checked Sep 17, 2026
22	Iceo Environnement	Indirect evidence	Talmont-saint-hilaire, FranceHQ checked Sep 17, 2026	1-10	8 contacts →
	Indirect evidence “ICEO - Ingénierie, Conseil, Expertise dans le domaine de l'eau est un bureau d'études spécialisé dans le domaine des milieux aquatiques et l'environnement littoral.” Source: RevenueBase Database · checked Sep 17, 2026
23	Athos Environnement	Indirect evidence	Clermont Ferrand, FranceHQ checked Sep 17, 2026	11-50	8 contacts →
	Indirect evidence “ATHOS Environnement est une entreprise spécialisée dans l’ingénierie des milieux aquatiques située en plein cœur de l’Auvergne, à Clermont-Ferrand.” Source: RevenueBase Database · checked Sep 17, 2026
24	Delion Architecture Navale	Indirect evidence	Nantes, FranceHQ checked Sep 17, 2026	1-10	8 contacts →
	Indirect evidence “Agence d'architectes navals pour la plaisance et les professionnels.” Source: RevenueBase Database · checked Sep 17, 2026
25	Nautilus Dynamics	Partial evidence	Nice, FranceHQ checked Sep 17, 2026	1-10	8 contacts →
	Partial evidence “OFFSHORE ENGINEERING SOLUTIONS At NAUTILUS DYNAMICS, we support and provide solutions to our clients in the offshore wind, oil and gas, floating PV, ports and other coastal…” 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: ocean 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 ocean engineering firms.
Partial evidence: Its own public description names part of ocean engineering firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name ocean 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 126 ocean engineering firms based in France

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Ocean engineering firms based in France at a glance

As of Sep 17, 2026

29.3%Verified-email coverage

57.4Average contacts per company

1-10Median size (employees)

4.8%Largest-city concentration · Lorient

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Email recency for this list is measured worldwide rather than for France, so it is reported there. Company counts and contact totals on this page are exact for France, over 126 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 ocean 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.
What qualifies: Companies headquartered in France whose own description of what they do matches “ocean 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 ocean 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 ocean engineering firms, and records with no verified work email. Companies headquartered outside France 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, 2,116 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.

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 ocean 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 ocean engineering firms are there based in France?

RevenueBase identified 126 ocean engineering firms headquartered in France 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?

Chantiers DE L'atlantique, headquartered in Saint-Nazaire, tops this list with the largest team on record.

Which city has the most ocean engineering firms?

Lorient leads with 6 headquartered companies, followed by Marseille (5) and Nice (5).

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 2,116 verified decision-maker contacts tracked across these 126 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.