Company lists · Data refreshed September 2026

Top 25 Business advisory and consulting firms based in Nantes, France

Name: Business advisory and consulting firms based in Nantes, France
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 23, 2026 86 companies tracked

RevenueBase identified 86 business advisory and consulting firms headquartered in Nantes, France as of September 2026 and tracks 399 professional contacts across them, including 189 with verified work emails. Paris is the largest hub.

This list covers business advisory and consulting firms headquartered in Nantes, 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 23, 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 23, 2026 86% judged on-target in blind review

86Companies

399Contacts tracked

189Verified emails

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The 25 largest business advisory and consulting firms based in Nantes, France

Ranked by team size

Top 25 of 86 business advisory and consulting firms based in Nantes, France, ranked by team size, largest first. Data refreshed Sep 23, 2026. RevenueBase Smart Search rates how each company's information relates to business advisory and consulting 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	OZEO	Indirect evidence	Nantes, FranceHQ checked Sep 23, 2026	51-200	51 contacts →
	Indirect evidence “Cabinet d'Expertise Comptable né du rapprochement des deux cabinets Fradin & Associés et Secogerec, installés au centre ville de Nantes et en Sud Loire, Ozéo travaille aux côtés…” Source: RevenueBase Database · checked Sep 23, 2026
2	ONE ACE Expertise Comptable	Indirect evidence	Nantes, FranceHQ checked Sep 23, 2026	51-200	49 contacts →
	Indirect evidence “Nous, c’est One Ace.” Source: RevenueBase Database · checked Sep 23, 2026
3	Audencia Junior Conseil	Indirect evidence	Nantes, FranceHQ checked Sep 23, 2026	11-50	49 contacts →
	Indirect evidence “Audencia Junior Conseil, Junior Entreprise de l’école de commerce Audencia Nantes, réalise depuis plus de 30 ans des prestations de conseil : étude de marché, étude de…” Source: RevenueBase Database · checked Sep 23, 2026
4	SK Willing	Partial evidence	Nantes, FranceHQ checked Sep 23, 2026	11-50	29 contacts →
	Partial evidence “Cabinet de conseil en organisation et management, SK Consulting est implanté à Nantes et Niort et accompagne de nombreux acteurs de la région Grand Ouest dans leurs projets de…” Source: RevenueBase Database · checked Sep 23, 2026
5	Harold Avocats	Indirect evidence	Nantes, FranceHQ checked Sep 23, 2026	11-50	20 contacts →
	Indirect evidence “Harold est un cabinet spécialisé en droit des affaires et stratégie d’entreprise.” Source: RevenueBase Database · checked Sep 23, 2026
6	Cayola Consulting	Indirect evidence	Nantes, FranceHQ checked Sep 23, 2026	11-50	15 contacts →
	Indirect evidence “CAYOLA est un cabinet indépendant accompagnant dirigeants et entreprises dans leurs enjeux stratégiques, économiques, financiers et organisationnels.” Source: RevenueBase Database · checked Sep 23, 2026
7	KER	Indirect evidence	Nantes, FranceHQ checked Sep 23, 2026	11-50	14 contacts →
	Indirect evidence “Cabinet d'Expertise Comptable sur Nantes.” Source: RevenueBase Database · checked Sep 23, 2026
8	Copagex Bien Plus QUE Votre Expert-Comptable	Indirect evidence	Nantes, FranceHQ checked Sep 23, 2026	1-10	10 contacts →
	Indirect evidence “Le cabinet Copagex, son équipe et ses solutions vous accompagne vers votre plein potentiel.” Source: RevenueBase Database · checked Sep 23, 2026
9	Amnis Consulting	Partial evidence	Nantes, FranceHQ checked Sep 23, 2026	1-10	9 contacts →
	Partial evidence “Créé en 2012, AMNIS Consulting est un cabinet de conseil en management et projets de transformation.” Source: RevenueBase Database · checked Sep 23, 2026
10	The Human Consulting Group	Partial evidence	Nantes, FranceHQ checked Sep 23, 2026	11-50	8 contacts →
	Partial evidence “The Human Consulting Group - HCG, Société de Conseil en stratégie spécialisée en Relation Client.” Source: RevenueBase Database · checked Sep 23, 2026
11	Yellodit	Indirect evidence	Nantes, FranceHQ checked Sep 23, 2026	1-10	8 contacts →
	Indirect evidence “Yellodit n'est pas votre cabinet d'expertise comptable habituel.” Source: RevenueBase Database · checked Sep 23, 2026
12	UDW	Indirect evidence	Nantes, FranceHQ checked Sep 23, 2026	1-10	7 contacts →
	Indirect evidence “Up Down Wind Think, Plan and Excute your Performance 20 consultants for U!” Source: RevenueBase Database · checked Sep 23, 2026
13	Adeo Conseil & Finance	Indirect evidence	Nantes, FranceHQ checked Sep 23, 2026	1-10	5 contacts →
	Indirect evidence “Nous accompagnons des dirigeants de PME sur leurs sujets de finance : recherche de financement, levée de fonds, structuration d'opérations complexes, accompagnement dans la durée…” Source: RevenueBase Database · checked Sep 23, 2026
14	GSE Conseil	Indirect evidence	Nantes, FranceHQ checked Sep 23, 2026	1-10	4 contacts →
	Indirect evidence “Notre Cabinet GSE CONSEIL propose une large déclinaison de prestations de conseil RH avec le recrutement pour cœur de métier.” Source: RevenueBase Database · checked Sep 23, 2026
15	Pallier-Denis Associes	Indirect evidence	Nantes, FranceHQ checked Sep 23, 2026	1-10	3 contacts →
	Indirect evidence “50 ans d'expérience au service des entreprises” Source: RevenueBase Database · checked Sep 23, 2026
16	Actyvea	Indirect evidence	Nantes, FranceHQ checked Sep 23, 2026	1-10	3 contacts →
	Indirect evidence “Cabinet conseil en stratégie créé à Nantes, Actyvea accompagne depuis 2010 les PME et ETI à développer des stratégies innovantes, concevoir des offres innovantes centrées clients…” Source: RevenueBase Database · checked Sep 23, 2026
17	ONE Bridge ET Associés	Indirect evidence	Nantes, FranceHQ checked Sep 23, 2026	1-10	3 contacts →
	Indirect evidence “One Bridge et Associés est un Cabinet de conseils en transmission d'entreprises intervenant aussi bien en accompagnement sur des problématiques de développement via la croissance…” Source: RevenueBase Database · checked Sep 23, 2026
18	Edelsen	Indirect evidence	Nantes, FranceHQ checked Sep 23, 2026	1-10	3 contacts →
	Indirect evidence “EDELSEN is an accounting company based out of 58 rue Bastille, NANTES, France.” Source: RevenueBase Database · checked Sep 23, 2026
19	Sycomore Advisory	Partial evidence	Nantes, FranceHQ checked Sep 23, 2026	1-10	2 contacts →
	Partial evidence “Sycomore Advisory, ce sont quatre domaines d'expertise complémentaires - Services de transaction / Transaction services * Évaluation d'entreprise : obtenir une valeur objective de…” Source: RevenueBase Database · checked Sep 23, 2026
20	Vialta Patrimoine	Indirect evidence	Nantes, FranceHQ checked Sep 23, 2026	1-10	2 contacts →
	Indirect evidence “Société de conseil en gestion de patrimoine, courtage en assurance et financement” Source: RevenueBase Database · checked Sep 23, 2026
21	Advalians	Indirect evidence	Nantes, FranceHQ checked Sep 23, 2026	1-10	2 contacts →
	Indirect evidence “Né de la volonté de guider les entreprises dans leurs décisions stratégiques en marketing, communication et digital, le Cabinet Advalians s’érige comme un phare dans un monde en…” Source: RevenueBase Database · checked Sep 23, 2026
22	Capéval Finance	Indirect evidence	Nantes, FranceHQ checked Sep 23, 2026	1-10	1 contacts →
	Indirect evidence “Capéval Finance est une société de conseil spécialisée en évaluation financière et assistance à la résolution de contentieux économiques - Evaluation d’entreprises, de branches…” Source: RevenueBase Database · checked Sep 23, 2026
23	Axetis	Indirect evidence	Nantes, FranceHQ checked Sep 23, 2026	1-10	1 contacts →
	Indirect evidence “Conseil en stratégie et marketing Axetis accompagne les indépendants, TPE, PME et ETI dans leurs projets en stratégie et marketing -> Définir la stratégie gagnante -> Bénéficier…” Source: RevenueBase Database · checked Sep 23, 2026
24	Cabinet Equilibre	Indirect evidence	Nantes, FranceHQ checked Sep 23, 2026	1-10	1 contacts →
	Indirect evidence “Conseil et accompagnement en reprise d'entreprise” Source: RevenueBase Database · checked Sep 23, 2026
25	ET BYM	Indirect evidence	Nantes, FranceHQ checked Sep 23, 2026	1-10	1 contacts →
	Indirect evidence “CFO avec 15 ans d'expérience et un parcours d'entrepreneur couronné de réussites mais aussi d'échecs formateurs, j'aide mes clients à développer leur entreprise : 1.” Source: RevenueBase Database · checked Sep 23, 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: business advisory and consulting 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 business advisory and consulting firms.
Partial evidence: Its own public description names part of business advisory and consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name business advisory and consulting 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 86 business advisory and consulting firms based in Nantes, France

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Business advisory and consulting firms based in Nantes, France at a glance

As of Sep 23, 2026

47.4%Verified-email coverage

4.6Average contacts per company

1-10Median size (employees)

2624.4%Largest-city concentration · Paris

Sep 23, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

Email recency for this list is measured across the whole France list rather than for Nantes, so it is reported there. Company counts and contact totals on this page are exact for Nantes, over 86 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 business advisory and consulting 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 Nantes, France whose own description of what they do matches “business advisory and consulting 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 business advisory and consulting 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 business advisory and consulting firms, and records with no verified work email. Companies headquartered outside Nantes 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, 189 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 23, 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.

Business advisory and consulting firms by metro in France

Business advisory and consulting firms in Paris2257
Business advisory and consulting firms in Lyon291
Business advisory and consulting firms in Toulouse153
Business advisory and consulting firms in Bordeaux134
Business advisory and consulting firms in Marseille112
Business advisory and consulting firms in Nantes86
Business advisory and consulting firms in Lille78
Business advisory and consulting firms in Montpellier67
Business advisory and consulting firms in Rennes64
Business advisory and consulting firms in Strasbourg64
Business advisory and consulting firms in Boulogne-Billancourt48
Business advisory and consulting firms in Courbevoie46
Business advisory and consulting firms in Angers44
Business advisory and consulting firms in Neuilly-Sur-Seine43
Business advisory and consulting firms in Aix-En-Provence42
Business advisory and consulting firms in Versailles39
Business advisory and consulting firms in Nice37
Business advisory and consulting firms in Annecy36
Business advisory and consulting firms in Aix En Provence34
Business advisory and consulting firms in Tours30
Business advisory and consulting firms in Metz28
Business advisory and consulting firms in Boulogne Billancourt27
Business advisory and consulting firms in Reims27
Business advisory and consulting firms in Caen25
Business advisory and consulting firms in Levallois-Perret25

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 business advisory and consulting 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 business advisory and consulting firms are there based in Nantes, France?

RevenueBase identified 86 business advisory and consulting firms headquartered in Nantes, 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?

OZEO, headquartered in Nantes, tops this list with the largest team on record.

Which city has the most business advisory and consulting firms?

Paris leads with 2257 headquartered companies, followed by Lyon (291) and Toulouse (153).

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 189 verified decision-maker contacts tracked across these 86 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 23, 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.