# The 30 largest professional services firms in the Calvados department
Tamtam tracks 36 professional services firms headquartered in the Calvados department. This list ranks the 30 largest by number of employees on LinkedIn, led by Talenz Alteis, SOFICOM Walter France and Masselin Energie. Their median headcount is 11. Half of them were founded in 2006 or later. The most common headquarters are Caen (13), Colombelles (3) and Lisieux (2).
This selection of professional services firms in Calvados includes a mix of accounting, environmental, and engineering companies. Notable firms include Talenz Alteis, an independent accounting, audit, and wealth management firm; SOFICOM Walter France, offering accounting, audit, payroll, and tax services; Masselin Energie, specializing in electrical and HVAC engineering; and VIRIA, providing energy efficiency services for buildings. The list also features ELITT, which specializes in secure electronic transactions, and Parangon Patrimoine, offering personalized financial solutions.
A clear pattern among these companies is their strong concentration in Caen, which serves as the headquarters for many of the largest firms such as Talenz Alteis, SOFICOM Walter France, and Agileva. The companies range from well-established firms like Masselin Energie, founded in 1924, to newer entities such as GSF NEPTUNE OUEST, established in 2020.
π«π· Calvados Β· 30 companies Β· Updated Nov 11, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Talenz Alteis](https://www.tamtam.ai/c/talenz-alteis) (talenz.fr)
Independent firm providing accounting, audit, legal, social, HR, tax optimization, digital solutions, and wealth management services to business leaders. | Accounting | π«π· Caen | 400 | |
| 2 | [SOFICOM Walter France](https://www.tamtam.ai/c/soficom-walter-france) (soficom-walterfrance.com)
A leading independent firm in Normandy offering accounting, audit, payroll, legal, and tax services to SMEs and large corporations in various sectors | Accounting | π«π· Caen | 149 | 1968 |
| 3 | [Masselin Energie](https://www.tamtam.ai/c/masselin-energie) (masselin-energie.fr)
Specializing in electrical and HVAC engineering, MASSELIN Energie offers innovative solutions for buildings, focusing on digitalization, energy efficiency, and sustainability | Facilities Services | π«π· Ifs | 143 | 1924 |
| 4 | [Agileva](https://www.tamtam.ai/c/agileva) (agileva.fr)
Agileva has been serving small and medium-sized businesses for over 50 years, providing expertise in accounting and a wide range of associated services | Accounting | π«π· Caen | 106 | 1980 |
| 5 | [VIRIA](https://www.tamtam.ai/c/viria) (viria.fr)
Energy efficiency services for buildings, including energy management, equipment maintenance, installation, and environmental compliance solutions across various fuel types. | Environmental Services | π«π· Caen | 92 | 1963 |
| 6 | [GSF NEPTUNE OUEST](https://www.tamtam.ai/c/gsf-neptune-ouest) (gsf.fr)
A leading provider of cleanliness and associated services with a focus on human values and professionalism, operating internationally | Environmental Services | π«π· Caen | 84 | 2020 |
| 7 | [Parangon Patrimoine](https://www.tamtam.ai/c/parangon-patrimoine) (parangon-patrimoine.fr)
Parangon Patrimoine offers personalized financial solutions to clients, focusing on tax reduction, investment profitability, and optimal financing, seeking individuals with sales skills and a desire for professional growth | Investment Management | π«π· Deauville | 67 | 2001 |
| 8 | [ELITT](https://www.tamtam.ai/c/elitt) (elitt.com)
A B-to-B service company specializing in secure electronic transactions, offering expertise in evaluation, consultancy, and audit for various industries | Banking | π«π· Colombelles | 66 | 2008 |
| 9 | [TOPO ETUDES](https://www.tamtam.ai/c/topo-etudes) (topo-etudes.fr)
Specialized in aerial and underground energy distribution network design, topography, mapping, GIS, and non-collective sanitation system studies nationwide. | Research Services | π«π· Lisieux | 45 | 1990 |
| 10 | [FIDUTECH CONSEILS](https://www.tamtam.ai/c/fidutech-conseils) (fidutech-conseils.fr)
FIDUTECH CONSEILS supports entrepreneurs with personalized services in accounting, tax, legal, and wealth management, primarily in the Caen region and Normandy | Accounting | π«π· Fleury-sur-Orne | 28 | 1993 |
| 11 | [SFPN - Cabinet d'expertise comptable](https://www.tamtam.ai/c/sfpn-cabinet-d-expertise-comptable) (sfpn-expert-comptable-bayeux.fr)
SFPN is a dynamic team providing accounting, tax, legal services, and assistance with funding, budgeting, and legal structure selection for various businesses | Accounting | π«π· Bayeux | 25 | 1975 |
| 12 | [RΓ©fΓ©rence Expertise Groupe](https://www.tamtam.ai/c/reference-expertise-groupe)
RΓ©fΓ©rence Expertise specializes in automotive expertise with over 200 employees across 3 regions, offering services in collision management, technical support, and quality assurance | Information Services | π«π· HΓ©rouville-Saint-Clair | 17 | 2006 |
| 13 | [COGEDIAC](https://www.tamtam.ai/c/cogediac) (cogediac.com)
COGEDIAC specializes in audit, accounting, consulting, and social support, offering a wide range of services including association support, public sector entities, group consolidations, and more | Accounting | π«π· Caen | 16 | 1993 |
| 14 | [IBATEC Structure](https://www.tamtam.ai/c/ibatec-structure) (ibatec.fr)
Specialized in structural calculations for reinforced concrete, wood, and metal, this technical engineering firm in Basse-Normandie offers a wide range of services from design to execution | Civil Engineering | π«π· Caen | 13 | 1999 |
| 15 | [GESTELIA BASSE NORMANDIE](https://www.tamtam.ai/c/gestelia-basse-normandie)
Legal services company in Normandie, France, providing legal assistance and support from their office in Caen | Legal Services | π«π· Caen | 11 | |
| 16 | [ACR HUISSIERS](https://www.tamtam.ai/c/acr-huissiers) (huissier-caen-acr.fr)
ACR HUISSIERS is a legal services provider located in Caen, Normandie, France, specializing in serving legal documents and enforcing court orders | Legal Services | π«π· Caen | 10 | |
| 17 | [AF TELECOMS](https://www.tamtam.ai/c/af-telecoms) (aftelecoms.fr)
AF TΓ©lΓ©coms is an independent consulting company offering customized telecom solutions to professionals, from audits to implementation and maintenance, with a focus on cost-effectiveness and expertise | Telecommunications | π«π· Ranville | 9 | 2013 |
| 18 | [AIDES & FINANCEMENTS](https://www.tamtam.ai/c/aides-and-financements) (aides-financements.fr)
Aides & Financements helps businesses secure public and private funding for various projects like investments, innovation, recruitment, and expansion through tailored financial strategies | Business Consulting and Services | π«π· Carpiquet | 9 | 2012 |
| 19 | [MOINS EGAL PLUS](https://www.tamtam.ai/c/moins-egal-plus) (moinsegalplus.net)
A human-sized team dedicated to supporting business projects in various fields, offering accounting, legal, management, and strategic development services | Accounting | π«π· Saint-Contest | 9 | 2014 |
| 20 | [CAC 14 - Conseils et Audit Caennais](https://www.tamtam.ai/c/cac-14-conseils-et-audit-caennais) (cac14.fr)
CAC14 is a accounting firm in Caen, led by experts with over 30 years of experience They offer a wide range of services to assist clients with various business needs | Accounting | π«π· Caen | 9 | 2004 |
| 21 | [NEPSEN BATIMENT Caen](https://www.tamtam.ai/c/nepsen-batiment-caen) (nepsen.fr)
NEPSEN is an independent consulting and engineering firm specialized in energy transition, supporting public and private sector clients in sustainable and energy-efficient projects | Renewable Energy Semiconductor Manufacturing | π«π· Ifs | 7 | 2010 |
| 22 | [H2C Cabinet RH](https://www.tamtam.ai/c/h2c-cabinet-rh) (h2c.fr)
Specializing in career development and coaching, this company helps individuals and teams achieve success through listening, ethics, innovation, and support in facing future changes | Human Resources Services | π«π· Sallenelles | 7 | 2000 |
| 23 | [CBE EXPERTISE](https://www.tamtam.ai/c/cbe-expertise)
A small-sized company specializing in Accounting and Consulting services, leveraging over 20 years of experience through a network of consultants and partners nationwide | Accounting | π«π· Bayeux | 7 | 2015 |
| 24 | [AREHA - Bureau d'Etudes Thermique & Fluides](https://www.tamtam.ai/c/areha-bureau-d-etudes-thermique-and-fluides) (areha.fr)
A building thermal & fluid engineering firm offering energy optimization services, studies, audits, and advice including RE2020 thermal studies and carbon LCA | Construction | π«π· Caen | 6 | 2007 |
| 25 | [TEMPS PRIVE](https://www.tamtam.ai/c/temps-prive) (tempsprive.fr)
Specializing in consulting, coaching, and professional training for executives, managers, and leaders, focusing on improving team performance, talent identification, training, and coaching for career development | Business Consulting and Services | π«π· Caen | 6 | |
| 26 | [Incendis](https://www.tamtam.ai/c/incendis) (incendis.fr)
A professional firefighter training organization in Normandy, specializing in safety and prevention training tailored to each company's needs to reduce workplace accidents and illnesses | Professional Training and Coaching | π«π· Mondeville | 6 | 2017 |
| 27 | [ASSI](https://www.tamtam.ai/c/assi) (reso-ing.fr)
Specialized in Fire Safety, ASSI provides services such as SSI coordination, fire safety engineering, diagnostics, evacuation plans, and training for public, commercial, and industrial buildings | Research Services | π«π· Colombelles | 5 | 2006 |
| 28 | [ACTIVE INGENIERIE](https://www.tamtam.ai/c/active-ingenierie) (active-ingenierie.fr)
An architecture and planning company located in Colombelles, France, specializing in engineering solutions for various projects | Architecture and Planning | π«π· Colombelles | 5 | 2016 |
| 29 | [KRIBS CONSEILS PATRIMOINE](https://www.tamtam.ai/c/kribs-conseils-patrimoine) (kribsconseils.com)
A Caen-based company specializing in personalized financial, tax, and legal advisory services for business leaders, offering tailored solutions independently from financial groups | Financial Services | π«π· Caen | 5 | 2017 |
| 30 | [EXITEAM](https://www.tamtam.ai/c/exiteam) (exiteam.fr)
Providing consulting and expertise services in IT security to safeguard businesses from potential cyber threats and vulnerabilities | Computer and Network Security | π«π· Lisieux | 4 | 2010 |
## How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.
## More company lists in the Calvados department
- [The largest companies in the Calvados department](https://www.tamtam.ai/l/largest-companies-calvados) (672)
- [Companies with in-house R&D in the Calvados department](https://www.tamtam.ai/l/r-and-d-companies-calvados) (56)
- [Retail chains in the Calvados department](https://www.tamtam.ai/l/retail-chains-calvados) (55)
- [Manufacturers in the Calvados department](https://www.tamtam.ai/l/manufacturers-calvados) (51)
- [Public sector organisations in the Calvados department](https://www.tamtam.ai/l/public-sector-organisations-calvados) (48)
- [Education providers in the Calvados department](https://www.tamtam.ai/l/education-companies-calvados) (39)
- [Multinational companies in the Calvados department](https://www.tamtam.ai/l/multinational-companies-calvados) (34)
- [Hardware manufacturers in the Calvados department](https://www.tamtam.ai/l/hardware-companies-calvados) (33)
- [Construction companies in the Calvados department](https://www.tamtam.ai/l/construction-companies-calvados) (31)
- [Distributors and wholesalers in the Calvados department](https://www.tamtam.ai/l/distributors-and-wholesalers-calvados) (29)
- [Family-owned companies in the Calvados department](https://www.tamtam.ai/l/family-owned-companies-calvados) (28)
- [Government Administration companies in the Calvados department](https://www.tamtam.ai/l/government-administration-companies-calvados) (27)
- [IT services companies in the Calvados department](https://www.tamtam.ai/l/it-services-companies-calvados) (25)
## The same list elsewhere in France
- [Professional services firms in France](https://www.tamtam.ai/l/professional-services-firms-france) (6,611)
- [Professional services firms in Γle-de-France](https://www.tamtam.ai/l/professional-services-firms-ile-de-france) (3,377)
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- [Professional services firms in Provence-Alpes-CΓ΄te d'Azur](https://www.tamtam.ai/l/professional-services-firms-provence-alpes-cote-dazur) (433)
- [Professional services firms in the RhΓ΄ne department](https://www.tamtam.ai/l/professional-services-firms-rhone) (400)
- [Professional services firms in Occitanie](https://www.tamtam.ai/l/professional-services-firms-occitanie) (399)
- [Professional services firms in Grand Est](https://www.tamtam.ai/l/professional-services-firms-grand-est) (316)
- [Professional services firms in Nouvelle-Aquitaine](https://www.tamtam.ai/l/professional-services-firms-nouvelle-aquitaine) (308)
- [Professional services firms in Hauts-de-France](https://www.tamtam.ai/l/professional-services-firms-hauts-de-france) (260)
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- [Professional services firms in the Bouches-du-RhΓ΄ne department](https://www.tamtam.ai/l/professional-services-firms-bouches-du-rhone) (249)
- [Professional services firms in the Haute-Garonne department](https://www.tamtam.ai/l/professional-services-firms-haute-garonne) (208)
- [Professional services firms in the Nord department](https://www.tamtam.ai/l/professional-services-firms-nord) (178)
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- [Professional services firms in the Loire-Atlantique department](https://www.tamtam.ai/l/professional-services-firms-loire-atlantique) (158)
- [Professional services firms in the Gironde department](https://www.tamtam.ai/l/professional-services-firms-gironde) (151)
- [Professional services firms in Normandy](https://www.tamtam.ai/l/professional-services-firms-normandy) (114)
- [Professional services firms in the Yvelines department](https://www.tamtam.ai/l/professional-services-firms-yvelines) (108)
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- [Professional services firms in Lyon](https://www.tamtam.ai/l/professional-services-firms-lyon) (265)
- [Professional services firms in Toulouse](https://www.tamtam.ai/l/professional-services-firms-toulouse) (139)
- [Professional services firms in Marseille](https://www.tamtam.ai/l/professional-services-firms-marseille) (123)
- [Professional services firms in Boulogne-Billancourt](https://www.tamtam.ai/l/professional-services-firms-boulogne-billancourt) (102)
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Source: https://www.tamtam.ai/l/professional-services-firms-calvados