# SaaS companies headquartered in the Yvelines department

Tamtam tracks 49 SaaS companies headquartered in the Yvelines department. This list ranks the 30 largest by number of employees on LinkedIn, led by Dassault Systèmes, SELL and Avanteam. Their median headcount is 32. Half of them were founded in 2009 or later. The most common headquarters are Versailles (6), Velizy-Villacoublay (5) and Montigny-le-Bretonneux (3).

The SaaS companies in Yvelines are primarily software development firms, ranging from large groups to mid-sized companies, with a focus on specialized business solutions. Dassault Systèmes, with over 27,000 employees, offers a platform for sustainable innovation across industries. SELL provides a cloud platform for product information management, while Avanteam specializes in BPM and ECM solutions with AI. Coptis focuses on advanced technology for Cosmetic R&D, and Veryswing offers SaaS management software for IT services.

A notable pattern among these companies is the concentration of headquarters in specific towns. Vélizy-Villacoublay hosts Dassault Systèmes, Avanteam, FraudBuster, and Vistory. Croissy-sur-Seine is home to SELL and Coptis, while Versailles counts COSIUM and Pomelo-Paradigm among its companies. This suggests a localized cluster of technological expertise within the department.

🇫🇷 Yvelines · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Dassault Systèmes](https://www.tamtam.ai/c/dassault-systemes) (3ds.com)<br>Pioneering virtual worlds since 1981, this company offers a platform enabling customers across industries to collaborate, imagine, and create sustainable innovations for real-life impact. | Software Development | 🇫🇷 Velizy-Villacoublay | 27,414 |  |
| 2 | [SELL](https://www.tamtam.ai/c/sell) (sell-marketing.com)<br>A French independent company helps businesses master product information to optimize their sales strategy using the SELL BASE cloud platform | Software Development | 🇫🇷 Croissy-sur-Seine | 587 | 2006 |
| 3 | [Avanteam](https://www.tamtam.ai/c/avanteam) (avanteam.fr)<br>A software editor specializing in BPM and ECM solutions, using innovative technologies like AI, serving over 500 customers in Europe | Software Development | 🇫🇷 Velizy-Villacoublay | 104 | 2003 |
| 4 | [Ardans](https://www.tamtam.ai/c/ardans) (ardans.fr)<br>Ardans specializes in knowledge management solutions, offering consulting, training, information systems, and software for organizations across various industries and sectors | Business Consulting and Services | 🇫🇷 Montigny-le-Bretonneux | 69 | 1999 |
| 5 | [COSIUM](https://www.tamtam.ai/c/cosium) (cosium.com)<br>Cloud-based software and hardware solutions for healthcare industry, offering ICT outsourcing, Business Intelligence tools, and custom-designed electronics for optical retail and domiciliary care | Software Development | 🇫🇷 Versailles | 65 | 2003 |
| 6 | [Coptis](https://www.tamtam.ai/c/coptis) (coptis.com)<br>A company specializing in advanced technology solutions for Cosmetic R&D, offering software for product development, compliance management, and toxicology information | Software Development | 🇫🇷 Croissy-sur-Seine | 58 | 1999 |
| 7 | [Pomelo-Paradigm](https://www.tamtam.ai/c/pomelo-paradigm) (pomelo-paradigm.com)<br>An innovative company designing collaborative applications with simple tools to enhance human productivity across all media platforms | Software Development | 🇫🇷 Versailles | 47 | 2013 |
| 8 | [Hesion](https://www.tamtam.ai/c/hesion) (hesion.fr)<br>Hesion digitizes parking management systems to simplify complexity, offers plug-and-play solutions with real-time decision support, and provides expertise in operation and maintenance | Internet Publishing | 🇫🇷 Achères | 46 | 1975 |
| 9 | [Allshare](https://www.tamtam.ai/c/allshare-guyancourt) (allshare.fr)<br>Helps HR, C&B, and Finance teams align workforce with company strategy and build compensation policies to attract, retain, and engage employees. | Software Development | 🇫🇷 Guyancourt | 46 | 1992 |
| 10 | [PHOENIX FLEET EXPERT](https://www.tamtam.ai/c/phoenix-fleet-expert) (phoenix-fleetexpert.com)<br>PHOENIX FLEET EXPERT offers fleet management solutions including outsourcing, software, and shared management to optimize clients' vehicle fleets effectively | Software Development | 🇫🇷 Méré | 45 | 2011 |
| 11 | [FraudBuster](https://www.tamtam.ai/c/fraudbuster) (fraudbuster.mobi)<br>Antifraud services for mobile network operators worldwide with disruptive approach and unique solutions like SIMBuster, and MoMoSe. | Telecommunications | 🇫🇷 Velizy-Villacoublay | 39 | 2010 |
| 12 | [Vistory](https://www.tamtam.ai/c/vistory) (vistory.com)<br>Development of cybersecurity software leveraging blockchain, cloud, and big data technologies to enable digital transformation and industry disruption. | Program Development | 🇫🇷 Velizy-Villacoublay | 38 | 2015 |
| 13 | [Veryswing](https://www.tamtam.ai/c/veryswing) (veryswing.com)<br>French editor providing SaaS management software for IT services, consulting firms, design offices, and umbrella companies, ensuring high security and regulatory compliance. | Software Development | 🇫🇷 Versailles | 36 | 2012 |
| 14 | [Comercea](https://www.tamtam.ai/c/comercea) (comercea.fr)<br>Digital platform boosting city centers & local shops, promoting in-store purchases through loyalty programs, sales promotions, gift vouchers, and online options for convenience | Technology, Information and Internet | 🇫🇷 Montesson | 34 | 2014 |
| 15 | [MédiFirst](https://www.tamtam.ai/c/medifirst) (medifirst.com)<br>Dedicated to serving medical professionals in Assisted Reproduction (ART) and Genetics, the company provides an EMR system to streamline patient journeys and boost operational efficiency. | Software Development | 🇫🇷 Montigny-le-Bretonneux | 32 | 2002 |
| 16 | [ULiT](https://www.tamtam.ai/c/ulit) (usersloveit.com)<br>A software publisher offering a cloud-based platform, negOptim, for cost-effective data exchanges, business processes, and collaboration between suppliers and retailers | IT Services and IT Consulting | 🇫🇷 Le Port-Marly | 29 | 2015 |
| 17 | [INOVATIC](https://www.tamtam.ai/c/inovatic) (inovatic.fr)<br>French specialist in automated data extraction from structured documents for businesses, focusing on financial industry professionals, optimizing client journeys for online financing offers. | IT Services and IT Consulting | 🇫🇷 Montigny-le-Bretonneux | 25 | 2000 |
| 18 | [MonEcho - logiciel médical](https://www.tamtam.ai/c/monecho-vidal-group) (monecho.com)<br>Provides an online software solution for ultrasound practitioners and hospitals, integrating with all ultrasound machines and ensuring data security and efficient workflow. | Software Development | 🇫🇷 Plaisir | 25 | 2009 |
| 19 | [EVOGEST LOGEST](https://www.tamtam.ai/c/evogest-logest) (evogest.fr)<br>EVOGEST is your partner for integrated ERP solutions and computer hardware in Orgeval, France, specializing in business management and IT equipment | Software Development | 🇫🇷 Orgeval | 24 | 2007 |
| 20 | [MAIDIS SAS](https://www.tamtam.ai/c/maidis-sas) (maidis.fr)<br>Development and marketing of comprehensive electronic health record software for medical and dental practices, hospitals, and health centers. | Software Development | 🇫🇷 Chatou | 19 | 2003 |
| 21 | [Gestimum](https://www.tamtam.ai/c/gestimum) (gestimum.com)<br>Manufacturer of user-friendly ERP software, Gestimum, tailored for 20-500 employee companies Constantly updates with new features and offers related services | Software Development | 🇫🇷 Rambouillet | 19 | 2004 |
| 22 | [KERLOG](https://www.tamtam.ai/c/kerlog) (kerlog.com)<br>Software publisher specializing in waste management for environmental and recycling industries, serving over 350 clients with 4,000+ users across France and overseas territories | Software Development | 🇫🇷 Le Pecq | 19 | 2003 |
| 23 | [LINKVIEW](https://www.tamtam.ai/c/linkview) (linkview.fr)<br>Provider of connected security solutions, utilizing patented technology for remote access supervision Specializing in monitoring, repairing, and servicing access installations for doors, gates, barriers, and parking systems | Computer and Network Security | 🇫🇷 Le Pecq | 18 | 2018 |
| 24 | [TomTom Telematics France](https://www.tamtam.ai/c/tomtom-telematics-france) (tomtom.com)<br>A leading international telematics solutions provider, offering fleet management, vehicle performance optimization, fuel savings, and driver support services to businesses worldwide | IT Services and IT Consulting | 🇫🇷 Noisy-le-Roi | 17 |  |
| 25 | [A-Systems SAS](https://www.tamtam.ai/c/a-systems-sas) (a-systems.com)<br>Develops and sells advanced feed formulation software, Allix, for the animal feed industry, offering features like optimization, ration calculation, and quality control. | Software Development | 🇫🇷 Versailles | 17 | 2001 |
| 26 | [Kiwee.care](https://www.tamtam.ai/c/kiwee-care) (kiwee.care)<br>Simplifies healthcare payments and administrative processes, supports patients and professionals with an intuitive, secure digital solution and attentive service. | Hospitals and Health Care | 🇫🇷 Chatou | 17 | 2021 |
| 27 | [Wakanda.io](https://www.tamtam.ai/c/wakanda-io) (us.4d.com)<br>Revolutionizing development with an open-source JavaScript platform for building and maintaining mobile and web applications quickly and effectively | Software Development | 🇫🇷 Le Pecq | 15 | 2014 |
| 28 | [Intuitem](https://www.tamtam.ai/c/intuitem) (intuitem.com)<br>Company creates cybersecurity software, focusing on governance, risk management, and compliance, using expertise in cloud, data, and AI to help organizations manage cyber challenges. | IT Services and IT Consulting | 🇫🇷 Velizy-Villacoublay | 14 | 2018 |
| 29 | [Entropy](https://www.tamtam.ai/c/entropy-versailles) (entropy.fr)<br>Develops predictive and decision-making AI models, aiding businesses and territories in piloting activities, including multimodal mobility observation and anticipating point of interest footfall. | IT Services and IT Consulting | 🇫🇷 Versailles | 13 | 2019 |
| 30 | [LIAISON VOCALE](https://www.tamtam.ai/c/liaison-vocale)<br>Develops and sells specialized CRM software for voice interactions, offering virtual voice-activated switchboards, biometric voice authentication, and intelligent conversational agents. | Software Development | 🇫🇷 Versailles | 12 | 2013 |

## 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 Yvelines department

- [The largest companies in the Yvelines department](https://www.tamtam.ai/l/largest-companies-yvelines) (1,469)
- [Multinational companies in the Yvelines department](https://www.tamtam.ai/l/multinational-companies-yvelines) (226)
- [Companies with in-house R&D in the Yvelines department](https://www.tamtam.ai/l/r-and-d-companies-yvelines) (160)
- [IT services companies in the Yvelines department](https://www.tamtam.ai/l/it-services-companies-yvelines) (121)
- [IT Services and IT Consulting companies in the Yvelines department](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-yvelines) (118)
- [Manufacturers in the Yvelines department](https://www.tamtam.ai/l/manufacturers-yvelines) (109)
- [Professional services firms in the Yvelines department](https://www.tamtam.ai/l/professional-services-firms-yvelines) (108)
- [Hardware manufacturers in the Yvelines department](https://www.tamtam.ai/l/hardware-companies-yvelines) (106)
- [Distributors and wholesalers in the Yvelines department](https://www.tamtam.ai/l/distributors-and-wholesalers-yvelines) (91)
- [Retail chains in the Yvelines department](https://www.tamtam.ai/l/retail-chains-yvelines) (89)
- [Consulting firms in the Yvelines department](https://www.tamtam.ai/l/consulting-firms-yvelines) (72)
- [Aerospace and defence companies in the Yvelines department](https://www.tamtam.ai/l/aerospace-and-defense-companies-yvelines) (65)
- [Public sector organisations in the Yvelines department](https://www.tamtam.ai/l/public-sector-organisations-yvelines) (65)
- [Software Development companies in the Yvelines department](https://www.tamtam.ai/l/software-development-companies-yvelines) (56)
- [Business Consulting and Services companies in the Yvelines department](https://www.tamtam.ai/l/business-consulting-and-services-companies-yvelines) (53)
- [Government Administration companies in the Yvelines department](https://www.tamtam.ai/l/government-administration-companies-yvelines) (51)
- [Construction companies in the Yvelines department](https://www.tamtam.ai/l/construction-companies-yvelines) (50)
- [Automotive manufacturers and suppliers in the Yvelines department](https://www.tamtam.ai/l/automotive-companies-yvelines) (49)
- [Motor Vehicle Manufacturing companies in the Yvelines department](https://www.tamtam.ai/l/motor-vehicle-manufacturing-companies-yvelines) (49)
- [Education providers in the Yvelines department](https://www.tamtam.ai/l/education-companies-yvelines) (46)
- [Industrial Machinery Manufacturing companies in the Yvelines department](https://www.tamtam.ai/l/industrial-machinery-manufacturing-companies-yvelines) (43)
- [Critical infrastructure operators in the Yvelines department](https://www.tamtam.ai/l/critical-infrastructure-operators-yvelines) (41)
- [Family-owned companies in the Yvelines department](https://www.tamtam.ai/l/family-owned-companies-yvelines) (36)
- [Environmental services companies in the Yvelines department](https://www.tamtam.ai/l/environmental-services-companies-yvelines) (35)

## The same list elsewhere in France

- [SaaS companies in Île-de-France](https://www.tamtam.ai/l/saas-companies-ile-de-france) (2,859)
- [SaaS companies in Auvergne-Rhône-Alpes](https://www.tamtam.ai/l/saas-companies-auvergne-rhone-alpes) (476)
- [SaaS companies in the Hauts-de-Seine department](https://www.tamtam.ai/l/saas-companies-hauts-de-seine) (389)
- [SaaS companies in Occitanie](https://www.tamtam.ai/l/saas-companies-occitanie) (317)
- [SaaS companies in Provence-Alpes-Côte d'Azur](https://www.tamtam.ai/l/saas-companies-provence-alpes-cote-dazur) (285)
- [SaaS companies in the Rhône department](https://www.tamtam.ai/l/saas-companies-rhone) (284)
- [SaaS companies in Nouvelle-Aquitaine](https://www.tamtam.ai/l/saas-companies-nouvelle-aquitaine) (236)
- [SaaS companies in Grand Est](https://www.tamtam.ai/l/saas-companies-grand-est) (216)
- [SaaS companies in Hauts-de-France](https://www.tamtam.ai/l/saas-companies-hauts-de-france) (194)
- [SaaS companies in Pays de la Loire](https://www.tamtam.ai/l/saas-companies-pays-de-la-loire) (180)
- [SaaS companies in the Nord department](https://www.tamtam.ai/l/saas-companies-nord) (163)
- [SaaS companies in the Haute-Garonne department](https://www.tamtam.ai/l/saas-companies-haute-garonne) (147)
- [SaaS companies in the Bouches-du-Rhône department](https://www.tamtam.ai/l/saas-companies-bouches-du-rhone) (146)
- [SaaS companies in the Gironde department](https://www.tamtam.ai/l/saas-companies-gironde) (141)
- [SaaS companies in the Loire-Atlantique department](https://www.tamtam.ai/l/saas-companies-loire-atlantique) (135)
- [SaaS companies in Brittany](https://www.tamtam.ai/l/saas-companies-brittany) (128)
- [SaaS companies in the Hérault department](https://www.tamtam.ai/l/saas-companies-herault) (110)
- [SaaS companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/saas-companies-ille-et-vilaine) (85)
- [SaaS companies in Paris](https://www.tamtam.ai/l/saas-companies-paris) (2,218)
- [SaaS companies in Lyon](https://www.tamtam.ai/l/saas-companies-lyon) (211)
- [SaaS companies in Lille](https://www.tamtam.ai/l/saas-companies-lille) (104)
- [SaaS companies in Toulouse](https://www.tamtam.ai/l/saas-companies-toulouse) (102)
- [SaaS companies in Nantes](https://www.tamtam.ai/l/saas-companies-nantes) (90)
- [SaaS companies in Bordeaux](https://www.tamtam.ai/l/saas-companies-bordeaux) (88)

---

Source: https://www.tamtam.ai/l/saas-companies-yvelines