ST SEBASTIEN SUR LOIRE, France · Europe
ADSI Ouest is the Saint-Sébastien-sur-Loire entity of ADSI PME, a French Sage X3 integrator headquartered near Nantes with offices in Paris, Rennes, Tours, Lorient, and Nantes. The firm is a Sage Business Partner Platinum for Sage X3 since 2005 and joined Parthena Consultant in September 2025.
Partner Level
Authorized
Sage certified
Company Size
Mid-Market
51–500 employees
Region
Europe
France
Sage Products
1
specialisations
ADSI Ouest is the Saint-Sébastien-sur-Loire entity of ADSI PME, a French Sage X3 integrator headquartered near Nantes with offices in Paris, Rennes, Tours, Lorient, and Nantes. The firm is a Sage Business Partner Platinum for Sage X3 since 2005 and joined Parthena Consultant in September 2025.
ADSI OUEST is a Sage Authorized Partner based in ST SEBASTIEN SUR LOIRE, France, serving clients across the Europe region. They specialise in Sage 100.
ADSI Ouest, registered in Saint-Sébastien-sur-Loire near Nantes, is the western-region entity of ADSI PME, a French Sage X3 integrator and software publisher. ADSI Ouest was incorporated in October 2012 and operates within the broader ADSI organization, which now trades as ADSI by Parthena Consultant after joining the Parthena Consultant group in September 2025. The firm has been active in the Sage X3 ecosystem since 2005 and is certified as a Sage Business Partner Platinum, the top tier of the Sage France partner program, and is a founding member of the Top League SAGE PME, an elite group of approximately 40 of the highest-performing Sage resellers and integrators in France. Beyond integration services, ADSI is also recognized as an editor of specialized solutions on top of Sage X3, with a focus on mobility and e-commerce extensions for mid-market customers. The team is distributed across Paris, Rennes, Tours, Lorient, and Nantes, providing French-language Sage X3 implementation, support, and complementary product development for SMEs and mid-market companies. ADSI also operates an internal training entity, ADSI Academy, focused on Sage X3 and related technologies.
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