About us - Oresys

Our identity

Founded in 1981 as an independent consulting firm, Oresys is a major player in transformation, organization and information systems consulting.

With a recognized multi-sectorial and multi-specialist expertise, Oresys supports CAC40 as well as intermediate-sized companies, throughout France and Switzerland via our regional offices, and internationally on your projects for:

Transformation
Organization and processes 
Managerial transformation

As the first ISO 9001-certified consulting firm since 1995, we are committed to a continuous improvement approach to meet our customers’ expectations and ensure the quality of our services.

Committed to the fulfillment and well-being of its consultants, Oresys also has a staff turnover rate twice inferior to the other consulting firms on the market.

Key figures

65 M€

turnover in 2023

370

consultants

agencies in France and Switzerland

110

customers every year

650

missions per year

Our locations

Oresys Paris

48 rue de Londres – 75008 Paris
Oresys Switzerland

36 Avenue Mon-Repos – 1005 Lausanne Suisse
Oresys Lille

28 place de la gare – 59800 Lille
Oresys Lyon

254 cours Lafayette – 69003 Lyon
Oresys Marseille

112 Boulevard des Dames – 13002 Marseille
Oresys Nantes

1 Rue du Guesclin – 44000 Nantes
Oresys Toulouse

61 Chemin de Lapujade – 31200 Toulouse
Oresys Strasbourg

10 place Gutenberg – 67081 Strasbourg

Oresys & Cordence : Get ahead of what’s next!

In 2005, Oresys created Cordence Worldwide to support its customers abroad.
Today, Cordence is a network of 8 members, 3,500 consultants in 22 countries, sharing the same high standards of quality and commitment to their customers.

Access a global network of experts

Prepare for your future through cross-border innovation

Benchmark best practices on an international scale

Support you locally in your transformations

Oresys’ commitment to people

Oresys’s CSR policy is aligned with the 10 major principles of the United Nations Global Compact and reflects the values promoted by Oresys. Our approach is constantly evolving, thanks to the initiatives of committed volunteer consultants who are working to improve Oresys’s CSR involvement.