About us

Actheos was founded in 2007 by a group of entrepreneurs, following the alliance of three renowned, venerable firms in Paris and North-Western France.

  • ACTHEOS Genuyt & Associés (Paris)
  • ACTHEOS Basse Seine Expertise Comptable (Rouen, Le Havre)
  • ACTHEOS Rouxel-Tanguy & Associés (Rennes, Saint-Brieuc)

Actheos provides a competitive and complementary alternative to major accounting and auditing networks, using an approach that combines firepower in Paris and geographic proximity in North-Western France.


Our teams

  • About 100 employees
  • Twelve Associate Partners
  • 11 Chartered Accountants and Certified Financial Services Auditors
  • An Associate Partner assigned to every mission


Our assets

  • Multiple disciplines
  • Flexibility and bespoke solutions
  • Stable teams
  • Proximity and quality customer relations


Our customers

We work with 1,300 customers:

  • French groups and multinationals
  • Foreign group subsidiaries
  • SMEs/SMIs
  • Freelancers
  • Players in the social and solidarity-based economy