The firm was founded in 1978 as a tax and corporate law practice.

PÉTOIN & ASSOCIÉS was incorporated as a professional civil law company (société civile professionnelle) in 1983, and currently has four partners.

The main areas of activity are taxation, company and asset transfers, mergers, acquisitions and restructuring, joint ventures in the fields of telecommunications, information and communications technology, and distribution arrangements.
The firm handles commercial, tax, and employment litigation.