Pier-Olivier Poisson's practice focuses on all aspects of corporate and commercial law, with particular emphasis on mergers and acquisitions, securities and regulatory matters applicable to financial institutions. He also advises financial institutions and market intermediaries on applicable regulatory issues, including distribution and financial services, insurance and banking. He is also interested in the framework applicable to new technologies and their application to the financial sector.

He has acted for insurers in major transactions and regularly advises financial institutions on the evolution of the regulatory framework applicable to financial services.