Best consultancies

Brussels Office Since

Firm Description

Lysios Public Affairs advises and supports its clients in strengthening their engagement with their political, legislative, regulatory and socio-economic environment, while helping them develop their activities.

The firm provides strategic public affairs advice and designs monitoring tools and programmes to facilitate dialogue with public authorities at local, national and European level. Through its work, Lysios enables clients to convey their views to relevant decision-makers, enhance their reputation and, where appropriate, join forces with other stakeholders to promote shared interests.

Lysios Public Affairs has extensive experience working with French and European public authorities and supports clients on matters relating to policy, legislation, regulation, technology, industry and competition.

The firm was founded in Paris in 2003 and has been present in Brussels since 2007.

Ownership Structure

Lysios is an independent company owned by three partners.

International Network

Lysios has offices in Paris and Brussels and collaborates with aligned partner agencies in several other markets, covering nearly all EU Member States, the United States and many other countries. Lysios is a member of Mosaic Network, a global network of independent public affairs firms.

Key Strengths

Lysios Public Affairs stands out as a pure-player public affairs consultancy, combining senior strategic advice with a deep understanding of public decision-making processes and stakeholder dynamics.

One of the firm’s key strengths is the diversity of its team, which brings together consultants and experts with backgrounds across public institutions, the private sector, trade associations and civil society. This mix of experience allows Lysios to approach each mandate with both political insight and practical business understanding.

Recognised as one of the leading public affairs firms in the French market, Lysios also brings a strong European and international perspective. The firm is particularly valued for its ability to help clients navigate complex environments, clarify their positioning, anticipate political and regulatory developments, and build credible engagement strategies adapted to their specific challenges.

Lysios’ approach is pragmatic, tailored and results-oriented. The firm works closely with each client to define clear priorities, identify the right stakeholders and translate strategic objectives into concrete public affairs action.

Number of Public Affairs Consultants

Key Clients

Ardian, Saint-Gobain, Saverglass, Digital Asset, Fédération Française des Télécoms, Hologic, Interdigital, Open Cosmos, TDF, Tereos, Viasat, Région Pays de Loire

Testimonials and why clients like to work with us

Lysios is valued for the quality and consistency of its client relationships, which are built on trust, discretion and responsiveness. Many mandates evolve into lasting partnerships, supported by a close understanding of each client’s priorities, constraints and institutional environment.

Clients appreciate the firm’s ability to combine strategic judgement with practical execution. Each assignment is approached through a tailored methodology, designed around the client’s specific challenges, objectives and stakeholder ecosystem, with clear and actionable advice provided in often complex or sensitive public affairs contexts.

The strength of these relationships is reflected in client loyalty and in the growing number of long-term mandates. For Lysios, this continuity is the strongest endorsement of the trust placed in the firm’s work and of its ability to provide support with credibility, commitment and impact.