Thomas Gysin becomes partner at act legal Switzerland

Thomas Gysin has been appointed partner, effective 1 July 2026. His professional strength, commitment and negotiation skills reflect the values that define act legal Switzerland.

Thomas Gysin (attorney-at-law, MLaw) has been with act legal Switzerland (formerly BGPartner Ltd) since 2020. During this time, he advanced from associate to senior associate to managing associate, taking on increasing responsibility for complex national and international matters. He is specialised in negotiation, national and international contract law, as well as corporate, commercial and capital markets law, including M&A, private equity and venture capital. Before moving into private practice, he gained over ten years of experience in legal and commercial roles at leading national and international companies.

Thomas Gysin has been involved in numerous landmark transactions. Most recently, he advised Araris Biotech on its full acquisition by Japan's Taiho Pharmaceutical, a transaction with a total value of up to USD 1.1 billion. He also advised on strategic investments in the biotech sector, the greeting-card segment acquisition by GOLDBEK Holding, and international M&A transactions in the technology and services sectors.

Thomas Gysin has demonstrated his particular strength at the negotiating table. In 2024, together with his colleague Tessa Douma, he won the world championship title at The Negotiation Challenge. This combination of strategic thinking, clear focus and team spirit shapes his daily work for our clients.

We warmly congratulate Thomas on this step and look forward to working with him as a partner.