Martin L. Müller

Partner Mark Cagienard specialises in tax law, covering individual and corporate taxation both on a domestic and international level with a particular focus on corporate finance, M&A and VAT. Mark Cagienard assists clients frequently in obtaining tax rulings and represents them in front of courts and tax authorities. Mark Cagienard graduated from the University of Zurich in 2006 (magna cum laude) and was admitted to the bar in 2008. In 2012 he qualified as a Swiss Certified Tax Expert. In...

David Vasella is a partner on the Information Technology, Intellectual Property and Competition team. He is the co-head of the Regulated Markets, Competition, Technology & IP team, together with Hans Rudolf Trüeb. He advises and represents Swiss and international companies in all industries and at all stages of growth on questions concerning data and technology law. He specialises in data use, negotiating data-related contracts, data security issues, cloud projects and IT contracts a...

Partner Certified Specialist SBA Construction and Real Estate Law Sibylle Schnyder specialises in real estate law and mainly deals with real estate acquisitions and divestments, portfolio transactions, construction and development projects, landlord and tenant law, real estate financing, sale & rent back transactions and real estate related litigation. Among the clients of Sibylle Schnyder are Swiss and foreign institutional real estate investors, companies with corporate real estate matt...

Urs P. Gnos heads the Transaction Team. His practice focuses on international and domestic mergers & acquisitions, private equity, venture capital and capital market transactions, commercial and corporate law as well as public tender offers and buy-outs. Urs P. Gnos also advises companies with respect to corporate governance matters, stock exchange regulations, corporate reorganizations and restructurings, incl. relocations. Urs P. Gnos is a member of various board of directors, among oth...

Kinga M. Weiss is a partner and co-chair of the Private Clients team of Walder Wyss. She primarily devotes her time to domestic and foreign private clients, banks and family offices. Her areas of expertise are centered around both private clients and entrepreneurs in matters of inheritance law, including marital property law, relating to estate planning, business succession and execution of wills. Cross-border cases account for the bulk of her field of action. Besides, she also supports clien...

Partner & Member of the Steering Committee of the CMS Competition & EU Group Marquard Christen specializes in competition (antitrust) and public procurement law. Marquard advises Swiss and foreign companies on all aspects of Swiss and EU competition law (horizontal and vertical agreements, dominance abuse, merger control and civil antitrust law) and represents them in proceedings before competition authorities and courts. Over the past 15 years, he has gained special knowledge in vari...

Partner Dr Patrick Sommer is Co-Head of the CMS Competition & EU Group. In this position, he jointly leads an international team of more than 170 competition lawyers. Patrick Sommer focuses on competition law, corporate law and M&A. Patrick Sommer has graduated from the University of St.Gallen in 1987 and was admitted to the bar in 1989. He has written his doctoral thesis on the relationship of Switzerland to the European Union and completed postgraduate studies at the Collège ...

Irène Suter-Sieber is a top attorney recognized by Best Lawyers in the practice area(s) of Labor and Employment Law. Irène, who practices law in Zürich, Switzerland, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Irène is held by other top lawyers in the same geographic and legal practice area.

Lukas Wyss is a partner in the Banking & Finance Team. He advises banks, insurers and other companies in connection with finance transactions, capital market transactions and more generally in regulatory, securities and corporate law matters. In finance, he focuses on corporate debt finance, leveraged finance, asset finance (including real estate finance), acquisition finance and structured finance and securitisation. Born in 1975, Lukas Wyss was educated at Zurich University and Lausanne...

Reto Arpagaus supports Swiss and international companies, entrepreneurs and private individuals in drafting and reviewing contracts as well as with corporate transactions, and he advises his clients in matters of intellectual property and competition law. Reto Arpagaus represents clients before state courts and courts of arbitration. He has extensive experience and specialist knowledge, in particular in the areas of financial services, industry, telecommunications, IT and the sports sector. R...