Gian Riz à Porta Associate
Attorney at Law

Gian Riz à Porta
Associate
Attorney at Law
+41 58 450 80 00
gian.rizaporta@lenzstaehelin.com 		Zurich
Brandschenkestrasse 24
CH-8027 Zurich
www.lenzstaehelin.com

  • Expertise

    Gian Riz à Porta is a member of Lenz & Staehelin’s Dispute Resolution group in Zurich and represents clients in international arbitrations as well as before Swiss courts. His prior experience covers a wide range of industries and areas of law, including commercial, M&A, construction and energy related disputes. Gian also sits as arbitrator.

  • Practices

    Investigations Litigation and Arbitration Real Estate

  • Specialist Areas

    International and Domestic Litigation and Arbitration, International Private Law, Internal Investigations

  • Professional Experience and Education

    and Education

    2020Associate, Lenz & Staehelin
    2018Law clerk, Cantonal Court of Basel-Landschaft
    2019Swiss Bar Admission
    2016University of Basel (MLaw)
    2015-16Université Paris II Panthéon-Assas
    2014University of Basel (BLaw)

  • Languages

    German, English, French, Italian

  • Memberships

    Zurich Bar Association (ZAV), Swiss Bar Association (SAV)

  • Selected Publications

    • Frey H., Rötheli A., Favre-Bulle X., Riz à Porta G., The Mergers and Acquisitions Litigation Review - Switzerland, in: The Law Reviews, 1st edition, December 2020, 120-128

  • Contact details

    Zurich gian.rizaporta@lenzstaehelin.com
    V-Card Full CV

Publications

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Insights

Insights – 23.04.2026

Swiss Federal Supreme Court holds Swiss Russia sanctions are overriding mandatory law and can bar enforcement of arbitral awards

Swiss Federal Supreme Court holds Swiss Russia sanctions are overriding…

<p>In decision 4A_305/2025 of 13 March 2026, the Swiss Federal Supreme Court held that Swiss sanctions against Russia are overriding mandatory law and apply irrespective of the otherwise applicable law. The Court reasoned that the Swiss Ukraine Ordinance serves Switzerland’s core foreign-policy objectives and therefore applies as overriding mandatory law. In this case, the Court held that the sanctions barred enforcement of the award in Switzerland and treated the claim as unenforceable while the sanctions remain in force.</p>

Insights – 01.07.2025

New bespoke rules for private clients arbitration: the 2025 Supplemental Swiss Rules for Trust, Estate and Foundation Disputes

New bespoke rules for private clients arbitration: the 2025 Supplemental…

As of 1 July 2025, the Swiss Arbitration Centre offers a new framework for increased efficiency in private client arbitration proceedings, with the entry into force of the Supplemental Swiss Rules for Trust, Estate and Foundation Disputes ("TEF Rules"). The TEF Rules are a tailor-made supplement to the existing Swiss Rules of International Arbitration ("Swiss Rules"), which aim to cater to the specific requirements of inheritance disputes, as well as internal disputes arising in connection with trusts and foundations.
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