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Lenz & Staehelin

Work +41 58 450 80 00
Fax +41 58 450 80 01
Geneva, Lausanne, Zurich

Stephan Erni

Work +41 58 450 80 00
Lenz & Staehelin

Work Department

Corporate and M&A, Real Estate, Private Equity, Public Tender Offers, Banking and Finance, Commercial and Contracts.


Stephan Erni regularly advises clients on domestic and international transactions and on corporate and commercial matters. He specializes in real estate transactions, domestic and international M&A transactions, including public tender offers. One of the main focuses of his practice is advising private equity firms in auction processes, both buy-side and sell-side. During his practice for one of the major law firms in New York (2005/2006), he gained experience in the relevant areas in the U.S. too.


Admission to Zurich Bar (2002), Associate at Lenz & Staehelin (2002), Partner at Lenz & Staehelin (2012).


German, English, French.


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


Universities of Zurich and Fribourg (lic. iur., 1999), University of Virginia School of Law (LL.M., 2005).


Commercial, corporate and M&A

Within: Next Generation Partners

Stephan Erni - Lenz & Staehelin

Within: Commercial, corporate and M&A

Lenz & Staehelin's 'highly recommended, hands-on' team stands out for its 'very thorough levels of preparation' and 'impeccable integrity', 'combining exceptional lawyers with tremendous collegiality and client service'. Focus areas include private and public M&A, corporate governance, and private equity transactions. In a recent highlight, 'world-class M&A lawyer' Hans-Jakob Diem assisted Saudi Basic Industries with its upcoming 24.99% share capital acquisition in Clariant. Rudolf Tschäni is another key practitioner, while clients further recommend 'extraordinarily smart' Tino Gaberthüel; 'committed' Beat Kühni, who has 'an encyclopaedic knowledge'; 'clear, proactive and quick' Stephan Erni; as well as 'efficient and flexible' Geneva-based Guy Vermeil.

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Healthcare and life sciences

Within: Healthcare and life sciences

Core areas of expertise at Lenz & Staehelin include intellectual property and commercial disputes, regulatory advice, M&A and licensing transactions, as well as product liability, competition and outsourcing matters. Thierry Calame represents Mepha as the claimant in several patent nullity proceedings concerning breast cancer treatment, while Stephan Erni assisted Coltene with the acquisitions of SciClan and MicroMega. Counsel Lara Dorigo is another key practitioner.

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