Mr Hans-Jakob Diem > Lenz & Staehelin > Zurich, Switzerland > Lawyer Profile

Lenz & Staehelin

Work Department

Corporate and Mergers & Acquisitions, Capital Markets, Corporate Governance, Banking and Finance


Partner, Head of Corporate and M&A, Co-Head of Capital Markets


Admission to Basel Bar (1995), Joined Lenz & Staehelin (1998), Partner at Lenz & Staehelin (2007)


German, English, French


Zurich Bar Association (ZAV), Swiss Bar Association (SAV), International Bar Association (IBA), Swiss Private Equity & Corporate Finance Association (SECA), Swiss-American Chamber of Commerce, Swiss-Chinese Chamber of Commerce (SCCC), Swiss Institute of Directors, Swiss LSE Alumni Association


University of Basel (lic. iur., 1992), London School of Economics and Political Science (LL.M., 1998)

Lawyer Rankings

Switzerland > Commercial, corporate and M&A

(Leading individuals)

Hans-Jakob DiemLenz & Staehelin

Lenz & Staehelin fields a ‘very efficient and very deal focused’ team, with a strong reputation in public takeovers, private transactions, private equity and venture capital as well as corporate governance. The department has broad sector coverage, with areas of expertise including financial services, chemical, life sciences, and TMT. The Zurich based Tino Gaberthüel co-leads the department with Andreas Rötheli, who heads the Geneva office. Matthias Wolf specialises in private equity transactions and the banking and financial sector, while Jacques Iffland is a key contact for capital markets. Also key are Hans-Jakob Diem, whose focus is public and cross-border M&A transactions, and Simone Ehrsam, who made partner in January 2022.

Switzerland > Capital markets

Lenz & Staehelin acts on all aspects of capital markets law at a national and international level, with a diverse client list which includes domestic and foreign banks and issuers, as well as ETC and ETF promoters. The department has significant expertise in equity offerings including IPOs, share buybacks, and rights offerings. Securities regulations expert Jacques Iffland leads the Geneva office, working alongside Zurich-based co-heads Patrick Schleiffer and Hans-Jakob Diem. Other core team members include the highly experienced François Rayroux, and financing expert Marcel Tranchet. Senior associate Patrick Schärli is also key practitioner.