Andrea Sieber, lic. iur. HSG, LL.M.
Andrea Sieber, lic. iur. HSG, LL.M.

Andrea Sieber, lic. iur. HSG, LL.M.

Partner, Zurich

Schiffbaustrasse 2 | P.O. Box | CH-8031 Zurich | Switzerland
Schiffbaustrasse 2 | P.O. Box | CH-8031 Zurich | Switzerland
T +41 58 552 01 60


Andrea Sieber specialises in national and cross-border M&A, distressed M&A transactions, private equity and capital market transactions as well as national and international company restructurings and reorganisations. She also advises Swiss and international clients on corporate governance questions, shareholder disputes and general corporate law. Her clients include several listed companies, large and medium-sized private companies, private equity and venture capital funds, family offices as well as private and institutional investors. She has a particular industry focus on regulated industries (such as financial services and health care) as well as on the entertainment, retail and luxury industry.

Her extensive experience in distressed M&A transactions extends to representing buyers of shares or assets of financially distressed entities as well as to advising shareholders, board of directors and management of companies in financial distress with regard to the sale of shares or major assets, including the special requirements, issues and pitfalls related to these transactions. Further, she provides support to the board of directors and the management in negotiations between the financially-distressed entity and its major suppliers, customers, employees’ representatives, lenders, bondholders and other stakeholders. She works closely with financial advisors, investment banks and investors to develop restructuring proposals, carve-out and pre-packaging options as well as negotiate and implement these transaction steps.

Rankings & Awards

Chambers and Partners Global Andrea Sieber 2024IFLR 1000 Highly Regarded Leading Lawyers 2023Best Lawyers Andrea Sieber 2024Legal 500 EMEA Recommended Lawyer 2023Chambers and Partners Europe Andrea Sieber 2023Chambers and Partners Global Andrea Sieber 2023Best Lawyers Recognized in 2023Chambers and Partners Global 2022 Andrea SieberChambers and Partners Europe 2022 Andrea SieberLegal 500 EMEA Recommended Lawyer 2022IFLR 1000 Highly Regarded Leading Lawyers 2022 IFLR 1000 Highly Regarded 31st edition Best Lawyers Recognized in 2022Chambers and Partners Global 2021 Andrea SieberChambers and Partners Europe 2021 Andrea SieberLegal 500 EMEA Recommended Lawyer 2021Chambers and Partners Global 2020 Andrea SieberChambers and Partners Europe 2020 Andrea SieberLegal 500 EMEA Recommended Lawyer 2020Legal 500 EMEA Recommended Lawyer 2019Legal 500 EMEA Recommended Lawyer 2018
  • “The work was always carried out with high accuracy, and also the commercial framework side was always respected” – Chambers and Partners Global, Corporate and M&A, 2024
  • “The lawyers at MLL Legal understand the clients’ needs and give tailored advice with respect to commercial topics” – Chambers and Partners Global, Corporate and M&A, 2024
  • “Andrea Sieber is really quite pragmatic, which we really like. She talks a language you understand and gets straight to the point” – Chambers and Partners Global, Corporate and M&A, 2023
  • Andrea Sieber is noted for her experience assisting with cross-border mergers and acquisitions. She is lauded by clients as “super responsive, committed and sharp-minded” and receives praise for her “outstanding legal expertise and ability to handle complex deals” – Chambers and Partners Europe & Global, Corporate and M&A, 2022
  • “Andrea Sieber: no-nonsense approach, understands risk management and takes a business approach to legal contracting; wants to close deals and pushes hard; very effective, clear opinions. Highly recommendable” – Legal 500 EMEA, Commercial, Corporate and M&A, 2022
  • “Andrea Sieber is a very competent lawyer with a wide range of legal experience who always supports us in terms of both content and time to our complete satisfaction” – IFLR 1000, 2021-22
  • “Strong client focus and always delivering high quality of work. Always reachable and thorough understanding of client’s needs” – IFLR 1000, 2021-22
  • “Responsiveness, accessibility, deep commercial understanding and view; puts herself in her clients’ shoes” – IFLR 1000, 2021-22
  • Andrea Sieber is “very dedicated and available at any time” – Legal 500 EMEA, 2020
  • Sources highlight her ability in transactions, describing her as “tremendously focused on deal making” and praising her “strong communication skills”Chambers and Partners, Corporate and M&A, 2020
  • Andrea Sieber is “highly deal-oriented” and “able to deliver excellent results under pressure” – Legal 500 EMEA, Commercial, Corporate and M&A, 2020
  • Described by interviewees as “reliable and very fast”, Andrea Sieber is further noted for her “very profound preparation and analysis”. She acted on the divestment and sale of Meyer Burger Technology’s diamond wire production business to Thermocompact. She also assists clients with public tender offers and shareholder agreements – Chambers and Partners Europe, Corporate and M&A, 2020

Deals & Cases

  • MLL Legal advised SKP Investments SICAV, Teilfond MW Storage Fund with regard to its investment as an anchor investor into a 200 MWh battery storage power plant in Arzberg, Germany. A joint project of MW Storage Fund together with Reichmuth & Co Infrastructure, as majority shareholder, and Bayernwerk AG and Zukunftsenergie Nordostbayern GmbH.
    The battery storage power plant in Arzberg/Germany has a connection capacity of 100 MWh and a storage capacity of 200 MWh. This makes it one of the largest installations currently planned in Germany. With the construction of the plant in Arzberg, the project partners are financing an important infrastructure for the energy transition, as the realisation of the energy transition requires not only the expansion of renewable energies but also a significant expansion of storage capacities. The entire battery storage power plant is expected to be completed and operational by early 2025.
  • Advised the owners of cargopack group ag with regard to the sale of the company and its subsidiaries to Nefab AB, Sweden
  • Advised Crest Rock Partners, a Denver-based private equity fund, on a transaction that led to a strategic growth investment in Pitcher AG
  • Advised Swiss KMU Partners AG and SIC Group AG with regard to its investment in Sauter, Bachmann AG, a company engaged in developing and producing high-precision gears and gearboxes for Swiss and international clients in the aerospace and industrial segment
  • Advised 3 private sellers in M&A transaction regarding the sale of Elpro Group to Bosch
  • Advised ZBG Capital N.V. in the subscription of a CHF 30 million corporate bond issued by Peach Property Group AG, a Swiss listed company
  • Advised Shinsegae International, South-Korea, in its acquisition of a group of Swiss based companies active in the luxury cosmetic industry
  • Representing Calida Holding AG, a publicly listed company, on an ongoing basis with regard to strategic M&A projects, acquisition financing of such M&A activities, negotiations of syndicated bank loans, with regard to listing requirements, general corporate matters and corporate governance aspects
  • Representation of WEPA SE, Germany, a family business operating throughout Europe which offers sustainable and innovative hygiene solutions, who is one of the largest European manufacturers and leads the market in the production of hygiene paper from recycled fibres with regard to its M&A activities in DACH region. MLL supported WEPA with regard to the due diligence process, the preparation and negotiations of transaction agreements (such as share purchase agreements, transitional services agreement, manufacturing agreement), the analysis of merger control filing obligations and the preparation of filings under special national real estate provisions
  • Representing Meyer Burger Switzerland AG and its foreign affiliates with regard to the carve-out of the wafering business and the corresponding sale of the wafering business to Precision Surfacing Solutions and its local affiliates in the course of a share and asset sale transaction
  • Representing a US based company with regard to its acquisition of a Swiss company engaging in the development and licensing of software for dental and related oral health-related practices, by way of a share purchase transaction
  • Representing a venture capital fund with regard to its investment in a Swiss company’s latest financing round. The target company was active in the field of developing intelligent mobility operating systems
  • Representing a Swiss private individual with regard to a sell-side transaction regarding the sale of several Swiss holding companies and their 8 operating Swiss subsidiaries, all active in the healthcare sector, to a private equity fund
  • Representing Peter and Patrick Schaumlechner with regard to the sale of a majority interest in Impuls Media Group AG and its subsidiaries, active in the film marketing business, to CH Media Holding AG by way of a share purchase transaction
  • Representing Meyer Burger Technology AG in its comprehensive financial recapitalization program, to which the amendments of the terms of the convertible bonds in a bondholder meeting, a capital increase by way of a rights offering, and the extension and amendments of bank credit facilities were necessary
  • Representation of Calida Holding AG in its strategic acquisition of Reich Online Services GmbH, Germany, from a private individual. The target company is active in the online distribution of underwear and nightwear
  • Representation of H.I.G Capital, a private equity fund, in the acquisition of a majority stake in the share capital of Infinigate Holding AG, a leading European value added distributor in the IT security segment, and the subsequent squeeze-out merger

Education & Admission

  • University of California, Davis, School of Law, LL.M. (2007)
  • Admitted to the bar in Switzerland (2003)
  • University of St. Gallen (HSG), lic. iur. (2001)

Memberships and public offices

  • International Bar Association (IBA)
  • Swiss Private Equity & Corporate Finance Association (SECA)
  • MLL Counsel Forum (MLL CF)
  • Zurich Bar Association (ZAV)


  • German
  • English


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Firm News

Andrea Sieber is “very dedicated and available at any time”

Legal 500 EMEA, 2020