Oliver Sieg

Rechtsanwalt (Lawyer)
Head of Liability & Insurance
Practice Group: Corporate & Financial Litigation

Oliver Sieg is a partner in Noerr's Düsseldorf office and co-heads the litigation department. Oliver Sieg focuses on strategic advice to clients in disputes, dispute resolution and negotiations including, as an ultima ratio, litigation at first instance and appeal courts, particularly in complex and cross-border disputes. He is experienced in representing parties in arbitration proceedings, especially according to DIS or ICC rules and ad hoc. He has also been appointed as arbitrator.


  • Strategic Negotiations and Litigation 
  • Domestic and International Arbitration 
  • D&O, Professional- and Financial Institutions Liability
  • Corporate Disputes
  • Insurance and Reinsurance
  • Commercial Disputes (distribution, professional services, financial services)
  • Cyber Incident Response
  • Distressed Disputes


  • Legal studies at the Universities of Bonn, Cologne, Cambridge (UK), Speyer and Münster
  • Experience abroad: Weissberg Gaetjens Ziegenfeuter in Nice and Paris (France); Reynolds Porter Chamberlain in London (UK)
  • With Noerr since 2002
  • Admitted to the Düsseldorf Bar

Selected Projects

  • European specialty insurer (2022): Advising and representing the company in relation to W&I insurance due to the alleged breach of an insolvency warranty in the underlying SPA
  • European reinsurer (2022): Representing the company in arbitration proceedings against a European primary insurer concerning a reinsurance contract for business closure insurance in connection with Covid-19 risks
  • International construction company (2022): Providing insurance law advice in connection with an action for damages in the US regarding flood damage due to Hurricane Sandy in 2012 amounting to billions of dollars
  • Former board member of a manufacturer of solar modules (2022): Defending the client in court proceedings against claims for damages worth approximately €700 million from directors’ liability brought by an insolvency administrator due to allegations of a delay in filing for insolvency and seeking to set aside transactions
  • International consumer goods company (2021): Advising governing bodies on the enforcement of claims against board members and D&O insurance following a cartel fine


  • “Sieg is an experienced arbitrator who stands above all for D&O liability and disputes involving insurance issues,” JUVE Handbook 2022/2023 (Dispute Resolution)
  • “Responsive, extremely well-connected, excellent insurance know-how,” competitor, JUVE Handbook 2022/2023 (Dispute Resolution)
  • Recommended as a “leading name” in D&O advice, JUVE Handbook 2022/2023 (Insurance: Litigation and Advice)
  • "Vast experience of D&O,” competitor, JUVE Handbook 2022/2023 (Insurance: Litigation and Advice)
  • “The practice stands out for its great experience of corporate disputes, especially directors’ and officers’ liability matters, and equally for its advice on questions also requiring restructuring and insolvency expertise,” JUVE Handbook 2022/2023
  • Recommended as a leading individual in insurance/dispute resolution, Legal 500 (2022)
  • Leading lawyer for Litigation and Insurance and Reinsurance, Who is Who Legal Germany 2022
  • Recommended as a leading expert in arbitration and mediation, insurance law and litigation, Best Lawyers (2022)
  • "Oliver Sieg remains one of Germany’s top insurance law experts, representing insurers, corporates and board members in complex disputes regarding, inter alia, D&O claims”, Chambers & Partners, 2022 (Insurance)


  • DIS – German Institute for arbitration
  • VGR-Gesellschaftsrechtliche Vereinigung (Association for corporate law)
  • Member of the Advisory Committee of the Research Centre for Insurance at the University of Münster
  • Expert and Legislative Committee for Insurance Law of the German Bar Association
  • Head of the regional Düsseldorf bar Committee for Insurance Law
  • Industrieclub Düsseldorf