Established in 1856, Thommessen is a dedicated to be Norway's leading law firm, with offices in Oslo, Bergen, Stavanger and London. The firm has a high degree of international clients and assists in connection with a large number of complex transactions and projects across borders.

Thommessen has for many consecutive years been ranked as "Best legal competence – all legal areas" by the largest clients in Norway in the annual client survey by TNS Sifo Prospera. The firm is also consistently top ranked by rating agencies such as Chambers and Partners, The Legal 500, IFLR 1000 and Who’s Who Legal. This includes Band 1/Tier 1 ratings within areas such as M&A, Equity Capital Markets, Financing, Financial Regulation, Litigation and Competition law.

390 people work at Thommessen today. Approximately 290 of them are lawyers.

Areas of Practice

  • Asset Management
  • Capital Markets
  • Compliance and Investigations
  • Construction
  • Data Protection/Privacy and Cyber Security
  • Debt Financing
  • Dispute Resolution
  • Employment
  • EU/EEA Competition Law
  • Financial Regulation
  • FinTech
  • Fishery and Aquaculture
  • Insolvency and Restructuring
  • Insurance
  • Intellectual Property and Marketing Law
  • M&A and Corporate Law
  • Oil and Gas
  • Oil Service
  • Private Equity
  • PropTech
  • Real Estate
  • Renewable energy and Infrastructure
  • Shipping
  • Sustainability and Climate Risk
  • Tax and Duties
  • Technology and Digitalization
  • Venture Capital