Firm Profile

Header Image for Advokatfirmaet Thommessen AS

Advokatfirmaet Thommessen AS

Firm Details

Thommessen is one of Norway’s leading commercial law firms, with offices in Oslo, Bergen, Stavanger and London. Since our foundation in 1856, we have been closely involved in most of the defining developments in Norwegian business. Our clients are Norwegian and international businesses, in both the private and public sector.

Thommessen assist businesses with transactions, complex projects and contentious matters in all areas of commercial law. Their robust professional legal expertise is combined with in-depth industry knowledge, and their lawyers stay abreast of trends and developments on an ongoing basis in order to provide advice which facilitates long-term value creation.

At Thommessen, we enable our clients to achieve their objectives by understanding their challenges and opportunities. Our advice is clear, well-founded and practically oriented, and is premised on in-depth understanding of the factors affecting the interests of our clients, whether commercial, technological, societal, political or global.

Earning trust

Our business is built on trust. We repay that trust by how we relate to each other, our clients, our business partners and other parties. In a rapidly changing world, we are focused on understanding our clients and tailoring our services to their needs. We earn trust.


Mirella Gullaksen
Head of Marketing and Client Development
Sverre Tyrhaug
Managing Partner

Top Listed National Awards

  • Top Listed in Norway in Tax Law with 5 lawyers

Top Listed City Awards

  • Top Listed in Oslo in Tax Law with 5 lawyers


  • "National firm of the year – Norway" by IFLR Europe Awards 2020
  • "Number one law firm" in the TNS Prospera Law Firm Review 2020
  • "Firm of the Year - Norway" by Who's Who Legal 2019


Sverre Tyrhaug
Managing Partner

Firm Practice Areas

  • Arbitration and Mediation
  • Asset Finance Law
  • Banking and Finance Law
  • Biotechnology Law
  • Capital Markets Law
  • Competition / Antitrust Law
  • Construction Law
  • Corporate Governance & Compliance Practice
  • Corporate Law
  • Criminal Defense
  • Electricity
  • Employee Benefits Law
  • Energy Law
  • Environmental Law
  • European Union Law
  • Human Rights Law
  • Information Technology Law
  • Insolvency and Reorganization Law
  • Insurance Law
  • Intellectual Property Law
  • International Arbitration
  • Investment
  • Labor and Employment Law
  • Litigation
  • Media Law
  • Mergers and Acquisitions
  • Mergers and Acquisitions Law
  • Natural Resources Law
  • Offshore
  • Oil & Gas Law
  • Privacy and Data Security
  • Private Equity Law
  • Project Finance and Development Practice
  • Public Law
  • Real Estate Law
  • Regulatory Practice
  • Shipping & Maritime Law
  • Structured Finance Law
  • Tax Law
  • Technology Law
  • Telecommunications Law
  • Trade Law
  • Transportation Law
  • Trusts and Estates

Office Locations



Bergen, Norway

Vestre Strømkaien 7

Postboks 43 Nygårdstangen

Bergen 5838


55 30 61 00

Get Directions

Oslo, Norway

Haakon VIIs gate 10

Postboks 1484 Vika

Oslo 0116


47 23 11 11 11

Get Directions

Stavanger, Norway

Kirkegata 2

Stavanger 4006


47 51 20 80 00

Get Directions

United Kingdom

United Kingdom

London, United Kingdom

Paternoster House 2nd floor

65 St Paul's Churchyard

London EC4M 8AB

United Kingdom

44 207 920 3090

Get Directions