About
Advokatfirmaet Thommessen AS is a leading Norwegian commercial law firm founded in 1856 with offices in Oslo, Bergen, Stavanger and London. The firm advises Norwegian and international clients in the private and public sectors, emphasizing practical, well‑founded advice and long‑term trust.
Practice areas
Office
Lawyers at this firm
Alexander Stulien
Managing Associate Alexander works primarily with construction and contract law. He assists both Norwegian and international clients with major development projects in the field of offshore, industry and renewable energy. A significant part of Alexander's work is related to dispute resolution. · Construction
Alexandra Refsnes
Managing Associate Alexandra assists Norwegian and international clients with legal counselling within all matters related to employment. Alexandra has competence and assists with inter alia dispute resolution and questions regarding everything from employments to termination. In addition, she assists Norwegian and international clients with employment related matters connected to mergers, demergers and acquisitions including legal advice connected to establishment and liqudation of companies in Norway. · Employment
Anders Arnkværn
Partner. Mr Anders Arnkværn has long experience within the areas of M&A and Capital Markets and advises on both large-scaled and small transactions. He is continuously ranked by recognised rating agencies among the leading Norwegian lawyers within both M&A and Capital Markets. Mr Arnkværn heads Thommessen's practice area for Private Equity. · Corporate / M&A
Anders Sundsdal
Anders specializes in a broad spectrum of employment law matters, offering guidance to both Norwegian and international clients across various industries. He possesses notable expertise in managing disputes, whistleblower cases, large-scale downsizing procedures, compliance investigations, HR issues, workplace accidents, and transactions. Additionally, Anders has considerable experience as a litigation attorney and negotiator and frequently delivers lectures on employment law topics. · Employment
Andreas Meidell
Mr Meidell works mainly on commercial insurance claims and coverage issues, such as marine/energy insurance, property and liability insurance, cargo insurance, as well as reinsurance. He is also a frequent litigator and appointed arbitrator in Norwegian and international arbitrations. He is also a member of The Norwegian Maritime Law Association (CMI). Mr Meidell heads Thommessen’s practice area of Insurance. · Insurance
Audun Stornes
Partner. Audun primarily advises Norwegian and foreign companies within Oil and Gas and within Oil Service. He assists oil companies with a broad variety of regulatory issues relating to the concession system and the joint operating agreement, including necessary contacts and intervention with the authorities including the MPE and other governmental bodies. Furthermore, he assists with contracts, transactions and dispute resolution. He has assisted buyers or sellers in a large number of transactions regarding transfer of participating interest in production licences on the Norwegian continental shelf (including transfer of interests in producing fields) or in the sale of shares in oil companies. Further, he has extensive assistance from dispute resolution and mediation within Oil and Gas and Oil Services and has acted both in capacity as litigator, Arbitrator/Judge or as mediator. Audun has over a long period been highly ranked for his competencies within oil and gas industry in different recognised legal awards. · Oil & Gas
Baard Bale
Partner. Mr Baard Bale focuses on, and has significant experience with, equity transactions and advises corporate clients, private equity sponsors and leading investment banks in a wide range of M&A transactions and IPOs. He is ranked as one of the leading M&A lawyers in Norway. · Corporate / M&A
Bendik Christoffersen
Mr Christoffersen works with matters concerning renewable energy and focuses on concession law, corporate organisation, M&A, tax and hydro power taxation. He also provides general business law advice to the renewables sector, which he knows really well through his work with all phases of the development of renewable energy projects. Mr Christoffersen is frequently recognised by international rating agencies. · Renewable Energy
Bjørn Christian Lilletvedt Tovsen
Partner. Bjørn Christian has broad experience advising clients and dispute resolution in connection with extensive and complex tax, duties and VAT related matters. He is especially experienced within the real estate and financial sectors, but also works with cross-border trade and transactions. Bjørn Christian is head of the firm's practice related to VAT, customs and excise duties. · Tax
Bjørn Sande Urtegaard
Partner. Bjørn has extensive experience with financing, restructuring and asset based transactions within shipping and the maritime industry. He assists lenders, borrowers and other stakeholders, both locally and internationally. Bjørn also assists on operational activities and contracts within shipping. · Shipping
Camilla Bergby
Camilla has extensive experience advising on Norwegian and international tax, corporate law and general commercial law. She has assisted on numerous transactions, restructurings and structural matters within aquaculture, fisheries, shipping, oil service and related industries. She also has as in depth knowledge of the Norwegian tonnage tax regime. In addition Camilla has extensive experience with assisting clients with successions and assists family offices on a regular basis. · Tax
Camilla Hammer Solheim
Specialist Counsel Camilla has extensive experience working with value-added tax, both for the tax authorities and as a lawyer. She has broad knowledge in the field and has assisted with advice, structuring, transactions, and audit/appeal cases in most business areas. She has a particular focus on real estate, financial services, and trade. · Tax
Camilla Vislie
Mrs Vislie heads Thommessen's IP and Technology practice. She works mainly with patent, trademark and copyright litigation, for clients within different sectors like commerce, technology and media. She has been involved in a number of well-known IP and media cases during the past years, including before the Supreme Court. She has many years experience from the Norwegian Bar Association’s Expert Committee on IP Law, and is frequently used as speaker on IP related issues. · Intellectual Property
Christian Grüner Sagstad
Head of M&A and Corporate law department, Partner. Mr Christian Grüner Sagstad, has long experience within M&A and equity capital markets transactions, and acts for numerous private equity firms, investment banks, stock exchange listed companies and private companies. · Corporate / M&A
Christian Hals
Partner. Christian works primarily with M&A and securities law within the oil and gas segment. He has broad experience with M&A and equity capital market transactions, and has inter alia assisted several issuers in connection with listings on the Oslo Stock Exchange. · Corporate / M&A
Christopher Borch
Partner. Mr Chris Borch mainly works with purchase and sale, development, leasing, and syndication of commercial property. He also has extensive experience in litigating real estate cases before arbitration tribunals and before the regular courts. International rating agencies rank Mr Borch as an expert in commercial real estate transactions. · Real Estate
Christopher Sparre-Enger Clausen
Partner. Christopher heads Thommessen’s Technology and Data Protection practice group and specialises within M&A, technology and data protection law. He has extensive experience from both domestic and international M&A and IT-projects, and regularly provide clients with legal and strategic advise within a broad range of areas relating to digitalisation and technology, such as data protection, cybersecurity, outsourcing, licensing, cloud computing, software development, as well as IP and regulatory matters pertaining to IT and telecommunications. · Corporate / M&A
Daniel-André Hansen
Daniel-André's main focus is both public law and private law issues related to the fishing and aquaculture industry. He also assists with general contract law, construction law issues and general dispute resolution for Norwegian and international clients in the fishing and aquaculture industry. · Fishing & Aquaculture
Einar Grette
Mr Einar Grette's practice focuses on financing and restructuring in the bank- and bond markets, including national and international loan agreements, syndicated facilities and bond issuances. He acts for banks, trustees, bondholders, investment banks and borrowers/issuers of financial products. Mr Grette is ranked among Norway’s leading lawyers within banking and finance and capital markets by international rating agencies. · Banking & Finance
Eirik W Raanes
Mr Raanes works primarily with dispute resolution within contract law, construction law, intellectual property law, insurance law and matters concerning corporate law. He acts regularly on behalf of large Norwegian enterprises in litigation procedures before the ordinary courts and in arbitration. Raanes has been heading Thommessen's Bergen office since 2011. · Dispute Resolution
Eivind J. Vesterkjær
Mr Vesterkjær's practice focuses on matters relating to competition law, public procurement and general legal advice to clients in a variety of sectors and industries, including life sciences, shipping and retail. He also does merger control work in connection with mergers, acquisitions and other concentrations. Mr Vesterkjær has for a number of years been ranked among Norway's leading lawyers within his fields of expertise. · Competition / Antitrust
Eivind Sæveraas
Associate Partner. Mr Sæveraas is primarily recognised for his work on several high-profile merger cases, as well as other competition law matters, including cartel cases and litigation. He assists clients in a wide range of industries, including construction, energy, telecommunication, publishing, media, insurance and transportation. He is co-editor and co-writer of the commentary to the Norwegian Competition Act published in 2009. · Competition/Antitrust
Elen Ingrid Cornelia Botten
Senior Associate Elen works mainly with competition law, public procurement law and general EU/EEA law. · Competition
Eli Karine Navestad
Eli Karine works in the Technology & Data Protection practice group. She primarily focuses on privacy, technology, corporate governance, and M&A. Eli Karine has extensive experience with complex projects within these areas, both as an in-house lawyer and external counsel, with a particular emphasis on privacy, compliance, and cyber security. Eli Karine also has extensive experience with internal training and practical implementation of new regulations, such as PSD2 and GDPR. · Technology
Ellen Heyerdahl
Partner. Mrs Ellen Teresa Heyerdahl has extensive experience with financing. She assists borrowers, lenders and arrangers with bilateral and syndicated facilities, bond loans and debt programs. Her main focus is on financing of vessels, aircrafts and offshore installations, as well as project and acquisition financing. · Banking & Finance
Emilie Falch
Emilie Falch is a Specialist Counsel in Thommessen. She is a dual qualified English and Norwegian lawyer and part of the shipping and offshore team. Emilie is an experienced shipping lawyer. She was several years with Wikborg Rein in their shipping offshore department in London and in Oslo. She has also been in-house legal counsel in DNV and worked with marine insurance (P&I and FDD) in Skuld. Emilie provides advice within all aspects maritime law. She has particular experience in assisting shipowners, charterers, yards and marine insurers with contractual advice and negotiations in addition to dispute resolution and court and arbitration proceedings in England and Norway. She also has experience with sale and purchase, financing and casualty work. Emilie is a board member of Incentra SA and vice president of WISTA Norway. She is part of the Center for Continuing Legal Education’s (Juristenes Utdanningssenter) academic committee for Shipping Offshore and she is an external examiner in English Law of Contract at the University of Oslo. · Shipping & Offshore
Ervin Auren
Partner. Mr Ervin Auren works primarly with mergers, acquisitions and capital market transactions, including IPOs, and he assists Norwegian and international clients. Ervin has long experience within M&A and capital markets transactions. He has been lead counsel on several large and complex national and international transactions, and has a special focus on the real estate and renewable energy markets. He is continuously ranked as a leading Norwegian lawyer within M&A by international rating agencies. Mr Auren is the head of Thommessen's transaction department. · Corporate / M&A
Espen Ommedal
Partner. · Tax
Espen Werring
Espen is a trusted adviser to organizations developing and implementing their mission-critical digitization strategies. He typically advice the largest organizations in the private sector with their sourcing of services within development, transformation, maintenance and operation of business-critical IT and business processes. He is ranked as one of Norway's leading lawyers within this field in national and international directories. · Information Technology
Even Bratsberg
Partner. Mr Even Bratsberg has twenty years of experience as lawyer in Thommessen and corporate finance director in SEB Enskilda and Pangea Property Partners. Clients praise his legal knowledge and commercial awareness. · Real Estate
Faraz Ahmed Ali
Managing Associate Faraz has extensive experience in Norwegian and international transaction processes, regularly assisting both lenders and borrowers in complex refinancing and restructuring processes. He also possesses significant expertise in contract law and has a strong track record in handling intricate transactions within the aviation and offshore industries. He is recognised in the market as one of the greatest talents working within financial restructuring. · Insolvency & Restructuring
Finn Backer-Grøndahl
Partner. Mr Finn Backer-Grøndahl works with both national and international tax law matters. He works, inter alia, on tax issues related to national and international transactions and restructurings. Mr Backer-Grøndahl heads the firm's practice area Tax and Duties. · Tax
Frida Stene-Slotte
Partner Frida has extensive experience within financing, restructuring and debt capital market transactions. She advises lenders and borrowers both locally and internationally on bilateral, syndicated and structured financing transactions and bond issues. · Banking & Finance
Gunnar Martinsen
A significant part of Mr Martinsen's work is related to the conditions of the power industry and energy law related litigation. He is ranked as a leading lawyer within his field in national and international rankings. He advises Norwegian and foreign power companies matters concerning energy, water resources and licensing. Mr Martinsen has assisted a number of power companies in connection with acquisitions, disposals, placements, mergers and various restructurings. · Energy
Halvor Mansåker
Mr Mansåker works primarily with debt capital market transactions, assisting both managers and issuers. In addition, he works with bank financing, restructurings and M&A. · Debt Capital Markets
Hans Cappelen Arnesen
Mr Hans Cappelen Arnesen ("Hasse") works primarily with matters concerning M&A, offerings and IPO's, and acts for a various corporate clients, private equity firms and leading investment banks. He is consistently ranked as a leading lawyer in Norway within M&A and equity capital markets by international rating agencies. · Corporate / M&A
Hans Haugstad
Mr Hans Haugstad predominantly works with financing transactions and assists both banks/financial institutions, investors and borrowers/issuers. He has been a member of the Norwegian Bar Association's law committee for banking and finance, and he regularly lectures on this topic. He is ranked among Norway’s leading banking and finance lawyers by international rating agencies. He heads the firm's practice area of Debt Financing. · Debt Financing
Hedda Leikvang
Managing Associate Hedda works within banking and financing and debt capital markets, where she advises domestic and international corporations, sponsors, lenders, and issuers on various financing transactions and structures within the bank and bond markets, with a particular focus on acquisition financing. She also has experience working with large corporate restructurings, principally within the oil, gas and offshore industries. She is also qualified as a solicitor in England & Wales and a licensed attorney in New York and the District of Columbia (inactive). · Banking & Finance
Hedvig Moe
Partner Hedvig began her legal career at Thommessen in 2000 and returned to the firm in May 2023. In the intervening years, she held key positions at the National Authority for Investigation and Prosecution of Economic and Environmental Crime, where she primarily focused on financial crime and held the position as acting director. Hedvig has also held leadership roles in the Norwegian Police Security Service (PST), including Deputy Director, where she developed knowledge on topics such as geopolitics, national security, and foreign intelligence. This has also provided her with valuable experience in collaborating with the defense sector. Through these and several other public sector positions, she has gained a deep understanding of central and local administration, political processes, and legislative work. At Thommessen, she leads the firm's National Security Advisory, where she provides legal and strategic advice across all areas relevant to national security. This includes the Security Act, personnel security, foreign direct investment (FDI), and defense procurements. Hedvig is also responsible for the firm's advisory on compliance, export control, and sanctions legislation. Hedvig has substantial experience with crisis planning and management, as well as public and media relations. · National Security
Henning Harborg
Mr Harborg assists clients from a wide range of business areas with dispute resolution and litigation in matters concerning contract law, administrative law, property law and bankruptcy law. · Litigation
Henrik Fabian Torgrimsby
Partner Henrik works in our Renewable Energy and Infrastructure department and primarily focuses on the contractual side of larger energy and infrastructure projects as well as complex supply agreements in Norway and internationally. He regularly assists in contract negotiations, ongoing project follow-up, and, if necessary, in disputes that may arise. Henrik has led numerous international negotiations. Henrik has extensive experience with insurance matters – including project insurances and directors' liability insurances, among others. Henrik is part of Thommessen's sustainability law group and is closely involved with the sustainability regulations relevant to suppliers in energy and infrastructure projects. Henrik has received several awards for his work in project development, contracting, insurance, and energy. · Renewable Energy
Henrik Hagberg
Partner. Mr Henrik Hagberg has broad experience from working with both contentious and non-contentious matters within the entire shipping and offshore industry, inter alia in connection with shipbuilding and offshore construction, sale & purchase and financing of vessels and rigs, including project finance, emergency response and casualty investigation and marine and energy insurance related matters, including insurance cover disputes. Mr Hagberg also has experience from the Norwegian oil and gas industry, in particular with respect to the Norwegian gas export industry. · Shipping & Maritime
Henrik Møinichen
Partner Henrik primarily works with dispute resolution and negotiations within shipping, the insurance market and other industries, as well as a variety of construction and project related disputes. Henrik has litigated several high-profile cases and has gained extensive experience with national and international arbitration and other forms of alternative dispute resolution. In recent years, Henrik has been heavily involved in disputes related to shipbuilding, cargo damage and casualties, insurance coverage (including all forms of marine insurance), charterparties, as well as larger project disputes. · Dispute Resolution
Håkon Berge
Håkon is a Specialist Counsel in Thommessen and works at the Bergen office. Håkon works mainly with consulting and dispute resolution within employment law, as well as company and contract law. He has litigated numerous cases for both district court and appeal court, and has experience with arbitration. Håkon is a widely used lecturer, especially within the field of employment law. · Employment
Jacob F Bull
Mr Bull's work mainly relates to offshore and onshore construction projects within oil & gas, renewables, process and aluminium industry. Jacob has extensive experience from development projects also outside Norway, and his name is often highlighted by international rating agencies. · Construction
Jan Brudvik
Mr Brudvik has extensive and varied experience related to transactions, and bank and bond financing for both borrowers and issuers. He also assists during drafting and negotiations of contracts for Norwegian and international clients within the shipbuilding and Oil Service industries. Brudvik also gives advice concerning company, stock exchange and securities law. · Banking & Finance
Jan J Greve
Mr Greve assists banks and borrowers, and has extensive experience with bilateral and syndicated loans and guarantee facilities within the shipping industry. He also assists shipowners with ship sale and purchase transactions, chartering arrangements, building contracts and other contracts within the shipping industry. Furthermore, Greve works with joint ventures, restructurings, M&A transactions and IPO’s within the shipping industry. · Banking & Finance
Jenny Mo
Jenny is mainly working with commercial real estate transactions and commercial leases, and assists Norwegian and international clients in connection with sale and purchase of commercial real estate and negotiation of leases. Jenny has in recent years been involved in several of Norway's largest commercial real estate transactions. She manages and coordinates a dozen commercial real estate transactions each year, and also regularly assists as closing agent, as well as other issues related to legal real estate matters. · Real Estate
Jostein Opdahl-Jenssen
Managing Associate Jostein works mainly within the field of employment law, and assists Norwegian and international clients in a wide range of employment related questions. He has particular expertise in dispute resolution, personnel matters, whistleblowing and investigation cases, as well as issues related to access to and monitoring of employees' use of electronic equipment. · Employment
Julie Rasmussen Solli
Specialist Cousnel Julie works with dispute resolution and advice within copyright, trademark, consumer -and marketing law, as well as with the Transparency Act. Julie has particular knowledge of consumer and marketing law and assists national and international companies with all aspects of offering goods and services to consumers. · Intellectual Property
June Snemyr
June Snemyr mainly advises clients within the oil- and gas industry, renewables sector as well as actors within alternative energy sources. She assists clients with energy and infrastructure projects, in regulatory matters, M&A and she regularly acts as legal advisor in commercial negotiations. June has unique experience with CCS projects after having served as acting General Counsel of Northern Lights JV second half 2022. In addition she has substantial experience working with offshore electrification projects, agreements on third party access to existing infrastructure, oil- and gas related M&A, questions under the Norwegian joint operating agreement, as well as infrastructure matters and product sales agreements. Further, she has a particular focus om new energy related industries, such as development of offshore wind projects, battery production and hydrogen projects. After having worked nearly five years as in-house counsel in TotalEnergies, June has in-depth industry knowledge and a practical approach to resolving the various matters with a business understanding our clients value. · Energy
Katinka Ranberg
Partner Katinka works with M&A and equity capital market transactions. She advises businesses within a wide range of industries, and works with both listed and unlisted issuers, investment banks and industrial and private equity clients. Katinka has experience as project manager on several complex transactions, and also assists clients on matters relating to corporate and securities laws. · Corporate / M&A
Kristine Hyldmo Bjørnvik
Partner. Kristine mainly works with dispute resolution with a particular focus on offshore and construction. She specializes in litigation and arbitration, offshore contracts and construction law. She has broad experience with litigation, mediation and arbitration both in Norway and internationally. Kristine also has in-depth knowledge of the oil- and gas industry. · Dispute Resolution
Kristoffer Hegdahl
Partner. Kristoffer has extensive experience from domestic and cross-border financing transactions, acting for banks and corporates. He also holds experience from bond issues, securitization projects, as well from securities lending and repo/derivative transactions. Kristoffer also works on debt restructuring projects and corporate insolvency. In addition, he teaches in several of these subjects at the University of Oslo. · Banking & Finance
Lars Eirik Gåseide Røsås
Partner. Mr Lars Eirik Gåseide Røsås advises a number of listed companies regarding Securities Law and Corporate Law issues, in both ongoing advice and in connection with transactions. Through his presence in London, he has a particular responsibility for cross-border advice, plus maintaining and developing Thommessen's international network. Mr Røsås heads Thommessen's London office. · Corporate / M&A
Lisa Marie Opdahl
Partner Lisa is part of our shipping and offshore department and our seafood team. Lisa mainly works with transactions and contract assistance within the shipping and seafood sectors as well as other maritime industries. She assists Norwegian and international clients with, among other things, M&A and establishment of joint ventures, sale and purchase of vessels, newbuilding projects, financing, sale and leaseback, charter party negotiations and a wide range of other contracts. · Shipping & Offshore
Mads Haavardsholm
Mr Haavardsholm works primarily with contract negotiations and transactions towards clients in the shipping, oil service and oil & gas sectors. He regularly advices companies with charterparty negotiations and disputes, sale and purchase of drilling rigs and vessels, field developments and construction projects, newbuilding and IMR contracts, as well as all types of service and supplier contracts. · Shipping
Magnus Hauge Greaker
Partner Magnus mainly works with patent, trademark and trade secrets litigation, for clients within life sciences, oil and oil-service and other technology. Magnus' experience also covers marketing law, pharmaceutical regulatory law and administrative law. · Intellectual Property
Marianne Brynjulfsen Overaa
Specialist Counsel Marianne works primarily with tax related question of national and international character, as well as corporate law. She assists clients with transactions and in restructurings, and also provide advise related to the Norwegian tonnage tax. Marianne provides general tax advisory services and has experience with appeals of administrative tax rulings. · Tax
Marius Holm Rynning
Partner. Mr Marius Holm Rynning primarily works with tax law and corporate law. He focuses on Norwegian and international tax law issues in connection with transactions, private equity, restructurings and financing. Marius also assists on incentive programs for private equity owned companies, general tax advice and tax disputes. · Tax
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