Advokatfirmaet Thommessen AS > Oslo, Norway > Firm Profile

Advokatfirmaet Thommessen AS
Ruseløkkveien 38, 0251 Oslo
PO Box 1484 Vika
NO-0116 Oslo

Norway > Banking and finance (including shipping finance) Tier 1

Praised by clients for its ‘very strong, commercially minded’ team, Advokatfirmaet Thommessen AS‘ banking and finance offering spans the full range of financial matters, with a recent highlight showcasing its advice to Danske Bank regarding the sale of its Norwegian personal banking business to Nordea. Ellen Teresa Heyerdahl heads up the firm’s banking and finance practice, working alongside Tore Mydske, who leads the financial regulatory sub-group, another core area of expertise for the firm. Hans Haugstad has a particular focus on cross-border financings and acquisition finance, while Kristoffer Hegdahl takes point on debt restructuring and corporate insolvency work. At associate level, Hedda Leikvang is also recommended for her acquisition financing expertise.

Practice head(s):

Ellen Teresa Heyerdahl; Tore Mydske

Other key lawyers:


‘Thommessen has a very strong financing team that covers all aspects of our business needs, from regulatory issues to transaction work.’

‘Hans Haugstad is a natural go-to guy for most kinds of financings. He is very pleasant to work with and good at project management and keeping a transaction going.’

‘Hedda Leikvang is an up and coming star from Thommessen, highly regarded for her skills and effective way of leading transactions in a positive way.’

‘Excellent project management expertise for complex problems. Strong legal competence with a “can do” attitude.’

‘The team handles without problem everything from the most complicated syndicated financing structure case to a plain vanilla bilateral bank financing transaction. The composition of the team is also well balanced and fits together efficiently.’

‘The partners Ellen Heyerdahl, Hans Haugstad, and Kristoffer Hegdahl, and managing associate Faraz Ahmed Ali are hard working, well experienced and top qualified lawyers in different roles of the team. They deliver expert advice both individually and as a team that stands out.’

‘A very strong, commercially minded team with excellent legal knowledge.’

‘Ellen Teresa Heyerdahl is very knowledgeable and very good at seeing and explaining the bigger picture, to assist clients with decision-making.’

Key clients


Nordea Bank Abp

Danske Bank A/S

Svenska Handelsbanken

Skandinaviska Enskilda Banken AB

Eksfin (ECA)

Pareto Securities AS

ABG Sundal Collier ASA

Nordic Corporate Bank ASA

Euronext Oslo Børs

Pareto Alternative Investments AS

Storebrand ASA

Swedbank AB

Sparebank1 Gruppen AS

Seadrill Limited

Sparebank 1 SR-Bank

Finance Norway

Kommunal Landspensjonskasse (KLP)

Gabler Investments AS

Pareto Bank AS

Oaktree Capital

Elkem ASA

B2Holding ASA




Work highlights

  • Advised Danske Bank A/S with the sale of Danske Bank’s personal banking business in Norway to Nordea.
  • Advised Goldman Sachs Asset Management on its NOK6.6bn acquisition of Frøy ASA, including in the financing of the acquisition with a syndicate of banks.
  • Advised Swedbank AB on the asset sale of (i) a loan portfolio to Sparebank 1 SR Bank ASA and (ii) investment banking business related to M&A and high-yield bonds to Sparebank 1 Markets AS in 2022.

Norway > Capital markets Tier 1

With a large and experienced team described by clients as ‘one of the best in Norway’, Advokatfirmaet Thommessen AS continues to act on a high volume of complex transactions, IPOs, and private placements. Acting for an impressive client roster that includes large domestic and international investment banks and corporates, the team has particular strength in equity capital market transactions. Practice co-head Christian Grüner Sagstad is a key name here, working alongside co-head Einar Grette, who takes point on debt capital markets matters. Other key ECM names include Hans Cappelen Arnesen, Anders Arnkværn and Solveig Fagerheim Bugge, while new partner Frida Stene-Slotte and the ‘highly skilledHalvor Mansåker are key contacts on the DCM front.

Practice head(s):

Christian Grüner Sagstad; Einar Grette


‘One of the clear leaders in Norwegian capital markets. Definitely a go-to firm in the Norwegian market. Maybe the best team available for Norwegian ECM/IPOs and they are strong in M&A as well. They have broad capabilities and high quality.’

‘We have worked with Anders Arnkværn on several IPOs. He has a hands-on approach and is quick to respond on important matters. Also pragmatic. We also have very good experience with the rest of the team associates and senior associates (and other partners).’

‘Our go-to firm for negotiations and regulatory discussions. Highly skilled at negotiations and contracts, with particular skills within financial regulations. Very good at resource allocation – always capacity.’

‘Anders Arnkværn – negotiator with exceptional commercial understanding. Hans Arnesen – highly skilled and extremely trustworthy confidant and strategic planner.’

‘Halvor Mansåker – Highly experienced and skilled legal professional able to see the client’s needs from both a legal and practical point of view.’

‘Frida Stene-Slotte – excellent legal skills. Expedient and accurate and able to deal with a number of highly complex legal matters at the same time.’

‘Extremely qualified and knowledgeable. Very strong team – one of the best (if not the best) in Norway.’

‘Extremely competent team members from partners to junior resources.’

Key clients


Nordea Bank

Danske Bank

Svenska Handelsbanken

Pareto Securities AS

Pareto Alternative Investments AS

ABG Sundal Collier ASA

Sparebank 1 Markets

Sparebank 1 Gruppen AS

Carnegie AS

Arctic Securities AS

Skandinaviska Enskilda Banken AB

Fearnley Securities

B2Holding ASA

Nordic Trustee AS

Norlandia Health & Care Group AS

NES Fircroft Bondco AS

Goldman Sachs International

Swedbank AB

Lyse AS

Infront AS

Rederiaktiebolaget Eckerö

Morgan Stanley

UBS Investment Bank

Seadrill Ltd

Salmones Camanchaca S.A.


Webstep ASA

Elkem ASA

Odfjell Drilling Ltd.

Oslo Børs VPS Holding ASA

Kongsberg Gruppen ASA

Shelf Drilling, Ltd.

BW Group Limited

BW Offshore Limited

BW LPG Limited

BW Energy Limited

Hafnia Limited

Navamedic ASA

RAK Petroleum plc

Stolt-Nielsen Ltd.



MPC Container Ships ASA

Höegh Autoliners ASA

Magseis Fairfield ASA

Pioneer Property Group ASA

Icelandic Salmon AS

Everfuel A/S

Norwegian Property ASA

Lytix Biopharma AS

Komplett ASA

Cadeler A/S

Sats ASA

Borgestad ASA

Work highlights

  • Advised Kahoot! in connection with the ongoing takeover offer from Goldman Sachs Asset Management and certain other investors for an aggregate equity purchase price of NOK17.2bn.
  • Advised Clarksons Securities AS, DNB Markets, a part of DNB Bank ASA and Pareto Securities AS on Borr Drilling Limited’s $250m senior unsecured convertible bonds and $150m senior secured high yield bonds.
  • Acted for DOF Group ASA in connection with its comprehensive refinancing (converting debt of appr. NOK6bn to equity) and subsequent IPO on Oslo Børs (main list), completed in June 2023.

Norway > Commercial, corporate and M&A Tier 1

Advokatfirmaet Thommessen AS is ‘capable, pragmatic and solution oriented‘ and is sought after for its expertise in public and private cross-border M&A work, particularly in combination with equity issues and debt financings. Practice head Christian Grüner Sagstad acts for a variety of private equity companies and other clients on M&A and equity capital markets transactions. Hans Cappelen Arnesen  is a capital markets and M&A expert, who advises a variety of corporate clients, private equity houses and investment banks; and Anders Arnkværn is highly experienced in public and private M&A and capital market transactions. The group also includes Ervin Auren, who advises on national and international M&A and capital markets transactions; and Baard Bale, who acts in numerous public and private M&A and capital markets transactions. Tore Mydske, who has great ‘commercial skills‘, and Solveig Fagerheim Bugge are also key contacts.

Practice head(s):

Christian Grüner Sagstad


‘The Thommessen team has a great combination of availability, legal and commercial skills.’

‘The team is very capable, pragmatic and solution-oriented. Strong team. One of the best (if not the best) in Norway.’

‘Competency, availability, market and sector knowledge, and legal finesse.’

‘Tore Mydske is Norway’s best on finance regulatory issues in combination with commercial skills.’

Key clients

Altor Equity Partners

Triton Partners





Kongsberg Gruppen



Bain Capital

Goldman Sachs

Det Norske Veritas Holding / DNV GL AS

Nordic Capital


Odfjell Drilling Ltd.


BW Group

Oslo Børs VPS Holding

Belships ASA


CBRE Caledon

Pioneer Property Group ASA

Reiten & Co.

Accel Management

Mercell Holding


Komplett ASA

Accent Equity Partners AB

Assemblin AS


TD Veen AS

SpareBank 1 SR-Bank Markets/SpareBank 1 SR-Bank ASA


EXP Group AS

EMK Capital

Work highlights

  • Advised Goldman Sachs Asset Management on its NOK6.6bn public takeover of Frøy ASA.
  • Advised Glitre Energi in connection with the merger with Agder Energi AS.
  • Assisted Danske Bank with the cross-border business combination between the Danish leading digital wallet, MobilePay, and the Norwegian wallet Vipps.

Norway > Dispute resolution Tier 1

Kristine Hyldmo Bjørnvik heads up the ‘excellent‘ disputes practice at Advokatfirmaet Thommessen AS, which fields a large and experienced team with a strong track record in advising blue-chip clients across the full spectrum of commercial disputes, including post-M&A, banking and finance, insurance, and maritime disputes. White-collar crime mandates are the area of focus for the ‘highly competent’ Henning Harborg, while ‘fantastic’ litigator Eirik W Raanes handles competition law matters as well as general commercial disputes. Other key names in the team include corporate law expert Stig Berge and leading insurance litigator Andreas Meidell, who handles both land-based and maritime insurance cases. The team also includes new partner Nanette Arvesen, who focuses on professional liability cases and post-M&A disputes.

Practice head(s):

Kristine Hyldmo Bjørnvik


‘For me as a client the personal engagement, availability and predictability in responding when needed is of major essence. Especially the collaboration and communication with me as a client to find the best way forward is greatly appreciated.’

‘My main connection and reason for using Thommessen AS, is partner Kristine Hyldmo Bjørnvik. She is just amazing at setting the right direction and bringing in others as needed. I also want to focus on Nanette Arvesen. Excellent and a strong contributor to my satisfaction with Thommessen.’

‘Eirik Raanes is a fantastic litigator. He explains the case in a simple way, yet with great focus on the important details.’

‘I find Henning Harborg to be highly competent.’

‘Excellent litigation team which benefits from expertise both in litigation and legal knowledge within the areas of business law. High capacity to process large and complex cases.’

‘Stig Berge is an excellent litigator, extremely knowledgeable in all areas of business law and a pleasure to work with.’

‘Nanette Arvesen is an excellent litigator with an impressive track-record of high-profile cases over the last few years. She is also a pleasure to work with.’

‘The firm has a professionally very strong department within dispute resolution. Furthermore, the department has some of the country’s most skilled procedural lawyers. They work thoroughly and efficiently, and are always available to the clients. We have a very positive experience with the firm.’

Key clients



Telenor ASA

Storebrand ASA

Equinor ASA

BW Group Limited

BW LPG Limited

The Norwegian Ministry of Transport / The Norwegian Public Road Administration (NPRA)

Westcon Yards AS

Directors/shareholders of RenoNorden

Firda Seafood Group AS

MDE Group AS/MDE Personell AS

TGS Nopec Geophysical Company ASA

Brit Insurance


Norxe AS

Intervet International BV

Zimmer Biomet Norway AS

Pareto Securities AS

Songa Corp.

Assuranceforeningen Gard (gjensidig)

Lyse Produksjon AS

Samsung Electronics Nordic AB

Gasum Oy


Søylen Eiendom AS

Tryg Forsikring

Kongsberg Gruppen ASA

Norwegian Hull Club

Navigators Holdings (UK) Ltd

Bane Nor SF

Kesko Corporation

Orkla ASA

Norgesgruppen ASA

Eika Gruppen AS

Koppernæs AS

DAF Trucks N.V.

Haugaland Kraft AS


Kimek AS

Cap Vest

MSG Aviation AS

Markel International Ltd

Stadyard AS


Vestland fylkeskommune (Vestland County Council)

Promenaden Management AS


Eksportfinansiering Norge (Export Finance Norway)

QBE Insurance


The Norwegian Coastal Administration (Kystverket)

Borgestad ASA / Borgestad Properties AS

Måsøval AS

Måsøval Eiendom AS

Finsbråten Eiendom AS


Kistefos AS

Sparebank 1 Utvikling AS

Brødrene Jensen AS

Eagle Group AS

Frogn municipality

Austevoll Melaks AS

Langøylaks AS

Troland Lakseoppdrett AS

EXP Group AS

Instabank ASA

Nordic Corporate Bank ASA

Therium Capital Management AS

Samhällsbyggnadsbolaget i Norden AB

Storebrand Bank ASA

Sirkel Materialgjenvinning AS

Småkraft AS

Fiskebas Holding AS

Work highlights

  • Acting for several insurers in a claim brought by various funds against two directors of Norge Skog ASA.
  • Represented DAF Trucks Deutchland GmBH and DAF Trucks N.V. – the opposing party, Posten Norge AS, put forward claims of approximately NOK1bn based on an alleged breach of competition regulations.
  • Acted as Sparebank 1 Utvikling AS’ counsel in a dispute against TietoEvery AS concerning pricing and duration of the existing contracts.

Norway > Employment Tier 1

Advokatfirmaet Thommessen AS fields a broad employment practice with particular strength in litigation, investigations and large transfers of business transactions, particularly in the oil and energy sectors. The ‘very skilled’ team possesses in-depth knowledge of compensation and benefits issues, pensions, strikes and collective agreements. Practice head Stein Kimsås-Otterbech is an experienced litigator and is renowned for his advice involving changes in senior management and transfers of undertakings. The group also includes Tron Dalheim, who is a skillful litigator in the oil, energy and aviation sectors; Håkon Berge, an expert in dispute resolution and litigation; and Anders Sundsdal, who focuses on litigation, redundancy processes and transactions. Trine Vabø is also recommended for her ‘excellent legal opinions’ in all areas of employment law, especially within the energy and renewables sectors.

Practice head(s):

Stein Kimsås-Otterbech


‘Thommessen’s employment law team consists of professional lawyers who are very structured, efficient and good at client handling.’

‘The practitioners we have used in Thommessen are very competent and knowledgeable. They meet us clients with a business oriented mind, and go straight to the point of what we’re requesting. They’re available on short notice and also for short calls, clarifications and questions.’

‘Extremely responsive and honest. Best one-stop shop we’ve used.’

‘They know our business better than others.’

‘They ask and listen to the client’s views, and have a good understanding of the business that the client operates in. They are efficient, professional and structured. They can be trusted and they always deliver on time.’

‘All the people are very skilled. They have unique competence in every aspects of the law.’

‘I’ve worked with Tron Dalheim and especially appreciate his availability, business oriented mindset and ability to see the important factors as well as to negotiate and find practical and sensible solutions.’

‘Trine Vabø combines legal skills with pragmatism and she understands the needs of a professional client. She is on point with regards to advice and she delivers excellent legal opinions. She also masters being a valued sparring partner.’

Key clients

Total Energies EP Norge AS

Scandinavian Airlines System (SAS)



Wintershall DEA Norge AS

Gard AS

Equinor ASA

Microsoft Norge AS

B2Holding ASA


Kongsberg Gruppen ASA

NorgesGruppen ASA

Bama Gruppen AS

Yara International ASA

Roche Norge AS

University of Bergen

Vestland county authorities

FH Gruppen AS

Höegh Autoliners Management AS

CGG Services

CapMan Infra and CBRE Caledon

DOF Subsea

Etac AB/Etac AS

Frydenbø AS

Framo AS

Oceaneering AS


Autostore AS





Klarna AB

MDE Group AS / MDE Personnel AS

Agilent Technologies

Boost Ai

Zalando SE


Dignita Systems Norge AS

Phillip Morris Norge AS


Melberg Partners AS



CTEK Norway AS

Seaway 7



Union Residental Holding (Bonova)

Hunter Group ASA

Danske Bank – Solo

Bruun Hjejle


Fitjar Kommune

Fakta AS

Redy Norge





Nordic Semiconductor



Brevik Engineering AS

Contemporary Amperex Technology Co. Ltd.

Field Group AS – Ocean Freight Exchange

HCL Technologies

Work highlights

  • Advised Oslo Stock Exchange-listed renewable player Scatec ASA with a complex redundancy process involving more than 30 roles being removed without any claims brought before the courts.
  • Representing Nordea in ongoing lawsuits regarding potential misconduct by employees.

Norway > Energy

Advokatfirmaet Thommessen AS attracts praise for its ‘deep industry knowledge‘ and routinely advises clients on the full spectrum of regulatory, contractual, M&A, restructuring and contentious mandates. Christian Hals leads the oil and gas team and takes point on M&A and capital markets transactions on the Norwegian Continental Sshelf. Hals works alongside Pål Lieungh and Audun Stornes; Lieungh has an impressive track record advising Norwegian companies undertaking offshore and oil and gas international projects and also handles disputes, while Stornes works with clients in the upstream and oil service sectors, handling contentious mandates. On the renewables front, Bendik Christoffersen oversees a strong group with expertise in project development and structuring, project finance, and expropriation and valuation issues. Gunnar Martinsen is the key contact for regulatory mandates and energy-related litigation, while June Snemyr heads up the renewables team in Stavanger.

Practice head(s):

Bendik Christoffersen; Christian Hals

Other key lawyers:


‘Thommessen have some of the best people available to carry out the work.’

‘Nice, skilled, broad expertise areas and proactive.’

‘Audun Stornes should be mentioned as a very competent and helpful person with great knowledge of the E&P business in Norway.’

‘From my experience with them, Thommessen has strong experience in the energy sector in Norway, and is very well connected to the energy eco-system which is very useful for a foreign investor with limited experience in the country.’

‘I worked with Kai-Ståle Kristiansen who has been very impressive, probably one of the best lawyers I have worked with: very thorough and knowledgeable while being pragmatic and looking for solutions to make deals happen.’

‘Gunnar Martinsen has deep industry knowledge and network combined with law to create practical, feasible solutions.’

‘Unique and broad competence in all relevant legal areas, always available for us as a customer, excellent discussion partner and adviser that helps us find the best solutions growing our businesses and securing compliance in all relevant matters.’

Key clients

Green Investment Group

Akershus Energi AS

Eidsiva Energi AS with subsidiaries

Lyse AS / Lyse Energi AS with subsidiaries

Nordkraft AS with subsidiaries


Haugaland Kraft AS with subsidiaries

Tonstad Vindpark AS

Zephyr AS

Haram Kraft AS

Lutelandet Energipark AS

Glitre Energi AS/Å Energi AS with subsidiaries

Vardar AS with subsidiaries

Sira-Kvina Kraftselskap

Småkraft AS

Tysvær Vindpark AS

Østfold Energi AS

Yve AS (incl Kraftriket AS and Polar Kraft AS)

Beyonder AS


Epex Spot

Encavis AG

Multiconsult Norge AS

Northern Lights JV DA

Deep Wind Offshore AS

Norway Fortescue Future Industries AS

Cadre AS

SWEN Capital Partners

InfraVia Capital Partners

Fu-Gen AG

Solgrid AS

Scatec ASA

Release Solar AS

Endra AS

Havfram AS

Cloudberry ASA

Vianode AS

BP International


Kongsberg Gruppen



Island Offshore

Island Drilling Company

Vard Group AS

Odfjell Drilling


Shelf Drilling

Vår Energi

BW Offshore

Wellesley Petroleum


MOL Norge

Myklebust Verft

TTC Norge

Veolia Environmental


A/S Nymo

BW Energy

Longboat Japex Norge

Longboat Energy plc

LOTOS Exploration and Production Norge

Wintershall Dea Norge


Hav Energy AS


Petoro AS

TotalEnergies E&P Norge AS

Optime Subsea AS

ECOnnect Energy AS

OMV Norge

Work highlights

  • Advised HitecVision in connection with the establishment of Aneo AS, a renewable JV.
  • Advising Norway Fortescue Future Industries AS in connection with the development of a major hydrogen production facility in Holmaneset (Bremanger, Norway), and in connection with other potential projects relating to the production of green hydrogen and ammonia.
  • Advised Longboat Energy plc. on the establishment of a joint venture with Japex Corp.

Norway > EU and competition Tier 1

Lauded by clients as ‘simply the best’, Advokatfirmaet Thommessen AS continues to act on the full spectrum of EU and competition work, with a ‘stellar’ offering that spans antitrust, cartel, merger control, and regulatory state aid mandates. Practice head Heidi Jorkjend has extensive experience advising on investigations and general merger control mandates. Siri Teigum takes point on contentious mandates, complex mergers, and a range of EEA and competition cases before the various European courts. The ‘experienced and highly competentEivind Vesterkjær has a broad practice that spans competition, state aid, and public procurements matters.

Practice head(s):

Heidi Jorkjend

Other key lawyers:


‘Thomessen is a stellar law firm; the go-to firm in Norway. Their lawyers are pragmatic, down-to-earth and sharp litigators. They were simply the best.’

‘Eivind Vesterkjær is an experienced and highly competent adviser who can be trusted to serve his clients in the best possible way. He is responsive, communicates well with clients and provides practical advice taking relevant business perspectives into account.’

‘Easy-going and highly professional competition practice. The team was swift to familiarise itself and get up to speed on what we needed.’

‘Competent, agile, practical approach, responsive.’

‘Heidi Jorkjend has been our main contact. She has an excellent understanding of a very complex legal area and was able to quickly get up to speed. From working with her and her team, it’s also clear that she makes an effort to include her associates and ensures that they are given a chance to participate directly with the client in a meaningful manner.’

‘Highly experienced and excellent legal knowledge in EU and competition matters. Siri Teigum has outstanding knowledge of competition law.’

Key clients

SpareBank 1

Kongsberg Gruppen

Veidekke ASA

Ringnes ASA

Gyldendal ASA

Lindum AS

Eviny AS


NorgesGruppen ASA

Circle K


El-Proffen AS


Triton Partners

DAF Trucks N.V. / DAF Trucks Deutschland GmbH

Lyse AS / Lyse Produksjon AS

Kahoot! ASA

Storebrand ASA


Peak Invest

Elkem ASA


Rexel Dévéloppement S.A.S.

Play Magnus Group


Bluestep Bank

Danske Bank

Wintershall Dea

BW Offshore

Bane NOR

Work highlights

  • Assisting NorgesGruppen ASA in relation to the Norwegian Competition Authority’s ongoing investigation of the Norwegian foodstuffs market.
  • Advising Gyldendal in connection with the decision of the Norwegian Competition Authority to impose a fine on Norway’s four largest publishing houses and the provider of the database Bokbasen for alleged exchange of future book prices and other competitively sensitive information.
  • Assisted Elkem with the competition law aspects of the transaction that transformed its subsidiary Vianode (producer of sustainable battery materials) into a joint venture between Elkem, Norsk Hydro and Altor.

Norway > Fishing and aquaculture Tier 1

Fielding a ‘highly skilled‘, large and cross-disciplinary team with extensive industry experience, Advokatfirmaet Thommessen AS leverages its strength across several legal disciplines to provide a full-service offering that stands out for its ability to handle high-value and complex contentious and non-contentious mandates. Mons Alfred Paulsen oversees the group and has extensive experience advising clients on corporate and tax matters relating to the industry, with a recent area of focus being the new proposed ground rent tax. Trond Hatland takes point on contentious mandates, while Rune Ulriksen Steinsland is also recommended as the key contact for contracts, project developments, and financing mandates.

Practice head(s):

Mons Alfred Paulsen


‘Our view is that Thommessen has a strong team with in-depth knowledge about our industry.’

‘The individuals we work with have very good knowledge about the industry.’

‘Mons Paulsen and Rune Steinsland are trusted and have a high degree of integrity. Competence of the industry sector.’

‘Highly skilled team, with in-depth industry knowledge.’

‘The combination of legal experience and industry knowledge is excellent. They also appear dedicated and polite in their work. If there are challenges, they are able to look for compromises which makes sense for all involved. In general, a very solution-oriented team.’

‘Extensive experience and knowledge of the aquaculture and fisheries industry.’

‘Mons Alfred Paulsen has a very good understanding of the industry and has extensive experience from having followed the development of the industry over several decades.’

Key clients

Mowi ASA

Lerøy Vest AS

Marø Havbruk A/S

Steinvik Fiskefarm AS

Kobbevik og Furuholmen Oppdrett AS

Erko Seafood AS

Flokenes Fiskefarm AS

Sulefisk AS

Blom Fiskeoppdrett AS

Svanøy Havbruk AS

Austevoll Melaks AS

E. Karstensen Fiskeoppdrett AS

Firda Sjøfarmer AS

Troland Lakseoppdrett AS

Eide Fjorbruk AS

Landøy Fiskeoppdrett AS

Sjøtroll Havbruk AS

Engesund Fiskeoppdrett AS

Tombre Fiskeanlegg AS

Sandnes Fiskeoppdrett AS

Nordfjord Laks AS

Fjord Drift AS

Osland Havbruk AS


Pelagia Holding AS


MSD Animal Health


NCE Seafood/The Seafood Innovation Cluster

DNB Bank

Nordea Bank

Hav Line Gruppen

Austevoll Seafood/ Br. Birkeland

Måsøval Fiskeoppdrett



Firda Seafood Group

Lingalaks AS



Langevåg Slakteri


Bluewild AS

Proximar Seafood

Ice Fish farm

Salmones Camanchaca

Polarsmolt AS

Work highlights

  • Advised a majority of the shareholders of NTS ASA on the successful sale of 50.1% of the shares in NTS to SalMar ASA, and advised NTS on the related voluntary offer made by SalMar for all shares in NTS.
  • Assisted Troland Lakseoppdrett AS, Austevoll Melaks AS and Langøylaks AS in the appeal to the Norwegian High Court in a case against the Norwegian Authorities regarding the withdrawal of pollution permits because of the discovery of cauliflower corals beneath an aquaculture site.
  • Advised Goldman Sachs Asset Management when funds it managed acquired the majority ownership stake in Frøy ASA.

Norway > Insolvency and corporate recovery Tier 1

Advokatfirmaet Thommessen AS fields a ‘uniquely qualified‘ practice, advising on financial restructurings, especially in the offshore, oil services and shipping industries. Practice head Kristoffer Hegdahl is an ‘extremely capable restructuring lawyer‘ with particular expertise in financial restructurings, financially distressed scenarios and workouts. Other notable practitioners include Halvor Mansåker, who works primarily with debt capital market transactions; Ellen Teresa Heyerdahl, who focuses on matters relating to bank and bond financings; and Frida Stene-Slotte, whose practice centres on debt capital market transactions and financial restructurings. Faraz Ahmed Ali, who ‘stands out and is always on top of all details’, primarily handles restructuring and insolvency matters within the shipping and offshore industries.

Practice head(s):

Kristoffer Hegdahl


‘Very strong team. Clearly one of the best in Norway on large scale restructurings.’

‘The Thommessen team is uniquely qualified and positioned to take on and tackle complex restructuring cases both on a national and international level. The team is large and diverse enough to entertain all aspects of a restructuring or an insolvency. The team co-operates seamlessly among themselves and with other Thommessen lawyers. The client responses are immaculate and always timely.’

‘Available for new projects on short notice. Good project management that secures progress. Precise legal advice. Must-have sense of humour.’

‘They are available and quickly get up to speed on ongoing cases. They secure progress and follow-up on projects. Advice is operational, and they are nice people.’

‘Thommessen covers all aspects of banking and finance, which is practical for us. They have some strong partners, but also some very, very strong senior lawyers and managing associates that really stand out and makes the team complete.’

‘Kristoffer Hegdahl is always on top of any matter he handles. He is very quick to grasp the issues and the strategic possibilities. Apart from the legal issues, he generally has a full understanding of the financial “puzzle” and develops sound and smart strategies. An extremely capable restructuring lawyer, in a class of his own in Norway.’

‘Frida Stene-Slotte is very smart, and handles both the legal and strategic sides of a restructuring/insolvency superbly. She is an invaluable part of the team, from the client perspective, due to her responsiveness and client follow up.’

‘Faraz Ahmed Ali stands out and is always on top of all details in a restructuring. He seems to be a key factor in the success of the Thommessen restructuring team and I hope we will see much more of him in the future.’

Key clients

Nordic Trustee (and bondholders committees)


Nordea Bank

Danske Bank


ABN Amro


The Export-Import Bank of China (CEXIM)


Export Finance Norway

Eksportfinans ASA



Danish Ship Finance

SpareBank 1 SR-Bank

Sparebank 1 Søre Sunnmøre

Sparebanken Møre

Skandinaviska Enskilda Banken (SEB)

MPC Containerships ASA




Recreate ASA

Volstad Maritime

Work highlights

  • Advising secured lenders of Solstad Offshore relating to a $1.5bn debt refinancing.
  • Advising Recreate ASA, a Norwegian retail company, on its restructuring process.
  • Advising a consortium of Norwegian banks in connection with the restructuring efforts of a listed Norwegian oil service company.

Norway > Insurance Tier 1

Advokatfirmaet Thommessen AS acts for national and international insurers on a wide range of insurance issues, such as D&O claims, pension insurance, reinsurance issues and regulatory work, and has notable expertise in the marine and offshore sectors. Practice head Andreas Meidell has ‘excellent skills and knowledge regarding insurance law‘ and focuses his practice on commercial insurance claims. The group also includes Henrik Hagberg, who is an oil services and shipping lawyer with extensive experience in contentious and non-contentious work; Trond Hatland, who regularly acts for major insurers; and Tore Mydske, who advises financial institutions on matters relating to financial services regulations. Emilie Falch Christensen is a key contact for shipping and marine insurance matters. Henrik Møinichen and Markus Kjelløkken are also notable practitioners alongside renewable energy and infrastructure project expert Henrik Fabian Torgrimsby.

Practice head(s):

Andreas Meidell


‘We are very satisfied with the lawyer Andreas Meidell. Him and his team have done a great job for us.’

‘Andreas Meidell has excellent skills and knowledge regarding insurance law and related matters.’

Key clients


Den norske Krigsforsikring for Skib (DNK)

Norwegian Hull Club (NHC)

Tryg Forsikring


UK Club








Travelers Companies Inc.


Storebrand Livsforsikring AS

Gjensidige Forsikring AS

Fremtind Forsikring AS

Finans Norge


Swedish Club

Brit Insurance

Equinor Insurance

Stadyard AS

Work highlights

  • Successfully defended insurers Chubb, QBE and Navigators in a direct action liability D&O claim of NOK1.7bn in Oslo City Court.
  • Successfully litigated an international arbitration on a reinsurance claim of approx. NOK240m.
  • Advising DNK on a total loss claim of $180m following a vessel detention for nine months in Nigeria.

Norway > Intellectual property Tier 1

Noted for its strength in patent, trade mark, and copyright disputes, Advokatfirmaet Thommessen AS also routinely advises clients on the IP aspects of transactions as well as regulatory matters. The team is overseen by Camilla Vislie, who focuses on contentious matters and is described by clients as ‘one of the most outstanding IP lawyers in Norway’. Eirik W Raanes is the key name for clients in the oil and gas, renewables, and entertainment industries, while ‘legal encyclopaediaMagnus Hauge Greaker also handles contentious mandates, representing clients in major patent litigation within the pharma, energy, and collective rights sectors. Julie Rasmussen Solli is praised for her ‘outstanding overview and understanding of the field‘.

Practice head(s):

Camilla Vislie


‘The IP team in Thommessen is highly skilled and professional, giving practical advice. I like working with them.’

‘I have worked with Camilla Vislie who is a very good lawyer and strategic adviser.’

‘Camilla Vislie is leading the IP department and she is, from a professional perspective, one of the most outstanding IP lawyers in Norway. In addition, Camilla is a sympathetic person who is very pleasant to work with.’

‘Eirik Raanes is an extremely valuable strategic adviser on complex matters. He quickly understands the core of the case and the business needs.’

‘Magnus Greaker is a legal encyclopaedia. He knows everything there is to know about the law, and has an overview of the details of the case that is impressive.’

‘Experienced and strong team. Covers all areas within IP.’

‘Julie Solli is experienced, has got an outstanding overview and understanding of the field. She always delivers beyond my expectations and is a great adviser within the whole IP field.’

‘What I value the most is Julie Solli’s in-depth knowledge of the consumer protection regulation, her ability to understand our business and the way she gives quick answers and assessments to complex questions.’

Key clients

Bristol-Myers Squibb

BioMar AS



Equinor ASA

Vianode AS

Dagens Næringsliv AS

AutoStore AS

Intervet International BV (MSD Animal Health)

Philip Morris International/Philip Morris Norway AS

Helsenor AS


Samsung Electronics Nordic AB

NorgesGruppen ASA

Norwegian Recording Artists Association NORA

Ferring Pharmaceuticals

TBL Licensing LLC

Den Norske Apotekforeningen (The Norwegian Pharmacy Association)

Optime Subsea AS


Komplett Group ASA

Work highlights

  • Counsel for Bristol-Myers Squibb in an appeal following patent litigation against Teva relating to a patent protecting Bristol-Myers Squibb’s ground-breaking drug Eliquis.
  • Representing Neuraxpharm and Laboratories Lesvi in patent infringement and validity litigation against Biogen relating to Biogen’s dosage patent concerning a treatment for MS.
  • Acted for TONO before the Supreme Court in a dispute against Oslo Philharmonic Orchestra regarding remuneration for the orchestra’s performance of works.

Norway > Maritime law Tier 1

Drawing on the firm’s notable strength in banking and finance, the ‘extremely hardworking and responsive‘ maritime practice at Advokatfirmaet Thommessen AS stands out for its expertise across the full range of transactional shipping and maritime work. Acting for owners, banks and syndicates, the team is especially active on Norwegian shipping transactions as well as refinancings and restructurings in the offshore supply sector. ‘Excellent partnersMads Haavardsholm and Henrik Hagberg jointly lead the team; Haavardsholm has a broad corporate shipping practice spanning vessel sales and purchases, shipbuilding contracts and charterparty negotiations, while Hagberg is the key name for cross-border transactions and dispute resolution in the space. Casualty work and marine insurance issues are handled by Andreas Meidell, and Ellen Teresa Heyerdahl is recommended for her ‘one-of-a-kind’ ship finance expertise.

Practice head(s):

Mads Haavardsholm; Henrik Hagberg


‘Thommessen stands out from the crowd.’

‘Strong understanding of complex shipping transactions and ability to find solutions to challenges.’

‘Extremely hardworking and responsive. Well connected in the global maritime financing space.’

‘We can always rely on Thommessen to provide us with excellent and timely advice. They have an industry knowledge which is unmatched, and are extremely reliable.’

‘Mads Haavardsholm and Henrik Hagberg are excellent partners in the shipping department.’

‘Ellen T Heyerdahl is one-of-a-kind in finance, with her unique combination of legal and industry knowledge. We can always rely on her to get the deal done or have broader strategy discussions.’

‘Thommessen has a great team of lawyers working for us. They have great competence, give us priority and quick response and in addition, they are great people to work with, with nice personalities. However first and foremost they are good lawyers who give us great advice.’

Key clients

Höegh Autoliners and Höegh LNG

Wilh Wilhelmsen Holding ASA/Wallenius Wilhelmsen ASA

Gard AS

Seaway 7 ASA

Pareto Securities AS

Island Offshore AS

Jo Tankers AS

Knutsen NYK Offshore Tankers ASA

Norwegian Hull Club

BW Maritime/BW Offshore/BW LPG

DeepOcean AS

Fearnley Advisors AS

TRF Ship Management AS

Amon Maritime AS

Belships ASA

Kongsberg Gruppen ASA

Gdansk Shiprepair Yard “Remontowa” SA

Tschudi Shipping Company

Hunter Group ASA

Odfjell SE



G2 Ocean




Viken Shipping

Arne Blystad AS

Western Bulk Charterering AS

Ocean Infinity

MPC Containerships ASA

Seadrill Offshore AS

Havfram Wind AS

Azane Fuel Solutions AS

Norwegian Hull Club – Gjensidig Assuranseforening

Gard AS

Solvang ASA

Arctic Securities AS

Work highlights

  • Representing Seadrill in a dispute concerning the redelivery of the rig “West Hercules” to SFL.
  • Assisted Norwegian insurers DNK and NHC in connection with cover considerations concerning vessels stuck in Ukraine after the outbreak of the war, including the sale of certain vessels being detained.
  • Assisted Havfram Wind with the entry into of a shipbuilding contract with Yantai CIMC Raffles Offshore Ltd for a second jack-up wind turbine installation vessel.

Norway > Offshore construction and shipbuilding Tier 1

Advokatfirmaet Thommessen AS advises on the full range of contentious and non-contentious work in the offshore and shipbuilding sector, counting shipyards, suppliers, rig owners, energy companies, and infrastructure operators among its impressive roster of clients. In particular, the team has seen a recent uptick in work related to the increase in energy prices and materials, as well as sanctions-related issues affecting the sector. Mads Haavardsholm oversees the team and focuses on corporate shipping matters, including the sale and purchase of vessels and drilling rigs, shipbuilding contracts, and drilling rig construction projects. Pål Lieungh advises Norwegian offshore energy companies undertaking international projects; Jacob F Bull is another key individual here. Kristine Hyldmo Bjørnvik leads on contentious issues and has extensive experience handling construction and contract disputes.

Practice head(s):

Mads Haavardsholm


‘I have not worked with any other law firm having the same knowledge of our business as Krisine Hyldmo Bjørnvik.’

‘The strong commitment from Kristine Hyldmo Bjørnvik is the main reason for using Thommessen. Her understanding for our business and our need is unique.’

‘Always switched on and up to date on industry matters.’

‘Jacob Bull – good on all aspects, and not just disputes but also complex contracting.’

‘The ability to combine the legal aspect with the overall commercial business cases.’

‘Overall commercial awareness – street smartness.’

Key clients

Equinor ASA

Myklebust Verft

DNO International ASA

Island Offshore/Borgstein

RAK Petroleum PLC

Enhanced Drilling AS


Kongsberg Gruppen


Viken Shipping

Gdansk Shiprepair Yard “Remontowa” S.A.

Vard Group AS

Fearnley Advisors AS/Transportation Recovery Fund

Apollo Asset Ltd/Hunter Group ASA

Arne Blystad/OHT ASA

Qatar Navigation – Milaha

Econnect Energy AS

Island Drilling AS

OHT Alfa Lift AS

TECO 2030 AS

Wellesley Petroleum AS

France Pelagique SAS

J.D. Irving, Limited / Atlantic Harrier Limited Partnership

Southern Wind Shipyards (PTY) Limited

Westcon Yards AS

Green Island Shipholding

Optime Subsea AS

Pareto Securities ASA

Vestfrakt Shipping AS

Vestland Shipping AS

Seadrill Offshore AS


Work highlights

  • Assisted AS Nymo with the contract negotiations of three key contracts with respectively Aker Solutions, NOV and Parat.
  • Assisted Havfram Wind AS with its order for a second self-elevating wind turbine installation vessel to be constructed at Yantai CIMC Raffles shipyard in China. Also assisting Havfram Wind on several tenders for installation work following delivery and technical and operational agreements in relation to the operation of two newbuilds.
  • Representing Seadrill in a dispute concerning the redelivery of the rig “West Hercules” to SFL in December 2023.

Norway > Real estate Tier 1

Leveraging the firm’s strength in M&A, corporate matters, and dispute resolution, the real estate department at Advokatfirmaet Thommessen AS is well-placed to advise clients across the full spectrum of contentious and non-contentious matters, handling lease and shareholder disputes, high-value transactions, commercial lease agreements, and property developments. ‘Very talented’ practice head Even Bratsberg takes point on high-value transactions, and also handles refinancings and restructurings, while Christopher Borch focuses on the purchase, sale, development, leasing, and syndication of commercial properties. The ‘extremely good’ Mette Borger Fyksen was promoted to the partnership in January 2023 and handles large property transactions for domestic and international clients. Managing associates Rolf Nyhus and Jenny Mo ably assist with large transactions, syndication projects, and commercial lease negotiations.

Practice head(s):

Even Bratsberg


‘I highly recommend Thommessen as a real estate law firm. Their expertise, experience, and dedication to the client’s needs make them a trustworthy partner for all types of property projects.’

‘Mette Borger Fyksen is always available to answer questions and provide advice, and she keeps clients updated throughout the process. Her professionalism and dedication to achieving the client’s goals makes her a reliable choice for anyone in need of legal assistance in real estate.’

‘Very competent in zoning and property development issues. Skilled, professional and likeable employees.’

‘Mette Borgen Fyksen is extremely good at project management. She has a sharp focus that goes down to every little detail in large, complex transactions, which makes it very reassuring to work with her.’

‘Christopher Borch is the best within real estate law in Norway in my opinion.’

‘Rolf Nyhus – He knows both me and our company, and our needs related to real estate/contract, so normally less intro is needed. Nyhus is very competent and polite, and generally a nice guy.’

‘Even Bratsberg is a very talented partner.’

‘Christopher Borch – The long-term partner with a great overview who gives you the best strategic advice. Jenny Mo – The experienced lawyer who sorts out any difficulties in the contract to make the deal go through.’

Key clients

Artic Securities AS

Clarksons Platou Real Estate AS

Nordic Real Estate Partners AS

Samhällsbygnadsbolaget i Norden AB

Norwegian Property ASA

Aspelin Ramm Eiendom AS

Starwood Capital Group

Watrium Eiendom AS

Promenaden Property AS

Scandinavian Property Group AS

Angelo Gordon


Oslo Airport City AS

Storebrand Eiendom

Axer Eiendom AS

Industrifinans Capital AS

Bulk Industrier AS

Mustad Eiendom AS

Geilo Holding AS

Glastad Farsund AS and Fortus AS

Vika Project Finance AS

Carucel Eiendom AS

Canica Eiendom AS

Eiendomshuset Malling & Co AS /Malling & Co Eiendomsfond AS

Tristan Capital Partners

Scandinavian Development Constructive Development AS

Norgesgruppen ASA

Bane NOR Eiendom AS

Avantor AS

Brødrene Jensen AS

Mont Investor AS

NRE Norway AS

HCH Eiendom AS

Njord Securities

Orkla Eiendom AS

Tellus Eiendom AS

Wahl Eiendom AS

Scala Eiendom AS

Ferd Eiendom AS

OroEiendom AS

Bakke Leiligheter AS

Mestergruppen Eiendom AS

Eiendomsspar AS

Asset Buyout Partners AS

Birk & Co AS

Carnegie AS

Neumann Bygg AS

Gjensidige Forsikring ASA

AMF Pensionsförsäkring AB

Indigo Management AS

Viken Park AS

Bo Coliving AS

EGD Property AS

GC Rieber Eiendom AS


Scandic Hotels AS

Fortin AS and Salmon TopCo AS

Work highlights

  • Advised Residential Holding AS/Union Residential Development in connection with the acquisition of all the shares in Bonava Norge AS from Bonava AB, a Swedish company listed on Nasdaq Stockholm.
  • Advised Scala Eiendom AS on the purchase of 100% of the shares in Citycon Down Town Eiendom AS and Citycon Sjøsiden Eiendom AS, owning the two shopping centres Down Town in Porsgrunn and Sjøsiden in Horten.
  • Advised Mustad Eiendom AS in connection with the ongoing efforts to realise the large-scale development of ‘Lilleakerbyen’ at Lilleaker in Oslo and Bærum municipalities.

Norway > Tax Tier 1

Advokatfirmaet Thommessen AS has ‘high legal competence in the tax field‘ and advises on all tax issues, with a focus on litigation, equity and debt capital markets work, joint ventures and fund establishments; the team also has particular expertise in the real estate, renewables, oil and gas, and shipping sectors. Leading the practice, Marius Holm Rynning focuses on Norwegian and international tax issues, while the ‘excellentFinn Backer-Grøndahl is an experienced litigator who represents Norwegian and foreign clients in tax disputes with Norwegian authorities, and Ståle R Kristiansen has extensive experience in a broad range of domestic and international tax issues, including advising on the Norwegian Petroleum Tax regime. The group also includes international shipping tax expert Espen Ommedal and indirect tax specialist Bjørn Christian Lilletvedt Tovsen.

Practice head(s):

Marius Holm Rynning


‘Very good in VAT. Professional lawyers with good business knowledge and understanding.’

‘They treat the customer in a respectful manner, see the needs and understand the customer’s business.’

‘They have high legal competence in the tax field. You know you will receive high-quality responses and advice. ’

‘Finn Backer-Grøndahl is an excellent lawyer. His knowledge, personality and his ability to go deep into the case is outstanding.’

Key clients

Fresenius Kabi



TGS NOPEC Geophysical Company ASA

Alcoa Corporation Inc



Odfjell SE

Sølvtrans AS

Intership AS

Westfal Larsen AS/ Masterbulk Pte Ltd.

Knutsen NYK Offshore Partners LP

GE Healthcare

PGNIG Upstream Norway AS

Elkem ASA

Work highlights

  • Assisted Sandwater AS in connection with its successful (up to NOK1.5m) fund raise.
  • Represented PGNiG Upstream Norway AS in a transfer pricing dispute regarding the pricing of gas in gas sales contracts between PGNiG group companies.
  • Provided support to Knutsen LNG AS in a French tax lease and the establishment of French shipowning structure.

Norway > TMT Tier 1

The ‘practical, hands-on and experienced‘ team at Advokatfirmaet Thommessen AS provides a market-leading offering with demonstrable strength and depth across several TMT areas, including the tech industry and data protection work. IT sourcing contracts and digital transformation projects feature prominently in the team’s workload, acting primarily for customer-side clients in the private sector. Christopher Sparre-Enger Clausen oversees the team and acts on a broad range of tech and data-related matters, including outsourcing, cloud services, and regulatory compliance work. Espen Werring focuses on digitisation matters, while Eirik W Raanes and Camilla Vislie are the key names for contentious IP mandates. At associate level, Nikolai Rekman and Kjetil Rikardsen handle IT sourcing and tech contracts, while Stian Karlsen is recommended for advisory services.

Practice head(s):

Christopher Sparre-Enger Clausen


‘The team is practical, hands-on and experienced.’

‘I think Christopher Clausen is really impressive.’

‘The team knows the business and industry, and they are easy to work with.’

‘Ane Lerheim Mossige has an incisive and pragmatic edge.’

‘Very good knowledge about market practice and excellent legal skills.’

‘Highly qualified, very good business understanding and excellent profile within the industry/sector.’

‘The best firm in Norway based on their many years of experience. They have broad experience with technology contracts and have specific advice to avoid pitfalls in the types of contracts.’

‘Very responsible and competent resource. Stian Karlsen is easy to work with, very professional with regard to advising us and extremely fast, providing what he promises to do.’

Key clients

Microsoft Corporation (including its Norwegian subsidiary, Microsoft Norge AS)

Samsung Electronics AB

AutoStore AS

Kahoot! AS


Otovo AS

Eika Gruppen

Elvia AS

Zalaris ASA

Casi AS


Varner AS

PatientSky Group AS

Dr. Dropin

Sparebank1 Gruppen

NHST Media Group AS (Dagens Næringsliv)

NomVec AS

Circle K Norge

Å Insite AS (formerly Glitre Energiløsninger)

Lyse Energi AS including its subsidiaries Altibox and Smartly

Diakonhjemmet Sykehus

The Norwegian Shipowners’ Mutual War Risk Insurance Association

Telenor Maritime AS

Vestland Fylkeskommune

Wilh. Wilhelmsen Holding ASA

Bolt Technology/Bolt Norway

Aksio InsureTech AS

Work highlights

  • Advised Nordea on the procurement of services and software to replace its existing core system with a new core system, and adjacent services.
  • Advised AutoStore on a wide range of legal and strategic matters, including contracts, IP matters and data protection.
  • Advised Circle K in connection with its joint venture with Schibsted relating to Elton car charging app.

Norway > Construction Tier 2

Advokatfirmaet Thommessen AS assists its clients throughout all stages of complex construction projects. Under the leadership of Jacob F Bull, an experienced arbitrator with a focus on energy, real estate and infrastructure-related construction mandates, the team attracts praise for its ‘consistently high availability and quality‘. Svein Aage Valen takes point on construction disputes from the firm’s Bergen office, while Kristine Hyldmo Bjørnvik has a strong track record representing clients in onshore and offshore construction disputes. At associate level, the ‘fantasticHenrik Fabian Torgrimsby and Alexander Stulien, praised for his ‘exceptional’ construction project experience, are other key names to note.

Practice head(s):

Jacob F Bull


‘Thommessen’s construction team is particularly strong on industrial knowledge and the ability to focus on the real business needs of the clients.’

‘Henrik Torgrimsby has been fantastic in terms of his legal counsel. He is pragmatic and solution orientated.’

‘Jacob Bull has outstanding knowledge on the valuable combination of construction law and industry experience.’

‘Alexander Stulien comes with exceptional practical experience from construction projects, in addition to a very strong knowledge of construction law.’

‘Consistently high availability and quality in running project support.’

‘Jacob F. Bull is very knowledgeable and great to work with.’

‘Jacob Bull: knowledge of our industry, and expertise on EPC contracts.’

‘Knowledge, straight to the point.’

Key clients

The Norwegian Public Road Administration / Statens Vegvesen


Vestland Fylkeskommune


Zephyr AS

Lyse Produksjon AS

The Norwegian Coastal Administration (Kystverket)

Odal Vindkraftverk AS/Akershus Energi Vind AS

Elvia AS

Sira-Kvina Kraftselskap DA

Watrium Eiendom AS

Mustad Eiendom AS

Agder OPS Vegselskap AS

Jølstra Kraft DA

Work highlights

  • Assisting FREYR with its multi billion USD project development activities in Norway, Finland and in the US.
  • Assisting Bane NOR with various matters related to the Follo line infrastructure project.
  • Representing Vestland County Authority in a comprehensive dispute against contractor YIT Infra Norge AS concerning the road project “FV 556 – Hjellestad”.

Norway > Public procurement Tier 3

The public procurement team at Advokatfirmaet Thommessen AS, which is a sub-department of the EU/EEA and competition law team, routinely acts on behalf of tenderers and contracting authorities in complex procurement damages claims, specifically within the utilities sector. The team is co-led by Oslo-based Eivind J Vesterkjær and Bergen-based Wenche Sædal, with Vesterkjær’s practice covering a broad range of industries including the life sciences, technology, energy, retail, and shipping sectors, and Sædal serving as adviser and litigator for prominent public and private clients. Åse Rieber-Mohn assists suppliers and public authorities with contentious and non-contentious procurement-related issues.

Practice head(s):

Eivind J Vesterkjær; Wenche Sædal

Other key lawyers:


‘I experience a very high degree of follow-up and commitment in connection with assignments. Very neat and structured, and with very good communication and plan for implementation through all the processes I have participated in.’

‘I would like to mention Wenche Sædal. Through our collaboration, she stands out as a reliable, proactive and good humoured partner, though razor sharp, which make her obviously attractive for potential customers.’

‘Worked with Wenche Sædal. She has a great ability to understand our needs and quickly understand the issues in our cases. She has an easy-going personality which makes cooperation pleasant and simple. Always available and handles issues in a short time.’

‘I believe Eivind Vesterkjær, Wenche Sædal and the team have an excellent touch on things and provide valuable and on the spot solutions.’

‘Eivind Vesterkjaer: outstanding practitioner and good insights and strong ability to find solutions. Wenche Sædal: is showing her true abilities and is a sharp legal profile that can get things happen.’

Key clients


Vestland fylkeskommune

Eviny AS and BKK Nett AS

Veidekke Industri AS

Skagerak Energi-group, including Skagerak Energi AS and Lede AS

Kystverket (Norwegian Coastal Administration)

Lyse/Lyse Lux/Lnett AS

Fagne AS

Ministry of Trade, Industry, and Fisheries

Stacc AS

BIR Bedrift AS

Unicare Norge AS

Bama Storkjøkken AS

Arval AS

Universitetet i Bergen

Apotek 1 Gruppen

Isalten Nett AS

Coloplast Norge AS

KODE Kunstmuseer og Komponisthjem

HCL Technologies Norway AS

Idrettens Helsesenter AS

Haugaland Kraft AS

Lockheed Martin Corporation

Bolt Services NO AS

SSI Diagnostica AS

Gyldendal AS

El-Proffen AS

Servicegrossistene AS

Å Energi AS

Lindum AS


Kongsberg Gruppen

Kromann Reumert

Work highlights

  • Served as Bane NOR SF’s strategic procurement adviser.
  • Awarded a contract through a public procurement process conducted by the Norwegian Ministry of Trade, Industry, and Fisheries to provide an analysis of Directive 2014/23/EU of the European Parliament and of the Council and formulating detailed proposals for the incorporation of the directive into Norwegian law.
  • Represented the Vestland County Administration in an interim injunction case brought against it by BMO Tunnelsikring AS.

Norway > Regulatory, compliance and investigations

Having revamped its compliance practice in early 2023, Advokatfirmaet Thommessen AS is establishing itself as a firm to watch in the space; the group continues to grow, with Hedvig Moe and Snorre Valdimarsson both joining in 2023.

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.

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.

Department Name Email Telephone
Managing Partner Sverre Tyrhaug +4723111330
Asset Management Marius Holm Rynning +4723111387
Banking and financing Ellen Teresa Heyerdahl +4723111329
Compliance and investigations Andreas Meidell +4723111304
Construction Jacob F Bull +4723111156
Data protection and cyber security Christopher Sparre-Enger Clausen +4723111141
Debt capital markets Einar Grette +4723111220
Dispute resolution Kristine Hyldmo Bjørnvik +4723111035
Employment Stein Kimsås-Otterbech +4723111174
Equity capital markets Solveig F Bugge +4723111199
EU/EEA and competition Siri Teigum +4723111121
Financial regulation Tore Mydske +4723111252
FinTech Christopher Sparre-Enger Clausen +4723111141
Fishery and aquaculture Mons Alfred Paulsen +4755306142
Insolvency and restructuring Kristoffer Hegdahl +4723111308
Insurance Andreas Meidell +4723111304
Intellectual property and marketing law Camilla Vislie +4723111178
Life sciences and health care Magnus Hauge Greaker +4723111147
M&A Christian Grüner Sagstad +4723111328
Oil and gas Christian Hals +4723111096
Oil service Pål Lieungh +4723111112
Private equity Christian Grüner Sagstad +4723111328
PropTech Christopher Sparre-Enger Clausen +4723111141
Public Procurement Wenche Sædal +4755306166
Real estate Even Bratsberg +4723111246
Renewable energy and infrastructure Bendik Christoffersen +4723111259
Retail/Consumer Markets Julie Rasmussen Solli +4723111123
Shipping Mads Haavardsholm +4723111242
Sustainability and climate risk Tore Mydske +4723111252
Tax and duties Finn Backer-Grøndahl +4723111103
Technology and digitalisation Espen A Werring +4723111493
Venture capital Ylva B. Gjesdahl Petersen +4723111105
Photo Name Position Profile
Thomas Abrahamsen photo Mr Thomas Abrahamsen Partner. Thomas is a corporate generalist attorney with substantial transaction experience, in…
Hans Cappelen Arnesen photo Mr Hans Cappelen Arnesen Mr Hans Cappelen Arnesen (“Hasse”) works primarily with matters concerning M&A, offerings…
Anders Arnkværn photo Mr Anders Arnkværn Partner. Mr Anders Arnkværn has long experience within the areas of M&A…
Ervin Auren photo Mr Ervin Auren Partner. Mr Ervin Auren works primarly with mergers, acquisitions and capital market…
Finn Backer-Grøndahl photo Mr Finn Backer-Grøndahl Partner. Mr Finn Backer-Grøndahl works with both national and international tax law…
Baard Bale photo Mr Baard Bale Partner. Mr Baard Bale focuses on, and has significant experience with, equity…
Stig Berge photo Mr Stig Berge Partner. Mr Stig Berge is one of Norway’s leading lawyers within corporate…
Christopher Borch photo Mr Christopher Borch Partner. Mr Chris Borch mainly works with purchase and sale, development, leasing,…
Even Bratsberg photo Mr Even Bratsberg Partner. Mr Even Bratsberg has twenty years of experience as lawyer in…
Solveig Fagerheim Bugge photo Mrs Solveig Fagerheim Bugge Partner. Mrs Solveig Fagerheim Bugge has extensive experience with M&A and capital…
Jacob F Bull photo Mr Jacob F Bull Mr Bull’s work mainly relates to offshore and onshore construction projects within…
Bendik Christoffersen photo Mr Bendik Christoffersen Mr Christoffersen works with matters concerning renewable energy and focuses on concession…
Tron Dalheim photo Mr Tron Dalheim Tron is a recognized employment law adviser to Norwegian and international companies.…
Ylva Gjesdahl Petersen photo Mrs Ylva Gjesdahl Petersen Ylva works with equity capital market transactions and M&A across various industries,…
Einar Grette photo Mr Einar Grette Mr Einar Grette’s practice focuses on financing and restructuring in the bank-…
Mads Haavardsholm photo Mr Mads Haavardsholm Mr Haavardsholm works primarily with contract negotiations and transactions towards clients in…
Henrik Hagberg photo Mr Henrik Hagberg Partner. Mr Henrik Hagberg has broad experience from working with both contentious…
Christian Hals photo Mr Christian Hals Partner. Christian works primarily with M&A and securities law within the oil…
Henning Harborg photo Mr Henning Harborg Mr Harborg assists clients from a wide range of business areas with…
Magnus Hauge Greaker photo Mr Magnus Hauge Greaker Partner Magnus mainly works with patent, trademark and trade secrets litigation, for…
Hans Haugstad photo Mr Hans Haugstad Mr Hans Haugstad predominantly works with financing transactions and assists both banks/financial…
Kristoffer Hegdahl photo Mr Kristoffer Hegdahl Partner. Kristoffer has extensive experience from domestic and cross-border financing transactions, acting…
Ellen Teresa Heyerdahl photo Mrs Ellen Teresa Heyerdahl Partner. Mrs Ellen Teresa Heyerdahl has extensive experience with financing. She assists…
Kristine Hyldmo Bjørnvik photo Mrs Kristine Hyldmo Bjørnvik Partner. Kristine mainly works with dispute resolution with a particular focus on…
Heidi Jorkjend photo Mrs Heidi Jorkjend Partner Heidi works with competition law and marketing law. She has broad…
Stein Kimsås-Otterbech photo Mr Stein Kimsås-Otterbech Mr Stein Kimsås-Otterbech has extensive experience with matters concerning employment law and…
Ståle R Kristiansen photo Mr Ståle R Kristiansen Mr Kristiansen advises several major Norwegian and foreign companies in connection with…
Pål Lieungh photo Mr Pål Lieungh Mr Lieungh has many years of experience as legal advisor within the…
Bjørn Christian Lilletvedt Tovsen photo Mr Bjørn Christian Lilletvedt Tovsen 2018-current Partner, Oslo office, Thommessen; 2015-2017 Managing Associate, Oslo office, Thommessen; 2012-2014 Senior…
Halvor Mansåker photo Mr Halvor Mansåker Mr Mansåker works primarily with debt capital market transactions, assisting both managers…
Gunnar Martinsen photo Mr Gunnar Martinsen A significant part of Mr Martinsen’s work is related to the conditions…
Andreas Meidell photo Mr Andreas Meidell Mr Meidell works mainly on commercial insurance claims and coverage issues, such…
Øyvind Mork Karlsen photo Mr Øyvind Mork Karlsen Partner Øyvind has long experience within Mergers & Acquisitions, and acts for…
Tore Mydske photo Mr Tore Mydske Mr Mydske advises financial companies with what is considered as regulated activity…
Reidar Myhre photo Mr Reidar Myhre Associate Partner. In recent years, Mr Myhre has been involved in several…
Mons Alfred Paulsen photo Mr Mons Alfred Paulsen Mr Paulsen primarily works with matters concerning tax and duty law as…
Eirik W Raanes photo Mr Eirik W Raanes Mr Raanes works primarily with dispute resolution within contract law, construction law,…
Lars Eirik Gåseide Røsås photo Mr Lars Eirik Gåseide Røsås Partner. Mr Lars Eirik Gåseide Røsås advises a number of listed companies…
Marius Holm Rynning photo Mr Marius Holm Rynning Partner. Mr Marius Holm Rynning primarily works with tax law and corporate…
Eivind Sæveraas photo Mr Eivind Sæveraas Associate Partner. Mr Sæveraas is primarily recognised for his work on several…
Christian Grüner Sagstad photo Mr Christian Grüner Sagstad Head of M&A and Corporate law department, Partner. Mr Christian Grüner Sagstad,…
Christopher Sparre-Enger Clausen photo Mr Christopher Sparre-Enger Clausen Partner. Christopher heads Thommessen’s Technology and Data Protection practice group and specialises…
Audun Stornes photo Mr Audun Stornes Partner. Audun primarily advises Norwegian and foreign companies within Oil and Gas…
Siri Teigum photo Mrs Siri Teigum Mrs Teigum acts as an advisor and litigator in procurement matters, and…
Sverre Tyrhaug photo Mr Sverre Tyrhaug Managing Partner. Mr Sverre Tyrhaug has advised on a number of share…
Eivind J Vesterkjær photo Mr Eivind J Vesterkjær Mr Vesterkjær’s practice focuses on matters relating to competition law, public procurement…
Camilla Vislie photo Mrs Camilla Vislie Mrs Vislie heads Thommessen’s IP and Technology practice. She works mainly with…
Espen Werring photo Mr Espen Werring Espen is a trusted adviser to organizations developing and implementing their mission-critical…
Number of lawyers : 290
at this office : 240
Norwegian Bar Association
Lex Mundi
Contact : Sverre Tyrhaug, managing partner (
Other offices : Bergen
Other offices : Stavanger
Other offices : London


A large and ever-expanding share of our activities are international in nature. We represent non-Norwegian businesses in Norway, as well as Norwegian businesses internationally, and have acted in some of the largest cross-border matters into and out of Norway in recent years. We have an office in London and an extensive network of international partners. 


Our lawyers have extensive international experience. This stems not only from the many international and cross-border matters that we handle, including litigation before international, courts, but also from work, secondment and studying abroad. 

Our experience and recognition enables us to work well with different international players. We are familiar with cultural diversities and standards, hence we are able to find the best solutions for our clients, also abroad. Thus, we are well placed to seamlessly obtain legal advice from foreign counsel in multi-jurisdictional projects or incidents. 


Thommessen’s London office is headed by Resident Partner Lars Eirik Gåseide Røsås, and has served as an important international market gateway for more than three decades. A large portion of our lawyers have been on secondments at our London office to gain international experience. 

Our London team have comprehensive experience in cross-border transactions, and Thommessen’s lawyers have argued numerous cases before international courts and tribunals. 


We are the Norwegian member of Lex Mundi; the world’s leading network of independent law firms. Membership provides valuable cross-border knowledge sharing, as well as direct access to leading law firms worldwide – for both us and our clients. 

We also have an extensive non-exclusive personal network enabling us to use other partners depending on the case at hand and the requirements of our clients.


Thommessen is perhaps best known for its handling of large and complex public and private M&A work and capital market transactions, involving multiple jurisdictions and often in combination with equity issues and debt financing of the transaction. 

Diversity Statement
Diversity and inclusion is a strategic priority for Thommessen. We are a company based on knowledge and expertise, where the most valuable asset is our employees. We acknowledge that there is room for improvement within diversity, and have therefore during the last seven years introduced a number of initiatives to increase diversity, some of which are described here.

We strive to be an attractive workplace and employer for everyone, regardless of gender, age, background, ethnicity, religion, physical capacity and sexuality. In our view, it is all about fostering an engaging teamwork culture where everyone feels included and valued.

At Thommessen, we have also recognized the importance of unconscious discrimination (bias). We have, among other things, structured the recruitment process and developed a recruitment tool together with an assessment and talent measurement company where we evaluate candidates against predefined characteristics identified through various personality and ability tests. Through this process, we reduce unconscious discrimination in the recruitment and selection process.

We have established a designated Women’s Committee, which supports the management in its efforts to improve our gender balance and increase retention of female lawyers. The Committee is also charged with facilitating female staff bonding by holding monthly lunches and other professional and social events.

In the current strategy period, we have chosen to continue to prioritize gender balance and multicultural diversity. Our strategy includes specific targets for increasing the proportion of women among our senior attorneys and partners in addition to employees with a minority background. In order to reach these targets, we have introduced a number of measures in relation to recruitment, management training, flexibility for staff with small children, etc.

At Thommessen, we believe that diversity and inclusion is best achieved through the day to day work, i.e. through the execution of the projects with our clients. We see that employees who experience that they gain knowledge, master their tasks and contribute in a meaningful way, tend to engage more, stay on longer and perform better, which again benefits the project. This is why we generally have a strong focus on building an open and including team culture.

Sponsorships and collaborations
At Thommessen, we seek, together with our clients, to shape the business sector of the future and to safeguard corporate values and the rule of law. Our social involvement is not only reflected in the work we do, but also through the NGOs we support. We support several ambitious CSR and pro bono initiatives. Knowledge is our key resource, and represents our main contribution to enabling NGOs to pursue their mission under optimum conditions.

I relations to our work with social diversity, we support several NGO’s and initiatives including:

  • The Norwegian Women’s Football Association
    From January 2020 Thommessen is official partner of the Norwegian Women’s Football Association. We want to take part in developing Norwegian women’s football, especially linked to increased professionalization and competence enhancement. At Thommessen we are committed to highlighting female talents – both in the legal profession and in football. The agreement allows the Norwegian Women’s Football Association to access a learning tool for football players based on VR technology, provided by Be Your Best.
  • #ShesGotThis / Equality Check
    #ShesGotThis is an organisation addressing gender stereotypes and unconscious bias. Thommessen is one of its founding partners, and we have assisted #ShesGotThis in a range of legal issues in its start-up phase. The organisation also serves as a key advisor in our efforts to increase our proportion of female managing associates and partners. The founders have also launched Equality Check, a community-based platform where employees can leave anonymous reviews about equal opportunity, company culture, work/life balance and the management’s commitment to diversity. Thommessen encourages all employees to leave their assessment of Thommessen.
  • Big Enough Global
    We are main partner with Big Enough Global (BEG). A youth organization that will work to create solutions within the UN’s sustainability goals, and which, among other things, works to promote the importance of multicultural diversity in the workplace, which is a strategic focus area for Thommessen.