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Key contacts
Managing Partner: Sverre Tyrhaug
Partner: Hans Haugstad
Partner: Lars Eirik Gåseide Røsås
Partner: Hans Cappelen Arnesen
Quick facts
Number of lawyers

275

Number of partners

63

Network memberships

Lex Mundi

Languages

Norwegian, Danish, Swedish, English, Dutch, German, French

Key practice areas
Banking and finance
Capital markets
Capital markets : Debt
Capital markets : Equity
Financial and corporate
M&A
Energy and infrastructure
Project development
Firm overview

Established in 1856, Thommessen is considered to be one of Norway’s leading commercial law firms. The firm has offices in Oslo, Bergen, Stavanger and London. The firm provides advice to Norwegian and international companies as well as organisations in the public and private sectors, ranging from SMEs to large multi-national corporations. Thommessen covers all business related fields of law.

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

Key transactional practices
  • Banking and finance
  • Capital markets
  • Competition/antitrust
  • Construction
  • Corporate and M&A
  • Dispute resolution
  • Regulatory
  • Intellectual property
  • Labour and employment
  • Investment funds
  • Private equity
  • Restructuring and insolvency
  • Tax
Address:
Ruseløkkveien 38
0251 Oslo
PO Box: Postboks 1484 Vika
Tel:+47 2311 1111 Fax:+47 2311 1010 Email:Contact Us Web Address:http://www.thommessen.no/en/
2026 Edition
Banking and finance
Tier 1
14 firms ranked
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Tier 1

BAHR
8 practice areas
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Thommessen
8 practice areas
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Wiersholm
8 practice areas
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Wikborg Rein
7 practice areas
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Tier 2

Arntzen Grette
8 practice areas
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Schjødt
8 practice areas
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Simonsen Vogt Wiig
8 practice areas
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Tier 3

Haavind
8 practice areas
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Selmer
8 practice areas
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Tier 4

CLP
8 practice areas
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CMS Kluge
6 practice areas
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DLA Piper
3 practice areas
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SANDS
7 practice areas
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Notable

Kvale
4 practice areas
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Capital markets : Debt
Tier 1
10 firms ranked
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Tier 1

BAHR
8 practice areas
View full profile
Thommessen
8 practice areas
View full profile
Wiersholm
8 practice areas
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Wikborg Rein
7 practice areas
View full profile

Tier 2

Arntzen Grette
8 practice areas
View profile
Schjødt
8 practice areas
View profile

Tier 3

Selmer
8 practice areas
View profile
Simonsen Vogt Wiig
8 practice areas
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Notable

Haavind
8 practice areas
View full profile
SANDS
7 practice areas
View full profile
Capital markets : Equity
Tier 1
12 firms ranked
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Tier 1

BAHR
8 practice areas
View full profile
Schjødt
8 practice areas
View profile
Thommessen
8 practice areas
View full profile
Wiersholm
8 practice areas
View full profile
Wikborg Rein
7 practice areas
View full profile

Tier 2

CLP
8 practice areas
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Haavind
8 practice areas
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Selmer
8 practice areas
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Simonsen Vogt Wiig
8 practice areas
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Tier 3

Arntzen Grette
8 practice areas
View profile

Notable

AGP Advokater
3 practice areas
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SANDS
7 practice areas
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M&A
Tier 1
16 firms ranked
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Tier 1

BAHR
8 practice areas
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Schjødt
8 practice areas
View profile
Thommessen
8 practice areas
View full profile
Wiersholm
8 practice areas
View full profile
Wikborg Rein
7 practice areas
View full profile

Tier 2

CLP
8 practice areas
View profile
Haavind
8 practice areas
View full profile
Selmer
8 practice areas
View profile

Tier 3

Arntzen Grette
8 practice areas
View profile
DLA Piper
3 practice areas
View profile
Simonsen Vogt Wiig
8 practice areas
View full profile

Tier 4

AGP Advokater
3 practice areas
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Aabø-Evensen & Co
7 practice areas
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CMS Kluge
6 practice areas
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SANDS
7 practice areas
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Notable

Kvale
4 practice areas
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Project development
Tier 1
13 firms ranked
View full list

Tier 1

BAHR
8 practice areas
View full profile
Haavind
8 practice areas
View full profile
Schjødt
8 practice areas
View profile
Thommessen
8 practice areas
View full profile
Wiersholm
8 practice areas
View full profile
Wikborg Rein
7 practice areas
View full profile

Tier 2

Arntzen Grette
8 practice areas
View profile
CMS Kluge
6 practice areas
View profile
Selmer
8 practice areas
View profile
Simonsen Vogt Wiig
8 practice areas
View full profile

Tier 3

CLP
8 practice areas
View profile
Kvale
4 practice areas
View profile
Lund & Co
2 practice areas
View profile
Linked Reviews
Financial and corporate
Thommessen is a leading Norwegian law firm with offices in Oslo, Bergen, Stavanger and London. The firm’s history stretches back to 1856. The firm is highly ranked across all areas of financial and corporate law. The firm has a strong focus in banking, technology and renewable energy. This year, the banking team, led by Hans Haugstad, assisted the lenders with the refinancing of all bank debt of Entra. The transaction was the first known platform refinancing completed by a Norwegian real estate company. The projects team, led by Bendik Christoffersen, advised Nordkraft in the development of the ‘Powered Land’ concept, which is now being used by Aker, Nscale, and OpenAI in the laurnch of ‘Stargate Norway,’ an advanced AI infrastructure project. Key clients of the firm include DNB Bank, Nordea Bank, Danske Bank, Svenska Handelsbanken, Skandinaviska Enskilda Banken, DNB Markets, Pareto Securities, ABG, Clarksons, DOF Group, Kongsberg Gruppen, Goldman Sachs, ABG Sundal Collier, Arctic Securities, Northern Lights JV, RSK DA, Hydrogen Solutions, Heidelberg Materials, and Nordkraft.

Testimonials
‘They provide a knowledgeable, hands-on team to assist with all aspects of a matter.’ (Banking & Finance)
‘They are broad full-service team that always deliver quality and in time. The most experienced law firm on high yield transactions.’ (Capital Markets)
‘Swift and knowledgeable.’ (Capital Markets)
‘We appreciate their comprehensive delivery of all relevant services in both M&A and ECM; superior experience with Norwegian capital markets; and ability to assess market reactions from an investor point of view as well as regulatory concerns.’ (Capital Markets)
‘They demonstrate excellent expertise in EU regulation, EUlevel supervisory and policy practice (including the EBA and the European Commission), as well as in domestic interpretation and supervisory practice by the Norwegian FSA. They also have a strong understanding of how banks operate in practice and of the operational impact that different regulatory interpretations may have on banks’ daytoday activities.’ (Financial Services Regulatory)
‘The firm has a strong power and utilities team; is knowledgeable about our business; and has strong M&A experience.’ (M&A)
‘The team has a personal touch, but at the same time is highly professional.’ (M&A)
‘Highly qualified, expedient, and trustworthy.’ (M&A)
‘We appreciate them adding new suppliers and consultants with relevant knowledge to the project.’ (Project Development)
‘We value access to Thommessen's expertise and network in industry and finance, which is really key to finding the right structures and deals that create value for the long term.’ (Project Development)
Ellen Teresa Heyerdahl is a very good discussion partner, who is very knowledgeable. She understands the industry and is good at understanding the client's needs.’ (Banking & Finance)
Frida Stene Slotte is professional and experienced.’ (Capital Markets)
Elinar Grette is diligent and delivers on time.’ (Capital Markets)
Hans Cappelen Arnesen is very experienced and trusted among all clients. When he appears on your side, everyone relaxes.’ (Capital Markets)
Anders Arnkværn understands capital market extremely well and understand the client's needs and priorities - a wonderful advantage when dealing with contract negotiations.’ (Capital Markets)
Anders Arnkværn is sharp, experienced, service minded.’ (M&A) 
Anders Arnkværn is a trusted advisor with an ability to understand the financial aspects.’ (M&A)
Mons Alfred Paulsen is very experienced, in particular in some of the most important industries in Norway. He enjoys great respect in his field of business.’ (Capital Markets)
Jørgen Keiserud always demonstrates outstanding expertise and deliver work both efficiently and promptly. Moreover he shows a strong ability to assess the scope of the assignment and the legal issues at stake.’ (Financial Services Regulatory)
Tore Mydske offers an excellent understanding of, and a comprehensive overview of, the key legal issues facing the banking sector. As a partner, he maintains close oversight of all legal assignments while demonstrating strong leadership through effective delegation to his large and highly skilled team of lawyers. He also has strong social skills.’ (Financial Services Regulatory)
Marcus Kjelløkken possesses an excellent and welldeveloped understanding of the legal challenges facing the banking sector. As his colleagues, he has a strong overview of complex matters.’ (Financial Services Regulatory)
Morten Coward Linstad is very knowledgeable about our business and the power and utilities sector; is always available to provide advice when needed; has fast delivery; and is a very nice person.’ (M&A)
Mette Borger Fyksen is high quality, commercially strong, and has an excellent ability to close deals.’ (M&A)
Ståle Kristiansen is skilled, focused, and to the point.’ (M&A)
Hans Haugstad is a trusted advisor with an ability to understand the client's needs.’ (M&A)
Henrik Torgrimsby is very proactive and costumer focused. He is extremely competent in the renewables business.’ (Project Development)
Marte Fossan Tingstad is skilled in her area of expertise.’ (Project Development)
Snorre Valdimarsson has the rare combination of solid industrial and legal know how and brings that over to us as his client in an extraordinary good way.’ (Project Development)
Vilde Ueland works efficiently, is responsive and cares about her client.’ (Project Development)
22 results22 results
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Deal Highlights
54 results54 results
Deal Name Deal Date Firm Name Jurisdiction Deal Type Lawyer Names Client Names Client Role
Kongsberg Gruppen ASA - Bond Issue
2021-02-01
Thommessen
Norway
Bond issue
Kongsberg Gruppen ASA
Issuer
Lundin Energy AB - Bond Issue
2021-07-01
Thommessen
Sweden
Bond issue
Raiffeisen Bank SA, Groupe BPCE, BMO Capital Markets, Barclays, UniCredit, BNP Paribas, Danske Bank Corporate Finance, Wells Fargo, Deutsche Bank, SEB - Skandinaviska Enskilda Banken AB, DNB Bank ASA, ING Bank, ICBC, Nordea, Scotiabank
Underwriter
Norwegian Property ASA - Bond Issue
2021-06-01
Thommessen
Norway
Bond issue
Norwegian Property ASA
Issuer
Storebrand Boligkreditt AS - Bond Issue
2021-02-01
Thommessen
Norway
Bond issue
Storebrand Boligkreditt AS
Issuer
Kenbourne Invest SA - Bond Issue
2021-01-01
Thommessen
Luxembourg
Bond issue
Kenbourne Invest SA
Issuer
Verisure MidHolding AB - Bond Issue
2021-03-01
Thommessen
Sweden
Bond issue
Verisure MidHolding AB
Issuer
Axo Finans AS - M&A
2021-06-17
Thommessen
Denmark
M&A
Axo Finans AS
Buyer
Sbanken ASA - M&A
2021-04-15
Thommessen
Norway
M&A
Sbanken ASA
Seller
Ocorian Ltd. - M&A
2021-06-25
Thommessen
Norway
M&A
Ocorian Ltd.
Buyer
Storebrand Livsforsikring AS - M&A
2021-12-20
Thommessen
Norway
M&A
Storebrand Livsforsikring AS
Buyer
Hafnia Ltd. - M&A
2021-11-11
Thommessen
Marshall Islands
M&A
Hafnia Ltd.
Buyer
Larus Holding Ltd. - M&A
2021-03-08
Thommessen
Norway
M&A
Larus Holding Ltd.
Buyer
Kalera Inc. - M&A
2022-01-31
Thommessen
United States (National)
M&A
Kalera Inc.
Target
eBay Inc. - M&A
2021-07-14
Thommessen
Norway
M&A
Hans Arnesen, Nanette Arvesen, Ylva Petersen
eBay Inc.
Seller
Nationwide Building Society - Bond Issue
2021-10-01
Thommessen
United Kingdom
Bond issue
Nationwide Building Society
Issuer
Partners Group AG - M&A
2022-01-31
Thommessen
Norway
M&A
Partners Group AG
Buyer
Mercell Holding ASA - M&A
2022-05-25
Thommessen
Norway
M&A
Mercell Holding ASA
Target
Blockchain Moon Acquisition Corp. - M&A
2022-10-15
Thommessen
Norway
M&A
Blockchain Moon Acquisition Corp.
Buyer
Play Magnus AS - M&A
2022-08-24
Thommessen
Norway
M&A
Play Magnus AS
Target
Seadrill Ltd. - M&A
2022-12-23
Thommessen
United Kingdom
M&A
Seadrill Ltd.
Buyer
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