Advokatfirmaet Thommessen AS


8 ranked lawyersBand 1NorwayEurope 2021 View ranking table
chambers review
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Ranked Lawyers
chambers review
department information
Ranked Lawyers

Chambers Review

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What the team is known for

Exceptional group handling a broad range of mergers, acquisitions and disposals. Expertise also includes public M&A and takeovers. Impressive reputation for IPOs. Has significant expertise in other ECM transactions such as private placements and rights issues. Often acts for private equity firms and financial institutions as well as companies from the energy, offshore and shipping sectors. Transactions frequently have cross-border elements.


Clients praise the firm's full-service capabilities: "It is one of the largest and broadest firms that can handle most requests and needs, particularly excelling in M&A and transactions."

Another client similarly states: "Thommessen is the most complete firm in Oslo in terms of having top-notch capacity across various fields of expertise, and is able to deliver all relevant expertise in a transaction in a seamless way."

Work highlights

Advised EQT Fund VII on its divestment of AutoStore to Thomas H. Lee Partners.

Notable practitioners

Anders Arnkværn is a highly acclaimed M&A practitioner highlighted for his expertise in both private and public transactions, including private equity mandates. He is also revered for his ECM practice, handling IPOs and share issues. Clients enthuse: "He is very on the ball. His core area of strength is his solution-oriented mindset; he has the expertise to find prime solutions."

Christian Sagstad enters the rankings this year as an up-and-coming practitioner. One client describes him as "a fantastic lawyer" who is "very available, very commercial and very quick to cut to the core of the question at hand and provide clear advice."He heads the corporate/M&A department and handles a broad range of public and private transactions, including private equity deals.

According to clients, Ervin Auren "is very strong in the field of M&A, and very easy to work with." He assists with corporate and transactional mandates, with interviewees appreciating his "pragmatic approach to problem solving."

One client enthuses that Hans Cappelen Arnesen "is the most experienced public M&A lawyer in Norway," highlighting his "to-the-point and good advice." He is universally revered for his market-leading expertise in public transactions and ECM mandates, particularly IPOs.

Solveig Fagerheim Bugge heads the capital markets department, frequently handling IPOs and listings. Clients say she is "pragmatic and has good knowledge about the rules and regulations regarding equity capital markets."

Managing partner Sverre Tyrhaug has considerable experience in equity capital markets transactions, including share issues and IPOs.

Department Information

This content is provided by Advokatfirmaet Thommessen AS.


Thommessen's mergers & acquisition practice has year after year been leading the market. Our full-service M&A practice advises on the whole range of mergers and acquisitions, from private M&A transactions to public M&A transactions. We stay continually at the forefront, in terms of both the number and value of deals.

Mergers and acquisitions are essential to create a healthy and competitive business environment. The buyer gets access to new technology, expertise or a new industrial or geographic market, while the seller can focus on developing its core business or reallocate its investment. Successful transactions create blooming businesses that grow and increase their profitability. 

We have expertise in all fields that may be affected by a transaction. We regularly advise on the largest M&A projects in the market, using our proprietary project management model and cutting-edge technology to improve processes and deliver exceptional results to clients.

Thommessen advises large, medium-sized and small companies across all industries, private equity firms, family offices and investment banks. We are involved in strategic assessments, negotiations, closing and implementation of a wide range of domestic and cross-border mergers and acquisitions.


Grüner Sagstad, Christian (Head of Department)

Arnesen, Hans Cappelen

Berge, Stig

Bratsberg, Even

Clausen, Christopher Sparre-Enger

Fagerheim Bugge, Solveig

Fagerheim Bugge, Solveig

Gåseide Røsås, Lars Eirik

Greve, Jan

Hals, Christian

Hatland, Trond

Holm Rynning, Marius

Karlsen, Øyvind Mork

Kristiansen, Ståle R

Lindal, Hans Olav

Mansåker, Halvor

Tyrhaug, Sverre

Ulriksen Steinsland, Rune


Aerospace & Defence



Construction & Materials


Financial Services

Food & Drink Producers


Health Care

Industrial Engineering



Mining & Metals

Pharmaceuticals & Life Sciences

Real Estate

Real Estate Finance


Software & Computer Services




Corporate/M&A Department

Advokatfirmaet Thommessen AS

Department location

Haakon VIIs Gate 10

PO Box 1484 Vika





View Firm Profile

Ranked Lawyers

Chambers Research is conducted by 200 Research Analysts, across 200 jurisdictions and provides nearly 6,000 rankings tables. Annually we collect hundreds of thousands of responses from clients, the majority via in-depth interview. Learn more about our methodology.


Capital Markets: Equity

Anders Arnkværn
Band 1
Hans Cappelen Arnesen
Band 1
Solveig Fagerheim Bugge
Up and Coming
Sverre Tyrhaug
Eminent Practitioners


Anders Arnkværn
Band 1
Christian Sagstad
Up and Coming