Department profile
Advokatfirmaet Thommessen AS

Corporate/M&A

Global Guide 2026 : Norway

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Advokatfirmaet Thommessen AS

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About

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.

Industries (21)

  • Aerospace & Defence
  • Banks
  • Chemicals
  • Construction & Materials
  • Energy
  • Financial Services
  • Food & Drink Producers
  • Government
  • Health Care
  • Industrial Engineering
  • Insurance
  • Media
  • Mining & Metals
  • Pharmaceuticals & Life Sciences
  • Real Estate Finance
  • Real Estate
  • Retail
  • Software & Computer Services
  • Telecommunications
  • Transportation
  • Utilities

Chambers Review

Provided by Chambers

Corporate/M&A - Norway

Band 1

What the Team is Known For
Thommessen possesses an exceptional corporate law group handling a broad range of mergers and acquisitions. The law firm's expertise includes public M&A and takeovers. It has an impressive reputation for ECM transactions such as IPOs, private placements and rights issues. The law firm often acts for private equity firms and financial institutions on transactions involving cross-border elements.
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Work Highlights

Provided by Chambers

  • Thommessen acted for DNB on its acquisition of Carnegie Investment Bank from Altor.

Strengths

Provided by Chambers

  • The firm is always available, with quick responses and value-adding support.

    Corporate/M&A respondentGlobal

  • The firm takes a pragmatic approach to challenges and is good at finding alternatives and recommends solutions.

    Corporate/M&A respondentGlobal

  • The firm is very hands-on, prioritises the client and solves problems.

    Corporate/M&A respondentGlobal

  • Thommessen consistently brings deep legal expertise, strong deal execution capabilities and excellent project management to the table.

    Corporate/M&A respondentGlobal

  • The firm has the ability to put together a seamless team covering all aspects of a transaction.

    Corporate/M&A respondentGlobal

Notable Practitioners

Provided by Chambers

  • Anders Arnkværn
    Anders Arnkværn

    Anders Arnkværn

    Anders Arnkværn is a highly acclaimed M&A practitioner highlighted for his expertise in both private and public transactions, representing clients in the energy and financial services sectors. He is also revered for his ECM practice, handling rights offerings and private placements.

    • Anders Arnkværn has strong expertise.

      Corporate/M&A respondentGlobal

    • Anders is very experienced and always brings value. He is the perfect adviser.

      Corporate/M&A respondentGlobal

    • Anders is impressive and can deliver top quality for everything, from SMEs to large things.

      Corporate/M&A respondentGlobal

    • He is a highly skilled lawyer who understands the client's needs.

      Corporate/M&A respondentGlobal

    • He understands the client very well, is highly engaged and drives processes effectively. He is alert and present at all stages.

      Corporate/M&A respondentGlobal
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  • Hans Cappelen Arnesen
    Hans Cappelen Arnesen

    Hans Cappelen Arnesen

    Hans Cappelen Arnesen is universally revered for his market-leading expertise in private and public M&A transactions. He is also highly experienced in ECM mandates such as private placements, and frequently acts for technology companies.

    • He offers the best advice and the most recent market practices.

      Corporate/M&A respondentGlobal

    • We feel super comfortable working with Hans on ECM deals. We feel like we get the best advice and the most recent market practice guidance from him.

      Corporate/M&A respondentGlobal

    • He is a leading lawyer in his market.

      Corporate/M&A respondentGlobal

    • He is one of Norway's top lawyers.

      Corporate/M&A respondentGlobal
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  • Christian Grüner Sagstad
    Christian Grüner Sagstad

    Christian Grüner Sagstad

    Christian Grüner Sagstad heads the law firm's transaction department and handles a broad range of mergers and acquisitions.

    • Christian is solution-oriented, committed and responds rapidly.

      Corporate/M&A respondentGlobal

    • He combines deep legal expertise with strong commercial understanding, and consistently provides clear, pragmatic and actionable advice.

      Corporate/M&A respondentGlobal

    • He is the most responsive lawyer in Norway and adds significant value in every transaction he leads.

      Corporate/M&A respondentGlobal

    • He is a strong Norwegian M&A practitioner.

      Corporate/M&A respondentGlobal

    • Christian Grüner Sagstad has incredible bandwidth.

      Corporate/M&A respondentGlobal
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  • Solveig Fagerheim Bugge
    Solveig Fagerheim Bugge

    Solveig Fagerheim Bugge

    Solveig Fagerheim Bugge is an experienced practitioner in the ECM sphere. She handles IPOs, rights issues and private placements.

    • She is experienced and up to date with new regulations. She is always a good discussion partner.

      Corporate/M&A respondentGlobal

    • Solveig Fagerheim Bugge is skilled.

      Corporate/M&A respondentGlobal

    • Solveig is an excellent partner who is commanding and pragmatic.

      Corporate/M&A respondentGlobal

    • She is not afraid to communicate what she really means.

      Corporate/M&A respondentGlobal
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  • Ylva B. Gjesdahl Petersen
    Ylva B. Gjesdahl Petersen

    Ylva B. Gjesdahl Petersen

    Ylva Gjesdahl Petersen is experienced in equity capital markets mandates including private placements and voluntary takeovers.

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  • Lars Eirik Gåseide Røsås
    Lars Eirik Gåseide Røsås

    Lars Eirik Gåseide Røsås

    Based in Thommessen's London office, Lars Eirik Gåseide Røsås regularly advises on multi-jurisdictional M&A and ECM mandates. His areas of expertise include large cross-border public takeovers as well as IPOs, private placements and listings. He has experience acting for clients in the energy, banking and shipping sectors.

    • He is an exceptional corporate and capital markets lawyer. He has a very sharp mind and always keeps calm.

      Corporate/M&A respondentGlobal

    • Lars Eirik Gåseide Røsås is outstanding.

      Corporate/M&A respondentGlobal
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Ranked Individuals at Advokatfirmaet Thommessen AS (9)

Norway

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Advokatfirmaet Thommessen AS has rankings in the following guides

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