Jan Magne Langseth heads the EU/EEA and Competition practice at Simonsen Vogt Wiig.

He has handled a broad range of competition cases before the Norwegian Competition Authority, the EFTA Surveillance Authority and the European Commission over a period of more than 20 years.

Merger control is a significant part of his practice, and he has been lead counsel in many complex merger cases. He is also one of Norway’s most experienced lawyers handling dawn-raids/investigations, leniency applications, dominance cases, and completion law litigation.

Jan Magne has managed many multi-national competition cases (anti-trust and mergers). He also deals with EU/EEA regulatory issues (free movement of services, capital, and establishment) and state aid, and has represented clients in a large number of cases before the Brussels authorities.

Clients comprise companies in the technology, grocery, retail, airlines, media, telecoms, energy, railway and mobility services, as well as transport sectors, often in cases that are critical to the clients’ business where he helps them make smart decisions.

He is consistently recommended as a leading competition law practitioner in Norway by the European Legal 500 and Chambers. He is ranked as a “global leader” for competition work by Who’s Who Legal/GCR.

Prior to joining private practice he also worked as a legal officer for the EFTA Surveillance Authority (ESA) in Brussels and has pleaded numerous cases before the Luxembourg courts, both in private practice and when working for ESA. In 2021 he was admitted to the Supreme Court.

Jan Magne has also advised major corporations in complicated corruption matters.

Selected recent merger control cases:

  • The acquisition of Statoil Fuel & Retail Marine by St1 (marine fuels business)
  • Telia’s takeover of Get/TDC (telecommunications, broadband, and TV-distribution)
  • Baneservice’s acquisition of Norsk Jernbanedrift (railway entrepreneur services)

Jan Magne Langseth is a state-of-the-art lawyer. Always pragmatic, giving high-stake advice and adding business value.

- Legal 500

The creative Jan Magne Langseth looks at things from different angles to find the best possible solutions.

- Chambers and Partners

Jan Magne stands out among peers for his expansive knowledge of competition law and meger proceedings.

- Who's Who Legal Competition


2014 - (today) Partner, Advokatfirmaet Simonsen Vogt Wiig AS
2004 - 2014 Partner, Advokatfirmaet Schjødt AS
2000 - 2003 Senior Lawyer, Advokatfirmaet Schjødt AS
1999 - 2000 Legal Officer, EFTA Surveillance Authority's Legal Service, Brussel
1996 - 1999 Senior Associate and Associate, Wiersholm, Mellbye & Bech Advokatfirma


2021 Admitted to the Supreme Court
1995 Cand. Jur., University of Oslo
1995 Studies in European Law (The Four Freedoms), Centre for European Law, University of Oslo
1993 Studies in European Law (Competition Law, Practice and Procedure before the European Courts and State Aid), University of Copenhagen
1988 Business Economist, BI Norwegian Business School


Competition Law, A Practitioner's Guide Langseth, J. M., Akademika forlag, 2014
Competition Law Chapter, Mathijsen's Guide to European Union Law Langseth, J. M., Sweet & Maxwell, 2013
EEA-law Chapter, Konkurrenceretten i EU Langseth, J. M., Jurist- og økonomforlaget, 2010