LAWYER PROFILE
Siri Teigum

Siri Teigum

Europe 2026

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Ranked in 1 practice area

About

Provided by Advokatfirmaet Thommessen AS

Practice Areas

EU/EEA and Competition Law; Public Procurement; Dispute Resolution.

Siri heads Thommessen’s practice area of EU/EEA and Competition Law, including state aid and public procurement. She assists clients in negotiations and dispute resolution, and is top ranked within these areas. She has been responsible for the clearance of a number of complex mergers and acquisitions. She has handled different types of EEA and competition cases before the EFTA, CJEU and Norwegian courts. She also acts as an arbitrator. She is, among other things, leader of the board of The Government Pension Fund Norway and member of the board of Gyldendal ASA.

Career

1996-current: Partner, Oslo office, Thommessen; 1992-1996: Associate, Oslo office, Thommessen; 1989-1991: Advisor/secretary during EEA negotiatons, Legal Department, EFTA; 1988-1989: Higher Executive Officer, Legislation Department, Norwegian Ministry of Justice; 1985-1987: Research Assistant/Research Fellowship, Faculty of Law, University of Oslo.

Professional Memberships

Norwegian Bar Association

Personal

1987: Candidate in Jurisprudence, University of Oslo; 1985: EU Law, College dEurope.

Chambers Review

Provided by Chambers

Chambers European Guide

Competition/Antitrust - Norway

Band 1
Band 1

Individual Editorial

Siri Teigum stands out for her handling of contentious competition law matters, including representing clients in high-profile behavioural investigations and significant damages actions. She additionally assists clients with merger control filings, including those requiring phase II investigations.

Strengths

Provided by Chambers

  • Siri Teigum is very knowledgeable and experienced.

    Competition/AntitrustChambers European Guide
  • Siri Teigum is a fantastic competition lawyer.

    Competition/AntitrustChambers European Guide
  • Siri Teigum is the best hall of famer.

    Competition/AntitrustChambers European Guide
  • Siri Teigum is especially skilled at explaining complicated matters in a way that business people understand.

    Competition/AntitrustChambers European Guide

Ranked Individuals at Advokatfirmaet Thommessen AS (55)

Norway

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