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Thommessen

One of Norway's oldest commercial law firms — full-service M&A since 1856.

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About

Founded in Oslo in 1856, Thommessen is one of Norway's oldest commercial law firms, with around 320 lawyers and 415 staff across Oslo, Bergen, Stavanger and London. The full-service M&A practice advises Norwegian and international clients on domestic and cross-border transactions, with recognized strength in areas from aquaculture and shipping to renewables, real estate, technology, tax and competition. A member of the Lex Mundi global network.

Services

M&A counsel
Legal due diligence
Competition / antitrust
Tax structuring
Restructuring advisory

Specialisation

Generalist

Representative deals4

Legal adviser to Heimstø on the sale of its 70% stake in Måsøval to SalMar

SeafoodLegal adviser to the seller

NOK 3.4bn

2026

Norwegian law adviser to Nordic Leisure Travel Group and its shareholders on the sale to Norwegian Air Shuttle

ConsumerLegal adviser to the sellers

SEK 7.94bn

2026

Legal adviser to Statkraft Energi on the sale of its district heating business

EnergyLegal adviser to the seller

Undisclosed

2025

Legal adviser to Apollo Funds on the acquisition of Hav Energy LNG Holding from HitecVision

EnergyLegal adviser to the buyer

Undisclosed

2025

At a glance
Advisor typeLaw firm
Firm typeFull-service law firm
HeadquartersOslo
Founded1856
Deal segmentNOK 100m → NOK 1bn +
OfficesOslo, Bergen, Stavanger, London
CoverageInternational

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