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Thommessen is one of Norway's foremost commercial law firms, with offices in Oslo, Bergen, Stavanger, and London. They offer a full range of legal services to Norwegian and international businesses, public sector entities, and other organizations. Their expertise spans across various sectors including M&A, banking & finance, dispute resolution, EU/EEA and competition law, intellectual property, real estate, tax, and technology. Thommessen is known for its deep industry knowledge, client-centric approach, and commitment to providing high-quality, strategic legal advice.
Serves as the central hub for the firm's operations, client services, strategic management, and coordination of activities across all its offices and practice areas.
The Oslo office is situated in VIA, a landmark BREEAM Excellent certified modern office building in the Vika district, known for its contemporary architecture, sustainable design, and high-quality facilities fostering collaboration and innovation.
The work culture at Thommessen's HQ emphasizes professionalism, high ethical standards, collaboration, continuous learning, and a strong client focus. It is a dynamic and high-performance environment where lawyers and staff are encouraged to develop their expertise and contribute to the firm's success.
The Oslo headquarters is significant as it anchors Thommessen's presence in Norway's capital, a major center for national and international business, finance, and legal affairs. This prime location allows the firm to be in close proximity to key clients, regulatory bodies, and industry events.
While primarily focused on the Norwegian market with its core offices in Oslo, Bergen, and Stavanger, Thommessen maintains a significant international presence and capability through its London office. This office is crucial for supporting clients with cross-border transactions, international disputes, and accessing global capital markets. Furthermore, Thommessen actively collaborates with a network of leading independent law firms worldwide to provide seamless global legal services, ensuring comprehensive support for its clients' international business activities and legal needs.
Haakon VIIs gate 10
Oslo
Oslo
Norway
Address: Bradbenken 1, 5003 Bergen
To cater to the specific legal needs of the strong maritime, energy, and seafood sectors prevalent in Western Norway, offering local expertise with national and international reach.
Address: Ankerbygget, Skagenkaien 1, 4006 Stavanger
To support the vital energy sector (both traditional and renewable) and growing technology ecosystem in the Stavanger area, providing on-the-ground legal support and industry-specific knowledge.
Address: 40 Basinghall Street, London EC2V 5DE, United Kingdom
To act as a bridge between the Norwegian and international markets, particularly in finance, shipping, and cross-border transactions, leveraging London's status as a global financial and legal hub.
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As of April 2025, Thommessen' leadership includes:
Thommessen has been backed by several prominent investors over the years, including:
In the past 12 months, Thommessen significantly expanded its partnership by promoting seven lawyers to partner, effective January 2024. These appointments span various key practice areas, underscoring the firm's commitment to growth and recognizing internal talent. No major departures or hires at the highest executive levels (e.g., Managing Partner, Board Chair) have been publicly announced during this period.
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Thommessen primarily uses a three-letter initial code for employee email addresses (e.g., `abc@thommessen.no`). This format is consistently seen for partners and other staff on their official website. While less common for direct contact, the `firstname.lastname@thommessen.no` format might also exist or be routed internally.
`[initials]@thommessen.no` (typically 3 letters, e.g., `fml@thommessen.no`) and potentially `[first].[last]@thommessen.no`
Format
sty@thommessen.no (for Sverre Tyrhaug) or sverre.tyrhaug@thommessen.no
Example
90%
Success rate
Thommessen News • May 15, 2024
Thommessen provided legal counsel to Schibsted Nordic Marketplaces in connection with the divestment of its online job board Oikotie Työpaikat and real estate portal Oikotie Asunnot in Finland to Tietoevry Tech Services Oy. This transaction highlights Thommessen's M&A capabilities in the technology and media sectors....more
Thommessen News • May 2, 2024
Thommessen advised Nordic Solar, a Danish solar energy company, in securing a EUR 200 million capital raise from EIG. This funding will support Nordic Solar's expansion of its solar power project portfolio, underscoring Thommessen's expertise in renewable energy and project finance....more
Thommessen News • March 28, 2024
Thommessen received top-tier rankings across 14 practice areas in the Legal 500 EMEA 2024 edition. Additionally, 76 of the firm's lawyers were individually recognized, affirming Thommessen's leading position and excellence in the Norwegian legal market....more
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