
With a well-established client roster including offshore yards, E&P companies, suppliers, and shipowners, Advokatfirmaet Thommessen AS assists clients across contentious and non-contentious work. The department is under the leadership of the seasoned Jacob F Bull, a regular advisor to developers on complex development projects, and Pål Lieungh, a key port of call for domestic companies acting on international projects. Mads Haavardsholm adds expertise in the oil service sector, advising on the sale and purchase of drilling rigs, corporate transactions, and the construction of drilling rigs. Audun Stornes has experience representing E&P companies in disputes relating to rig modifications.
Legal 500 Editorial commentary
Accolades
Client satisfaction: Sector knowledge
Client satisfaction: NPS ®
Testimonials
Collated independently by Legal 500 research team.
- ‘Outstanding team for project advisory and dispute resolution in large development projects. The team stands out with high quality on all levels, from partners to associates. Very good understanding of the industry and commercial drivers that are important for success.’
- ‘Jacob F Bull is unmatched when it comes to experience from advising on large development projects.’
- ‘They have people onboard for very long durations - solid firm. They are always involved in high-profile cases and only do complex work.’
- ‘One of Thommessen’s key strengths lies in their ability to assemble multidisciplinary teams that combine broad legal expertise with deep sector-specific knowledge.’
- ‘Audun Stornes has a unique ability to grasp complex legal and commercial issues, and to identify critical interdependencies across subject areas that are essential for comprehensive legal guidance.’
Key clients
- Equinor ASA
- DNO International ASA
- Island Offshore/Borgstein
- ConocoPhillips
- Kongsberg Gruppen
- AS Nymo
- Viken Shipping
- Vard Group AS
- Fearnley Advisors AS/Transportation Recovery Fund
- Apollo Asset Ltd/Hunter Group ASA
- Qatar Navigation – Milaha
- Econnect Energy AS
Work highlights
Assisting AS Nymo on several ongoing offshore construction projects.
Assisted Amon Maritime with the establishment of a joint venture with Navigator Gas and in the contract negotiations with Nantong CIMC Sinopacific Offshore & Engineering Co., Ltd. for the construction of two ammonia fuelled gas/ammonia carriers.
Assisted Green Island Shipholding AS with securing the delivery of the vessel Island Ocean from Myklebust Verft AS.
Lawyers
Hall of Fame
The lawyers at the very top of the profession, widely known and respected by peers and clients for their longstanding involvement in market-leading work.

Practice head
Jacob F Bull; Pål Lieungh
Other key lawyers
Emilie Falch; Mathilde Rye Ramberg; Audun Stornes
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