[1][2] The firm has over 300 employees, with more than 200 lawyers and legal assistants and offices in Oslo, Bergen, Stavanger and London.
Thommessen specializes in stock exchange and transaction law, litigation and arbitration, as well as general business legal advice.
The company was founded on 19 January 1856, when Hans Christian Grønn established a private law practice in Oslo.
Grønn wanted to distinguish the legal profession from the civil service and fought to make business law more international.
[10] Thommessen is the Norwegian member of Lex Mundi, a leading worldwide network of independent, distinguished law firms.