Tone Østensen has extensive experience as an advisor in capital market transactions, including stock exchange listings and public and private placements, and mergers and acquisitions. She also gives general advice on company law and stock exchange and securities law.

Ms. Østensen is ranked as one of Norway's most prominent experts on stock exchange and securities law in Chambers Global, Chambers Europe, IFLR 1000 and Legal 500. She is also ranked as one of Norway's leading lawyers on share issues and stock exchange listings in the Norwegian Financial Daily's annual lawyers survey.

Recent work highlights for Tone Østensen have related to rights issues, convertible bond offerings and voluntary incentive payment offers. Clients describe her as a "go-to person in Wiersholm".

Chambers Europe 2017


  • Ms. Østensen was head of the team that assisted Aqualis ASA in a NOK 700 million private placement, a NOK 100 million rights issue and a NOK 400 million bond loan to finance the acquisition of Weifa AS and the separation and listing of the company's offshore activities on the Oslo stock exchange.
  • Ms. Østensen was head of the team that assisted Carnegie AS and ABG Sundal Collier ASA in the listing of Scatec Solar ASA on the Oslo stock exchange.

Professional Experience

  • Partner, Wiersholm, 2000
  • Lawyer, Wiersholm, 1997
  • Lawyer, Oslo stock exchange, 1993-1997
  • Lawyer, Bugge, Arentz-Hansen & Rasmussen, 1990-1993
  • Trainee, Haight Gardner, Poor & Havens, 1989-1990
  • Deputy Judge, Indre Follo district court, 1988-1989
  • Lawyer, Bugge, Arentz-Hansen & Rasmussen, 1987-1988


  • Cand. jur., University of Oslo, 1986

Board Memberships

  • EMGS ASA, Board Member
  • Grieg Seafood ASA, Member of the Nomination Committee