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Joachim Ørum Petersen

Partner and Attorney

Practice area

Corporate Law
Mergers & Acquisitions
Real Estate


Phone (+45) 88 88 85 05 Mobile (+45) 28 26 31 55 Email jop@siriusadvokater.dk
Legal Secretary: Samantha Milt
(+45) 88 88 85 55


Joachim advises Danish and international clients in the field of corporate law, mergers and acquisitions and commercial real estate development.

Over the past several years, Joachim has acted as a trusted advisor to a large number of clients, and he has also been a member of the board of directors in various business enterprises.

In recent years, Joachim has advised buyers and sellers in a large number of business transactions and major real estate transactions, generally as the lead partner on the transaction and as head of SIRIUS advokater’s Corporate and M&A team.

Joachim is known for being an experienced and skilled negotiator who is always focused on ensuring the right process for the solution through coordination and alignment of expectations with all parties involved to ensure a flexible transaction process and a high success rate.

Joachim has a large network in all aspects of real estate, including contacts with banks and developers, which Joachim proactively uses together with his detailed commercial knowledge to the benefit of his clients.


  • SIRIUS advokater: 2006-current


For a period of three years, Joachim has been an external lecturer in the law of contracts and tort at the University of Copenhagen.

In recent years, Joachim has been a speaker at various seminars and after-work/morning meetings on various topics relating to corporate law and mergers and acquisitions.


For the past several years, Joachim has been chairman or member of the board of directors of several business enterprises.

Joachim is a member of the board of directors of SIRIUS advokater.


Joachim has been recommended as a competent and experienced negotiator by The Legal 500 within corporate law, company acquisitions and real estate.

  • Quote from Legal500 2020: “Joachim Ørum Petersen is very experienced and competent within Commercial contracts and Corporate law & M&A and he always provides commercial and to-the-point advice. Furthermore, he has a strong understanding of how the client thinks and he always acts in the client’s interest. Finally, I would like to stress that he is very service minded and a very skilled negotiator”