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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: Charlotte Gade Moberg
(+45) 88 88 85 25


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

Over the past many years, Joachim has been a “trusted advisor” for 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 responsible partner on the transaction and as head of SIRIUS law firm’s Corporate and M&A team.

Joachim is known for being an experienced and skilled negotiator always focusing on the right process through coordination and expectation-matching with all parties involved in a case in order to achieve a flexible project 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.


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

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


For the past many 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 Legal500 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”