Joachim is an Associate in the Competition team. He advises clients on a range of competition law matters, including merger control, foreign direct investment, regulatory compliance and investigations. 

Joachim has in-depth experience of UK and Polish merger control proceedings and advises clients on competition regulations and merger control requirements. His experience includes advising on merger control investigations in front of the CMA and the European Commission, carrying out risk assessments, preparing CMA briefing papers, drafting a Polish merger notification, handling multi-jurisdictional merger control filings, and advising on the CMA's market study into online platforms and digital advertising.

As a regular advisor on the UK National Security and Investment regime, Joachim has helped a number of clients secure unconditional clearance decisions. Joachim has a strong interest in tech regulation, digital transformation and the new regulatory landscape affecting the operation of online platforms. He also has a keen interest in the application of competition law in professional sport and is a member of Osborne Clarke's Sport Group.

Joachim joined Osborne Clarke LLP in March 2021 from a leading international law firm's London office. Prior to that Joachim graduated with LL.B. from King's College London, following which he completed his LL.M. at the University of Pennsylvania Law School where he has simultaneously studied at the Wharton Business School. Joachim has also successfully completed a postgraduate degree in Polish and EU Competition law at the Institute of Law Studies of the Polish Academy of Sciences (INP PAN).

Joachim is a co-author of a book on the legal regulations governing the use of artificial intelligence - the UK chapter of the Law Over Borders Comparative Guide on Artificial Intelligence.

Joachim is a member of the Competition Section of the Law Society of England and Wales.


"Joachim Piotrowski is attentive to detail, and able to provide convincing reasoning, justifying proposed approach or solutions."

EU and Competition, The Legal 500
RM plc

Advising on the sale of School Management Information System (MIS) business – known as RM Integris and RM Finance – to The Key Group. Unconditional CMA Phase 1 merger clearance was obtained.


Advising BioNTech in respect of worldwide merger control aspects arising from its £562m acquisition of InstaDeep Ltd.

Octopus Energy

Advising Octopus Energy on its investment into The Kensa Group and securing an unconditional Phase 1 merger clearance from the European Commission.


Advising Grifols on the competition law and merger control aspects of its EUR 1.1 billion acquisition of Biotest AG.


Advised Nexeon on its significant US$80 million funding to scale up production of step change battery materials.

Mill Point Capital

Advising Mill Point Capital on the merger control aspects of its sale of Kemp Technologies to Progress Software for US$258 million.