Shearman & Sterling (London)

Mark Steenson

Shearman & Sterling (London)

Mark Steenson is a counsel in the Antitrust practice. Mark advises businesses on all aspects of European and UK antitrust law, including multi-jurisdictional merger control, market investigations, behavioural competition, State aid, litigation, and compliance. His work includes advising on cartel investigations by the European Commission, advising and coordinating multi-jurisdictional merger processes vis-a-vis a number of competition authorities, advising in respect of UK market investigations, and advising on State aid notifications to the European Commission. Mark has also worked on litigation matters in both the UK Competition Appeal Tribunal and the European Courts. Mark has also undertaken a secondment in the Phase 1 mergers division of the UK CMA.


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339 Bulletin

Elvira Aliende Rodriguez, Matthew Readings, James Webber, Jonathan Cheng, Sylvain Petit, Mark Steenson The EU Parliament and Council see the entry into force of their new Foreign Subsidies Regulation which protects the distortion of competition within the internal market


The EU Foreign Subsidies Regulation (FSR) entered into force on 12 January 2023. It represents a massive expansion in the European Commission’s power to investigate inward investment to the EU. This new regulation—the first of its kind in the world—attempts to assert control over subsidies (...)

James Webber, Mark Steenson, Margaret Ryan, Garreth Wong The EU Commission launches an in-depth investigation to assess whether the payment of an ICSID arbitral award in favour of Luxembourg and Dutch investors complies with EU rules on State aid (Antin)


Key Takeaways International investment protection is based on treaty obligations between sovereign states. State parties to those treaties enter into international obligations with one another for the protection of foreign investors and their investments—including the obligation to submit to (...)


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