Mark Jones Jones Day


Mark Jones is a partner at Jones Day based in the firm’s London office. He has over 25 years of experience advising on complex and high-profile competition/antitrust issues. He has obtained competition clearances for M&A transactions and joint ventures and has represented clients in cartel, monopoly, and market investigations. Mark advises on UK, EU, and multijurisdictional matters. Sectors in which he has particular experience include financial institutions, technology, pharma, energy and infrastructure, entertainment and media, and retail and consumer. Mark has been described in legal directories as an "excellent technician and tactician" and a "fantastic competition lawyer." Mark also regularly advises on foreign direct investment regimes, the economic regulation of utilities, and subsidy control rules. Mark’s experience includes a secondment to the Office of Fair Trading, the predecessor to the Competition and Markets Authority (CMA). Prior to joining Jones Day in 2022, Mark’s recent cases include: CMA merger clearance for Kustomer, Inc. of its acquisition by Facebook; CMA and European Commission merger clearance for ASM Global, a joint venture between AEG and SMG, to establish a leading worldwide venue management and services company; representing OFGEM, the UK energy regulator, in its successful defense against appeals before the CMA by nine energy companies relating to its RIIO-2 price control decisions for the United Kingdom’s electricity and gas transmission and gas distribution networks; successfully defending a generics pharmaceutical company in a cartel investigation by the CMA in relation to the supply of two generic pharmaceutical products in the United Kingdom; and advising a major UK retail bank on the State aid aspects of the UK government’s COVID-related support loan schemes.

2020 Awards


Nominee, 2020 Antitrust Writing Awards: Business, Procedure

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