Sarah Long


Sarah Long is a competition lawyer with over 15 years’ experience spanning private practice, government policy, and in-house roles.  Her UK and EU practice covers a wide variety of sectors, and she has experience of advising on cartel enforcement, leniency applications, anti-competitive agreements, mergers, abuse of dominance and CMA market investigations.  Sarah has a particular focus on online markets and the digital economy, including telecoms (following a secondment to the GSMA) and is also an expert on distribution issues raised by e-commerce and has advised a number of leading consumer brands on their EU distribution strategies.

Sarah was listed in GCR’s 40 under 40 for 2020, which recognises the top young antitrust lawyers in the world, and one of 30 most notable competition practitioners in private practice by Women AT in 2017.   She is recognised as a Global Leader by Who’s Who Legal and as a Next Generation Partner by Legal 500.  Sarah joined Euclid in 2015, having worked for several leading competition law practices and at the OECD Competition Committee, where she worked alongside heads of competition law enforcement agencies including the CMA.

Sarah is also a passionate advocate for gender diversity, and frequently writes about the value that increased diversity can bring to organisations.  She was a key contributor to the initial research used by the OECD’s Gender Inclusive Competition Policy project.

Sarah was a co-editor of the Competition Law Journal, editor of the GCR Vertical Restraints Tool and a CEDR qualified Mediator.

Recent experience includes advising:

  • GSMA –  on all aspects of competition law including the new Open Gateway initiative, a project which represents a paradigm shift in the way the telecoms industry designs and delivers services in an API economy world.
  • Memoria in relation to the CMA’s market investigation into funeral directors and crematoria services
  • HBF in relation to the CMA’s consumer law investigation into the leasehold housing market
  • Leading consumer brands on designing and implementing their European distribution arrangements, including cutting edge selective distribution systems
  • B2B provider of online services in relation to an abuse of dominance claim
  • CityJet on its long-term wet lease arrangement with Aer Lingus, involving very rare strategic exit rationale
  • BidonThis as a third-party complainant resulting in the CMA’s investigation into ATG Media’s suspected concerted practices in the supply of auction services in the UK.
  • AXA in relation to the CMA’s market investigation into digital comparison tools and follow on investigation into a price comparison website (PCW) for its use of most favoured nation clauses in the home insurance market.
  • National Lighting Company in relation to the CMA’s domestic light fittings Resale Price Maintenance (RPM) investigation.
  • NHBC in relation to the CMA’s investigation into structural warranty service undertakings for new homes.
  • Statoil Fuel & Retail on its merger with Shell’s retail fuel network in Denmark before the European Commission.
  • EEX/Powernext as a third-party complainant in the acquisition of Trayport by ICE before the CMA.
  • HSBC on the European Commission’s Credit Default Swap (CDS) investigation.
  • DLG in relation to the CMA’s Private Motor Insurance Market Investigation.  

Includes matters handled at Euclid Law or prior to joining the firm


MA, Economics for Competition Law, King’s College London (2012)
LLB, Law, King’s College London (2002)


England & Wales
Belgium (B list)


English, French

Recent Publications and Speaking Engagements

  • Chair, Review of National Developments in Key Jurisdictions, Vertical Restraints and Distribution Conference, Brussels, 13 June 2023
  • Speaker, Fair play v. Fair competition – the application of competition law to professional sports, European Competition Law Association, Palma, 6 May 2023
  • Chair, General Counsel Roundtable, The Future of EU & UK Competition Regulation, London, 20 April 2023
  • Discussant, Law Society Competition Section roundtable on improving ethnic diversity in competition law, London, 17 March 2023
  • Presenter, Distribution Agreements in the e-commerce sector, EU-Asia Competition Summer School for officials, Brussels, June 2022
  • Chair, Mixed Distribution Systems, Vertical Restraints and Distribution Conference, Brussels, 22 June 2022
  • Speaker, The Future of Vertical Restraints Post Brexit, UK Association for European Law (UKAEL), 25 March 2021
  • Speaker, Cartels, Collusion and Corporate Governance: is gender the missing link?, Centre for European Law (CEL), 10 March 2021
  • Discussant, Cartels and Collusion: ‘Boys Club’ cultures in cartel cases, Workshop on Gender Inclusive Competition Policy, 25 February 2021
  • Lecturer, M&A and the Acquisition of Control in Digital Markets, European University Institute (EUI), 24 February 2021
  • Speaker, The new Subsidy and Procurement regimes post Brexit, CAS Compliance International, 24 February 2021
  • Speaker, Big Data and Competition Law, Horizontal/vertical dichotomy and dual distribution, Informa, 20 October 2020
  • Panel Chair, EU Competition Law Summer School, Article 102, KNect365, 4 August 2020
  • Panel Chair, Gender Inclusive Competition Policy Webinar, 29 July 2020
  • Speaker, Advanced EU Competition Law, Vertical Restraints and Distribution, 25 November 2019
  • Speaker, Data Pooling: Leaning where to draw the line, KNect365 Conference on Big Data & Competition Law, 15 October 2019
  • Author, Retail MFNs and Online Platforms under EU Competition Law: A Practical Primer, Competition Policy International – Antitrust Chronicle, 1 September 2019
  • Speaker, Dual Distribution: Challenges for Competition Law and RPM in the Digital World, Vertical Restraints and Distribution Conference, Informa, 26 June 2019
  • Author, Gender Inequality, Market Distortion and Consumer Welfare: A Call to Action for Competition Authorities, Journal of European Competition Law & Practice, 31 May 2019
  • Speaker, The use of interim measures in digital markets, Competition Section Annual Conference, 9 May 2019
  • Author, Interim Measures in the UK: Lessons from the Online Auction Services Case, International In-house Counsel Journal, Vol.12, No.46, Winter 2019, 1
  • Speaker, Gender, Competition Policy and reducing the GUDP (Grossly Undervalued Domestic Product), Chillin’ Competition Conference, Brussels, 20 November 2018
  • Author, Losing the ‘One-Stop-Shop’: The Real Cost of a Dual UK/EU Merger Process Post Brexit, Hot Topic Merger Control (3rdEdition) Legal 500, Autumn 2018
  • Author, Competition and Hong Kong’s Major Economic Sectors: Financial Services, Oliver Bretz and Sarah Long, Chapter 7.3 Financial Services in Quigley, C. & Rab, S. (eds) (2016) Hong Kong Competition Law, London, Hart Publishing

A selection of publications can be found here

Contact Details

+44 20 3816 3014


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