• Advanz Pharma Corp & Ors v CMA [2025] EWCA Civ 578: Counsel for the CMA in the CAT and the Court of Appeal in successfully resisting appeals concerning the CMA’s excessive pricing decision in relation to liothyronine tablets. Appeared unled in CMA’s successful cross-appeal on penalty.
• Consumers’ Association v Qualcomm Inc: Counsel for Qualcomm in defending abuse of dominance collective claim for up to £480m. A 5-week trial took place in October/November 2025. Judgment is pending.
• Stellantis Auto SAS & Ors v Autoliv AB & Anor [2025] CAT 9: Counsel for ZF, successfully defending cartel damages claims for up to £770m in respect of steering wheels, airbags and seatbelts.
• Professor Carolyn Roberts v Yorkshire Water Services Ltd & Ors [2025] CAT 7: Counsel for Yorkshire Water in application for a collective proceedings order arising out of sewage spills.
• Vauxhall Motors Ltd & Ors v Denso Automotive UK Ltd & Ors [2025] EWHC 213 (Ch): Counsel for Sanden, successfully challenging jurisdiction to hear cartel damages claim relating to thermal system components.
• Phones 4U Ltd v EE Ltd & Ors [2025] EWCA Civ 869: Counsel for the CMA in its first ever intervention in an appeal relating to a private cartel damages action.
• Cérélia Group Holdings SAS & Anor v CMA [2025] Bus LR 94: Counsel for the CMA, successfully resisting an appeal against the CMA’s decision to prohibit the completed acquisition by Cérélia of Jus-Rol brand.
• Le Patourel v BT Group plc & Anor [2025] Bus LR 808: Counsel for the CMA, intervening in a collective claim for damages arising out of alleged excessive pricing of landline telephone services.
• Justin Gutmann v Vodafone Ltd: Counsel for Vodafone in application for a collective proceedings order in respect of alleged “loyalty penalties”.
• Alex Neill Class Representative Ltd v Sony Interactive Entertainment Europe Ltd & Ors: Counsel for the CMA, intervening in collective claim for damages in respect of terms of use of PlayStation Store.
• CMA v Another [2024] CAT 71: Counsel for the CMA, successfully applying for warrants to search premises of businesses suspected of bid rigging for the supply of constructive services to schools.
• Allergan plc & Ors v CMA [2024] EWCA Civ 1023: Counsel for the CMA in the CAT and the Court of Appeal, successfully appealing against a CAT decision that had set aside the CMA’s cartel decision in relation to hydrocortisone tablets.
• Pfizer Inc and Flynn Pharma Ltd v CMA [2024] CAT 65: Counsel for the CMA in the CAT and the Court of Appeal in relation to the CMA’s excessive pricing decision in relation to phenytoin capsules.
• Phillip Evans v Barclays Bank plc & Ors [2024] Bus LR 366: Counsel for Evans in applications for collective proceedings order arising out of FX cartel conduct, successfully appealing to the Court of Appeal on the opt-out v. opt-in issue. Appeal in the Supreme Court is pending.
• Sports Direct v Newcastle United Football Club Ltd [2024] 1 WLR 4324: Counsel for Sports Direct in an appeal against a refusal to grant a mandatory interim injunction against Newcastle United. Case settled.
• Keltbray Ltd v CMA [2024] CAT 79: Counsel for the CMA, co-leading successful defence of the CMA’s cartel decision in respect of the demolition industry.
• Advanz Pharma Corp & Ors v CMA [2024] CAT 36: Counsel for the CMA in appeals concerning an alleged market-sharing agreement in respect of prochlorperazine buccal tablets.
• Mark McLaren Class Representative Ltd v MOL (Europe Africa) Ltd & Ors [2023] Bus LR 318: Counsel for MOL, leading two juniors, in defending a 9-week trial of collective claim for up to £215m in cartel damages brought on behalf of 18.5m new car buyers in the UK. Judgment is pending.
• Euronet 360 Finance Ltd & Ors v Mastercard Inc & Ors: Counsel for Euronet in standalone competition litigation concerning fees relating to ATM transactions. Case settled.
• Microsoft Corp v CMA [2023] CAT 48: Counsel for the CMA in a judicial review of a decision prohibiting the merger of Microsoft and ActivisionBlizzard.
• Dr Gormsen v Meta Platforms Inc [2023] CAT 10: Counsel for Meta in resisting application for a collective proceedings order in respect of an alleged abuse of dominance.
• Veolia Environnement SA & Ors v MAN Truck and Bus SE & Ors: Counsel for MAN in the damages claims following on from the Trucks cartel decisions. Case settled.
• Gemalto Holding BV v Renesas Electronics Corp [2023] Ch 169: Counsel for Renesas in the High Court and before the Court of Appeal in successfully defending cartel damages claims as time-barred.
• Lexon (UK) Ltd v CMA [2021] CAT 5: Counsel for the CMA, successfully resisting an appeal against the CMA’s infringement decision in relation to nortriptyline tablets.
• Roland (UK) Ltd v CMA [2021] CAT 8: Counsel for the CMA, successfully resisting an appeal against the penalty imposed for resale price maintenance.
• Generics (UK) Ltd & Ors v CMA [2021] CAT 9: Counsel for the CMA in the CAT and the Court of Justice, successfully defending the appeals against the CMA’s pay-for-delay decision in paroxetine.
• iiyama v Samsung and Ors [2018] EWCA Civ 220: Counsel for LG in the High Court and before the Court of Appeal in jurisdiction challenge to cartel damages claims relating to cathode ray tubes.

• Case T-456/21 Bank of America Corp v Commission EU:C:2025:337: Counsel for Bank of America in an appeal against the Commission’s European Government Bonds cartel decision.
• Case T-66/25 Meta Platforms Inc v Commission: Counsel for Meta in an appeal concerning the alleged tying of Facebook Marketplace and Facebook.
• Cases C-496&497/23 P Meta Platforms Ireland Ltd v Commission: Counsel for Meta in appealing against Commission’s first ever RFI decisions using digital search terms.
• Case T-418/22 HSBC Continental Europe v Commission EU:T:2025:45: Counsel for HSBC in a case seeking damages in respect of the Commission’s refusal to pay interest on an annulled fine.
• Case T-1078/23 Meta Platforms Inc v Commission: Counsel for Meta in an appeal against the designation of Facebook Messenger and Facebook Marketplace under the Digital Markets Act.
• Case T-561/21 HSBC Holdings plc v Commission EU:T:2024:869: Counsel for HSBC in a case concerning the Euribor cartel.
• Case C-151/19 P Commission v Krka EU:C:2024:546: Counsel for the European Commission successfully arguing the General Court had been wrong to set aside the Commission’s decision in Servier/Krka.
• Case C-883/19 P HSBC Holdings plc v Commission EU:C:2023:11: Counsel for HSBC in an appeal concerning a cartel in respect of Euro interest rate derivatives.
• Case T-214/23 Greenpeace v Commission: Counsel for Greenpeace challenging the inclusion of nuclear energy and natural gas in the EU Taxonomy for sustainable finance.
• Case C-307/18 Generics (UK) Ltd & Ors v CMA EU:C:2020:52: Counsel for the CMA in the reference for a preliminary ruling concerning pay-for-delay in patent settlement agreements.
• Case T-684/14 Krka v Commission EU:T:2018:918: Counsel for the European Commission, defending an appeal against the Commission’s ‘pay for delay’ decision in Servier.
• Case T-438/14 Silec v Commission EU:T:2018:447: Counsel for the European Commission in an appeal concerning the high voltage power cables cartel.
• Cases C-164&165/15 P Commission v Aer Lingus EU:C:2016:990: Counsel for Aer Lingus in an appeal concerning the air travel tax.
• Case T-460/13 Ranbaxy v Commission EU:T:2016:453: Counsel for the Commission, successfully resisting an appeal against the Commission’s first ever ‘pay for delay’ decision in Lundbeck.
• Case T-260/13 Ryanair v Commission EU:T:2015:873: Counsel for the Commission in an appeal concerning Ryanair’s takeover of Aer Lingus.
• Case T-473/12 Aer Lingus v Commission EU:T:2015:78: Counsel for Aer Lingus, successfully challenging Commission’s State aid decision on differentiated air travel tax rates in Ireland.

• CNL Logistic Solutions Pte Ltd & Anor [2025] SGCAB 1: Counsel for Competition Commission of Singapore concerning its first ever appeal to the High Court of Singapore in relation to price fixing by warehouse operators at Keppel Distripark.
• Mastercard Inc and Visa Inc v Competition Commission of Mauritius (2024): Counsel for the Competition Commission in its first ever appeal to the Supreme Court of Mauritius.
• Bank of Ireland / KBC (2022): Counsel for the Irish Competition and Consumer Protection Commission during Phase 2 merger investigation of Bank of Ireland’s proposed acquisition of KBC’s loan assets.
• Application for a block exemption order by Hong Kong Liner Shipping Association (2022): Counsel for the Hong Kong Competition Commission.
• Private motor insurance (2022): Counsel for the Irish Competition and Consumer Protection Commission during investigation of suspected price signalling.
• Ticketmaster (2021): Counsel for the Irish Competition and Consumer Protection Commission during investigation of suspected abuse of dominance in respect of ticketing services in Ireland.

• Acted for claimants in the Chambre Arbitrale du Sport in relation to a high-profile sports-related dispute (settled).
• Acted for a claimant in an LCIA arbitration in relation to a commercial and competition law dispute in the global metals industry (settled).
• Acted for a respondent in an ICC arbitration in respect of a competition law dispute between a well-known sports team and a sportswear manufacturer (settled).

Books:

Whish and Bailey Competition Law (co-author 7th, 8th, 9th, 10th and 11th editions). Current: 11th edition, Oxford University Press, 2024.

Bellamy and Child European Union Competition Law (general editor of 7th and 8th editions). Contributor to 9th edition, Oxford University Press, 2026.

Education

• LLB and AKC, King’s College London (2000) (First Class)
• LLM, Harvard Law School (2001)
• Legal Practice Course (2002) (Distinction)

Professional career

• Professor of Practice in Competition Law, King's College London (2021 to date)
• Called to the Irish Bar (2018)
• International Competition Network, Non-Governmental Adviser (2017 to 2018)
• Standing Counsel to the CMA (2015 to date)
• Barrister, Brick Court Chambers (2012 to date)
• Called to the Bar: Middle Temple (2012)
• Solicitor Advocate (2010)
• Referendaire, Competition Appeal Tribunal (2007 to 2012)
• Solicitor, Linklaters (2003 to 2006)
• Called to the New York Bar (2003)
• Lecturer, King’s College London (2001 to date)

David is the only junior ranked in Competition Law as a “Star Individual” in Chambers and Partners 2026. He is also ranked in band 1 in the Legal 500 and as a “Thought Leader” in the Lexology Index for UK Bar. He won the Chambers & Partners Bar Awards as Competition Junior of the Year in 2020 and 2023.

"David Bailey is a highly sought-after junior who acts as standing counsel to the CMA and has noteworthy experience defending CMA decisions in appeals heard by the CAT. Bailey often acts on both the defendant and claimant sides of UK private enforcement actions, including high-profile collective actions. He is involved in many of the most high-profile competition cases." (Chambers & Partners 2026)

"His cross-examination is really forensic and tight. He's very tough but also really quite likeable; it's almost like he's picking pockets."  (Chambers & Partners 2026)

"He is the best junior barrister that we are currently working with, an absolute star. He is the man you want on big-ticket, high-stakes litigation."  (Chambers & Partners 2026)

"David combines knowledge of competition law with formidable technical abilities and a collaborative, commercial approach. He's someone you want on your side."  (Chambers & Partners 2026)

"He's just fantastic - a new category needs to be created for him. He wrote the book on competition."  (Chambers & Partners 2026)

"David has an encyclopedic knowledge of the law and applies that in a very focused and thoughtful way. His drafting is excellent: crisp, direct and very clear. David is very adept at identifying and articulating the strongest points in any case, and in identifying and neutralising strongest arguments on the others side." (Legal 500 2026)

"David Bailey is terrific. He is a rising star and a very impressive advocate."  (Chambers & Partners 2025)

"He has been extremely client-friendly." (Chambers & Partners 2025)

‘David’s knowledge of competition law is really second to none at the Bar. He is a superlative black letter lawyer and he is extremely experienced as a barrister in this area. He is very good at the procedural management of these claims and he is extremely responsive and collaborative with the solicitor team.’ (Legal 500 2025)

"David is an excellent advocate, with an extraordinary ability to conceptualise cases, unpick them and re-pack them. He is able to present extremely effectively and deal with all sorts of stressful situations with a calm approach and a lot of charm." (Chambers & Partners 2024)

"David is one of the leading competition and EU juniors. He advises on very complex technical issues with impressive speed and clarity. He also understands how the CAT thinks." (Chambers & Partners 2024)

"He has an encyclopedic knowledge of competition law." (Chambers & Partners 2024)

"A very cerebral junior with unparalleled knowledge of competition law." (Legal 500 2024)

"I really enjoy working with David. He is a subject matter expert and is forensic in his analysis. He's very quick-thinking and very personable and accessible." (Chambers & Partners 2023)

"David is just an encyclopedia of competition law." "You know if there is a technical point then he will grasp it with impressive speed." (Chambers & Partners 2023)

"David has an encyclopaedic knowledge of competition law and impressive attention to detail, always pragmatic and commercially minded in his approach. He is very responsive and easy to work with." (Legal 500 2023)

"You know if there is a technical point then he will grasp it with impressive speed." (Chambers & Partners 2022)

"David has an exceptional ability to analyse complex issues and provide advice which is both accessible to a wide (non-expert) audience and highly practical." (Legal 500 2022)

"He has an encyclopedic knowledge of competition law." (Chambers & Partners 2021)

"He's not only extremely bright, but wears it lightly in a very user-friendly way." (Chambers & Partners 2021)

"David is really top-draw and very experienced: a fountain of knowledge." (Chambers & Partners 2021)

"A great black letter lawyer and collegiate in approach." (Legal 500 2021)

"David Bailey stands out among peers for his exceptional knowledge of competition law and expertise in cartel claims." (Who's Who Legal - UK Bar: Competition 2020)

"Literally wrote the text book on competition law." "He is extremely knowledgeable on the case law and has good commercial judgement." "David is aware of the wider picture when giving advice and takes that into account when thinking about the case strategy." "He has an encyclopaedic knowledge of the law and displays a willingness to get involved in order to help us to understand the difficult legal issues that come up." (Chambers & Partners UK & Global 2020)

"He has a strong understanding of the CAT procedure." (The Legal 500 2020)

David Bailey is a "very bright" advocate who is "known to have one of the sharpest minds and some of the most encycolpaedic knowledge among competition juniors". (Who's Who Legal - Competition 2019)

David Bailey is one of the foremost competition juniors at the UK Bar and is recommended by peers who note his “incredible encyclopaedic knowledge of competition law and procedure”. (Who's Who Legal - UK Bar: Competition 2019)

"He has an encyclopaedic knowledge of UK and EU law, and is someone with really good advocacy skills whose style is engaging." (Chambers & Partners UK & Global 2019)

"Has an unsurpassed knowledge of competition law and is very able to apply it; responsive and enjoyable to work with." (The Legal 500 2019)

David Bailey is renowned for his experience in competition law, particularly investigations by the Competition and Markets Authority where his advice is very well regarded. He is recommended by peers as "clever, personable and approachable” and with “a tremendous depth of knowledge on the law”. (Who's Who Legal - UK Bar: Competition 2018)

"He has an encyclopaedic knowledge of competition law." "I have been really impressed by his court style." (Chambers & Partners 2018)

"David Bailey is regarded as “a future star”. His steeped learning in this area is highlighted by numerous respondents. One client is particularly effusive, “He is an automatic choice. You have a library in front of you with an extensive knowledge of case law. He grasps key issues rapidly, is shrewd in his approach and has a very accessible manner.”" (Who's Who Legal - UK Bar: Competition 2017)

“A number of Brick Court’s members are counted among the most eminent at the senior and junior levels. Kelyn Bacon QC, James Flynn QC and Mark Hoskins QC are star competition silks, with David Bailey and Daniel Piccinin earning similar recognition at the junior Bar.” (Who's Who Legal - UK Bar: Leading Sets 2017)

“David Bailey comes highly recommended for his “exceptional depth and breadth of knowledge of competition law”. Described as a “great orator”, he is “always very clear and is very involved in the wider policy debates”.” (Who's Who Legal - UK Bar: Competition - Future Leaders 2017: Barristers Analysis)

"He has an encyclopaedia of case law at his fingertips." (The Legal 500 2017)

"He has a really impressive legal mind, is extremely well organised, and is someone who always keeps to deadlines, no matter what the circumstances. He has a remarkable ability to synthesise and simplify things."  (Chambers & Partners 2017).

David Bailey comes highly recommended for his “exceptional depth and breadth of knowledge of competition law”. Described as a “great orator”, he is “always very clear and is very involved in the wider policy debates”. (Who's Who Legal - Competition 2017)

“He has an encyclopaedic knowledge of the case law; when you have him on board you know you are not missing out on the law side.” “He has first-class knowledge of CAT procedure” and is “knowledgeable, hard-working, personable and easy to use.” (Chambers & Partners 2016).

"A client favourite who has a strong focus on EU and competition law." (Chambers & Partners 2015).

"He is impressive and is gaining an excellent reputation at the Bar." (Chambers & Partners 2015).

“David Bailey is a “stand out” practitioner. With a wealth of expertise in the courts and in front of the European Commission, sources describe him as a “very resourceful litigator”.” (Who's Who Legal UK Bar 2015).