Boris Bronfentrinker heads Willkie’s Antitrust & Competition Litigation practice in London. He is a solicitor advocate practicing in complex commercial litigation, with particular experience in competition litigation. He has represented clients, both as claimants and defendants, in leading and high profile cases in both the High Court of England & Wales and the Competition Appeal Tribunal, as well as coordinating competition litigation proceedings in other jurisdictions globally. Regularly acting for both claimants and defendants gives Boris a unique perspective and insight into the conduct of competition disputes from both sides. Boris is experienced in not only litigating cases to judgment but also resolving claims through alternative dispute resolution, such as mediation. Boris is recognised and highly ranked by Who’s Who Legal, Chambers UK, Chambers Europe, Chambers Global and The Legal 500, placing him among the best globally in the area of competition litigation.

Sarina is a Partner in the Dispute Resolution team in London and Co-Head of the firm’s Competition Litigation practice. She has a wealth of experience advising corporates and financial institutions on contentious and regulatory matters, particularly in relation to competition litigation and competition regulatory issues. She is ranked as a “Next Generation Partner” for competition litigation by The Legal 500.

Sarina has extensive experience in the conduct of complex, high-value, often funded competition litigation before the High Court of England and Wales, the Competition Appeal Tribunal, the Court of Appeal and the Supreme Court. She is currently acting for defendants in high-value proceedings relating to alleged antitrust infringements concerning interchange fees, ATM transactions, foreign exchange, car parts, emissions, power cables, certain pharmaceutical products and a tech company’s digital store.

Sarina has significant trial experience for competition damages claims, having conducted (amongst other things) a three and a half month first instance trial, a ten-day Court of Appeal hearing and a four-day Supreme Court hearing in the first wave of the interchange claims. She has also been involved in key cases establishing competition law in the UK, including the interchange cases (which are a leading authority on limitation, restriction and pass-on) and the pharmaceutical cases (which are leading authorities on excessive pricing). Sarina works in close collaboration with lawyers from the firm’s other market-leading practice areas, including Antitrust and Foreign Investment, Financial Regulation and Corporate in cross-office, multidisciplinary teams.

Sarina is passionate about social mobility, gender equality, and ending the stigma around mental health awareness.

Sarah is the Head of the Competition Group in the Innovation department. 

Sarah is a very experienced litigator, specialising in competition litigation, with particular experience acting for claimants in complex, high profile cases involving competition law based claims or defences.  Sarah has represented clients in leading competition damages claims in the English courts and in arbitrations.

Sarah also assists businesses that find themselves under investigation by Competition Regulators and businesses that are concerned about the way their affairs may have been conducted - attending Dawn Raids, advising on defence strategies, assisting with responses to information requests, applying for leniency from fines (where appropriate), assessing potential civil liabilities, and making submissions.

Sarah has been recognised as a recommended individual for Competition Litigation in Chambers & Partners and Legal 500, who have recognised her as "a great team leader in litigation matters."

Sarah is a member of the Law Society Competition Section, ABA Antitrust Law Section and Competition Law Association.