Dispute resolution
Stephenson Harwood boasts a ‘highly competent team of competition specialists’, with expertise in handling leading group claims, particularly competition and securities-related. ’Formidable practitioner’ Genevieve Quierin, who heads the team, is regarded as ‘one of the standout figures in claimant-side group litigation’. Trudy Feaster-Gee ’combines technical excellence with a sharp client focus’, while Tim Knight is skilled in s. 90 and s. 90A FSMA cases.
Legal 500 Editorial commentary
Profile
Work Department
Commercial Litigation
Position
Genevieve Quierin is a partner at Stephenson Harwood, where she represents a diverse range of corporate and individual clients across sectors such as banking, finance, private equity, luxury and media. Her practice is broad, covering everything from strategic pre-action advice to high-stakes multi-jurisdictional litigation. Clients appreciate her ability to distil complex issues into clear, actionable strategies, making her a sought-after advisor in both claimant and defendant roles.
Genevieve's expertise extends to competition private enforcement actions, many of which are group actions. She is known for her pragmatic approach, working closely with third-party litigation funders and insurers to ensure her clients' interests are robustly protected.
Clients value Genevieve's commitment to high standards of service and her ability to think commercially, setting her apart in the legal landscape.
Genevieve was recently named in The Lawyer Hot 100 2025 and featured in Global Competition Review’s - Women in Antitrust. She is ranked as a Leading individual in Legal 500 for Dispute Resolution, specifically in Banking Litigation: Investment and Retail, Commercial Litigation: Premium, and Group Litigation: Claimants. Additionally, Chambers UK ranks Genevieve for her expertise in Competition Law: Private Enforcement: Claimant, as well as Commercial and Corporate Litigation.
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Testimonials
Collated independently by Legal 500 research team.
‘Genevieve Quierin is a first-class litigator and one of the standout figures in claimant-side group litigation. She brings exceptional strategic judgment, deep legal expertise and a meticulous approach to complex, high-value disputes. Genevieve is particularly skilled at managing the many moving parts of large group actions, ensuring clients, funders and counsel are fully aligned throughout. Her clear, practical advice and proactive communication style make her both highly effective and deeply trusted by clients and colleagues alike. She is, without question, a leading force in this field.’
‘A highly competent team of competition specialists with a vast array of experience and a track record of securing excellent outcomes for their clients. Always on top of the detail and adept at managing teams that provide the coverage, but nimble enough to respond to changes in events.'
‘Genevieve Querin and Donna Newman are two outstanding partners who get on exceptionally well with clients and are brilliant at managing the team. Adam Polonsky and Trudy Feaster-Gea are also highly experienced in the competition field, having been heavily involved in securing successful outcomes for their clients against Visa and Mastercard. Chris Pettett and Marcus Watkinson are two excellent senior associates.’
‘Very responsive and on top of the details. Worked very closely with our team to deliver a very high-quality product.’
‘The Stephenson Harwood is exceptionally client-focused and relentlessly committed to securing successful outcomes in competition litigation. They excel in managing disclosure processes with precision - including witness statements and the identification of key documents - and are highly skilled at assembling top-tier counsel and expert teams tailored to each case. Internally, they bring together an optimal blend of competition and litigation specialists, ensuring that every facet of the case is expertly addressed.’
‘Trudy Feaster-Gee is an outstanding competition lawyer, highly insightful, and with deep expertise in competition litigation. She combines technical excellence with a sharp client focus and is consistently a pleasure to work with.
Key clients
- Marks and Spencer PLC
- bet365
- Intercontinental Hotel Group
- Asda Stores Limited
- Iceland Foods Limited
- Aldi Stores Ltd
- Wm Morrison Supermarkets Limited
- Ocado Retail Limited
- Co-operative Group Limited
- Kew Green Hotels Ltd
- WorldRemit Ltd
- Sony
Work highlights
Representing over 1,800 corporate claimants in group claims brought against Mastercard and Visa, totalling approximately £1.5bn. Clients include WorldRemit, Henderson & Jones, Lebara Mobile, 3, Bet365, IHG and numerous global hotel chains, high street and online retailers, restaurant chains, travel companies, arts and entertainment companies, airlines, ticketing companies and others.
Acting for seven UK supermarket groups that account for 45% of the UK grocery market (Asda, Aldi, Co-op, Iceland, M&S, Morrisons and Ocado), in their claims for damages against seven leading farmed Atlantic salmon producers.
Representing Hillside (Shared Services) Limited and others (whose claims were issued in 2017) in interchange reimbursement claims against Visa and MasterCard in two separate sets of proceedings.