Formed in 2023, Austen Hays acts on group litigation related to data breaches and professional negligence claims. Practice head Chaya Hanoomanjee brings experience in class actions in the automotive sector.

Jointly led by Pete Gallagher and Jamie Patton, Johnson Law Group acts on automotive group actions and has greatly expanded its practice with the addition of five partners in September and December of 2025.

Regarded as ‘a market leader in claimant group litigation’, Hausfeld & Co LLP regularly acts for class representatives in opt-out competition class actions, particularly in relation to abuse of dominance claims. With a broader network of offices across Europe, the firm acts in disputes across various jurisdictions, particularly on mandates in the tech, automotive, finance and aviation sectors. Praised for her ‘razor-sharp legal brain’, practice head Nicola Boyle specialises in damages recovery and collective redress matters. Lesley Hannah focuses on claims in the tech sphere, with experience representing claimants against major tech giants. Anthony Maton is an expert in private enforcement and acts in appellate-level litigation. Scott Campbell advises on cartel damages claims in the automotive and tech sectors. Belinda Hollway, who advises classes of businesses in damages litigation, joined the team from Scott + Scott in June 2025.

‘An excellent team of very capable and highly collaborative lawyers’, KP Law regularly acts in collective proceedings involving classes of consumers and employees numbering in the tens of thousands. The firm covers a wide range of sector disputes, including automotive, pharmaceutical, financial services and retail. Practice head Andrew Nugent Smith focuses on consumer claims, product liability and equal pay. Tom Longstaff is experienced in consumer safety and environmental group actions, while Emma Birch advises on sex discrimination claims and employment disputes. Carter Young is involved in the ongoing trend of automotive emissions class actions and equal pay disputes. In September 2025, Hannah Sharp and Ian Bailey joined the team from Rosling King and Maurice Blackburn Lawyers respectively.

The ‘absolutely first-class’ team at Leigh Day specialises in advising claimants in a wide range of class actions, from employment and consumer cases to environmental claims. The firm acts for classes of claimants based across the globe, including a number of Brazilian communities in contamination claims. These groups often comprise tens of thousands of individuals and bring claims arising from issues in the retail, automotive and oil and gas sectors. The ‘calm and persuasive’ Martyn Day represents claimants in cases where parent company liability and jurisdiction are in dispute. Richard Meeran advises on health & safety and environmental claims, while Sapna Malik is an expert in human rights litigation. Experienced before the Supreme Court, Dan Leader focuses on environmental and human rights law litigation.

‘Exceptionally knowledgeable and technically strong’, Milberg London is active in large-scale class actions within the automotive sectors, representing classes of over 100,000 consumers. The firm notably advises on emissions claims against leading vehicle manufacturers and in defect disputes, and more broadly, the firm acts in the tech and digital markets sectors. James Oldnall, an expert in financial markets and data protection, manages the practice alongside Edward Cardington, who focuses on emissions litigation. Natasha Pearman, ‘a superb strategist and a strong team player’, regularly acts on opt-out collective actions. Polly Blenkin advises on group litigation that raises issues of fraud. Zena Prodromou focuses on opt-out tech claims, advising on the certification stage. Oliver Lawson adds to the firm’s strength in emissions litigation.

‘A firm with quality at all levels’, Stewarts Law LLP advises on group litigation in the financial services sector, brought under s. 90 FSMA. The firm is also experienced in abuse of dominance actions and professional negligence claims against tech companies, financial institutions and investment banks. Kate Pollock acts in class actions comprised of businesses regarding cartel and abuse of dominance matters. David Pickstone is an expert in group litigation regarding tax and EU law. Keith Thomas focuses on securities litigation, with experience advising sovereign wealth funds, life insurers and pensions funds. Acting in Court of Appeal proceedings, Aaron Le Marquer represents policyholders in insurance class actions. Inge Forster is involved in consumer class actions in the automotive and digital markets sectors.

Specialising in claimant-side securities litigation, Fox Williams LLP acts against leading trading, energy and retail companies on a range of cases, including stock-drop claims. The firm is also experienced at handling claims relating to market disclosures, governance failures and financial misconduct. Practice head Andrew Hill advises institutional investors in overstatement and bribery cases. ‘Extremely strong on the details and very commercial’, Matthew Reach adds to the firm’s securities strength. Anisha Patel focuses on corporate accountability and investor stewardship issues in securities litigation. Conrad Palejowski excels in civil fraud proceedings, including in cases raising allegations of deceit and breach of duty.

Experienced in contingency fee cases and involving non-traditional funders, Harcus Parker Limited is a boutique collective action firm that advises on financial services, consumer, competition and employment claims. The firm is regularly involved in cases heard before the Court of Appeal and the Court of Justice of the European Union. ‘Unrivalled in his strategic knowledge’, Damon Parker heads the practice, focusing on financial services and consumer claims. Adam Zoubir  specialises in claims within the education sector brought on behalf of students, while Thomas Ross acts on competition class actions. Jeremy Robinson is experienced in opt-in proceedings within the financial services sector.

Praised by clients for its ‘outstanding partners’, Mishcon de Reya LLP is active in a wide range of group actions, including opt-in and opt-out, against large international companies. The firm advises on data breaches, financial services, environmental and consumer litigation along the full life cycle of a case. Regularly appearing before the CAT, members of the team are experienced in competition proceedings concerning cartel claims. The practice is led by Richard Leedham, who specialises in insurance litigation, and Sarah Houghton, a competition lawyer who advises consumers and companies in group actions. Ben Lasserson focuses on private enforcement litigation across Europe. Shazia Yamin advises on product liability litigation in the automotive industry.

‘An extraordinarily capable team’, Pogust Goodhead advises on environmental litigation cases across the world, with particular strength in cases involving Brazilian law. The team is also active in consumer, data breach and human rights litigation. Alicia Alinia advises on product liability litigation. Anna Varga advises on consumer actions within the automotive industry. Tom Ainsworth is experienced representing clients, which includes large classes of claimants, in appellate-level litigation.

Praised for its ability ‘to handle complex large-scale litigation’, Edwin Coe LLP covers a broad range of class action litigation, advising on cartel and consumer credit claims as well as mass torts. The firm is also experienced in financial services sector claims and shareholder claims. Alex Shirtcliff, who leads the team, is recommended for his expertise in cryptocurrency matters. ‘A great sounding board’, David Greene regularly represents large classes of individuals against companies in competition cases, appearing before the CAT and the High Court. With experience in judicial reviews, Zahira Hussain advises on financial services litigation.

With ‘excellent strength in depth’, Hugh James is experienced in obtaining group litigation orders, from industrial disease and product liability claims to consumer and environmental claims. The firm also acts in opt-out competition class actions concerning abuse of dominance and anti-competitive behaviour. The team is jointly headed by Neil Stockdale, who advises on employment and environmental actions, and Mark Harvey, who focuses on product liability. Gwen Morgan-Evans is experienced before the Court of Appeal, acting in environmental professional negligence and personal injury claims.

Fielding a team of ‘outstanding and immensely hard-working partners and associates’, Irwin Mitchell regularly advises on group claims concerning medical negligence and travel illness claims. The firm also advises clients from across the globe on product liability, employment and professional negligence claims. Sallie Booth is experienced in claims involving foreign jurisdictions and in claims within the healthcare sector. Tim Annett is an expert in medical negligence, product liability and clinical trials. Jatinder Paul advises personal injury claimants in cases before the Supreme Court.

Stephenson Harwood advises clients across the group litigation space, specialising in competition, securities, consumer and data protection claims. The firm’s recent work includes opt-out collective actions in the tech and digital markets space. Practice head Genevieve Quierin specialises in private enforcement actions before the CAT. Tim Knight acts for clients in securities claims brought under s. 90 and s. 90A of the FSMA. Adam Polonsky is particularly noted for his work on the MasterCard compensation claim.

Fladgate LLP represents companies and individuals across group litigation, including stand-alone and follow-on proceedings. The firm has particular expertise in securities litigation under s. 90 and s. 90A of the FSMA. The team is led by John Evans, who acts on securities and environmental cases. Garbhan Shanks focuses on insurance and reinsurance, while Leigh Callaway specialises cyber and post-M&A disputes. Nadia Osbourne regularly acts on cross-border group actions as well as CAT litigation.

Bringing ‘a real level of strategic thinking and pragmatism’, Humphries Kerstetter LLP acts in group competition litigation for a range of classes concerning anti-competitive practices. The firm also advises on data breach disputes, as well as litigation involving the financial services sector. Practice head Toby Starr is noted for his track record in financial mis-selling and data privacy claims. Harriet Bush acts in shareholder disputes and class actions concerning financial services. Sinead O’Brien advises on tech and insurance disputes before the CAT and High Court.

Praised for its ‘depth and breadth of experience’, Penningtons Manches Cooper LLP regularly advises on insurance-related group actions. The firm is experienced at all levels of litigation, acting for clients before the Court of Appeal and Supreme Court. The team is led by three lawyers: Kamran Rehman, who heads the wider commercial dispute resolution department; David Niven, who specialises in group professional negligence claims; and David O’Brien, an adviser on financial mis-selling, securities and insurance claims. Michael Brown focuses on banking litigation.