Expertise

With over twenty years’ experience in insurance law, Aaron acts for clients in relation to coverage of insured losses in diverse sectors including financial services, hospitality and retail, energy and construction, sports and entertainment. He is experienced in all commercial lines of business, including business interruption, directors and officers, professional liability, cyber, environmental risks, property and casualty. Aaron spent eight years practising in the Asia Pacific region and is particularly experienced at resolving international and cross-border claims, often via arbitration.

Aaron’s cases were selected by The Lawyer as the only insurance cases to feature in the publication’s annual Top 20 Cases list in both 2022 and 2023, and as a Top 10 Appeal in 2024. In June 2023 he was named by The Times as Lawyer of the Week in recognition of the successful verdict in London International Exhibition Centre v RSA & Ors [2023] EWHC 1481 (Comm).

Experience

Aaron has acted for:

• London’s ExCel centre as lead claimant in London International Exhibition Centre v RSA(the ‘ATP Test Case’), named as one of the Top 20 Cases of 2023 and Top 10 Appeals of 2024 in The Lawyer.
• A US drilling operator in relation to LCIA arbitration proceedings under a political risk policy issued by a consortium of Lloyd’s syndicates, arising from deprivation of assets in Russia following the commencement of hostilities with Ukraine
• The UK’s largest pub owner in Stonegate v MS Amlin, a £1.1bn claim that tested market-critical issues of aggregation, causation and treatment of government support, and selected as one of The Lawyer’s Top 20 Cases of 2022.
• An offshore property developer in relation to claims estimated at over £70m arising from alleged cladding defects.
• A Swiss private equity fund in relation to coverage of its claim under a buyer-side warranty and indemnity policy, following its failed acquisition of a UK trading company.
• An investment management company in relation to coverage of significant losses sustained as a result of a sophisticated cyber crime operation.

Recognition

Aaron is recognised as a leading insurance practitioner in all of the key directories.

• The Legal 500: “Aaron Le Marquer is the complete package: deep knowledge of both the law and the market, brilliant on strategy”;  “Aaron Le Marquer is genuinely outstanding. … A standout name in the market.”

• Chambers and Partners: “Aaron is the number one lawyer on the claimant side.” “One of the legends of insurance law”.

• Who’s Who Legal: Global Leader in Insurance and Reinsurance

Career

Aaron trained and practised with City and US firms in London before relocating to Asia in 2011, where he spent two years in-house as regional head of litigation for a global insurer in Singapore. He then returned to private practice to lead a dedicated insurance practice at Southeast Asia’s leading law firm, with offices in seven countries across the region.

After returning to London in 2019, Aaron led the products and environmental risks practice at a leading insurance boutique, before joining Stewarts to launch the firm’s Policyholder Disputes practice in 2022.

Accreditations and Memberships

• British Insurance Law Association
• London Business Interruption Association
• Law Society LGBTQ+ Solicitors Network
• American Bar Association

Publications and Media

Aaron has been widely published and interviewed on topical policyholder issues, most recently in relation to Covid-19 business interruption coverage. As well as featuring regularly in the insurance industry press, he has appeared in publications as diverse as the Financial Times, the Hollywood Reporter, the Sun, the Telegraph and the Times.

Personal

Having originally studied music at university, Aaron enjoys playing the piano when given an occasional break by his nine-year-old twins.