Fourteen firms — five global-network accountancies (PwC, EY, KPMG, BDO, Moore Stephens) alongside nine boutique compliance houses. Specialisations weight toward compliance advisory (11), risk management (10), and governance advisory (8). The oldest, BDO, traces to 1900 as G.N. Read, Son & Cocke; the newest, ONYX Solutions, opened 2024. —
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St Peter Port·Professional Service
Part of BDO International (166 countries, 1800 offices, 119,611 people, US$15 billion global revenue)
✦Most experience: 125+ years
126-year heritage (1900)
Chartered accountancy and advisory firm with 48 qualified accountants and 21 trainees, specialising in audit, tax, and corporate finance in St Peter Port.
St Peter Port·Professional Service·Est. 2021
Part of Square Clouds, TCS, Verify by Tiller, Abe Ltd
Guernsey AML and regulatory compliance consultancy, trading as Horsepool Group, offering outsourced compliance services and training.
St Peter Port·Professional Service·Est. 1987
Part of KPMG International Limited
Professional services partnership offering audit, tax, and advisory services across the Crown Dependencies.
St Peter Port·Professional Service
Part of Ernst & Young Global Limited
The Guernsey branch of EY, a Big Four professional services firm offering assurance, consulting, tax, and strategy and transactions services from St Peter Port.
St Peter Port·Professional Service
Part of PwC (PricewaterhouseCoopers International Limited)
✦Largest team: 501-1,000 (Channel Islands)
103-year heritage (1923)
Big Four professional services firm offering audit, tax, and advisory services across the Channel Islands.
St Peter Port·Service·Est. 2001
Part of Aspida Group Limited
Aspida Management Services Limited offers compliance, risk management, and corporate governance services as part of the Aspida Group.
St Peter Port·Professional Service
Guernsey-based compliance, risk management, and business advisory group serving clients across multiple offshore jurisdictions.
St Peter Port·Professional Service·Est. 2021
Financial services consultancy providing compliance, governance, and secretarial services across the Bailiwick of Guernsey.
St Peter Port·Professional Service·Est. 2016
Grant Thornton International member firm established in 2016, specialising in AML, KYC, compliance, and corporate governance advisory services across Guernsey, Jersey, and Ireland.
St Peter Port·Professional Service
✦119-year heritage (1907)
Independently owned audit, tax, and advisory firm in St Peter Port, part of the Moore Global network.
St Sampson·Professional Service·Est. 2024
Regulatory and compliance professional service, specialising in AI assistants for compliance, AML/KYC advisory, and independent compliance audits, established in 2024.
St Peter Port·Professional Service·Est. 2022
Independent compliance consultancy serving Guernsey's financial services firms and SMEs.
St Martin·Professional Service·Est. 2023
Guernsey compliance consultancy, founded in 2023 by former GFSC senior managers, offering supervised roles, AML/CFT/CPF training, compliance audits, and corporate governance advisory.
St Martin·Professional Service·Est. 2016
Regulatory compliance consultancy for Guernsey financial services licensees, founded in 2016 by former GFSC officer Rob Brown.
Vale·Organization·Est. 2021
Data-informed business change consultant specialising in high-risk projects and complex transformation programmes, with nearly 30 years of delivery experience.
St Peter Port·Professional Service·Est. 2007
Regulatory risk and compliance consultancy staffed by former GFSC regulators, serving regulated financial businesses since 2007.