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. —
Founded between 1900 and 2023
18 of 23 have a recorded year
190019251950197520002025
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Part of BDO International (166 countries, 1800 offices, 119,611 people, US$15 billion global revenue)
✦Most experience: 125+ years
126-year heritage (1900)
GFSCbdobusinesses of all sizesindividual clientssmeaccessible parking
Chartered accountancy and advisory firm with 48 qualified accountants and 21 trainees, specialising in audit, tax, and corporate finance in St Peter Port.
GFSCICAEWbusiness owning familiesinternational corporatesllpprivate capital investorspublic sector
The Guernsey branch of EY, a Big Four professional services firm offering assurance, consulting, tax, and strategy and transactions services from St Peter Port.
Grant Thornton International member firm established in 2016, specialising in AML, KYC, compliance, and corporate governance advisory services across Guernsey, Jersey, and Ireland.
Accountancy partnership established in 1952, offering accounting, taxation, audit, and payroll services, with trust and corporate services provided through group companies.
Provider of compliance and training services, specialising in the AML/CFT/CPF regulatory framework, established in 2010 with a team including Berri Trimmer and Emma Mauger who are STEP qualified.
Guernsey compliance consultancy, founded in 2023 by former GFSC senior managers, offering supervised roles, AML/CFT/CPF training, compliance audits, and corporate governance advisory.
Limited company established in 1987, providing investment oversight and monitoring services, and is a signatory of the UN Principles for Responsible Investment.
Data-informed business change consultant specialising in high-risk projects and complex transformation programmes, with nearly 30 years of delivery experience.