Three hundred and three professional-services firms across sixteen sub-sectors. The biggest cohorts: 60 in IT (hosting, networks, software, and cyber at ten apiece), 38 legal with 34 in St Peter Port, 36 accountants, and 33 consultants weighted to regulatory advisory. Mourant's roots run to 1842; the newest firm opened 2026. —
260 organisations are counted with Professional Services as their primary sector — 7% of everything with a sector on record, and the 6th largest of 16. An estimated 80% of the sector is counted, measured against an independent listing rather than assumed.
The 303 listed on this page and the 260 counted above are different claims, not a discrepancy: this page lists everyone who works in Professional Services; the census counts those whose primary sector it is.
A capability on record for 203 of 260 Professional Services organisations (78%)
| By group | Organisations | Share |
|---|---|---|
| Business consulting & advisory | 80 | 39% |
| Accountancy & tax | 63 | 31% |
| Corporate, fiduciary & funds | 49 | 24% |
| Estate agency & property | 45 | 22% |
| IT & technology | 43 | 21% |
| Legal | 43 | 21% |
| Risk, regulatory & compliance | 39 | 19% |
| Architecture, surveying & engineering | 36 | 18% |
| Recruitment, training & coaching | 35 | 17% |
| Marketing & design | 24 | 12% |
| Specialist services | 17 | 8% |
| General building & structural | 11 | 5% |
| Charity, community & membership | 4 | 2% |
| Electrical | 2 | 1% |
| Plumbing, heating & ventilation | 1 | 0% |
| Specialist trades | 1 | 0% |
Capabilities as published by each organisation and resolved to the graph; a business with no capability claim is not necessarily a business that does none of these things.
143 of the 203 with a capability on record span two or more of these groups (70%). Two capabilities inside one group are one trade, not two, which is why this counts groups rather than nodes.
Sixty of Guernsey's 305 professional-services firms work in IT — hosting (10), networks (10), software (10), cyber (8).
Thirty-eight firms, thirty-four in St Peter Port — Mourant's roots to 1842, Carey Olsen 1898, the newest 2024.
Thirty-six firms — half in St Peter Port, sixteen doing audit work, anchored by BDO (trading since 1900) at one end.
Thirty-three firms — Big Four and BDO alongside independent compliance boutiques, weighted to regulatory and risk advisory work.
Twenty-nine practices — 16 in building surveying, 13 in architectural design, and a six-firm quantity-surveying cluster.
Twenty-nine agencies — web design (13) and digital marketing (12) lead, with branding and SEO clusters of seven apiece.
Twenty-seven firms — seventeen in St Peter Port, weighted toward compliance work with a smaller tax-advisory cohort of thirteen.
Twenty-one agencies — the oldest trading since 1879, the newest opened 2025; seventeen are limited companies.
Twenty agencies — 17 in St Peter Port — weighted to finance and fiduciary placements, with Blink (1970) the island's first.
Fifteen training and coaching providers — the GTA's TGI Business School anchors a cohort weighted toward compliance, HR and finance tuition.
Seven consultancies — engineering, marine geophysics, ecology, buildings — two are commercial arms of island wildlife charities.
Six funeral directors — five across Guernsey parishes, one on Alderney. Oldest founded 1875 (Beckfords); newest 2016 (Vaudins).
Five firms in St Peter Port — EasyCo's boxed package, JTC's fund arm, Krys Global asset-recovery, and two secretarial specialists.
Five H&S specialists — the oldest Normandie since 1995, the newest SafetyNet since 2023; four limited companies, one charity.
Tagged in Professional Services but not in one of the sectors above.